【威学教育】王鑫托福阅读TPO5-2阅读文本

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【威学教育】王鑫托福阅读TPO24-3阅读文本

【王鑫托福阅读】托福TPO 全集之TPO24-3TPO 24TPO24-3 Moving into Pueblos1. The word traumatic meaning to A Essential B highly stressful C highly unusual D unwise2. The word intense in the passage is closest in meaning to A strongB questionableC obviousD deliberate3. According to paragraph 1, before the thirteenth century the people of southwestern North America lived in households that A shared daily chores with neighboring households B occupied dwellings that were built into the sides of cliffsC were largely free to conduct their lives as they pleasedD enforced mon standards of behavior and cooperative conduct within their munitiesIn the Mesa Verde area of the ancient North American Southwest, living patterns changed in the thirteenth century, with large numbers of people moving into large munal dwellings called pueblos, often constructed at the edges of canyons, especially on the sides of cliffs. Abandoning small extended-family households to move into these large pueblos with dozens if not hundreds of other people wasprobably traumatic. Few of the cultural traditions and rules that today allow us to deal with dense populations existed for these people accustomedto household autonomy and the ability to move around the landscape almost at will. And besides the awkwardness of having to share walls with neighbors, living in aggregated pueblos introduced other problems. For people in cliff dwellings, hauling water, wood, and food to their homes was a major chore. The stress on local resources, especially in the firewood needed for daily cooking and warmth, was particularly intense, and conditions in aggregated pueblos were not very hygienic.4. Which of the following best indicates the organization of paragraph 1?A It presents the conditions that caused a change in a population' s living patterns and then explains why those conditions got worse.B It identifies certain present-day cultural traditions and rules and then traces them to their roots in the thirteenth century.C It casts doubt on one explanation of the move to pueblos and then introduces an alternative explanation that the passage will defend.D It describes a major change in a population's living patterns and then presents a number of problems that resulted from that change.5. According to paragraph 3, which of the following Given all the disadvantages of living in aggregated was one of the consequences of increasing population towns, why did people in the thirteenth century move densities?A People were increasingly crowded into into these closely packed quarters? For transitions of collections of large housing units. such suddenness, archaeologists consider either pullB People stopped planting crops that have relatively factors (benefits that drew families together) or push low yields. factors (some external threat or crisis that forcedC Domestic buildings were pushed beyond the canyonpeople to aggregate). In this case, push explanationslimits. dominate.D The natural landscape was destroyed.6. Which of the sentences below best expresses the♦Population growth is considered a particularlyessential information in the highlighted sentence ininfluential push. After several generations ofthe passage?Incorrect choices change the meaning inpopulation growth, people packed the landscape inimportant ways or leave out essential information.densities so high that munal pueblos may haveA Some scholars even claim that the intensification ofbeen a necessary oute. Around Sand Canyon, forfarmers' various efforts during the 1200s led to furtherexample, populations grew from 5 -12 people perpopulation growth and the consequent need for more arable land.square kilometer in the tenth century to as many as 30 -50 by the 1200s. As densities increased, domesticB Evidence of intensifying agriculture in the 1200sarchitecture became larger, culminating in crowdedindicates a need to feed a larger population and so pueblos. Some scholars expand on this idea byextends the argument that a growing population wasemphasizing a corresponding need for arable land tothe cause of the move to pueblos.feed growing numbers of people: construction oiC During the 1200s, farmers met the demand for moresmall dams, reservoirs, terraces, and field housesarable land, but they also succeeded in cultivatingindicates that farmers were intensifying their effortsexisting land more intensively with the help ofduring the 1200s. petition for good farmland mayagricultural construction projects.also have prompted people to bond together to assertD Some scholars feel strongly that the construction ofrights over the best fields.small dams, reservoirs, terraces, and field houses in the thirteenth century is independent evidence for growth in the number of people.7. The word transition in the passage is closest in meaning toA changeB climateC declineD problem8. Why does the author state that "Growing food at these elevations is always difficult because of the short growing season"?A To explain why the higher elevations were always relatively sparsely populatedB To suggest that any worsening of conditions would have significant consequencesC To emphasize how resourceful the people growing food at these elevations wereD To argue that farming was not the primary source of food at high elevationsAnother important push was the onset of the Little Ice Age, a climatic phenomenon that led to cooler temperatures in the Northern Hemisphere. Although the height of the Little Ice Age was still around the corner, some evidence suggests that temperatures were falling during the thirteenth century. The environmental changes associated withthis transition are not fully understood, but people living closest to the San Juan Mountains, to the northeast of Mesa Verde, were affected first. Growing food at these elevations is always difficult because of the short growing season. As the Little Ice Age progressed, farmers probably moved their fields to lower elevations, infringing on the lands of other farmers and pushing people together, thus contributing to the aggregations. Archaeologists identify a corresponding shift in populations toward the south and west toward Mesa Verde and away from higher elevations.9. the Little Ice發According to paragraph 4, what did farmers do in response to falling temperatures during t卜 Age?A Moved to areas away from Mesa VerdeB Moved closer to the northeastern part of Mesa VerdeC Began to cultivate crops adapted to a short growing seasonD Gave up the cultivation of the highest-lying lands10. According to paragraph 5, major ceremonial events we「e occasions forA leaders to persuade people from the countryside to move into a puebloB farmers to collect information about where crops could be reliably grownC people to develop better techniques for producing pottery and craftsD people in the early Puebloan era to share farm and craft products11. According to paragraph 5, which of the following was a reason people in the Mesa Verde area formed munal villages in the thirteenth century?A The climate in the Mesa Verde area became more locally diverse.B Individuals were no longer interested in exchanging pottery and food.C Cooperation between people became more important for survival.D Bad years of farming began to occur more frequently.12. Paragraph 5 supports which of the following statements about cooperation among the people in the Mesa Verde area from the eleventh through the thirteenth century? A Cooperation allowed many households to give up farming and to specialize in making pottery and crafts.B People went from exchanging food and crafts they individually produced to sharing in a cooperative effort to produce as much food as possible.C Overtime there was less cooperation as farmers peted with each other for trade with distant areas.D Individuals stopped cooperating with each other because they did not have enough food for themselves.In the face of all these pushes, people in the Mesa Verde area had yet another reason to move into munal villages: the need for greater cooperation.Sharing and cooperation were almost certainly part of early Puebloan life, even for people living in largely independent single-household residences scattered across the landscape. Archaeologists find that even the most isolated residences during the eleventh and twelfth centuries obtained some pottery, and probably food, from some distance away, while major ceremonial events were opportunities for sharing food and crafts. Scholars believe that this cooperation allowed people to contend with a patchy environment in which precipitation and other resources varied across the landscape: if you produce a lot of food one year, you might trade it for pottery made by a distant ally who is having difficulty with crops—and the next year, the flow of goods might go in the opposite direction. But all of this appears to have changed thirteenth century. Although the climate remained as unpredictable as ever between one year and the next, it became much less locally diverse. In a bad year for farming, everyone was equally affected. No longer was it helpful to share widely. Instead, the most sensible thing would be for neighbors to bine efforts to produce as much food as possible, and thus aggregated towns were a sensible arrangement.In the Mesa Verde area of the ancient North American Southwest, living patterns changed in the thirteenth century, with large numbers of people moving into large munal dwellings called pueblos, often constructed at the edges of canyons, especially on the sides of cliffs. Abandoning small extended-family households to move into these large pueblos with dozens if not hundreds of other people was probably traumatic. Few of the culturaltraditions and rules that today allow us to deal with dense populations existed for these people accustomed tohousehold autonomy and the ability to move around the landscape almostat will. | And besides theawkwardness of having to share walls with neighbors, living in aggregated1 pueblos introduced otherproblems. | For people in cliff dwellings, hauling water, wood, and food totheir homes was a majorchore. | The stress on local resources, especially in the firewood needed for daily cooking and warmth, wasparticularly intense, and conditions in aggregated pueblos were not very hygienic. |13. Look at the four squares [| ] that indicate where the following sentence could be added to the passage. Where would the sentence best fit? Click on a square to add the sentence to the passage.Performing everyday household tasks required more effort.14. Directions: An introductory sentence for a brief summary of the passage is provided below. plete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage.This question is worth 2 points. In the thirteenth century, the people in the Mesa Verde area went from living in scattered independent households to living in large pueblos. A. Because the thirteenth-century inhabitants of the Mesa Verde area did not have the cultural expectations of today's city dwellers, they easily adapted to munal life.A. Even though living in pueblos had disadvantages, the population of the area had grown so large that there may have been no other arrangement that would have met its needs.B. From the eleventh century onward, farmers began to increase food production on existing farmland and started bringing more land under cultivation.C. A development that contributed to increasing population densities was a cooling climate that led many people to leave the coldest areas and crowd into climatically more favorable areas.D. The primary reason for moving to pueblos was the social benefits associated with munal life.E. People were brought together by the need to produce food cooperatively, as the use of food surpluses in one place to relieve shortages in another ended due to a change in climate.。

【威学教育王鑫】整理出品托福TPO6-2阅读文本

【王鑫托福阅读】托福TPO6-2阅读文本TPO6TPO6-2 William Smith1. The word “rudimentary” in the passage is closest in meaning toA. thoroughB. strictC. basicD. occasional2. According to paragraph 1, which of the following statements about William Smith is NOT true?A. Smith learned surveying by reading and by apprenticing for a local surveyor.B. Smith’ s family lived in a small English town and possessed little wealth.C. Smith learned about fossils from books he borrowed from his uncle.D. Smith eventually left his village to work on the excavation of an English canal.3. Which of the following can be inferred from paragraph 2 about canal building?A. Canals were built primarily in the south of England rather than in other regions.B. Canal building decreased after the steam locomotive was invented.C. Canal building made it difficult to study rock strata which often became damaged in the process.D. Canal builders hired surveyors like Smith to examine exposed rock strata.4. According to paragraph2, which of the following is true of the map published by William Smith?A. It indicates the locations of England's major canals.B. It became most valuable when the steam locomotive made rail travel possible.C. The data for the map were collected during Smith ’ s work on canals.D. It is no longer regarded as a geological masterpiece.In 1769 in a little town in Oxfordshire, England, a child with the very ordinary name of William Smith was born into the poor family of a village blacksmith. He received rudimentary village schooling, but mostly he roamed his uncle's farm collecting the fossils that were so abundant in the rocks of the Cotswold hills. When he grew older, William Smith taught himself surveying from books he bought with his small savings, and at the age of eighteen he was apprenticed to a surveyor of the local parish. He then proceeded to teach himself geology, and when he was twenty-four, he went to work for the company that was excavating the Somerset Coal Canal in the south of England.This was before the steam locomotive, and canal building was at its height. The companies building the canals to transport coal needed surveyors to help them find the coal deposits worth mining as well as to determine the best courses for the canals. This job gave Smith an opportunity to study the fresh rock outcrops created by the newly dug canal. He later worked on similar jobs across the length and breadth of England, all the while studying the newly revealed strata and collecting all the fossils he could find. Smith used mail coaches to travel as much as 10,000 miles per year. In 1815 he published the first modern geological map, "A Map of the Strata of England and Wales witha Part of Scotland,” a map so meticulously researched that it can still be used today.5. The word “meticulously” in the passage is closest in meaning toA.carefullyB. quicklyC. frequentlyD. obviously6. Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information.A. The discovery of regional differences in the sequences of rocks led geologists to believe that rock types could someday become reliable time markers.B. Careful analysis of strata revealed that rocks cannot establish geological time because the pattern of rock layers varies from place to place.C. Smith's catalogs of rock strata indicated that the sequences of rocks are different from place to place and from region to region.D. Because people did not catalog regional differences in sequences of rocks, it was believed that rocks could never be reliable time markers.This was before the steam locomotive, and canal building was at its height. The companies building the canals to transport coal needed surveyors to help them find the coal deposits worth mining as well as to determine the best courses for the canals. This job gave Smith an opportunity to study the fresh rock outcrops created by the newly dug canal. He later worked on similar jobs across the length and breadth of England, all the while studying the newly revealed strata and collecting all the fossils he could find. Smith used mail coaches to travel as much as 10,000 miles per year. In 1815 he published the first modern geological map, “A Map of the Strata of England and Wales witha Part of Scotland, ” a map so meticulously researched that it can s till be used today.In 1831 when Smith was finally recognized by the Geological Society of London as the “father of English geology,” it was not only for his maps but also for something even more important. Ever since people had begun to catalog the strata in particular outcrops, there had been the hope that these could somehow be used to calculate geological time. But as more and more accumulations of strata were cataloged in more and more places, it became clear that the sequences of rocks sometimes differed from region to region and that no rock type was ever going to become a reliable time marker throughout the world. Even without the problem of regional differences, rocks present a difficulty as unique time markers. Quartz is quartz—a silicon ion surrounded by four oxygen ions —there ’ s no difference at all betweentwo-million-year-old Pleistocene quartz and Cambrian quartz created over 500 million years ago.7. Why does the author use the phrase “Quartz is quartz” ?A. To describe how the differences between Pleistocene and Cambrian quartz reveal information about dating rocksB. To point out that the chemical composition of quartz makes it more difficult to date than other rocksC. To provide an example of how regional differences in rock sequences can make a particular rock difficult to dateD. To explain that rocks are difficult to use for dating because their chemical compositions always remain the same over time8. According to paragraph 4, it was difficult for Smith to distinguish rock strata becauseA. the rocks from different strata closely resembled each otherB. he was often unable to find fossils in the younger rock strataC. their similarity to each other made it difficult for him to distinguish one rock type from anotherD. the type of rock between two consistent strata was always the same9. The word “endured” in the passage is closest in meaning toA. vanishedB. developedC. variedD. survivedAs he collected fossils from strata throughout England, Smith began to see that the fossils told a different story from the rocks. Particularly in the younger strata, the rocks were often so similar that he had trouble distinguishing the strata, but he never had trouble telling the fossils apart. While rock between two consistent strata might in one place be shale and in another sandstone, the fossils in that shale or sandstone were always the same. Some fossils endured through so many millions of years that they appear in many strata, but others occur only in a few strata, and a few species had their births and extinctions within one particular stratum. Fossils are thus identifying markers for particular periods in Earth's history.Not only could Smith identify rock strata by the fossils they contained, he could also see a pattern emerging: certain fossils always appear in more ancient sediments, while others begin to be seen as the strata become more recent. By following the fossils, Smith was able to put all the strata of England's earth into relative temporal sequence. About the same time, Georges Cuvier made the same discovery while studying the rocks around Paris.10. The word “virtually” in the passage is closest in meaning toA. possiblyB. absolutelyC. surprisinglyD. nearly11. Select the TWO answer choices that are true statements based upon the discussion of the principle of faunal succession in paragraph 5. To receive credit, you must select TWO answers.A. It was a principle that applied to fauna but not to flora.B. It was discovered independently by two different geologists.C. It describes how fossils are distributed in rock strata.D. It explains why plants and animals undergo transformations through time.Soon it was realized that this principle of faunal (animal) succession was valid not only in England or France but virtually everywhere. It was actually a principle of floral succession as well, because plants showed the same transformation through time as did fauna. Limestone may be found in the Cambrian or— 300 million years later—in the Jurassic strata, but a trilobite—the ubiquitous marine arthropod that had its birth in the Cambrian—will never be found in Jurassic strata, nor a dinosaur in the Cambrian.12.In m entioning "trilobite” , the author is making which of the following points?A. Fossils cannot be found in more than one rock stratum.B. Faunal succession can help put rock layers in relative temporal sequence.C. Faunal succession cannot be applied to different strata composed of the same kind of rock.D. The presence of trilobite fossils makes it difficult to date a rock.Not only could Smith identify rock strata by the fossils they contained, he could also see a pattern emerging: certain fossils always appear in more ancient sediments, while others begin to be seen as the strata become morerecent. ■By following the fossils, Smith was able to put all the strata of England's earth into relative temporalsequence. ■About the same time, Georges Cuvier made the same discovery while studying the rocks around Paris.■Soon it was realized that this principle of faunal (animal) succession was valid not only in England or France butvirtually everywhere.^ It was actually a principle of floral succession as well, because plants showed the sametransformation through time as did fauna. Limestone may be found in the Cambrian or—300 million years later— in the Jurassic strata, but a trilobite—the ubiquitous marine arthropod that had its birth in the Cambrian—will never be found in Jurassic strata, nor a dinosaur in the Cambrian.13. Look at the four squares [_]that indicate where the following sentence could be added to the passage. Where would the sentence best fit?The findings of these geologists inspired others to examine the rock and fossil records in different parts of the world.14. Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points. William Smith’ s contributions to geology have increased our knowledge of the Earth’ s history.A. Smith found success easily in his profession because he came from a family of geologists and surveyors.B. Smith ’ s work on canals allowed him to collect fossils and study rock layers all over England.C. Smith found that fossils are much more reliable indicators of geological time than rock strata are.D. Smith was named “the father of English geology” for his maps rather than for his other contributions to the field.E. Smith and Cuvier discovered that fossil patterns are easier to observe in ancient rock strata than in younger rock strata.F. The discovery of the principle of faunal succession allowed geologists to establish the relative age of Earth’ s rock layers.。

【威学教育王鑫】托福阅读TPO2-1文本

【王鑫托福阅读】TPO2-1阅读文本TPO2TPO2-1 Desert Formation1. The word threatened in the passage is closest in meaning toA. RestrictedB. EndangeredC. PreventedD. Rejected2. According to paragraph 3, the loss of natural vegetation has which of the following consequences for soil?A. Increased stony contentB. Reduced water absorptionC. Increased numbers of spaces in the soilD. Reduced water runoffThe deserts, which already occupy approximately a fourth of the Earth's land surface, have in recent decades been increasing at an alarming pace. The expansion of desert like conditions into areas where they did not previously exist is called desertification. It has been estimated that an additional one-fourth of the Earth's land surface is threatened by this process.Desertification is accomplished primarily through the loss of stabilizing natural vegetation and the subsequent accelerated erosion of the soil by windand water. In some cases the loose soil is blown completely away, leaving a stony surface. In other cases, the finer particles may be removed, while the sand-sized particles are accumulated to form mobile hills or ridges of sand.Even in the areas that retain a soil cover, the reduction of vegetation typically results in the loss of the soil's ability to absorb substantial quantities of water. The impact of raindrops on the loose soil tends to transfer fine clay particles into the tiniest soil spaces, sealing them and producing a surface that allows very little water penetration. Water absorption is greatly reduced; consequently runoff is increased, resulting in accelerated erosion rates. The gradual drying of the soil caused by its diminished ability to absorb water results in the further loss of vegetation, so that a cycle of progressive surface deterioration is established.In some regions, the increase in desert areas is occurring largely as the result of a trend toward drier climatic conditions. Continued gradual global warming has produced an increase in aridity for some areas over the past few thousand years. The process may be accelerated in subsequent decades if global warming resulting from air pollution seriously increases.3. The word delicate in the passage is closest in meaning toA. FragileB. PredictableC. ComplexD. Valuable4. According to paragraph 5, in dry periods, border areas have difficultyA. Adjusting to stresses created by settlementB. Retaining their fertility after desertificationC. Providing water for irrigating cropsD. Attracting populations in search of food and fuel5. The word progressively in the passage is closest in meaning toA. OpenlyB. ImpressivelyC. ObjectivelyD. Increasingly6. According to paragraph 6, which of the following is often associated with raising crops?A. Lack of proper irrigation techniquesB. Failure to plant crops suited to the particular areaC. Remova丨 of the original vegetationD. Excessive use of dried animal waste;mlluwmg isThere is little doubt, however, that desertification in most areas results primarily from human activities rather than natural processes. The semiarid lands bordering the deserts exist in a delicate ecological balance and are limited in their potential to adjust to increased environmental pressures. Expanding populations are subjecting the land to increasing pressures to provide them with food and fuel. In wet periods, the land may be able to respond to these stresses. During the dry periods that are common phenomena along the desert margins, though, the pressure on the land is often far in excess of its diminished capacity, and desertification results.Four specific activities have been identified as major contributors to the desertification processes: overcultivation, overgrazing, firewood gathering, and overirrigation. The cultivation of crops has expanded into progressively drier regions as population densities have grown. These regions are especially likely to have periods of severe dryness, so that crop failures are common. Since the raising of most crops necessitates the prior removalof the natural vegetation, crop failures leave extensive tracts of land devoid of a plant cover and susceptible to wind and water erosion.7.The phrase devoid of in the passage is closest in meaning to A Consisting of B Hidden by C Except for D Lacking inThe raising of livestock is a major economic activity in semiarid lands, where grasses are generally the dominant type of natural vegetation.The consequences of an excessive number of livestock grazing in an area are the reduction of the vegetation cover and the trampling and pulverization of the soil. This is usually followed by the drying of the soil and accelerated erosion.Firewood is the chief fuel used for cooking and heating in many countries. The increased pressures of expanding populations have led to the removal of woody plants so that many cities and towns are surrounded by large areas completely lacking in trees and shrubs. The increasing use of dried animal waste as a substitute fuel has also hurt the soil because this valuable soil conditioner and source of plant nutrients is no longer being returned to the land.D.Bring salts to the surfaceThe final major human cause of desertification is soil salinization resulting from overirrigation. Excess water from irrigation sinks down into the water table. If no drainage system exists, the water table rises, bringing dissolved salts to the surface. The water evaporates and the salts are left behind, creating a white crustal layer that prevents air and water from reaching the underlying soil.9. All of the following are mentioned in the passage as contributing to desertification EXCEPTA. Soil erosionB. Global warmingC. Insufficient irrigationD. The raising of livestock10. Which of the sentences below best expresses the essential information in the highlighted sentence in the passage?Incorrect choices change the meaning in important ways or leave out essential information.A. Desertification is a significant problem because it is so hard to reverse and affects large areas of land and great numbers of people.B. Slowing down the process of desertification is difficult because of population growth that has spread over large areas of land.C. The spread of deserts is considered a very serious problem that can be solved only if large numbers of people in various countries are involved in the effort.D. Desertification is extremely hard to reverse unless the population is reduced in the vast areas affected.The extreme seriousness of desertification results from the vast areas of land and the tremendous numbers of people affected, as well as from the great difficulty of reversing or even slowing the process.Once the soil has been removed by erosion, only the passage of centuries or millennia will enable new soil to form. In areas where considerable soil still remains, though, a rigorously enforced program of land protection and cover-crop planting may make it possible to reverse the present deterioration of the surface.11. It can be inferred from the passage that the author most likely believes which of the following about the future of desertification?A. Governments will act quickly to control further desertification.B. The factors influencing desertification occur in cycles and will change in the future.C. Desertification will continue to increase.D. Desertification will soon occur in all areas of the world■The raising of livestock is a major economic activity in semiarid lands, where grasses are generally the dominant type of natural vegetation.^The consequences of an excessive number of livestock grazing in an area are the reduction of the vegetation cover and the trampling and pulverization of the soil. ■This is usually followed by the drying of the soil and accelerated erosion._12. Look at the four squares [■] that indicate where the following sentence can be added to the passage. Where would the sentence best fit?This economic reliance on livestock in certain regions makes large tracts of land susceptible to overgrazing.13. Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some answer choices do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points. Many factors have contributed to the great increase in desertification in recent decades.A. Growing human populations and the agricultural demands that come with such growth have upset the ecological balance in some areas and led to the spread of deserts.B. As periods of severe dryness have become more common, failures of a number of different crops have increased.C. Excessive numbers of cattle and the need for firewood for fuel have reduced grasses and trees, leaving the land unprotected and vulnerable.D. Extensive irrigation with poor drainage brings salt to the surface of the soil, a process that reduces water and air absorption.E. Animal dung enriches the soil by providing nutrients for plant growth.F. Grasses are generally the dominant type of natural vegetation in semiarid lands.。

【威学教育】王鑫托福阅读TPO14-3阅读文本

【王鑫托福阅读】托福TPO 15-1阅读文本TPO 15TPO15-1 A Warm Blooded Turtle1. The phrase “unique among” in the passage is closest in meaning toA natural toB different from all otherC quite common amongD familiar toWhen it comes to physiology, the 丨eatherback turtle is, in some ways, more like a reptilian whale than a turtle. It swims farther into the cold of the northern and southern oceans than any other sea turtle, and it deals with the chilly waters in a way unique among reptiles.2. What can be inferred about whales from paragraph 1?A They are considered by some to be reptiles.B Their bodies are built in a way that helps the manage extremely cold temperatures.C They are distantly related to leatherback turtlesD They can swim farther than leatherback turtl3. The word “feat” in the passage is closest in meaning toA remarkable achievementB common transformationC daily activityD complex solution4. Paragraph 2 mentions all of the following as true about the body heat of adult leatherback turtles EXCEPT:A Their muscles produce heat for maintaining body temperature.B Their dark bodies help trap solar radiation.C Their cellular metabolism produces heat as a by-product.D Basking at the water's surface helps them obtain heat.A warm-blooded turtle may seem to be a contradiction in terms. Nonetheless, an adult leatherback can maintain a body temperature of between 25 and 26°C (77-79°F) in seawater that is only 8°C (46.4°F). Accomplishing this feat requires adaptations both to generate heat in the turtle's body and to keep it from escaping into the surrounding waters. Leatherbacks apparently do not generate internal heat the way we do, or the way birds do, as a by-product of cellular metabolism. A leatherback may be able to pick up some body heat by basking at the surface; its dark, almost black body color may help it to absorb solar radiation. However, most of its internal heat comes from the action of its muscles.5. The word "bulk” in the passage is closest in meaning toA strengthB effortC activityD mass6. The word "it” in paragraph 4 refers to A the problem B blood C the turtle D body temperature7. According to paragraph 4, which of the following features enables the leatherback turtle to stay warm? A An insulating layer of blubber B A thick, oily skin covering fatty tissue C The aerodynamic shape of its flippers D A well-insulated headLeatherbacks keep their body heat in three different ways. The first, and simplest, is size. The bigger the animal is, the lower its surface-to-volume ratio; for every ounce of body mass, there is proportionately less surface through which heat can escape. An adult leatherback is twice the size of the biggest cheloniid sea turtles and will therefore take longer to cool off. Maintaining a high body temperature through sheer bulk is called gigantothermy. It works for elephants, for whales, and, perhaps, it worked for many of the larger dinosaurs. It apparently works, in a smaller way, for some other sea turtles. Large loggerhead and green turtles can maintain their body temperature at a degree or two above that of the surrounding water, andgigantothermy is probably the way they do it. Muscular activity helps, too, and an actively swimming green turtle may be 7°C (12.6°F) warmer than the waters it swims through.Gigantothermy, though, would not be enough to keep a leatherback warm in cold northern waters. It is not enough for whales, which supplement it with a thick layer of insulating blubber (fat). Leatherbacks do not have blubber, but they do have a reptilian equivalent: thick, oil-saturated skin, with a layer of fibrous, fatty tissue just beneath it. Insulation protects the leatherback everywhere but on its head and flippers. Because the flippers are comparatively thin and blade-like, they are the one part of the leatherback that is likely to become chilled. There is not much that the turtle can do about this without compromising the aerodynamic shape of the flipper. The problem is that as blood flows through the turtle's flippers, it risks losing enough heat to lower the animal's central body temperature when it returns. The solution is to allow the flippers to cool down without drawing heat away from the rest of the turtle's body. The leatherback accomplishes this by arranging the blood vessels in the base of its flipper into a countercurrent exchange system.In a countercurrent exchange system, the blood vessels carrying cooled blood from the flippers run close enough to the blood vessels carrying warm blood from the body to pick up some heat from the warmer blood vessels; thus, the heat is transferred from the outgoing to the ingoing vessels before itreaches the flipper itself.This is the samearrangement found in anold-fashioned steam radiator,in which the coiled pipes pass heat back and forth aswater courses through them. The leatherback is certainly not the only animal with such an arrangement; gulls have a countercurrent exchange in their legs. That is why a gull can stand on an ice floe without freezing.8. Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information.A In a turtle's countercurrent exchange system, outgoing vessels lie near enough to ingoing ones that heat can be exchanged from the former to the latter before reaching the turtle's flippers.B Within the turtle's flippers, there is a countercurrent exchange system that allows colder blood vessels to absorb heat from nearby warmer blood vessels and then return warmed blood to the turtle's body.C In a countercurrent exchange system, a turtle can pick up body heat from being close enough to other turtles, thus raising its blood temperature as it passes them.D When a turtle places its flippers close to its body, it is able to use its countercurrent exchange system to transfer heat from the warmer blood vessels in its body to the cooler blood vessels in its flippers.9. Why does the author mention old-fashioned steam radiator in the discussion of countercurrent exchange systems?A To argue that a turtle's central heating system is not as highly evolved as that of other warmblooded animalsB To provide a useful comparison with which to illustrate how a countercurrent exchange system worksC To suggest that steam radiators were modeled after the sophisticated heating system of turtlesD To establish the importance of the movement of water in countercurrent exchange systems10. The phrase "courses through” in the passage is closest in meaning to A rises through B heats up in C runs through D collects in11. According to paragraph 6, which of the following statements is most accurate about young leatherback turtles?A They lack the countercurrent exchange systems that develop in adulthood.B Their rate of growth is slower than that of other sea turtles.C They lose heat easily even with insulation and countercurrent exchange systems.D They switch between cold-blooded and warm-blooded modes throughout their hatchling stage.All this applies, of course, only to an adult leatherback. Hatchlings are simply too small to conserve body heat, even with insulation and countercurrent exchange systems. We do not know how old, or how large, a leatherback has to be before it can switch from a cold-blooded to a warm-blooded mode of life. Leatherbacks reach their immense size in a much shorter time than it takes other sea turtles to grow. Perhaps their rush to adulthood is driven by a simple need to keep warm.Leatherbacks keep their body heat in three different ways. The first, and simplest, is size. The bigger the animal is, the lower its surface-to-volume ratio; for every ounce of body mass, there is proportionately less surface through which heat can escape. An adult leatherback is twice the size of the biggest cheloniid sea turtles and will therefore take longer to cool off. Maintaining a high body temperature through sheer bulk is called gigantothermy. ■ It works for elephants, for whales, and, perhaps, it worked for many of the larger dinosaurs. ■ It apparently works, in a smaller way, for some other sea turtles. ■ Large log gerhead and green turtles can maintain their body temperature at a degree or two above that of the surrounding water, and gigantothermy is probably the way they do it. ■ Muscular activity helps, too, and an actively swimming green turtle may be 70C (12.60F) warmer than the waters it swims through.12. Look at the four squares [ ■ ] that indicate where the following sentence could be added to the passage. Where would the sentence best fit?However, these animals have additional means of staying warm.13. Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points.Contrary to what we would expect of reptiles, the leatherback turtle is actually warm-blooded.A. Even though they swim into cold ocean waters, leatherbacks maintain their body heat in much the same way as sea turtles in warm southern oceans do.B. The leatherback turtle uses a countercurrent exchange system in order to keep the flippers from drawing heat away from the rest of the body.C. The shape of the leatherback turtle's flippers is especially important in maintaining heat in northern waters.D. extremely coldThe leatherback turtle is able to maintain body heat through sheer size.E. Leatherbacks have an insulating layer that can be considered the reptilian version of blubber.F. a cold-bloodedYoung leatherbacks often do not survive to adulthood because they are not able to switch from way of life to a warm-blooded one quickly enough.。

【威学教育】王鑫托福阅读TPO18-2阅读文本

【王鑫托福阅读】托福TPO 18-2阅读文本TPO 18TPO18-2 The mystery of yawning1. Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information .A. It is the conventional theory that when people are bored or sleepy, they often experience a drop in blood oxygen levels due to their shallow breathing.B. The conventional theory is that people yawn when bored or sleepy because yawning raises blood oxygen levels, which in turn raises alertness.C. According to conventional theory, yawning is more likely to occur when people are bored or sleepy than when they are alert and breathing deeply.D. Yawning, according to the conventional theory, is caused by boredom or lack of sleep and can be avoided through deeper breathing.2.In paragragh1, what point does the author make about the evidence for the tiredness theory of yawning? A.There is no scientific evidence linking yawning with tiredness.B. The evidence is wide-ranging because it covers multiple age-groups.C. The evidence is reliable because it was collected over a long period of time.D. The evidence is questionable because the yawning patterns of children and adults should be different.According to conventional theory, yawning takes place when people are bored or sleepy and serves the function of increasing alertness by reversing, through deeper breathing, the drop in blood oxygen levels that are caused by the shallow breathing that accompanies lack of sleep or boredom. Unfortunately, the few scientific investigations of yawning have failed to find any connection between how often someone yawns and how much sleep they have had or how tired they are. About the closest any research has come to supporting the tiredness theory is to confirm that adults yawn more often on weekdays than at weekends, and that school children yawn more frequently in their first year at primary school than they do in kindergarten.3. The word “flaw” in the passage is closest in meaning toA. faultB. aspectC. confusionD. mystery4.In the paragraph 2, why does the author note that there were physiological changes when subjects opened their mouths or breathed deeply?A. To present an argument in support of the tiredness theoryB. To cast doubt on the reliability of the tests that measured heart rate, muscle tension and skin conductanceC. To argue against the hypothesis that yawning provides a special way to improve alertness or raise physiological activityD. To support the idea that opening the mouth or breathing deeply can affect blood oxygen levels5. The word “triggered”meaning to A.removedB. followedC. increasedD. causedin the passage is closest inAnother flaw of the tiredness theory is that yawning does not raise alertness or physiological activity, as the theory would predict. When researchers measured the heart rate, muscle tension and skin conductance of people before, during and after yawning, they did detect some changes in skin conductance following yawning, indicating a slight increase in physiological activity. However, similar changes occurred when the subjects were asked simply to open their mouths or to breathe deeply. Yawning did nothing special to their state of physiological activity. Experiments have also cast serious doubt on the belief that yawning is triggered by a drop in blood oxygen or a rise in blood carbon dioxide. Volunteers were told to think about yawning while they breathed either normal air, pure oxygen, or an air mixture with an above-normal level of carbon dioxide. If the theory was correct, breathing air with extra carbon dioxide should have triggered yawning, while breathing pure oxygen should have suppressed yawning. In fact, neither condition made any difference to the frequency of yawning, which remained constant at about 24 yawns per hour. Another experiment demonstrated that physical exercise, which was sufficiently vigorous to double the rate of breathing, had no effect on the frequency of yawning. Again the implication is that yawning has little or nothing to do with oxygen.6. Paragraph 2 answers all of the following questions about yawning EXCEPTA. Does yawning increase alertness or physiological activity?B. Does thinking about yawning increase yawning over not thinking about yawning?C. Does the amount of carbon dioxide and oxygen in the air affect the rate at which people yawn?D. Does the rate of breathing affect the rate at which people yawn?7. The word "periodically” in the pas sage is closest in the meaning toA.continuouslyB. quicklyC. regularlyD. carefully8. According to the developmental theory of yawning presented in paragraph 3, what is the role of yawning?A. It caused hiccups, which aid in the development of the lungs.B. It controls the amount of pressure the lungs place on other developing organs.C. It prevents amniotic fluid from entering the lungs.D. It removes a potentially harmful fluid from the lungs.9. According to the developmental theory of yawning presented in paragraph 3, what is the role of yawning?A. It caused hiccups, which aid in the development of the lungs.B. It controls the amount of pressure the lungs place on other developing organs.C. It prevents amniotic fluid from entering the lungs.D. It removes a potentially harmful fluid from the lungs.A completely different theory holds that yawning assists in the physical development of the lungs early in life, but has no remaining biological function in adults. It has been suggested that yawning and hiccupping might serve to clear out the fetuses airways. The lungs of a fetus secrete a liquid that mixes with its mother's amniotic fluid. Babies with congenital blockages that prevent this fluid from escaping from their lungs are sometimes born withdeformed lungs. It might be that yawning helps to clear out the lungs by periodically owering the pressure in them. According to this theory, yawning in adults is just a developmental fossil with no biological function. But, while accepting that not everything in life can be explained by Darwinian evolution, there are sound reasons for being skeptical of theories like this one, which avoid the issue of what yawning does for adults. Yawning is distracting, consumes energy and takes time. It is almost certainly doing something significant in adults as well as in fetuses. What could itbe?10. The word “empirical” in the passage is closest in meaning toA. reliableB. based on common senseC. relevantD. based on observation11. The study of yawning behavior discussed in paragraph 4 supports which of the following conclusions?A. Yawning is associated with an expectation of increased physical activity.B. Yawning occurs more frequently when people are asked to record their yawning.C. People tend to yawn about fifteen minutes before they become tired or bored.D. 12.Why does the author mention“soldiersyawningbefore combat, musiciansyawningbeforeperforming, and athletesyawningbeforesical activityMental or physical stress tends to make people yawn.competing”?A. To argue that just the expectation of physica can make some people feel tiredB. To explain how the view that people yawn because they are tired accounts for yawning before stressful situationsC. To support the view that yawning helps prepare a person for mental or physical exertionD. To provide anecdotal evidence that conflicts with the experience of the volunteers in the studyThe empirical evidence, such as it is, suggests an altogether different function for yawning—namely, that yawning prepares us for a change in activity level. Support for this theory came from a study of yawning behavior in everyday life. Volunteers wore wrist-mounted devices that automatically recorded their physical activity for up to two weeks: the volunteers also recorded their yawns by pressing a button on the device each time they yawned. The data showed that yawning tended to occur about 15 minutes before a period of increased behavioral activity. Yawning bore no relationship to sleep patterns, however. This accords with anecdotal evidence that people often yawn in situations where they are neither tired nor bored, but are preparing for impending mental and physical activity. Such yawning is often referred to as "incongruous" because it seems out of place, at least on the tiredness view: soldiers yawning before combat, musicians yawning before performing, and athletes yawning before competing. Their yawning seems to have nothing to do with sleepiness or boredom—quite the reverse—but it does precede a change in activity level.physiological activity, as the theory would predict. When researchers measured the heart rate, muscle tension and skin conductance of people before, during and after yawning, they did detect some changes in skin conductance following yawning, indicating a slight increase in physiological activity. However, similar changes occurred when the subjects were asked simply to open their mouths or to breathe deeply. Yawning did nothing special to their stateof physiological activity. Experiments have also cast serious doubt on the belief that yawning is triggered by adrop in blood oxygen or a rise in blood carbon dioxide. (Volunteers were told to think about yawning while theybreathed either normal air, pure oxygen, or an air mixture with an above-normal level of carbon dioxide._ If the theory was correct, breathing air with extra carbon dioxide should have triggered yawning, while breathing pure oxygen should have suppressed yawning. _In fact, neither condition made any difference to the frequency ofyawning, which remained constant at about 24 yawns per hour. (Another experiment demonstrated that physicalexercise, which was sufficiently vigorous to double the rate of breathing, had no effect on the frequency of yawning. Again the implication is that yawning has little or nothing to do with oxygen.13. Look at the four squares ( that indicate where the following sentence could be added to the passage.14. Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THERR answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points. The tiredness theory of yawning does not seem to explain why yawning occurs.A. Although earlier scientific studies strongly supported the tiredness theory, new evidence has cast doubt on these findings.B. Some have proposed that yawning plays a role in the development if lungs before birth but that it serves no purpose in adults.C. New studies, along with anecdotal evidence, have shown that the frequency of yawning increases during extended periods of inactivity.D. Evidence has shown that yawning is almost completely unrelated to amount of oxygen in the blood and is unrelated to sleep behavior.E. Fluids in the lungs of the prevent yawning from occurring, which disproves the developmental theory of yawning.F. There is some evidence that suggests that yawning prepares the body and mind for a change in activity level.。

【威学教育王鑫】想掌握托福阅读考点,就要多做托福真题

威学教育|专注雅思、托福等出国考试培训网址：想掌握托福阅读考点，就要多做托福真题在托福考试中流传着这样一句话：得词汇者得阅读，得阅读者得托福！在威学教育经常会遇到很多学生来上托福课，难的单词到是认识很多，但是题眼的单词是抓不到的，托福阅读出题题眼的单词并不都是高深的词汇，因为在表达中不管是中英文都是用简单明了的语言来表达思想的，而很多同学着眼于8000词汇中通常不用的词汇，而抛弃了高中词汇的3500词或大学的4500词，那么这样是不是在解题的时候容易抓不到意思呢?切忌，新托福阅读词汇是关键，但重中之重是重点词汇。

威学教育托福导师sally指出，不少学生对于该如何做题一直纠结不清，到底是先看文章再做题，还是直接跳过文章去做题目?每一种方法都有每一种方法的利与弊，比如说学生们也自己总结出一套方法，先看一段，然后做相应的题目，这样既可以读到文章心理踏实也可以及时记住文章中的内容，此种方法也不失为一种好方法。

前面的三种方法都可以用来做题，也都有各自的好处。

那么以上三种方法，大家可以课下在做练习的时候都试用一下，哪一种方法最适合自己就用哪一种方法。

巧用托福阅读真题让考点清晰(1)构成因果处是考点，两事物或者多事物间的因果顺序关系要弄清楚。

(2)两事物或对象对比、类比、比较处是考点。

当出现此类语言叙述时，必须要弄清楚两事物或几个事物间的相同点，相异点的特征分别是什么，他们之间有什么联系或者关联。

时间，空间，程度或者间接转折均能构成对比或者比较其相似或相异性。

(3)事物叙述的缺陷处所在是考点。

此时要弄清缺陷与所叙述的事物不足处是什么，如果文章提出了改进方法，还必须知道改进和或弥补的方法又是什么，在众多方法中，作者到底同意或者赞同哪一个，一般来说是最后一个观点。

)(4)特殊语言处是考点，例如：最高级和比较级处，各种长难复合句，高级词汇所在句子以及特殊易混的短语习语处。

(5)强转折是考点，引入新观点或者反驳前所叙述的主题处是考点，其中转折的方式很多，除了传统的however, but, yet外，其他方式的转折也必须注意，尤其是一个概念向另一个概念过渡的地方。

【威学教育王鑫整理出品】托福TPO6-3阅读文本

【王鑫托福阅读】托福TPO6-3阅读文本TPO6TPO6-3 Infantile AmnesiaB. repetitionC. occurrenceD. idea1. What purpose does paragraph 2 serve in the larger discussion of children ’ s inability to recall early experiences?A. To argue that theories that are not substantiated by evidence should generally be considered unreliableB. To argue that the hypotheses mentioned in paragraph 2 have been more thoroughly researched than have the theories mentioned later in the passageC. To explain why some theories about infantile amnesia are wrong before presenting ones more likely to be trueD. To explain why infantile amnesia is of great interest to researchers2. The word “plausible” in the passage is closest in meaning toA. flexibleB. believableC. debatableD. predictable3. The word “phenomenon” in the passage is closest in meaning toA.exceptionWhat do you remember about your life before you were three? Few people can remember anything that happened to them in their early years. Adults' memories of the next few years also tend to be scanty. Most people remember only a few events—usually ones that were meaningful and distinctive, such as being hospitalized or a sibling's birth.How might this inability to recall early experiences be explained? The sheer passage of time does not account for it; adults have excellent recognition of pictures of people who attended high school with them 35 years earlier. Another seemingly plausible explanation—that infants do not form enduring memories at this point in development—also is incorrect. Children two and a half to three years old remember experiences that occurred in their first year, and eleven month olds remember some events a year later. Nor does the hypothesis that infantile amnesia reflects repression—or holding back—of sexually charged episodes explain the phenomenon. While such repression may occur, people cannot remember ordinary events from the infant and toddler periods either.4. All of the following theories about the inability to recall early experiences are rejected in paragraph 2 EXCEPT:A. The ability to recall an event decreases as the time after the event increases.B. Young children are not capable of forming memories that last for more than a short time.C. People may hold back sexually meaningful memories.D. Most events in childhood are too ordinary to be worth remembering.5. What does paragraph 3 suggest about long-term memory in children?A. Maturation of the frontal lobes of the brain is important for the long-term memory of motor activities but not verbal descriptions.B. Young children may form long-term memories of actions they see earlier than of things they hear or are told.C. Young children have better long-term recall of short verbal exchanges than of long ones.D. Children ’ s long-term recall of motor activities increases when such activities are accompanied by explicit verbal descriptions.6. According to paragraph 4, what role may storytelling play in forming childhood memories?A. It may encourage the physiological maturing of the brain.B. It may help preschool children tell the difference between ordinary and unusual memories.C. It may help preschool children retrieve memories quickly.D. It may provide an ordered structure that facilitates memory retrieval.Three other explanations seem more promising. One involves physiological changes relevant to memory. Maturation of the frontal lobes of the brain continues throughout early childhood, and this part of the brain may be critical for remembering particular episodes in ways that can be retrieved later. Demonstrations of infants ’ and toddlers' long-term memory have involved their repeating motor activities that they had seen or done earlier, such as reaching in the dark for objects, putting a bottle in a doll’ s mouth, or pulling apart two pieces of a toy. The brain ’ s level of physiological maturation may support these types of memories, but not ones requiring explicit verbal descriptions.A second explanation involves the influence of the social world on children’ s language use. Hearing and telling stories about events may help children store information in ways that will endure into later childhood and adulthood. Through hearing stories with a clear beginning, middle, and ending children may learn to extract the gist of events in ways that they will be able to describe many years later. Consistent with this view, parents and children increasingly engage in discussions of past events when children are about threeyears old. However, hearing such stories is not sufficient for younger children to form enduring memories. Telling such stories to two year olds does not seem to produce long-lasting verbalizable memories.7. The word “critically” in the passage is closest in meaning toA. fundamentallyB. partiallyC. consistentlyD. subsequently8. The word “perspective” in the passage is closest in meaning toA. systemB. theoryC. sourceD. viewpoint9. The phrase “This view” in the passage refers to the belief thatA. the ability to retrieve a memory partly depends on the similarity between the encoding and retrieving processB. the process of encoding information is less complex for adults than it is for young adults and infantsC. infants and older children are equally dependent on discussion of past events for the retrieval of informationD. infants encode information in the same way older children and adults do10. According to paragraphs 5 and 6, one disadvantage very young children face in processing information is that they cannotA. B. organize experiences according to typeC. block out interruptionsD. interpret the tone of adult languageprocess a lot of information at one timeA third likely explanation for infantile amnesia involves incom p a tibil ities bet ween t he ways in which infants encode information and the ways in which older children and adults retrieve it. Whether people can remember an event depends critically on the fit between the way in which they earlier encoded the information and the way in which they later attempt to retrieve it. The better able the person is to reconstruct the perspective from which the material was encoded, the more likely that recall will be successful.This view is supported by a variety of factors that can create mismatches between very young children's encoding and older children's and adults' retrieval efforts. The world looks very different to a person whose head is only two or three feet above the ground than to one whose head is five or six feet above it. Older children and adults often try to retrieve the names of things they saw, but infants would not have encoded the information verbally. General knowledge of categories of events such as a birthday party or a visit to the doctor's office helps older individuals encode their experiences, but again, infants and toddlers are unlikely to encode many experiences within such knowledge structures.11. Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information.A. Incomplete physiological development may partly explain why hearing stories does not improve long-term memory in infants and toddlers.B. One reason why preschoolers fail to comprehend the stories they hear is that they are physiologically immature.C. Given the chance to hear stories, infants and toddlers may form enduring memories despite physiological immaturity.D. Physiologically mature children seem to have no difficulty remembering stories they heard as preschoolers.These three explanations of infantile amnesia are not mutually exclusive; indeed, they support each other. Physiological immaturity may be part of why infants and toddlers do not form extremely enduring memories, even when they hear stories that promote such remembering in preschoolers. Hearing the stories may lead preschoolers to encode aspects of events that allow them to form memories they can access as adults. Conversely, improved encoding of what they hear may help them better understand and remember stories and thus make the stories more useful for remembering future events. Thus, all three explanations—physiological maturation, hearing and producing stories about past events, and improved encoding of key aspects of events—seem likely to be involved in overcoming infantile amnesia.12. How does paragraph 7 relate to the earlier discussion of infantile amnesia?A. It introduces a new theory about the causes of infantile amnesia.B. It argues that particular theories discussed earlier in the passage require further research.C. It explains how particular theories discussed earlier in the passage may work in combination.D. It evaluates which of the theories discussed earlier is most likely to be true.What do you remember about your life before you were three? _Few people can remember anything thathappened to them in their early years. ■Adults' memories of the next few yea rs also tend to be scanty. ■Most people remember only a few events—usually ones that were meaningful and distinctive, such as being hospitalized or a sibling's birth. ■13. Look at the four squares [■] that indicate where the following sentence could be added to the passage. Wherewould the sentence best fit?Other important occasions are school graduations and weddings.14. Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points. There are several possible explanations why people cannot easily remember their early childhoods.A. Preschoolers typically do not recall events from their first year.B. Frontal lobe function of the brain may need to develop before memory retrieval can occur.C. Children recall physical activities more easily if they are verbalized.D. The opportunity to hear chronologically narrated stories may help three-year-old children produce long-lasting memories.E. The content of a memory determines the way in which it is encoded.F. The contrasting ways in which young children and adults process information may determine their relative success in remembering.。

【威学教育】王鑫托福阅读TPO5-4阅读文本

【王鑫托福阅读】托福TPO6-1阅读文本TPO6TPO6-1 Powering the Industrial Revolution1. Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information.A. Running water was the best power source for factories since it could keep machines operating continuously, but since it was abundant only in Lancashire and Scotland, most mills and factories that were located elsewhere could not be water driven.B. The disadvantage of using waterpower is that streams do not necessarily flow in places that are the most suitable for factories, which explains why so many water-powered grain and textile mills were located in undesirable places.C. Since machines could be operated continuously only where running water was abundant, grain and textile mills, as well as other factories, tended to be located only in Lancashire and Scotland.D. Running water was the only source of power that was suitable for the continuous operation of machines, but to make use of it, factories had to be located where the water was, regardless of whether such locations made sense otherwise.In Britain one of the most dramatic changes of the Industrial Revolution was the harnessing of power. Until the reign of George 111(1760-1820), available sources of powe r for work and travel had not increased since theMiddle Ages. There were three sources of power: animal or human muscles; the wind, operating on sail or windmill; and running water. Only the last of these was suited at all to the continuous operating of machines, and although waterpower abounded in Lancashire and Scotland and ran grain mills as well as textile mills, it had one great disadvantage: streams flowed where nature intended them to, and water-driven factories had to be located on their banks whether or not the location was desirable for other reasons. Furthermore, even the most reliable waterpower varied with the seasons and disappeared in a drought. The new age of machinery, in short, could not have been born without a new source of both movable and constant power.2. Which of the following best describes the relation of paragraph 2 to paragraph 1?A. Paragraph 2 shows how the problem discussed in paragraph 1 arose.B. Paragraph 2 explains how the problem presented in paragraph 1 came to be solved.C. Paragraph 2 provides a more technical discussion of the problem introduced in paragraph 1.D. Paragraph 2 shows why the problem discussed in paragraph 1 was especially important to solve.3. The word “exploited” in the passage is closest in meaning toA. utilizedB. recognizedC. examinedD. fully understood4. The word “vastly” in the passage is closet in meaning toA. quicklyB. ultimatelyC. greatlyD. initially5. According to paragraph 2, the “atmospheric engine was slow becauseA. it had been designed to be used in coal minesB. the cylinder had to cool between each strokeC. it made use of expanding steam to raise the piston in its cylinderD. it could be operated only when a large supply of fuel was available6. According to paragraph 2, Watt's steam engine differed from earlier steam engines in each of the following ways EXCEPT:A. It used steam to move a piston in a cylinder.B. It worked with greater speed.C. It was more efficient in its use of fuel.D. It could be used in many different ways.The source had long been known but not exploited. Early in the eighteenth century, a pump had e into use in which expanding steam raised a piston in a cylinder, and atmospheric pressure brought it down again when the steam condensed inside the cylinder to form a vacuum. This “ atmospheric engine, ”invented by Thomas Savery and vastly improved by his partner, Thomas Newen, embodied revolutionary principles, but it was so slow and wasteful of fuel that it could not be employed outside the coal mines for which it had been designed. In the 1760s, James Watt perfected a separate condenser for the steam, so that the cylinder did not have to be cooled at every stroke; then he devised a way to make the piston turn a wheel and thus convert reciprocating (back and forth) motion into rotary motion. He thereby transformed an inefficient pump of limited use into a steam engine of a thousand uses. The final step came when steam was introduced into the cylinder to drive the piston backward as well as forward, thereby increasing the speed of the engine and cutting its fuel consumption.7.In paragraph 3, the author mentions W illiam Murdoch’ s invention ofa new form of nighttime illumination in order toA. indicate one of the important developments made possible by the introduction of Watt's steam engineB. make the point that Watt's steam engine was not the only invention of importance to the Industrial RevolutionC. illustrate how important coal was as a raw material for the Industrial RevolutionD. provide an example of another eighteenth-century invention that used steam as a power source8. The phrase “grew accustomed to” in the passage is closest in meaning toA. began to preferB. wanted to haveC. became used toD. insisted onWatt's steam engine soon showed what it could do. It liberated industry from dependence on running water. The engine eliminated water in the mines by driving efficient pumps, which made possible deeper and deeper mining. The ready availability of coal inspired William Murdoch during the 1790s to develop the first new form of nighttime illumination to be discovered in a millennium and a half. Coal gas rivaled smoky oil lamps and flickering candles, and early in the new century, well-to-do Londoners grew accustomed to gaslit houses and even streets. Iron manufacturers, which had starved for fuel while depending on charcoal, also benefited from ever-increasing supplies of coal: blast furnaces with steam-powered bellows turned out more iron and steel for the new machinery. Steam became the motive force of the Industrial Revolution as coal and iron ore were the raw materials.9. The w ord “retained” in the passage is closest in meaning toA. gainedB. establishedC. profited fromD. maintained10. According to paragraph 4, which of the following statements about steam engines is true?A. They were used for the production of paper but not for printing.B. By 1800, significant numbers of them were produced outside of Britain.C. They were used in factories before they were used to power trains.D. They were used in the construction of canals and turnpikes.11. According to paragraph 4, providing a machine to take the place of the horse involved bining which two previously separate ingredients?A. Turnpikes and canalsB. Stationary steam engines and wagons with flanged wheelsC. Metal rails in roadbeds and wagons capable of carrying heavy loadsD. Canal boats and heavily laden wagonsBy 1800 more than a thousand steam engines were in use in the British Isles, and Britain retained a virtual monopoly on steam engine production until the 1830s. Steam power did not merely spin cotton and roll iron; early in the new century, it also multiplied ten times over the amount of paper that a single worker could produce in a day. At the same time, operators of the first printing presses run by steam rather than by hand found it possible to produce a thousand pages in an hour rather than thirty. Steam also promised to eliminate a transportation problem not fully solved by either canal boats or turnpikes. Boats could carry heavy weights, but canals could not cross hilly terrain; turnpikes could cross the hills, but the roadbeds could not stand up under great weights. These problems needed still another solution, and the ingredients for it lay close at hand. In some industrial regions, heavily laden wagons, with flanged wheels, were being hauled by horses along metal rails; and the stationary steam engine was puffing in the factory and mine. Another generation passed before inventors succeeded in bining these ingredients, by putting the engine on wheels and the wheels on the rails, so as to provide a machine to take the place of the horse. Thus the railroad age sprang from what had already happened in the eighteenth century.I Watt's steam engine soon showed what it could do.| It liberated industry from dependence on running water. (The engine eliminated water in the mines by driving efficient pumps, which made possible deeper and deepermining. (The ready availability of coal inspired William Murdoch during the 1790s to develop the first new formof nighttime illumination to be discovered in a millennium and a half. Coal gas rivaled smoky oil lamps and flickering candles, and early in the new century, well-to-do Londoners grew accustomed to gaslit houses and even streets. Iron manufacturers, which had starved for fuel while depending on charcoal, also benefited from ever-increasing supplies of coal: blast furnaces with steam-powered bellows turned out more iron and steel for the new machinery. Steam became the motive force of the Industrial Revolution as coal and iron ore were the raw materials.12. Look at the four squares [(] that indicate where the following sentence could be added to the passage. Where would the sentence best fit?The factories did not have to go to the streams when power could e to the factories.13. Directions: An introductory sentence for a brief summary of the passage is provided below. plete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points. The Industrial Revolution would not have been possible without a new source of power that was efficient, movable, and continuously available.A. In the early eighteenth century, Savery and Newen discovered that expanding steam could be used to raise a piston in a cylinder.B. Watt’ s steam engine played a leading role in greatly increasing industrial production of all kinds.C. Until the 1830s, Britain was the world’ s major producer of steam engines.D. In the mid-1700s James Watt transformed an inefficient steam pump into a fast, flexible, fuel-efficient engine.E. In the 1790s William Murdoch developed a new way of lighting houses and streets using coal gas.F. The availability of steam engines was a major factor in the development of railroads, which solved a major transportation problem.。

托福tpo2阅读文本翻译及解析整理(完整版)

智课网TOEFL备考资料托福tpo2阅读文本翻译及解析整理(完整版)摘要：托福tpo2阅读文本翻译及解析整理(完整版)!托福TPO内容是同学们备考时必不可少的，但是很多学生的TPO内容都不是很全，一些同学最近不断问小编要托福tpo2阅读文本翻译及解析内容，今天就索性将这些内容给整理出来同学们可以一键打包下载。

托福阅读在托福四大项中还是比较容易得分的一项，因此同学们想得高分就要熟悉阅读常考题目及设置的题型，这些就离不开对真题的了解，TPO内容全部来自历年真题，这里特给出了托福tpo2阅读文本翻译及解析整理(完整版)资料，同学们有需要的快来获取吧!扫码立即获取托福tpo2阅读文本翻译及解析整理(完整版)资料：托福tpo2阅读文本翻译及解析具体内容如下：PO2-1-1 原文：The Origins Of CetaceansIt should be obvious that cetaceans-whales, porpoises, and dolphins-are mammals. They breathe through lungs, not through gills, and give birth to live young. Their streamlined bodies, the absence of hind legs, and the presence of a fluke1 and blowhole2 cannot disguise their affinities with land dwelling mammals. However, unlike the cases of sea otters and pinnipeds (seals, sea lions, and walruses, whose limbs are functional both on land and at sea), it is not easy to envision what the first whales looked like. Extinct but already fully marine cetaceans are known from the fossil record. How was the gap between a walking mammal and a swimming whale bridged? Missing until recently were fossils clearly intermediate, or transitional, between land mammals and cetaceans.Very exciting discoveries have finally allowed scientists to reconstruct the most likely origins of cetaceans. In 1979, a team looking for fossils in northern Pakistan found what proved to be the oldest fossil whale. The fossil was officially named Pakicetus in honor of the country where the discovery was made. Pakicetus was found embedded in rocks formed from river deposits that were 52 million years old. The river that formed these deposits was actually not far from an ancient ocean known as the Tethys Sea.The fossil consists of a complete skull of an archaeocyte, an extinct group of ancestors of modern cetaceans. Although limited to a skull, the Pakicetus fossil provides precious details on the origins of cetaceans. The skull is cetacean-like but its jawbones lack the enlarged space that is filled with fat or oil and used for receiving underwater sound in modern whales. Pakicetus probably detected sound through the ear opening as in land mammals. The skull also lacks a blowhole, another cetacean adaptation for diving. Other features, however, show experts that Pakicetus is a transitional form between a group of extinct flesh-eating mammals, the mesonychids, and cetaceans. It has been suggested that Pakicetus fed on fish in shallow water and was not yet adapted for life in the open ocean. It probably bred and gave birth on land.Another major discovery was made in Egypt in 1989. Several skeletons of another early whale, Basilosaurus, were found in sediments left by the Tethys Sea and now exposed in the Sahara desert. This whale lived around 40 million years ago, 12 million years after Pakicetus. Many incomplete skeletons were found but they included, for the first time in an archaeocyte, a complete hind leg that features a foot with three tiny toes. Such legs would have been far too small to have supported the 50-foot-long Basilosaurus on land. Basilosaurus was undoubtedly a fully marine whale with possibly nonfunctional, or vestigial, hind legs...1. In paragraph 1, what does the author say about the presence of a blowhole in cetaceans? It clearly indicates that cetaceans are mammals.It cannot conceal the fact that cetaceans are mammals.It is the main difference between cetaceans and land-dwelling mammals.It cannot yield clues about the origins of cetaceans.2. Which of the following can be inferred from paragraph 1 about early sea otters?It is not difficult to imagine what they looked likeThere were great numbers of them.They lived in the sea only.They did not leave many fossil remains.参考答案1、22、13、34、35、16、27、48、49、210. 311. 412. 213. 1 2 5答案解析：第一题，B，细节题。

【威学教育】王鑫托福阅读TPO31-2阅读文本

【王鑫托福阅读】托福TPO全集之TPO31-2TPO31TPO31-2 Early Childhood Education1. According to paragraph 1, parents in Japan tend to think of preschool primarily as a place where children canA. Get a good academic startB. Expand their emotional developmentC. Become more independentD. Experience being part of a group2. The word “whereas” in the passage is closest in meaning toA. AlthoughB. BecauseC. MoreoverD. already3. The word “focus” in the passage is closest in meaning to A.ConsiderB. RespectC. ConcentrateD. Advise4.It can be inferred from paragraph 2 that the Head Start program was designed to serve children whoA. Come from families that do not have a lot of moneyB. Are not doing very well in kindergartenC. Were born in the 1950sD. Need programs that focus primarily on social and emotional factorsPreschools 一 educational programs for children under the age of five - differ significantly from one country to another according to the views that different societies hold regarding the purpose of early childhood education. For instance, in a cross-country comparison of preschools in China, Japan, and the United States, researchers found that parents in the three countries view the purpose of preschools very differently. Whereas parents in China tend to see preschools primarily as a way of giving children a good start academically, Japanese parents view them primarily as a way of giving children the opportunity to be members of a group. In the United States, in comparison, parents regard the primary purpose of preschools as making children more independent and self-reliant, although obtaining a good academic start and having group experience are also important.While many programs designed for preschoolers focus primarily on social and emotional factors, some are geared mainly toward promoting cognitive gains and preparing preschoolers for the formal instruction they will experience when they start kindergarten. In the United States, the best-known program designed to promote future academic success is Head Start. Established in the 1960s when the United States declared the War on Poverty, the program has served over 13 million children and their families. The program, which stresses parental involvement, was designed to serve the “whole child”, including children's physical health, self-confidence, social responsibility, and social and emotional development.1. According to paragraph 3, the Head Start program had NOT been successful at which of the following?A. Helping children adjust to schoolB. Providing long-term increase in IQ scoresC. Improving school performance throughout high schoolD. Preventing children from being placed in special-education classes6.In paragraph 4, the author mentions the “results from other types of readiness programs ” toA. Provide support for the idea that preschool readiness programs have been somewhat successfulB. Question the idea that Head Start is more effective than other preschool readiness programsC. Indicate school completion is usually the most reliable indicator of success in most readiness programsD. Emphasize that participating in readiness programs can be increased if costs are reduced7. According to paragraph 4, a cost-benefit analysis of one preschool readiness program revealed that A Only one dollar's worth of benefit was gained for every seven dollars spent on the program B The benefits of the program lasted only until the participants reached age 27C Taxpayers saved seven dollars for every dollar spent on the programD To be successful, the program would need to receive about seven times as much money as it currently receivesWhether Head Start is seen as successful or not depends on the lens through which one is looking. If, for instance, the program is expected to provide long-term increases in IQ (intelligence quotient) scores, it is a disappointment. Although graduates of Head Start programs tend to show immediate IQ gains, these increases do not last. On the other hand, it is clear that Head Start is meeting its goal of getting preschoolers ready for school. Preschoolers who participate in Head Start are better prepared for future schooling than those who do not. Furthermore, graduates of Head Start programshave better future school grade. Finally, some research suggests that ultimately Head Start graduates show higher academic performance at the end of high school, although the gains are modest.In addition,results from other types of preschoolreadinessprogramsindicate that those whoparticipate and graduate are less likely to repeat grades, and they are more likely to complete school than readiness program, for every dollar spent on the program, taxpayers saved seven dollars by the time the graduates reached the age of 27.8. The word “ comprehensive ” in the passage is closest in meaning toA. Easily understoodB. ThoroughC. RespectableD. Objective9. Paragraph 5 mentions that participants in early intervention programs have been shown to do all of the following better than nonparticipants EXCEPTA. Take care of their healthB. Support themselves financiallyC. Take care of their own childrenD. Have increased emotional development10. According to paragraph 5, which of the following is true about the benefits of early intervention programs?A. These programs produce good short-term benefits but few long-term benefits.B. Only the most expensive programs provide substantial benefits.C. The Head Start program provides a range of benefits that no other program can provide.D. Some children benefit more than others do from these programs.11. The word “seek” in the passage is closest in meaning toA. ClaimB. ManageC. FailD. Attempt12. The passage mentions “ developmental psychologist David Elkind” in order toA. Give an example of an expert who has designed an effective early childhood education programB. Introduce an alternative view about the value of early childhood educationC. Explain why early childhood education programs are less effective in the United States than in other countriesD. Refute the claim that academic success is dependent on factors outside parents’ control.The most recent comprehensive evaluation of early intervention programs suggests that, taken as a group, preschool programs can provide significant benefits, and that government funds invested early in life may ultimately lead to a reduction in future costs. For instance, compared with children who did not participate in early intervention programs, participants in variousprograms showed gains in emotional or cognitive development, better educational outcomes, increased economic self-sufficiency, reduced levels of criminal activity, and improved health-related behaviors. Of course, not every program produced all these benefits, and not every child benefited to the same extent. Furthermore, some researchers argue that less-expensive programs are just as good as relatively expensive ones, such as Head Start. Still, the results of the evaluation were promising, suggesting that the potential benefits of early intervention can be substantial.Not everyone agrees that programs that seek to enhance academic skills during the preschool years are a good thing. In fact, according to developmental psychologist David Elkind, United States society tends to push children so rapidly that they begin to feel stress and pressure at a young age. Elkind argues that academic success is largely dependent upon factors out of parents’ control, such as inherited abilities and a child’s rate of maturation. Consequently, children of a particular age cannot be expected to master educational material without taking into account their current level of cognitive development. In short, children require development appropriate educational practice, which is education that is based on both typical development and the unique characteristics of a given child.Not everyone agrees that programs that seek to enhance academic skills during the preschool years are a good thing. _n fact, according to developmental psychologist David Elkind, United States society tends to push children so rapidly that they begin to feel stress and pressure at a young age. ■Elkind argues that academic success is largely dependent upon factors out of parents’ control, such as inherited abilities and a child’ s rate of maturation. ■Consequently, children of a part icular age cannot be expected to master educational material without taking into account their current level of cognitive development. _n short, children require development appropriate educational practice, which is education that is based on both typical development and the unique characteristics of a given child.13. Look at the squares [■] that indicate where following sentence can be added to the passage. Where would the sentence best fit?According to Elkind, not only does this cause the child emotional distress, it also fails to bring the intended cognitive gains.14. Prose Summary. Preschool programs provide opportunities for young children to develop socially, emotionally, and cognitively.Answer ChoicesA. In addition to stressing academic development, preschools should be enjoyable, since studies show that children benefit from programs they find fun.B. Preschool programs such as Head Start have been shown to help prepare children for school and may also have long-term benefits in helping children become effective adults.C. Studies have shown that preschool programs are most effective when they focus on only one area of development rather than trying to serve the “whole child” .D. The primary purpose of preschool programs varies by country, with some stressing the importance of group experience, and others self-reliance or getting a good academic start.E. Critics of preschool programs argue that these programs put undue pressure on children and may not be effective if children are not developmentally ready for academic work.F. David Elkind is a critic of publicly funded preschool programs, arguing that the parent cannot control their children’ s emotional development.。

托福阅读tpo52R-2原文+译文+题目+答案+背景知识

TPO52阅读-2 Natufian Culture原文 (1)译文 (2)题目 (3)答案 (8)背景知识 (10)原文Natufian Culture①In the archaeological record of the Natufian period, from about 12,500 to 10,200 years ago, in the part of the Middle East known as the Levant - roughly east of the Mediterranean and north of the Arabian Peninsula -we see clear evidence of agricultural origins. The stone tools of the Natufians included many sickle-shaped cutting blades that show a pattern of wear characteristic of cereal harvesting. Also, querns (hand mills) and other stone tools used for processing grain occur in abundance at Natufian sites, and many such tools show signs of long, intensive use. Along with the sickle blades are many grinding stones, primarily mortars and pestles of limestone or basalt. There is also evidence that these heavy grinding stones were transported over long distances, more than 30 kilometers in some cases, and this is not something known to have been done by people of preceding periods. Fishhooks and weights for sinking fishing nets attest to the growing importance of fish in the diet in some areas. Stone vessels indicate an increased need for containers, but there is no evidence of Natufian clay working or pottery. Studies of the teeth of Natufians also strongly suggest that these people specialized in collecting cereals and may have been cultivating them and in the process of domesticating them, but they were also still hunter-foragers who intensively hunted gazelle and deer in more lush areas and wild goats and equids in more arid zones.②The Natufians had a different settlement pattern from that of their predecessors. Some of their base camps were far larger (over 1,000 square meters) than any of those belonging to earlier periods, and they may have lived in some of these camps for half the year or even more. In some of the camps, people made foundations and other architectural elements out of limestone blocks. Trade in shell, obsidian, and other commodities seems to have been on the rise, and anthropologists suspect that the exchange of perishables (such as skins, foodstuffs) and salt was also on the increase. With the growing importance of wild cereals in the diet, salt probably became for the first time a near necessity: people who eat a lot of meat get many essential salts from this diet, but diets based on cereals can be deficient in salts. Salt was probably also important as a food preservative inearly villages.③As always, there is more to a major cultural change than simply a shift in economics. The Natufians made (and presumably wore) beads and pendants in many materials, including gemstones and marine shells that had to be imported, and it is possible that this ornamentation actually reflects a growing sense of ethnic identity and perhaps some differences in personal and group status. Cleverly carved figurines of animals, women, and other subjects occur in many sites, and Natufian period cave paintings have been found in Anatolia, Syria, and Iran. More than 400 Natufian burials have been found, most of them simple graves set in house floors. As archaeologist Belfer-Cohen notes, these burials may reflect an ancestor cult and a growing sense of community emotional ties and attachment to a particular place, and toward the end of the Natufian period, people in this area were making a strict separation between living quarters and burial grounds. In contrast with the Pleistocene cultures of the Levant, Natufian culture appears to have experienced considerable social change.④The question of why the Natufians differed from their predecessors in these and other ways and why they made these first steps toward farming as a way of life remains unclear. There were climate changes, of course, and growing aridity and rising population densities may have forced them to intensify the exploitation of cereals, which in turn might have stimulated the development of sickles and other tools and the permanent communities that make agriculture efficient. But precisely how these factors interacted with others at play is poorly understood.译文纳图夫文化①从大约12500至10200年之前的纳图夫时期的考古记载中，在被称作黎凡特(Levant) 的中东地区（大致在地中海以东，阿拉伯半岛以北），我们看到了确切的农业起源证据。

【威学教育】王鑫托福阅读TPO25-1阅读文本

【王鑫托福阅读】托福TPO全集之TPO25-1TPO25TPO25-1 The surface of Mars1. The word meaning to A Important B Extremely large C Highly unusual D Activeenormous” in the passage is closest in2. According to paragraph 1, Olympus Mons differs from volcanoes on the Tharsis bulge in that Olympus MonsA Has more complex geologic featuresB Shows less impact crateringC Is tallerD Was formed at a later time3. The word meaning to A Deep B Complex C Characteristic D Ancient4. According to paragraphs 1 and 2, which of the following is NOT true of the shield volcanoes on the Tharsis bulge?A They have broad, sloping sides.B They are smaller than the largest volcano on Mars.C They have channels that resemble the lava channels of volcanoes on Earth.D They are over 25 kilometers tall.The surface of Mars shows a wide range of geologic features, including huge volcanoes-the largest known in the solar system-and extensive impact cratering. Three very large volcanoes are found on the Tharsisbulge, an enormous geologic area near Mars's equator. Northwest of Tharsis is the largest volcano of all: Olympus Mons, with a height of 25 kilometers and measuring some 700 kilometers in diameter at its base. The three large volcanoes on the Tharsis bulge are a little smaller-a “mere” 18 kilometers high.None of these volcanoes was formed as a result of collisions between plates of the Martian crust-there is no plate motion on Mars. Instead, they are shield volcanoes — volcanoes with broad, sloping slides formed by molten rock. All four show distinctivelava channels and other flow features similar to those found on shield volcanoes on Earth. Images of the Martian surface reveal many hundreds of volcanoes. Most of the largest volcanoes are associated with the Tharsis bulge, but many smaller ones are found in the northern plains.5. The word “roughly” in the passage is closest in meaning toA TypicallyB FrequentlyC ActuallyD Approximately6. In paragraph 3, why does the author compare Maxwell Mons on Venus to the Hawaiian shield volcanoes on Earth?A To help explain the relationship between surface gravity and volcano heightB To explain why Mars's surface gravity is only 40 percent of Earth'sC To point out differences between the surface gravity of Earth and the surface gravity of VenusD To argue that there are more similarities than differences between volcanoes on different planetsThe great height of Martian volcanoes is a direct consequence of the planet's low surface gravity. As lava flows and spreads to form a shield volcano, the volcano's eventual height depends on the new mountain's ability to support its own weight. The lower the gravity, the lesser the weight and the greater the height of the mountain. It is no accident that Maxwell Mons on Venus and the Hawaiian shield volcanoes on Earth rise to about the same height (about 10 kilometers) above their respective bases-Earth and Venus have similar surface gravity. Mars's surface gravity is only 40 percent that of Earth, sovolcanoes rise roughly 2.5 times as high. Are the Martian shield volcanoes still active? Scientists haveno direct evidence for recent or ongoing eruptions,but if these volcanoes were active as recently as 100million years ago (an estimate of the time of laseruption based on the extent of impact cratering on7. Which of the sentences below best expresses tlermittently active. Millions of years, though, maypass between eruptions. ▼essential information in the highlighted senten the passage? Incorrect choices change the meaning in important ways or leave out essential information A Although direct evidence of recent eruptions is lacking, scientists believe that these volcanoes were active as recently as 100 million years ago.B Scientists estimate that volcanoes active more recently than 100 years ago will still have extensive impact cratering on their slopes.C If, as some evidence suggests, these volcanoes erupted as recently as 100 million years ago, they may continue to be intermittently active.D Although these volcanoes were active as recently as 100 million years ago, there is no direct evidence of recent or ongoing eruptions.their slopes), some of them may still be at leas8. The word “considerably” in the passage is closest in meaning toA FrequentlyB SignificantlyC ClearlyD Surprisingly9. According to paragraph 4, what is demonstrated by the fact that craters fill in much faster on Mars than on the Moon? A Erosion from meteoritic impacts takes place more quickly on Mars than on the Moon.B There is more dust on Mars than on the Moon.C The surface of Mars is a dry desert.D Wind is a powerful eroding force on Mars.10. In paragraph 4, why does the author point out that Mars has few ancient craters that are less than 5 kilometers in diameter?A To explain why scientists believe that the surface matter filling Martian craters is mostly dustB To explain why scientists believe that the impact craters on Mars were created by meteoroidsC To support the claim that the Martian atmosphere is an efficient erosive agentD To argue that Mars experienced fewer ancient impacts than the Moon did11. According to paragraph 5, what have scientists been able to determine from studies of large impact cratering on Mars?A Some Martian volcanoes are much older than was once thought.B The age of Mars's surface can vary from area to area.C Large impact craters are not reliable indicators of age in areas with high volcanic activity.D Some areas of the Martian surface appear to be older than they actually are.Another prominent feature of Mars's surface is cratering. The Mariner spacecraft found that the surface of Mars, as well as that of its two moons, is pitted with impact craters formed by meteoroids falling in from space. As on our Moon, the smaller craters are often filled with surface matter-mostly dust-confirming that Mars is a dry desert world. However, Martian craters get filledinconsiderablyfaster than their lunar counterparts. On the Moon, ancient craters less than 100 meters across (corresponding to depths of about 20 meters) have been obliterated, primarily by meteoritic erosion. On Mars, there are relatively few craters less than 5 kilometers in diameter. The Martianatmosphere is an efficient erosive agent, with Martian winds transporting dust from place to place and erasingr^rsurface features much faster than meteoritic impacts alone can obliterate them.As on the Moon, the extent of large impact cratering (i.e. craters too big to have been filled in by erosion since they were formed) serves as an age indicator for the Martian surface. Age estimates ranging from four billion years for Mars's southern highlands to a few hundred million years in the youngest volcanic areas were obtained in this way.12. According to paragraph 6, the ejecta of Mars's crater Yuty differs from the ejecta of the Moon's Copernicus crater in that the ejecta of the Yuty crater A Has now become part of a permafrost layer B Contains a large volume of dust, soil and boulders C Suggests that liquid once came out of the surface at the crater siteD Was thrown a comparatively long distance from the center of the craterThe detailed appearance of Martian impact craters provides an important piece of information about conditions just below the planet's surface. Martian craters are surrounded by ejecta (debris formed as a result of an impact) that looks quite different from its lunar counterparts. A comparison of the Copernicus crater on the Moon with the (fairly typical) crater Yuty on Mars demonstrates the differences. The ejecta surrounding the lunar crater is just what one would expect from an explosion ejecting a large volume of dust, soil, and boulders. However, the ejecta on Mars gives the distinct impression of a liquid that has splashed or flowed out of crater. Geologists think that this fluidized ejecta crater indicates that a layer of permafrost, or water ice, lies just a few meters under the surface. Explosive impacts heated and liquefied the ice, resulting in the fluid appearance of the ejecta.mThe detailed appearance of Martian impact craters provides an important piece of information about conditions just below the planet's surface. Martiancraters are surrounded by ejecta (debris formed as a result of an impact) that looks quite different from its lunar counterparts. A comparison of the Copernicus crater on the Moon with the (fairly typical) crater Yuty on Mars demonstrates the differences. The ejecta surrounding the lunar crater is justwhat one would expect from an explosion ejecting a large volume of dust, soil, and boulders.| However, theejecta on Mars gives the distinct impression of a liquid that has splashed or flowed out of crater. | Geologists think that this fluidized ejecta crater indicates that a layer of permafrost, or water ice, lies just a few meters underthe surface. | Explosive impacts heated and liquefied the ice, resulting in the fluid appearance of the ejecta.13. Look at the four squares [| ] that indicate where the following sentence could be added to the passage. Where would the sentence best fit? Click on a square to add the sentence to the passage.This surface feature has led to speculation about what may lie under Mars's surface.14. Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points. Volcanoes and impact craters are major features of Martian geology.A. Plate motion on Mars, once considered to have played no role in shaping the planet's surface, is now seen as being directly associated with the planet's earliest volcanoes.B. Mars has shield volcanoes, some of which are extremely tall because of the planet's low surface gravity.C. Although the erosive power of the Martian atmosphere ensures that Mars has fewer craters than the Moon does, impact craters are prominent on Mars' s surface.D. Scientists cannot yet reliably estimate the age of the Martian surface because there has been too much erosion of it.E. Scientists have been surprised to discover that conditions just below the surface of Mars are very similar to conditions just below the surface of the MoonF. Studies of crater ejecta have revealed the possibility of a layer of permafrost below the surface of Mars.。

【威学教育】王鑫托福阅读TPO25-2阅读文本

【王鑫托福阅读】托福TPO全集之TPO25-2TPO25TPO25-2 The Decline of Venetian Shipping1. The word “resurgence” in the passage is closest in meaning toA transformationB comebackC programD expansion2. The word “compulsorily” in the passage is closest in meaning toA for freeB for a timeC by requirementD by design3. According to paragraph 2, which of the following contributed to the decline of Venetian shipping?A The loss of trade in Adriatic SeaB The move from galleys to round shipsC The decreased demand for galleysD The doubling of sailor's wages4. All of the following are mentioned in paragraph 2 as ways that Venice provided rowers for its galley EXCEPT A Requiring business associations to provide sailorsB Recruiting sailors from other cities in northern ItalyC Drafting Venetian citizens into services as rowersD Appealing to the traditions of Venice as a sea power.In the late thirteenth century, northern Italian cities such as Genoa, Florence, and Venice began an economic resurgence that made them into the most important economic centers of Europe. By the seventeenth century, however, other European powers had taken over, as the Italian cities lost much of their economic might.This decline can be seen clearly in the changes that affected Venetian shipping and trade. First, Venice's intermediary functions in the Adriatic Sea, where it had dominated the business of shipping for other parties, were lost to direct trading. In the fifteenth century there was little problem recruiting sailors torow the galleys (large ships propelled by oars): guilds (business associations) were required to provide rowers, and through a draft system free citizens served compulsorily when called for. In the early sixteenth century the shortage of rowers was not serious because the demand for galleys was limited by a move to round ships (round-hulled ships with more cargo space), with required fewer rowers. But theshortage of crews proved to be a greater and greater problem, despite continuous appeal to Venic's tradition of maritime greatness. Even though sailors' wages doubled among the northern Italian cities from 1550 to 1590, this did not elicit an increased supply.and g )wly5. The word meaning to A strictB enforcedC improvedD old-fashioned6. According to paragraphs 3, why did the building of ships in Venetian shipyards become increasingly expensive?A The wages of officers and workers in the Arsenale kept risingB Roman shipyards were using all the available fir trees for the warshipsC The timber used in the shipbuilding had to be brought from farther and farther awayD Venetian standards required that shipbuilders use top-quality materials.7. All of the following are mentioned in paragraph and 4 as contributing to the problems of the Venetian shipbuilding industry at the end of the sixteenthoutdated” in the passage is closest incentury EXCEPT A The quality of work performed in the Arsenale had declinedB Venetian-built ships were heavy and generally inefficientC Arsenale shipbuilders worked more slowD Only a few merchants controlled the buying and selling of most of the Venetian-built shipsThe problem in shipping extended to the Arsenale, Venice's huge and powerful shipyard. Timber ran short, and it was necessary to procure it from farther and farther away. In ancient Roman times, the Italian peninsula had great forest of fir preferred for warships, but scarcity was apparent as early as the early fourteenth century. Arsenale officers first brought timber from the foothills of the Alps, then from north toward Trieste, and finally from across the Adriatic. Private shipbuilders were required to buy their oak abroad. As the costs of shipbuilding rose, Venice clung to its outdated standard while the Dutch were innovation in the lighter and more easily handled ships.10. Why does the author mention “Vasco da Gama' around southern Africa to India took place at the endof the fifteenth century, and by 1502 the trans- Abrabian caravan route had been cut off by political unrest.Voyage around southern Africa to India” in the passage?A to indicate how the Portuguese came to challenge Venetian dominance of trade with the EastB to explain why political troubles resulted in the closing of the usual routes to IndiaC to prove that Venetians could not sail round ships as efficiently as sailors from other countries didD to show that Venetian reliance on round ships rather than galleys proved to be weakness8. Which of the sentences below best expresses the essential information in the highlighted sentence in the passage?Incorrect choices change the meaning in important ways or leave out essential information.A The loss of ships in battle at the end of the sixteenth century showed that Venetian shipbuilders lacked the skills they had possessed at the beginning of the century.B Venetian shipbuilding failed to quickly replace the ships lost in battle at the end of the sixteenth century as it would have done earlier in the century.C Frederic Lane noted that Venice lost ships in battle at the end of the sixteenth century, showing that Venetian shipbuilding was not longer known for its reliability.D Venetian shipbuilding had been known for its high quality of work at the beginning of the sixteenth century, but toward the end of the century Venetian ships were poorer in quality.9. The word “conventional” in the passage is closest meaning to A informalB logicalC correctD usualThe step from buying foreign timber to buying foreign ships was regarded as a short one, especially when complaints were heard in the latter sixteenth century that the standards and traditions of the Arsenale were running down. Work was stretched out and done poorly. Older workers had been allowed to stop work a half hour before the regular time, and in 1601 younger works left with them. Merchants complained that the privileges reserved for Venetian-built and owned ships were first extended to those Venetians who bought ships from abroad and then to foreign-built and owned vessels. Historian FredericLane observes that after the loss of ships in battle inthe late sixteenth century, the shipbuilding industryno longer had the capacity to recover that it haddisplayed at the start of the century.conventional explanation for the loss of Venetian dominance in trade is establishment of the Portuguese direct sea route to the East, replacing the overland Silk Road from the Black sea and the highly profitable IndianOcean-caravan-eastern Mediterranean route to Venice. The Portuguese Vasco da Gama's Voyage11. Which of the following can be inferred from paragraph 6 about the Venetian Council's decision concerning the use of round ships?A It resulted in a return to profitable in luxury goods for Venetian merchants.B Ultimately it did not restore the superiority in the spice trade that Venice had enjoyed earlier.C It eventually enabled Venetian merchants to increase the quantity and price of the spices they sold in Europe.D It means a long-awaited improvement in the fortunes of the shipbuilding industry in Venice.12. According to paragraphs 6, in the sixteenth century the price of spices declined becauseA France and Germany established monopolies and dictated pricesB Venetian merchant galleys competed with Venetian round ships for the spice tradeC More spices were available because both the Venetians and the Portuguese were importing themD Increased demand for silk, dyes, cotton and gold meant that people had less money to spend on spiices.The Venetian Council finally allowed round ships to enter the trade that was previously reserved for merchant galleys, thus reducing transport cost by one third. Prices of spices delivered by ship from the eastern Mediterranean came to equal those of spices transported by Paortuguese vessels, but the increase in quantity with both routes in operation drove the price far down. Gradually, Venice's role as a storage and distribution center for spices and silk, dyes cotton, and gold decayed, and by the early seventeenth century Venice had lost its monopoly in markets such as France and southern Germany.Venetian shipping had started to decline from about 1530-before the entry into the Mediterranean of large volumes of Dutch and British shipping-and was clearly outclassed by the end of the century. A contemporary of Shakespeare (1564-1616) observed that theVenetian shipping had started to decline from about 1530-before the entry into the Mediterranean of large volumes of Dutch and British shipping-and was clearly outclassed by the end of the century. A contemporary of Shakespeare (1564-1616) observed that the productivity of Italian shipping had declined, compared with that of the British, because of conservatism and loss of expertise. Moreover, Italian sailors were deserting and emigrating, and captains, no longer recruited from the ranks of nobles, were weak on navigations.This decline can be seen clearly in the changes that affected Venetian shipping and trade. First, Venice's intermediary functions in the Adriatic Sea, where it had dominated the business of shipping for other parties, were lost to direct trading. In the fifteenth century there was little problem recruiting sailors to row the galleys (large ships propelled by oars): guilds (business associations) were required to provide rowers, and through a draft system free citizens served compulsorily when called for. | In the early sixteenth century the shortage of rowers was not serious because the demand for galleys was limited by a move to round ships (round-hulled ships with more cargo space), with required fewer rowers. | But the shortage of crews proved to be a greater and greater problem, despite continuous appeal to Venic's tradition of maritime greatness.| Even though sailors' wages doubled among the northern Italian cities from 1550 to 1590, this did not elicit an increased supply.|13. Look at the four squares [| ] that indicate where the following sentence could be added to the passage. Where would the sentence best fit? Click on a square to add the sentence to the passage.The increase in reward still did not attract young people to this hard life, and convicted criminals and slaves were pressed into services.14. Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do notbelong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points. The loss of power and prestige of Italian cities by the sixteenth century is clearly seen in the decline of Venetian shipping.A. Venetian ships were famous for carrying large cargoes of spices and luxury goods around the world in fast, oar-driven galleys.B. Venetian round ships bringing spices and silk from the East helped drive prices down so that ordinary people could afford to buy themC. A shortage of timber for building the traditional galleys and a lack of sailors to row them meant a loss of Venetian shipping business.D. Venice failed to keep up with improvement in ship design, and the cost of shipbuilding rose a quality and efficiency declined.E. The Venetian Council made sure that Venetian-built and Eowned ships kept special privileges in transporting luxury goods in and out of Venice.F. The Portuguese direct sea route to the East adversely affected Venetian trade, and Venice fell behind the Dutch and the British in the quality of their ships and sailing skills.。

【威学教育】王鑫托福阅读TPO24-2阅读文本

【王鑫托福阅读】托福TPO全集之TPO24-2TPO24TPO24-2 Breathing During Sleep1. According to paragraph 1, which of the following can be inferred about the diaphragm during sleep?A During sleep the diaphragm requires increased movement of the rib cage.B The diaphragm helps with breathing as movements of the rib cage decrease during sleep.C The diaphragm requires a great amount of pressure to function properly.D The diaphragm contributes to the effective functioning of the rib cage.2. According to paragraph 2, all of the following are true of the voluntary breathing system EXCEPT:A It has its control center in the brain stem.B It controls breathing for a number of activiti during wakefulness. ▲C It is able to bypass the automatic system.D It produces an irregular breathing pattern.^ mmOf all the physiological differences in human sleep compared with wakefulness that have been discovered in the last decade, changes in respiratory control are most dramatic. Not only are there differences in the level of the functioning of respiratory systems, there are even changes in how they function.Movements of the rib cage for breathing are reduced during sleep, making the contractions of the diaphragm more important. Yet because of the physics of lying down, the stomach applies weight against the diaphragm and makes it more difficult for the diaphragm to do its job. However, there are many other changes that affect respiration通 1 1"when asleep.During wakefulness, breathing is controlled by two interacting systems. The first is an automatic,,毳.metabolic system whose control is centered in thebrain stem. It subconsciously adjusts breathing rate wand depth in order to regulate the levels of carbon dioxide (CO2) and oxygen (O2), and the acid-base ratio in the blood. The second system is the voluntary, behavioral system. Its control center is based in the forebrain, and it regulates breathing for use in speech, singing, sighing, and so on. It is capable of ignoring or overriding the automatic, metabolic system and produces an irregular pattern of breathing.3. The word exclusive in the passage is closest in meaning toA consistentB perfectC partialD sole4. According to paragraph 3, which of the following may occur just before NREM sleep begins?A The automatic, metabolic system may increase its dependence on air exchanges.B Breathing can stop for a short time as a person falls asleep.C An increase in the oxygen level in the blood can occur as sleep becomes fully obtained.D The level of carbon dioxide in the blood may drop suddenly.5. What is the author's purpose in stating that inhaling is like sucking air out of a balloon?A To refute the argument that additional effo necessary for breathing during sleepB To argue that REM sleep is more important than NREM sleepC To illustrate the difficulty of breathing during sleepD To illustrate how blockage of narrow passages can be prevented during sleep6. All of the following are mentioned in paragraph 4 as being characteristic of breathing during sleep EXCEPT A relaxation of the muscles involved in the respiratory systemB changes in resistance between the two sides of the noseC easier airflow in the passages of the upper airwayD absence of certain complex muscle interactionsDuring NREM (the phase of sleep in which there is no rapid eye movement) breathing becomes deeper and more regular, but there is also a decrease in the breathing rate, resulting in less air being exchanged overall. This occurs because during NREM sleep theautomatic, metabolic system has exclusive control over breathing and the body uses less oxygen and produces less carbon dioxide. Also, during sleep the automatic metabolic system is less responsive to carbon dioxide levels and oxygen levels in the blood. Two things result from these changes in breathing control that occur during sleep. First, there may be a brief cessation or reduction of breathing when falling asleep as the sleeper waxes and wanes between sleep and wakefulness and their differing control mechanisms. Second, once sleep is fully obtained, there is an increase of carbon dioxide and a decrease of oxygen in the blood that persists during NREM.V / <S&>But that is not all that changes. During all phases of sleep, several changes in the air passages have been observed. It takes twice as much effort to breathe during sleep because of greater resistance to airflow in the airways and changes in the efficiency of the muscles used for breathing. Some of the muscles that help keep the upper airway open when breathing tend to become more relaxed during sleep, especially during REM (the phase of sleep in which there is rapid eye movement). Without this muscular action,inhalingis like sucking air out of a balloon—the narrowpassages tend to collapse. Also there is a regular cycle of change in resistance between the two sides of the nose. If something blocks the "good" side, such as congestion from allergies or a cold, then resistance increases dramatically. Coupled with these factors is the loss of the complex interactions among the muscles that can change the route of airflow from nose to mouth.7. According to paragraph 5, what happens during NREM sleep when inhaling is difficult?A There is an immediate, automatic, adaptive increase in breathing effort.B The sleeping person takes several inadequate breaths before the breathing effort is adjusted.C The coughing reflex causes the breathing effort to adjust.Other respiratory regulating mechanisms apparently cease functioning during sleep. For example, during wakefulness there is an immediate, automatic, adaptive increase in breathing effort when inhaling is made more difficult (such as breathing through a restrictive face mask). This reflexive adjustment is totally absent during NREM sleep. Only after several inadequate breaths under such conditions, resulting inD The airways become cleared as the blood removestheconsiderableelevation of carbon dioxide andairway, then resume breathing and likely return toresume in the passage is closestirritants.8. It can be inferred from paragraph 5 that a very mild irritation during sleep will likely cause the sleeping person toA increase the breathing effortB wake up and remove the source of irritationC cough while still sleepingD stop breathing temporarily while still sleeping9. The word considerable meaning to A significantB SteadyC UsualD necessary10. The word meaning to A reduce B stop C Readjust D restartreduction of oxygen in the blood, is breathing effort adjusted. Finally, the coughing reflex in reaction to irritants in the airway produces not a cough during sleep but a cessation of breathing. If the irritation is severe enough, a sleeping person will arouse, clear the11. Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information.A Because breathing is more shallow and irregular in REM than in NREM, less air is exchanged in REM.B Breathing in NREM is less effective than breathing in REM because of irregular episodes of rapid breathing during NREM.C Because breathing is more rapid in NREM sleep than in REM sleep, breathing often becomes shallow.D Although REM has brief episodes of shallow breathing or lack of breathing, breathing is more rapid than in NREM.Additional breathing changes occur during REM sleep that are even more dramatic than the changes thatoccur during NREM. The amount of air exchanged iseven lower in REM than NREM because, althoughbreathing is more rapid in REM,it is also more irregular,with brief episodes of shallow breathing or absence of breathing. In addition, breathing during REM depends much more on the action of the diaphragm and much less on rib cage action.Of all the physiological differences in human sleep compared with wakefulness that have been discovered in the last decade, changes in respiratory control are most dramatic. Not only are there differences in the level of the functioning of respiratory systems, there are even changes in how they function. Movements of the rib cage for breathing are reduced during sleep, making the contractions of the diaphragm more important. | Yet because of the physics of lying down, the stomach applies weight against the diaphragm and makes it more difficult for the diaphragm to do its job. | However, there are many other changes that affect respiration when asleep.| During wakefulness, breathing is controlled by two interacting systems.| The first is an automatic, metabolic system whose control is centered in the brain stem. It subconsciously adjusts breathing rate and depth in order to regulate the levels of carbon dioxide (CO2) and oxygen (O2), and the acid-base ratio in the blood. The second system is the voluntary, behavioral system. Its control center is based in the forebrain, and it regulates breathing for use in speech, singing, sighing, and so on. It is capable of ignoring or overriding the automatic, metabolic system and produces an irregular pattern of breathing.12. Look at the four squares [| ] that indicate where the following sentence could be added to the passage. Where would the sentence best fit? Click on a square to add the sentence to the passageTo better understand breathing during sleep, it is, however, helpful to first understand how respiration works ingeneral.r13. Directions: From the seven statements below, select the statements that correctly characterize breathing during wakefulness and those statements that correctly characterize breathing during sleep. Drag each answer choice you select into the appropriate box of the table. Two of the answer choices will NOT be used. This question is worth 3 points. 4% HA. The role of the rib cage increases and the role of the diaphragm decreases.B. Carbon dioxide in blood rises and oxygen drops.C. The coughing reflex is extremely complex.D. A great deal of effort is used for breathing.E. Upper airways are resistant to colds and allergies.F. There is a drop in the volume of air that is exchanged.G. Automatic and voluntary respiratory systems are both involved.。

新托福TPO5阅读原文及译文

新托福TPO5阅读原文(一):Minerals and PlantsTPO-5-1：Minerals and PlantsResearch has shown that certain minerals are required by plants for normal growth and development.The soil is the source of these minerals,which are absorbed by the plant with the water from the soil.Even nitrogen,which is a gas in its elemental state,is normally absorbed from the soil as nitrate ions.Some soils are notoriously deficient in micro nutrients and are therefore unable to support most plant life.So-called serpentine soils,for example,are deficient in calcium,and only plants able to tolerate low levels of this mineral can survive.In modern agriculture,mineral depletion of soils is a major concern,since harvesting crops interrupts the recycling of nutrients back to the soil.Mineral deficiencies can often be detected by specific symptoms such as chlorosis(loss of chlorophyll resulting in yellow or white leaf tissue),necrosis (isolated dead patches),anthocyanin formation(development of deep red pigmentation of leaves or stem),stunted growth,and development of woody tissue in an herbaceous plant.Soils are most commonly deficient in nitrogen and phosphorus. Nitrogen-deficient plants exhibit many of the symptoms just described.Leaves develop chlorosis;stems are short and slender,and anthocyanin discoloration occurs on stems,petioles,and lower leaf surfaces.Phosphorus-deficient plants are often stunted,with leaves turning a characteristic dark green,often with the accumulation of anthocyanin.Typically,older leaves are affected first as the phosphorus is mobilized to young growing tissue.Iron deficiency is characterized by chlorosis between veins in young leaves.Much of the research on nutrient deficiencies is based on growing plants hydroponically,that is,in soilless liquid nutrient solutions.This technique allows researchers to create solutions that selectively omit certain nutrients and then observe the resulting effects on the plants.Hydroponics has applications beyond basic research,since it facilitates the growing of greenhouse vegetables during winter. Aeroponics,a technique in which plants are suspended and the roots misted with a nutrient solution,is another method for growing plants without soil.While mineral deficiencies can limit the growth of plants,an overabundance of certain minerals can be toxic and can also limit growth.Saline soils,which have high concentrations of sodium chloride and other salts,limit plant growth,and research continues to focus on developing salt-tolerant varieties of agricultural crops.Research has focused on the toxic effects of heavy metals such as lead,cadmium,mercury,and aluminum;however,even copper and zinc,which are essential elements,can become toxic in high concentrations.Although most plants cannot survive in these soils, certain plants have the ability to tolerate high levels of these minerals.Scientists have known for some time that certain plants,called hyperaccumulators,can concentrate minerals at levels a hundredfold or greater thannormal.A survey of known hyperaccumulators identified that75percent of them amassed nickel,cobalt,copper,zinc,manganese,lead,and cadmium are other minerals of choice.Hyperaccumulators run the entire range of the plant world.They may be herbs,shrubs,or trees.Many members of the mustard family,spurge family, legume family,and grass family are top hyperaccumulators.Many are found in tropical and subtropical areas of the world,where accumulation of high concentrations of metals may afford some protection against plant-eating insects and microbial pathogens.Only recently have investigators considered using these plants to clean up soil and waste sites that have been contaminated by toxic levels of heavy metals–an environmentally friendly approach known as phytoremediation.This scenario begins with the planting of hyperaccumulating species in the target area,such as an abandoned mine or an irrigation pond contaminated by runoff.Toxic minerals would first be absorbed by roots but later relocated to the stem and leaves.A harvest of the shoots would remove the toxic compounds off site to be burned or composted to recover the metal for industrial uses.After several years of cultivation and harvest,the site would be restored at a cost much lower than the price of excavation and reburial, the standard practice for remediation of contaminated soils.For examples,in field trials,the plant alpine pennycress removed zinc and cadmium from soils near a zinc smelter,and Indian mustard,native to Pakistan and India,has been effective in reducing levels of selenium salts by50percent in contaminated soils.译文：TPO-5-1矿物质和植物研究表明，某些矿物质是植物正常生长发育所必需的。

【威学教育王鑫整理出品】托福TPO7-3阅读文本

【王鑫托福阅读】托福TPO7-3阅读文本TPO7TPO7-3 Agriculture Iron and the Bantu Peoplesng this time1. The word “diffused” in the passage is closest in meaning toA. emergedB. was understoodC. spreadD. developed2. According to paragraph 1, why do researchers doubt that agriculture developed independently in Africa?A. African lakes and rivers already provided enough food for people to survive without agriculture.B. The earliest examples of cultivated plants discovered in Africa are native to Asia.C. Africa ’ s native plants are very difficult to domesticate.D. African communities were not large enough to support agriculture.3.In paragraph 1, what does the author imply about changes in the African environment during period?A. The climate was becoming milder, allowing for a greater variety of crops to be grown.B. Although periods of drying forced people south, they returned once their food supply was secure.C. Population growth along rivers and lakes was dramatically decreasing the availability of fish.D. A region that had once supported many people was becoming a desert where few could survive.There is evidence of agriculture in Africa prior to 3000B. C. It may have developed independently, but many scholars believe that the spread of agriculture and iron throughout Africa linked it to the major centers of the Near East and Mediterranean world. The drying up of what is now the Sahara desert had pushed many peoples to the south into sub-Sahara Africa. These peoples settled at first in scattered hunting-and-gathering bands, a lt hough in some places near lakes and rivers, people who fished, with a more secure food supply, lived in larger population concentrations. Agriculture seems to have reached these people from the Near East, since the first domesticated crops were millets and sorghums whose origins are not African but west Asian. Once the idea of planting diffused, Africans began to develop their own crops, such as certain varieties of rice, and they demonstrated a continued receptiveness to new imports. The proposed areas of the domestication of Afri can crops lie in a band that extends from Ethiopia across southern Sudan to West Africa. Subsequently, other crops, such as bananas, were introduced from Southeast Asia.4. According to paragraph 2, camels were important because theyA. were the first domesticated animal to be introduced to AfricaB. allowed the people of the West African savannahs to carve out large empiresC. helped African peoples defend themselves against Egyptian invadersD. made it cheaper and easier to cross the Sahara5. According to paragraph 2, which of the following were subjects of rock paintings in the Sahara?A. Horses and chariotsB. Sheep and goatsC. Hyksos invaders from EgyptD. Camels and cattle6. What function does paragraph 3 serve in the organization of the passage as a whole?A. It contrasts the development of iron technology in West Asia and West Africa.B. It discusses a non-agricultural contribution to Africa from Asia.C. It introduces evidence that a knowledge of copper working reached Africa and Europe at the same time.D. It compares the rates at which iron technology developed in different parts of Africa7. The word “profound” in the passage is closest in meaning toA. fascinatingB. far-reachingC. necessaryD. temporaryLivestock also came from outside Africa. Cattle were introduced from Asia, as probably were domestic sheep and goats. Horses were apparently introduced by the Hyksos invaders of Egypt (1780-1560 B.C.) and then spread across the Sudan to West Africa. Rock paintings in the Sahara indicate that horses and chariots were used to traverse the desert and that by 300-200 B.C., there were trade routes across the Sahara. Horses were adopted by peoples of the West African savannah, and later their powerful cavalry forces allowed them to carve out large empires. Finally, the camel was introduced around the first century A.D. This was an important innovation, because the camel’ s abilities to thrive in harsh desert conditions and to carry large loads cheaply made it an effective and efficient means of transportation. The camel transformed the desert from a barrier into a still difficult, but more accessible, route of trade and communication.Iron came from West Asia, although its routes of diffusion were somewhat different than those of agriculture. Most of Africa presents a curious case in which societies moved directly from a technology of stone to iron without passing through the intermediate stage of copper or bronze metallurgy, although some early copper-working sites have been found in West Africa. Knowledge of iron making penetrated into the forest and savannahs of West Africa at roughly the same time that iron making was reaching Europe. Evidence of iron making has been found in Nigeria, Ghana, and Mali.This technological shift cause profound changes in the complexity of African societies. Iron represented power. In West Africa the blacksmith who made tools and weapons had an important place in society, often with special religious powers and functions. Iron hoes, which made the land more productive, and iron weapons, which made the warrior more powerful, had symbolic meaning in a number of West Africa societies. Those who knew the secrets of making iron gained ritual and sometimes political power.8. The word “ritual” in the passage is closest in meanin g toA. militaryB. physicalC. ceremonialD. permanent9. According to paragraph 4, all of the following were social effects of the new metal technology in Africa EXCEPT:A. Access to metal tools and weapons created greater social equality.B. Metal weapons increased the power of warriors.C. Iron tools helped increase the food supply.D. Technica丨 knowledge gave religious power to its holders.10. Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information.A. While American iron makers developed the latest furnaces, African iron makers continued using earlier techniques.B. Africans produced iron much earlier than Americans, inventing technologically sophisticated heating systems.C. Iron making developed earlier in Africa than in the Americas because of the ready availability of carbon and iron ore.D. Both Africa and the Americas developed the capacity for making iron early, but African metallurgy developed at a slower rate.Unlike in the Americas, where metallurgy was a very late and limited development, Africans had iron from a relatively early date, developing ingenious furnaces to produce the high heat needed for production and to control the amount of air that reached the carbon and iron ore necessary for making iron. Much of Africa moved right into the Iron Age, taking the basic technology and adapting it to local conditions and resources.11. The word “fleeing” in the passage is closest in meaning toA. afraid ofB. displaced byC. running away fromD. responding to12. Paragraph 6 mentions all of the following as possible causes of the “ Bantu explosion ” EXCEPTA. superior weaponsB. better hunting skillsC. peaceful migrationD. increased populationThe diffusion of agriculture and later of iron was accompanied by a great movement of people who may have carried these innovations. These people probably originated in eastern Nigeria. Their migration may have been set in motion by an increase in population caused by a movement of peoples fleeing the desiccation, or drying up, of the Sahara. They spoke a language,proto-Bantu (“Bantu” means “the people” ), wh ich is the parent tongue of a language of a large number of Bantu languages still spoken throughout sub-Sahara Africa. Why and how these people spread out into central and southern Africa remains a mystery, but archaeologists believe that their iron weapons allowed them to conquer their hunting-gathering opponents, who still used stone implements. Still, the process is uncertain, and peaceful migration — or simply rapid demographic growth—may have also caused the Bantu explosion.The diffusion of agriculture and later of iron was accompanied by a great movement of people who may havecarried these innovations. These people probably originated in eastern Nigeria. (Their migration may have beenset in motion by an increase in population caused by a movement of peoples fleeing the desiccation, or drying up,of the Sahara. (They spoke a language, proto-Bantu (“Bantu” means “the people，，)，which is the parent tongueof a language of a large number of Bantu languages still spoken throughout sub-Sahara Africa. Why and how these people spread out into central and southern Africa remains a mystery, but archaeologists believe that their ironweapons allowed them to conquer their hunting-gathering opponents, who still used stone implements. (Still,the process is uncertain, and peaceful migration—or simply rapid demographic growth—may have also causedthe Bantu explosion.(13. Look at the four squares [(] that indicate where the following sentence could be added to the passage. Where would the sentence best fit?These people had a significant linguistic impact on the continent as well.14. Direction: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points. Agriculture and iron working probably spread to Africa from neighboring regions.A. Once Africans developed their own crops, they no longer borrowed from other regions.B. The harshness of the African climate meant that agriculture could not develop until after the introduction of iron tools.C. The use of livestock improved transportation and trade and allowed for new forms of political control.D. As the Sahara expanded, the camel gained in importance, eventually coming to have religious significance.E. The spread of iron working had far-reaching effects on social, economic, and political organization in Africa.F. Today's Bantu-speaking peoples are descended from a technologically advanced people who spread throughout Africa.。

【威学教育王鑫整理出品】托福TPO7-1阅读文本

【王鑫托福阅读】托福TPO7-1阅读文本TPO7TPO7-1 The Geologic History of the MediterraneanAnother task for the Glomar Challenger's scientists was to try to determine the origin of the domelike masses buried deep beneath the Mediterranean seafloor. These structures had been detected years earlier by echo-sounding instruments, but they had never been penetrated in the course of drilling.Were they salt domes such as are common along the United States Gulf Coast, and if so, why should there have been so much solid crystalline salt beneath the floor of the Mediterranean?1. The word “objective” i n the passage is closest in meaning toA. achievementB. requirementC. purposeD. feature2. Which of the following is NOT mentioned in paragraph 1 as a change that occurred in the fauna of the Mediterranean?A. Most invertebrate species disappeared during a wave of extinctions.B. A few hardy species wiped out many of the Mediterranean’ s invertebrates.C. Some invertebrates migrated to Atlantic Ocean.D. New species of fauna populated the Mediterranean when the old migrants returned.In 1970 geologists Kenneth J. Hsu and William B.F. Ryan were collecting research data while aboard the oceanographic research vessel Glomar Challenger. An objective of this particular cruise was to investigate the floor of the Mediterranean and to resolve questions about its geologic history. One question was related to evidence that the invertebrate fauna (animals without spines) of the Mediterranean had changed abruptly about 6 million years ago. Most of the older organisms were nearly wiped out, although a few hardy species survived. A few managed to migrate into the Atlantic. Somewhat later, the migrants returned, bringing new species with them. Why did the near extinction and migrations occur?3. What does the author imply by saying “Not a single pebb le was found that might have indicated that the pebbles came from the nearby continent” ?A. The most obvious explanation for the origin of the pebbles was not supported by the evidence.B. The geologists did not find as many pebbles as they expected.C. The geologists were looking for a particular kind of pebble.D. The different pebbles could not have come from only one source.4. Which of the following can be inferred from paragraph 3 about the solid gypsum layer?A. It did not contain any marine fossil.B. It had formed in open-ocean conditions.C. It had once been soft, deep-sea mud.D. It contained sediment from nearby deserts.ve credit you5.Select the TWO answer choice from paragraph 3 that identify materials discovered in the deepest part of the Mediterranean basin. To receive credit must select TWO answers.A. Volcanic rock fragments.B. Thin silt layersC. Soft, deep-sea mudD. Crystalline saltWith question such as these clearly before them, the scientists aboard the Glomar Challenger processed to the Mediterranean to search for the answers. On August 23, 1970, they recovered a sample. The sample consisted of pebbles of hardened sediment that had once been soft, deep-sea mud, as well as granules of gypsum and fragments of volcanic rock. Not a single pebble was found that might have indicated that the pebbles came from the nearby continent. In the days following, samples of solid gypsum were repeatedly brought on deck as drilling operations penetrated the seafloor. Furthermore, the gypsum was found to possess peculiarities of composition and structure that suggested it had formed on desert flats. Sediment above and below the gypsum layer contained tiny marine fossils, indicating open-ocean conditions. As they drilled into the central and deepest part of the Mediterranean basin, the scientists took solid, shiny, crystalline salt from the core barrel. Interbedded with the salt were thin layers of what appeared to be windblown silt.1. What is the main purpose of paragraph 3?A. To describe the physical evidence collected by Hsu and RyanB. To explain why some of the questions posed earlier in the passage could not be answered by the findings of the Glomar ChallengerC. To evaluate techniques used by Hsu and Ryan to explore the sea floorD. To describe the most difficult problems faced by the Glomar Challenger expedition2. According to paragraph 4, which of the following was responsible for the evaporation of the Mediterranean ’ s waters?A. The movements of Earth’ s crustB. The accumulation of sediment layersC. Changes in the water level of the Atlantic OceanD. Changes in Earth’ s temperature3. The word “scores” in the passage is closest in meaning toA. membersB. large numbersC. populationsD. different types4. According to paragraph 4, what caused most invertebrate species in the Mediterranean to become extinct?A .The evaporation of chemicals necessary for their survivalA. Crustal movements that connected the Mediterranean to the saltier AtlanticB. The migration of new species through the narrow straitsC. Their inability to tolerate the increasing salt content of the MediterraneanThe time had come to formulate a hypothesis. The investigators theorized that about 20 million years ago, the Mediterranean was a broad seaway linked to the Atlantic by two narrow straits. Crustal movements closed the straits, and the landlocked Mediterranean began to evaporate. Increasing salinity caused by the evaporation resulted in the extermination of scores of invertebrate species. Only a few organisms especially tolerant of very salty conditions remained. As evaporation continued, the remaining brine (salt water) became so dense that the calcium sulfate of the hard layer was precipitated. In the central deeper part of the basin, the last of the brine evaporated to precipitate more soluble sodium chloride (salt). Later, under the weight of overlying sediments, this salt flowed plastically upward to form salt domes.Before this happened, however, the Mediterranean was a vast desert 3,000 meters deep. Then, about 5.5 million years ago came the deluge. As a result of crustal adjustments and faulting, the Strait of Gibraltar, where the Mediterranean now connects to the Atlantic, opened, and water cascaded spectacularly back into the Mediterranean. Turbulent waters tore into the hardened salt flats, broke them up, and ground them into the pebbles observed in the first sample taken by the Challenger. As the basin was refilled, normal marine organisms returned. Soon layer of oceanic ooze began to accumulate above the old hard layer.V5. Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information.A. The strait of Gibraltar reopened when the Mediterranean and the Atlantic became connected and the cascades of water from one sea to the other caused crustal adjustments and faulting.B. The Mediterranean was dramatically refilled by water from the Atlantic when crustal adjustments and faulting opened the Strait of Gibraltar, the place where the two seas are joined.C. The cascades of water from the Atlantic to the Mediterranean were not as spectacular as the crustal adjustments and faulting that occurred when the Strait of Gibraltar was connected to those seas.D. As a result of crustal adjustments and faulting and the creation of the Strait of Gibraltar, the Atlantic and Mediterranean were connected and became a single sea with spectacular cascades of water between them.6. The word “Turbulent” in the passage is closest in meaning toA. FreshB. DeepC. ViolentD. TemperateThe salt and gypsum, the fauna丨 changes, and the unusual gravel provided abundant evidence that the Mediterranean was once a desert.gypsum: a mineral made of calcium sulfate and water(Another task for the Glomar Challenger's scientists was to try to determine the origin of the domelike masses buried deep beneath the Mediterranean seafloor. (These structures had been detected years earlier byecho-sounding instruments, but they had never been penetrated such as are common along the United States Gulf Coast, and if crystalline salt beneath the floor of the Mediterranean? ( in the course of drilling.( Were they salt domes so, why should there have been so much solid7. Look at the four squares [■] that indicate where the followi ng sentence could be added to the passage. Where would the sentence best fit?Thus, scientists had information about the shape of the domes but not about their chemical composition and origin.8. Direction: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points. An expedition to the Mediterranean answered some long-standing questions about the ocean’ s history.A. The Glomar Challenger expedition investigated changes in invertebrate fauna and some unusual geologic features.B. Researchers collected fossils to determine which new species migrated from the Atlantic with older species.C. Scientists aboard the Glomar Challenger were the first to discover the existence of domelike masses underneath the seafloor.D. Samples recovered from the expedition revealed important differences in chemical composition and fossil distribution among the sediment layers.E. Evidence collected by the Glomar Challenger supports geologists' beliefs that the Mediterranean had evaporated and become a desert, before it refilled with water.F. Mediterranean salt domes formed after crustal movements opened the straits between the Mediterranean and the Atlantic, and the Mediterranean refilled with water.。

tpo52三篇托福阅读TOEFL原文译文题目答案译文背景知识

tpo52三篇托福阅读TOEFL原文译文题目答案译文背景知识阅读-1 (2)原文 (2)译文 (5)题目 (7)答案 (14)背景知识 (18)阅读-2 (23)原文 (23)译文 (26)题目 (28)答案 (37)背景知识 (40)阅读-3 (42)原文 (42)译文 (45)题目 (48)答案 (56)背景知识 (60)阅读-1原文Stream Deposit①A large,swift stream or river can carry all sizes of particles,from clay to boulders.When the current slows down,its competence(how much it can carry)decreases and the stream deposits the largest particles in the streambed.If current velocity continues to decrease-as a flood wanes,for example-finer particles settle out on top of the large ones. Thus,a stream sorts its sediment according to size.A waning flood might deposit a layer of gravel,overlain by sand and finally topped by silt and clay.Streams also sort sediment in the downstream direction. Many mountain streams are choked with boulders and cobbles,but far downstream,their deltas are composed mainly of fine silt and clay. This downstream sorting is curious because stream velocity generally increases in the downstream petence increases with velocity,so a river should be able to transport larger particles than its tributaries carry.One explanation for downstream sorting is that abrasion wears away the boulders and cobbles to sand and silt as the sediment moves downstream over the years.Thus,only the fine sediment reaches the lower parts of most rivers.②A stream deposits its sediment in three environments:Alluvial fans and deltas form where stream gradient(angle of incline)suddenly decreases as a stream enters a flat plain,a lake,or the sea;floodplain deposits accumulate on a floodplain adjacent to the stream channel; and channel deposits form in the stream channel itself.Bars,which are elongated mounds of sediment,are transient features that form in the stream channel and on the banks.They commonly form in one year and erode the next.Rivers used for commercial navigation must be recharged frequently because bars shift from year to year.Imagine a winding stream.The water on the outside of the curve moves faster than the water on the inside.The stream erodes its outside bank because the current's inertia drives it into the outside bank.At the same time,the slower water on the inside point of the bend deposits sediment,forming a point bar.A mid-channel bar is a sandy and gravelly deposit that forms in the middle of a stream channel.③Most streams flow in a single channel.In contrast,a braided stream flows in many shallow,interconnecting channels.A braided stream forms where more sediment is supplied to a stream than it can carry. The stream dumps the excess sediment,forming mid-channel bars.The bars gradually fill a channel,forcing the stream to overflow its banks and erode new channels.As a result,a braided stream flows simultaneously in several channels and shifts back and forth across itsfloodplain.Braided streams are common in both deserts and glacial environments because both produce abundant sediment.A desert yields large amounts of sediment because it has little or no vegetation to prevent erosion.Glaciers grind bedrock into fine sediment,which is carried by streams flowing from the melting ice.If a steep mountain stream flows onto a flat plain,its gradient and velocity decrease sharply.As a result,it deposits most of its sediment in a fan-shaped mound called an alluvial fan.Alluvial fans are common in many arid and semiarid mountainous regions.④A stream also slows abruptly where it enters the still water of a lake or ocean.The sediment settles out to form a nearly flat landform called a delta.Part of the delta lies above water level,and the remainder lies slightly below water level.Deltas are commonly fan-shaped, resembling the Greek letter"delta"(∆).Both deltas and alluvial fans change rapidly.Sediment fills channels(waterways),which are then abandoned while new channels develop as in a braided stream.As a result,a stream feeding a delta or fan splits into many channels called distributaries.A large delta may spread out in this manner until it covers thousands of square kilometers.Most fans,however,are much smaller,covering a fraction of a square kilometer to a few square kilometers.The Mississippi River has flowed through seven different delta channels during the past5,000to6,000years.But in recent years,engineers have built great systems of levees(retaining walls)in attempts to stabilize the channels.译文溪流沉积物①一条大而湍急的小溪或河流可以承载各种大小的颗粒，从微小的粘土到巨石。

托福TPO52综合写作阅读原文+听力原文+满分范文

¡¡¡¡ÎªÁË°ïÖú´ó¼Ò¸ßÐ§±¸¿¼ÍÐ¸££¬Îª´ó¼Ò´øÀ´ÍÐ¸£TPO52×ÛºÏÐ´×÷ÔÄ¶ÁÔ-ÎÄ+ÌýÁ¦Ô-ÎÄ+Âú·Ö·¶ÎÄ£¬Ï£Íû¶Ô´ó¼Ò±¸¿¼ÓÐËù°ïÖú¡£¡¡¡¡ÍÐ¸£TPO52×ÛºÏÐ´×÷ÔÄ¶ÁÔ-ÎÄÎÄ±¾£º¡¡¡¡Asteroids are large space objects made of rock and ice. There are hundreds of thousands of asteroids in our solar system. Though we often hear ideas about establishing colonies of humans to live and work on our Moon or our neighboring planet, Mars, some think that sending people to an asteroid would actually be the best colonization option for a number of reasons. Low Gravity To begin with, asteroids are often much smaller than planets, so they have lower gravity. When landing a spaceship, the craft would not be pulled as strongly or as forcefully toward the asteroid's surface, making the landing safer than landing on the Moon or Mars; it would also allow a spacecraft to carry much more equipment needed to set up the colony. It would also be easier for the spacecraft to take off again, so the spaceship would need to carry considerably less fuel for the trip back to Earth. Mining Valuable Metals Next some asteroids are rich in valuable elements and precious metals that are relatively rare on Earth, such as gold and platinum. An asteroid colony would be extremely profitable and a good source of these raw materials. The colonists or businesses sponsoring them could more than pay for the cost of their support by mining minerals and sending them back to Earth. Easy to Reach Finally, asteroids are a good option for colonization because some of them would be very easy to reach. There are a number of asteroids that periodically come within or near Earth's orbit Some of them actually get closer to Earth than our Moon. So these asteroids would be much easier and more affordable to get to and get back from than a planet like Mars, which would require a two-year trip in each direction.¡¡¡¡ÍÐ¸£TPO52×ÛºÏÐ´×÷ÌýÁ¦Ô-ÎÄÎÄ±¾£º¡¡¡¡Now listen to a part of a lecture on the topic you just read about.¡¡¡¡Asteroid colonization is not a very practical idea. Each of the points in the reading has a serious downside.¡¡¡¡First, while low gravity on an asteroid would make landing and taking off relatively easy, low-gravity environments also present certain risks. In a low-gravity environment, people start losing muscle mass and their bone density becomes lower. Even astronauts who spend just a few months in spaceships, which are low-gravity environments, suffer from health problems like muscle and bone density loss. Imagine the health problems that long-term colonists would experience on asteroids.¡¡¡¡Second, the availability of valuable metals might make an asteroid colony seem like a profitable idea but that¡¯s not the whole picture. You have to consider additional factors. One thing is the costs. The costs of supporting a colony and oftransporting the metals are likely to be high and will reduce the profits. And furthermore, there¡¯s no guarantee that the price for which you can sell the metals will remain the same. If precious metals are mined in large quantities, it would increase the supply of the metals, which could end up lower in the market price. So mining on asteroids may not be very profitable.¡¡¡¡Third, even if some asteroids are easy to reach, they may not be easy to return from. Asteroid orbits, the path on which asteroids travel through space, can be unusual. Some orbital paths come close to earth but then move away from earth, often a great distance away from earth. So even if an asteroid gets close to earth at one point, making it easy for colonists to get to the asteroid, it does not stay close to earth. It can actually travel much farther away from earth than a planet like Mars. Getting back from an asteroid that travels that far would be a challenge.¡¡¡¡ÍÐ¸£TPO52×ÛºÏÐ´×÷Âú·Ö·¶ÎÄ£º¡¡¡¡In the reading, the article comes up with an assumption that sending people to an asteroid would be the best colonization option and lists out three reasons to support this statement. However, in the listening, the professor questions the feasibility of this plan and offers his own perspective on the issue. First, the reading states that the low-gravity environment on asteroids makes it convenient for people to colonize there. However, in the listening, the professor presents certain risks of low-gravity environments and points out the problem is not that simple. People who live in a low-gravity environment would suffer from muscle loss and lower bone density. Even those astronauts who just spend a short period of time in spaceship would also have muscle and bone density loss, not to mention stay in a low-environment asteroid for longer periods. Second, the reading claims that the abundant resources on asteroids, such as gold and platinum, would make the prospect of the colonization very profitable and is worth colonizing. However, in the listening, the professor also points out one potential problem in it. The costs of mining and transporting these materials back to earth would be so high that the profit could be quite minimal. Also, if these raw materials are excavated in large quantities, the price of them is likely to be low in the market because there are too many of them. In this case, the whole business is not lucrative at all. Third, an easy reach to an asteroid is the third reason why it is worthy of colonization. In the listening, the professor points out one exception which will make the whole issue more complicated than it was expected. Asteroids are easy to reach but not that easy to return from. When an asteroid comes near to the Earth, it is indeed convenient to get onto it. But some orbital paths of asteroids are not predictable, they could get quite far away from the Earth. Under this circumstance, getting back from there would be a challenge, or even an illusion. Therefore, in the listening, the professor asserts that the asteroid colonization is not as simple as it was expected by pointing out three potential problems in the plan.。

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【王鑫托福阅读】托福TPO5-2阅读文本TPO5TPO5-2 The Origin of the Pacific Island People1. According to paragraph 1, all of the following are true statements about Melanesia, Micronesia, and Polynesia EXCEPT:A. Collectively, these regions are traditionally known as Oceania.B. These islands of Micronesia are small and spread out.C. Hawaii, Easter Island, and New Zealand mark the boundaries of Polynesia.D. Melanesia is situated to the north of Micronesia.The greater Pacific region, traditionally called Oceania, consists of three cultural areas: Melanesia, Micronesia, and Polynesia. Melanesia, in the southwest Pacific, contains the large islands of New Guinea, the Solomons, Vanuatu, and New Caledonia. Micronesia, the area north of Melanesia, consists primarily of small scattered islands. Polynesia is the central Pacific area in the great triangle defined by Hawaii, Easter Island, and New Zealand. Before the arrival of Europeans, the islands in the two largest cultural areas, Polynesia and Micronesia, together contained a population estimated at 700,000.2. By stating that the the ories are "mutually exclusive” the author means that A.if one of the theories is true, then all the others must be falseB. the differences between the theories are unimportantC. taken together, the theories cover all possibilitiesD. the theories support each other3. The word “overwhelming” in the passage is closest in meaning toA. powerfulB. favorableC. currentD. reasonable4. According to paragraph 2, which of the following led some early researchers to believe that the Pacific islanders originally came from Egypt? BA. Egyptians were known to have founded other great civilizations.B. Sailors from other parts of the world were believed to lack the skills needed to travel across the ocean.C. Linguistic, archaeological, and biological data connected the islands to Egypt.D. Egyptian accounts claimed responsibility for colonizing the Pacific as well as the Americas.5. Which of the following can be inferred from paragraph 2 about early theories of where the first inhabitants of the Pacific islands came from?A. They were generally based on solid evidence.B. They tried to account for the origin of the characteristic features of the languages spoken by Pacific islanders.C. They assumed that the peoples living in Southeast Asia did not have the skills needed to sail to the Pacific islands.D. They questioned the ideas of G. Elliot Smith and W. J. Perry.Speculation on the origin of these Pacific islanders began as soon as outsiders encountered them, in the absence of solid linguistic, archaeological, and biological data, many fanciful and mutually exclusive theories were devised. Pacific islanders are variously thought to have come from North America, South America, Egypt, Israel, and India, as well as Southeast Asia. Many older theories implicitly deprecated the navigational abilities and overall cultural creativity of the Pacific islanders. For example, British anthropologists G. Elliot Smith and W. J. Perry assumed that only Egyptians would have been skilled enough to navigate and colonize the Pacific.They inferred that the Egyptians even crossed the Pacific to found the great civilizations of the New World (North and South America). In 1947 Norwegian adventurer Thor Heyerdahl drifted on a balsa-log raft westward with the winds and currents across the Pacific from South America to prove his theory that Pacific islanders were Native Americans (also called American Indians). Later Heyerdahl suggested that the Pacific was peopled by three migrations: by Native Americans from the Pacific Northwest of North America drifting to Hawaii, by Peruvians drifting to Easter Island, and by Melanesians. In 1969 he crossed the Atlantic in an Egyptian-style reed boat to prove Egyptian influences in the Americas. Contrary to these theorists, the overwhelming evidence of physical anthropology, linguistics, and archaeology shows that the Pacific islanders came from Southeast Asia and were skilled enough as navigators to sail against the prevailing winds and currents.6. The word “implements” in the passage is closest in meaning toA. skillsB. toolsC. opportunitiesD. practices7. All of the following are mentioned in paragraph 3 as required for successful colonization of the Pacific islands EXCEPTA. knowledge of various Austronesian languagesB. a variety of fishing techniquesC. navigational skillsD. knowledge of plant cultivation8.In paragraph 3, why does the author provide information about the types of crops grown and boats used in Southeast Asia during the period around 5000B. C. E.?A. To evaluate the relative importance of agriculture and fishing to early Austronesian peoplesB. To illustrate the effectiveness of archaeological and linguistic methods in discovering details about life in ancient timesC. To contrast living conditions on the continent of Asia with living conditions on the Pacific islandsD. To demonstrate that people from this region had the skills and resources necessary to travel to and survive on the Pacific islandsThe basic cultural requirements for the successful colonization of the Pacific islands include the appropriate boat-building, sailing, and navigation skills to get to the islands in the first place, domesticated plants and gardening skills suited to often marginal conditions, and a varied inventory of fishing implements and techniques. It is now generally believed that these prerequisites originated with peoples speaking Austronesian languages (a group of several hundred related languages) and began to emerge in Southeast Asia by about 5000 B.C.E. The culture of that time, based on archaeology and linguistic reconstruction, is assumed to have had a broad inventory of cultivated plants including taro, yarns, banana, sugarcane, breadfruit, coconut, sago, and rice. Just as important, the culture also possessed the basic foundation for an effective maritime adaptation, including outrigger canoes and a variety of fishing techniques that could be effective for overseasvoyaging.9. Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information.A. Some people have argued that the Pacific was settled by traders who became lost while transporting domesticated plants and animals.B. The original Polynesian settlers were probably marooned on the islands, but they may have been joined later by carefully prepared colonization expeditions.C. Although it seems reasonable to believe that colonization expeditions would set out fully stocked, this is contradicted by much of the evidence.D. The settlement of the Pacific islands was probably intentional and well planned rather than accidental as some people have proposed.10. The word “undisputed” in the passage is closest in meaning toA. mysteriousB. unexpectedC. acknowledgedD. significant11. According to paragraph 4, which of the following is NOT an explanation for why a group of people might have wanted to colonize the Pacific islands?A. As their numbers increased, they needed additional territory.B. The winds and currents made the islands easy to reach.C. The political situation at home made emigration desirable.D. They found exploration challenging and exciting.Contrary to the arguments of some that much of the pacific was settled by Polynesians accidentally marooned after being lost and adrift, it seems reasonable that this feat was accomplished by deliberate colonization expeditions that set out fully stocked with food and domesticated plants and animals. Detailed studies of the winds and currents using computer simulations suggest that drifting canoes would have been a most unlikely means of colonizing the Pacific. These expeditions were likely driven by population growth and political dynamics on the home islands, as well as the challenge and excitement of exploring unknown waters.Because all Polynesians, Micronesians, and many Melanesians speak Austronesian languages and grow crops derived from Southeast Asia, all these peoples most certainly derived from that region and not the New World or elsewhere. The undisputed pre-Columbian presence in Oceania of the sweet potato, which is a New World domesticate, has sometimes been used to support Heyerdahl's “American Indians in the Pacific” theories. However, this is one plant out of a long list of Southeast Asian domesticates. As Patrick Kirch, an American anthropologist, points out, rather than being brought by rafting South Americans, sweet potatoes might just have easily been brought back by returning Polynesian navigators who could have reached the west coast of South America.12. Why does the author mention the views of “Patrick Kirch” ?A. To present evidence in favor of Heyerdahl’ s idea about American Indians reaching OceaniaB. To emphasize the familiarity of Pacific islanders with crops from many different regions of the worldC. To indicate that supposed proof for Heyerdahl’ s theory has an al ternative explanationD. To demonstrate that some of the same crops were cultivated in both South America and OceaniaSpeculation on the origin of these Pacific islanders began as soon as outsiders encountered them, in the absence of solid linguistic, archaeological, and biological data, many fanciful and mutually exclusive theories weredevised. Pacific islanders are variously thought to have come from North America, South America, Egypt, Israel, and India,as well as Southeast Asia.— Many older theories implicitly deprecated the navigational abilities and overall cultural creativity of the Pacific islanders. For example, British anthropologists G. Elliot Smith and W. J. Perryassumed that only Egyptians would have been skilled enough to navigate an d colonize the Pacific.■ They inferredthat the Egyptians even crossed the Pacific to found the great civilizations of the New World (North and South America). | In 1947 Norwegian adventurer Thor Heyerdahl drifted on a balsa-log raft westward with the winds and currents across the Pacific from South America to prove his theory that Pacific islanders were Native Americans (also called American Indians). Later Heyerdahl suggested that the Pacific was peopled by three migrations: by Native Americans from the Pacific Northwest of North America drifting to Hawaii, by Peruvians drifting to Easter Island, and by Melanesians. In 1969 he crossed the Atlantic in an Egyptian-style reed boat to prove Egyptian influences in the Americas. Contrary to these theorists, the overwhelming evidence of physical anthropology, linguistics, and archaeology shows that the Pacific islanders came from Southeast Asia and were skilled enough as navigators to sail against the prevailing winds and currents.13. Look at the four squares [■] that indicate where the following sentence could be added to the passage. Where could the sentence best fit?Later theories concentrate on journeys in the other direction.14. Choices do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points. Together, Melanesia, Micronesia, and Polynesia make up the region described as the Pacific islands, or Oceania.A. The first Europeans to reach the area as sumed that the islands’ original inhabitants must have drifted to Oceania, perhaps from Egypt or the Americas.B. It is now believed that the process of colonization required a great deal of skill, determination, and planning and could not have happened by chance.C. Using linguistic and archaeological evidence, anthropologists have determined that the first Pacific islanders were Austronesian people from Southeast Asia.D. New evidence suggests that, rather than being isolated, Pacific islanders engaged in trade and social interaction with peoples living in Southeast Asia.E. Computer simulations of the winds and currents in the Pacific have shown that reaching the Pacific islands was probably much easier than previously thought.F. Although early colonizers of the islands probably came from agriculture-based societies, they were obliged to adopt an economy based on fishing.。