托福阅读TPO27句子简化题分析——题2
老托福阅读试题及答案：PASSAGE27
老托福阅读试题及答案：PASSAGE27推荐文章老托福阅读真题及答案：PASSAGE30 热度：老托福阅读100篇passage33试题及答案热度：老托福阅读真题及答案：PASSAGE2 热度：托福阅读TPO14(试题+答案+译文)第1篇:儿童与广告热度：老托福阅读试题及答案：PASSAGE30 热度：为了帮助大家备考托福阅读，提高成绩，下面小编给大家带来老托福阅读真题及答案:passage 27，希望大家喜欢！老托福阅读试题及答案：PASSAGE 27The mineral particles found in soil range in size from microscopic clay particles to large boulders. The most abundant particles — sand, silt, and clay — are the focus of examination in studies of soil texture. Texture is the term used to describe the composite sizes of particles in a soil sample, typically several representative handfuls.To measure soil texture, the sand, silt, and clay particles are sorted out by size and weight. The weights of each size are then expressed as a percentage of the sample weight. In the field, soil texture can be estimated by extracting a handful of soil and squeezing the damp soil into three basic shapes; (1) cast, a lump formed by squeezing a sample in a clenched fist; (2) thread, a pencil shape formed by rolling soil between the palms; and (3) ribbon, a flatfish shape formed by squeezing a small sample between the thumb and index finger. The behavioral characteristics of the soil when molded into each of these shapes, if they can be formed at all, provide the basis for a general textural classification. The behavior of the soil in the hand test is determined by the amount of clay in the sample. Clay particles are highly cohesive, and when dampened, behave as a plastic.Therefore the higher the clay content in a sample, the more refined and durable the shapes into which it can be molded.Another method of determining soil texture involves the use of devices called sediment sieves, screens built with a specified mesh size. When the soil is filtered through a group of sieves, each with a different mesh size, the particles become grouped in corresponding size categories. Each category can be weighed to make a textural determination. Although sieves work well for silt, sand, and larger particles, they are not appropriate for clay particles. Clay is far too small to sieve accurately; therefore, in soils with a high proportion of clay, the fine particles are measured on the basis of their settling velocity when suspended in water. Since clays settle so slowly, they are easily segregated from sand and silt. The water can be drawn off and evaporated, leaving a residue of clay, which can be weighed.1. What does the passage mainly discuss?(A) Characteristics of high quality soil(B) Particles typically found in most soils(C) How a high clay content affects the texture of soil(D) Ways to determine the texture of soil2. The author mentions "several representative handfuls" in line 4 in order to show(A) the range of soil samples(B) the process by which soil is weighed(C) the requirements for an adequate soil sample(D) how small soil particles are weighted3. The phrase "sorted out" in line 5 is closest in meaning to(A) mixed(B) replaced(C) carried(D) separated4. It can be inferred that the names of the three basic shapes mentioned in paragraph 2 reflect(A) the way the soil is extracted(B) the results of squeezing the soil(C) the need to check more than one handful(D) the difficulty of forming different shapes5. The word "dampened" in line 14 is closest in meaning to(A) damaged(B) stretched(C) moistened(D) examined6. Which of the following can be inferred from the passage about a soil sample with little or no clay in it?(A) It is not very heavy.(B) It may not hold its shape when molded.(C) Its shape is durable(D) Its texture cannot be classified7. The word "they" in line 21 refers to(A) categories(B) sieves(C) larger particles(D) clay particles8. It can be inferred from the passage that the sediment sieve has an advantage over the hand test in determining soil texture because(A) using the sieve takes less time(B) the sieve can measure clay(C) less training is required to use the sieve(D) the sieve allows for a more exact measure9. During the procedure described in paragraph 3, when clay particles are placed into water they(A) stick to the sides of the water container(B) take some time to sink to the bottom(C) separate into different sizes(D) dissolve quickly10. The word "fine" in line 24 is closest in meaning to(A) tiny(B) many(C) excellent(D) various11. All of the following words are defined in the passage EXCEPT(A) texture (line 3)(B) ribbon (line 10)(C) sediment sieves (line 18)(D) evaporated (line 25)正确答案：DADBC BBDBA D托福阅读怎么练?有些考生则喜欢把文章一字不漏地细读之后再做题。
tpo27托福范文
托福TPO27指的是什么呢？1。
原句讲了两个重点，一是人口估计不准，二是U这个地方的居民能自给自足。
A选项的前半正确，但后半句说不依靠农业明显是错的，不选；B说不确定是否能feed，跟原文相反，不选；C选项不但因果关系有问题，而且原因说不能feed他们自己，也与原文相反，不选；正确答案D，重点说的是能support他们自己，尽管没有说人口估计不准，但原文的转折重点体现在后半句，所以正确答案是D 2。
surpass超过，不懂的可以拆分，至少有pass，应该与超过有关，而选项中与超过有关的只有B，就算不认识也可以通过前缀ex-表明XX之外，说明与“过”有关。
A在XXX之前，C挑战D比XX持久都不沾边儿 3。
EXCEPT题，排除法。
A的permanent settlement做关键词定位至第二句，A正确，不选；B的self-sufficient自给自足作为形容词很难在原文中找到，但第一题简化句子题的那个句子中有这个信息，所以这个选项正确，不选；C的other larger settlement没讲，错，选；D选项同样出现在句子简化题的句子当中，正确，不选4。
intact未受破坏的，完整的，所以正确答案是C的undamaged。
原词in前缀表示否定，tact表示接触，碰。
代入原文，原文讲由于一些不明的原因，很多bowl被抛弃了，仍然是XXX状态，在整个近东地区发现了若干只，A没卖出去D没画上都不沾边，B没使用代入是说得通的，但原词没有unused的意思，不能选 5。
以beveled-rim bowls和专有名词做关键词定位至第五句，原句讲早期的一个考古学遗址上发现了这个style，特别具有这一过程的特点，被称为beveled-rim bowl，但仅凭此句无法选出答案，于是向下，下一句说由于是用mold做的，因此只有数目不多的standard size，所以正确答案是D。
B说形状和装饰变化很大，C说各具特色，这都不是mold能够完成的，因此与D相反，都错；A的discard原文有讲到，但原文也明确说不知道什么原因，所以unpopular错 6。
托福阅读TPO27-2 The Formation of Volcanic Islands
The Formation of Volcanic IslandsEarth’s surface is not made up of a single sheet of rock that forms a crust but rather a number of “tectonic plates” that fit closely, like the pieces of a giant jigsaw puzzle. Some plates carry islands or continents others form the seafloor. All are slowly moving because the plates float on a denser semi-liquid mantle, the layer between the crust and Earth’s core. The plates have edges that are spreading ri dges (where two plates are moving apart and new seafloor is being created), subduction zones (where two plates collide and one plunges beneath the other), or transform faults (where two plates neither converge nor diverge but merely move past one another). It is at the boundaries between plates that most of Earth’s volcanism and earthquake activity occur.Generally speaking, the interiors of plates are geologically uneventful. However, there are exceptions. A glance at a map of the Pacific Ocean reveals that there are many islands far out at sea that are actually volcanoes----many no longer active, some overgrown with coral----that originated from activity at points in the interior of the Pacific Plate that forms the Pacific seafloor.How can volcanic activity occur so far from a plate boundary? The Hawaiian Islands provide a very instructive answer. Like many other island groups, they form a chain. The Hawaiian Islands Chain extends northwest from the island of Hawaii. In the 1840s American geologist James Daly observed that the different Hawaii islands seem to share a similar geologic evolution but are progressively more eroded, and therefore probable older, toward the northwest. Then in 1963, in the early days of the development of the theory of plate tectonics. Canadian geophysicist Tuzo Wilson realized that this age progression could result if the islands were formed on a surface plate moving over a fixed volcanic source in the interior. Wilson suggested that the long chain of volcanoes stretching northwest from Hawaii is simply the surface expression of a long-lived volcanic source located beneath the tectonic plate in the mantle. Today’s most northwest island would have been the first to form. They as the plate moved slowly northwest, new volcanic islands would have forms as the plate moved over the volcanic source. The most recent island, Hawaii, would be at the end of the chain and is now over the volcanic source.Although this idea was not immediately accepted, the dating of lavas in the Hawaii (and other) chains showed that their ages increase away from the presently active volcano, just as Daly had suggested. Wilson’s analysis of these data is now a central part of plate tectonics. Most volcanoes that occur in the interiors of plates are believed to be produced by mantle plumes, columns of molten rock that rise from deep within the mantle. A volcano remains an active “hot spot” as long as it is over the plume. The plumes apparently originate at great depths, perhaps as deep as the boundary between the core and the mantle, and many have been active for a very long time. The oldest volcanoes in the Hawaii hot-spot trail have ages close to 80 million years. Other islands, including Tahiti and Easter Islands in the pacific, Reunion and Mauritius in the In dia Ocean, and indeed most of the large islands in the world’s oceans, owe their existence to mantle plumes.The oceanic volcanic islands and their hot-spot trails are thus especially useful for geologist because they record the past locations of the plate over a fixed source. They therefore permit the reconstruction of the process of seafloor spreading, and consequently of the geography of continents and of ocean basins in the past. For example, given the current position of the Pacific Plate, Hawaii is above the Pacific Ocean hot spot. So the position of The Pacific Plate 50 million years ago can be determined by moving it such that a 50-million-year-oil volcano in the hot-spot trail sits at the location of Hawaii today. However because the ocean basins really are short-lived features on geologic times scale, reconstruction the world’s geography by backtracking along the hot-spot trail works only for the last 5 percent or so of geologic time.Paragraph 1: Earth’s surface is not made up of a single shee t of rock that forms a crust but rather a number of “tectonic plates” that fit closely, like the pieces of a gain jigsaw puzzle. Some plates carry islands or continents, others form the seafloor. All are slowly moving because the plates float on a denser sem-iliquid mantle, the layer between the crust and Earth’s core. The plates have edges that are spreading ridgescollide and one plunges beneath the other), or transform faults (where two plates nor diverge but merely move past one another). It is at the boundaries between plates that most of Earth’s volcanism and earthquake activity occur.1.The author mentions “spreading ridges”, “subduction zones”, and “transform faults” in order toO illustrate that the boundaries of tectonic plates are neat, thin linesO explain why some tectonic plates carry islands or continents while others form the seafloorO explain the complex nature of the edges of tectonic platesO provide examples of areas of tectonic plates where little geologic action occursO expandO formO riseO move closer3.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 O Volcanic activity is responsible for the formation of the Pacific seafloor in the interior of the Pacific Plate.O Many volcanoes in the Pacific Ocean are no longer active and have become islands that supportcoral.O There are many islands in the Pacific Ocean that originated as volcanoes in the interior of the Pacific Plate.O The map of the Pacific Ocean reveals fewer volcanic islands than there truly are because many are no longer active and some are completely overgrown with coral.volcanic activity occur so far from a plate boundary? The Hawaiian islandsChain extends northwest from the island of Hawaii. In the 1840s American geologist James Daly observed that the different Hawaii islands seem to share a similar geologic evolution but are progressively moreand therefore probable older, toward the northwest. Then in 1963, in the early days of the development of the theory of plate tectonics. Canadian geophysicist Tuzo Wilson realized that this age progression could result if the islands were formed on a surface plate moving over a fixed volcanic source in the interior. Wilson suggested that the long chain of volcanoes stretching northwest from Hawaii is simply the surface expression of a long-lived volcanic source located beneath the tectonic plate in the mantle. Today’s most northwest island would have been the first to form. They as the plate moved slowly northwest, new volcanic islands would have forms as the plate moved over the volcanic source. The most recent island, Hawaii, would be at the end of the chain and is now over the volcanic source.O clearO detailedO informativeO familiarO worm downO scatteredO developedO deserted6.In paragraph 3, what is the relationship between the scientific contribution of James Daly and Tuzo Wilson?O Wilson provided an explanation for the observations made by Daly.O Wilson challenged the theory proposed by Daly.O Wilson found numerous examples of island chains that supported Daly’s theory.O Wilson popularized the explanation of volcanic island formation formulated by Daly.Paragraph 4: Although this idea was not immediately accepted, the dating of lavas in the Hawaii (and other) chains showed that their ages increase away from the presently active volcano, just as Daly had suggested. Wilson’s analysis of these data is now a central part of plate tectonics. Most volcanoes thatoccur in the interiors of plates are believed to be produced by mantle plumes, columns of molten rock that rise from deep within the mantle. A volcano remains an active “hot spot” as long as it is over t he plume. The plumes apparently originate at great depths, perhaps as deep as the boundary between the core and the mantle, and many have been active for a very long time. The oldest volcanoes in the Hawaii hot-spot trail have ages close to 80 million years. Other islands, including Tahiti and Easter Islands in the pacific, Reunion and Mauritius in the India Ocean, and indeed most of the large islands in the world’s oceans, owe their existence to mantle plumes.7.Why does the author provide the informatio n that “the dating of lavas in the Hawaii (and other) chains showed that their ages increase away from the presently active volcano”?O To point out differences between the Hawaii island chain and other volcanic island chainsO To question the idea that all the islands in an island chain have been formed by volcanic activity O To explain why Wilson hypothesis was initially difficult to acceptO To provide evidence in support of Daly’s and Wilson’s ideas about how the Hawaii islands were formed8.According to paragraph 4, which of the following is true of mantle plumesO They exist close to the surface of tectonic plates.O They cause most of the volcanic activity that occurs in the interiors of plates.O They are rarely active for long period of time.O They get increasingly older away from the present hot spots.Paragraph 5: The oceanic volcanic islands and their hot-spot trails are thus especially useful for geologist because they record the past locations of the plate over a fixed source. They therefore permit thePacific Ocean hot spot. So the position of The Pacific Plate 50 million years ago can be determined by moving it such that a 50-million-year-oil volcano in the hot-spot trail sits at the location of Hawaii today. However because the ocean basins really are short-lived features on geologic times scale, reconstruction the world’s geography by backtracking along the hot-spot trail works only for the last 5 percent or so of geologic time.9.According to paragraph 5, volcanic islands help geologists toO reconstruct past geographyO detect changes in mantle plumesO measure the rigidity of tectonic platesO explain why the seafloor spreads10.What can be inferred about the Pacific Plate from paragraph 5?O The hot spots on the Pacific Plate are much older than the ones located on the other tectonic plates.O Most of the volcanic sources beneath the Pacific Plate have become extinct.O The Pacific Plate has moved a distance equal to the length of the Hawaiian Island chain in the past 80 million years.O The Pacific Plate is located above fewer mantle plumes than other plates are.O originalO idealO relativeO present12.According to paragraph 5, why are geologists unable to trace back the entire geologic of continents from hot-spot trails?O Hot spots have existed for only about 5 percent of geologic time.O Hawaii did not exist 50 millions years ago.O Oceanic basins that contained old hot-spot trails disappeared a long time ago.O Hot-spot trails can be reconstructed only for island chains.Paragraph 3: How can volcanic activity occur so far from a plate boundary? The Hawaiian islands provide a very instructive answer. ■Like many other island groups, they form a chain. ■The Hawaiian Islands Chain extends northwest from the island of Hawaii. ■In the 1840s American geologist James Daly observed that the different Hawaii islands seem to share a similar geologic evolution but are progressively more eroded, and therefore probable older, toward the northwest. ■Then in 1963, in the early days of the development of the theory of plate tectonics. Canadian geophysicist Tuzo Wilson realized that this age progression could result if the islands were formed on a surface plate moving over a fixed volcanic source in the interior. Wilson suggested that the long chain of volcanoes stretching northwest from Hawaii is simply the surface expression of a long-lived volcanic source located beneath the tectonic plate in the mantle. Today’s most northwest island would have been the first to form. They as the plate moved slowly northwest, new volcanic islands would have forms as the plate moved over the volcanic source. The most recent island, Hawaii, would be at the end of the chain and is now over the volcanic source.13.Look at the four squares [■] that indicate where the following sentence could be added to the passage.This pattern remained unexplained for a long time.Where would the sentence best fit?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.Although volcanic activity is concentrated on the edge of tectonic plates, such activity can occur in the interiors of plates as well.Answer Choices●●●O Our understanding of islands comes from Daly’s and Wilson’s observations of the Hawaiian Islands, which was later confirmed by plate-tectonic theory.O The hot-spot trails formed by volcanic island chains indicate the positions of tectonic plates as for back as the present ocean basins have existed.O Whereas volcanic islands formed by mantle plumes are typically small, most of the world’s largest islands are formed at the edges of tectonic plates.O It has only recently been discovered that tectonic plates are closely fitting rather than loosely constructed, as geologist previously believed.O Volcanic island chains such as the Hawaiian Islands form in the interior of a tectonic plate as the plate moves over a fixed volcanic source in the mantle.O The Pacific Plate has existed for as long as the Hawaiian Islands have existed, namely for more than 80 million years.参考答案1.○32.○43.○34.○35.○16.○17.○48.○29.○110.○311.○412.○313.○414. Our understanding of islands comes…Whereas volcanic islands…It has only recently been…。
tpo27独立写作
TPO27: Do you agree or disagree with the following statement?If people have the opportunity to get secure job, they should take it right away rather than wait for a job that would be more satisfying.Whether to accept a secure job or wait for a more satisfying job is a dilemma that many people have encountered, especially for the fresh college graduates. People's opinion to this problem may vary from person to person. As far as I am concerned, for the majority of people, it is better to get a secure job when the work opportunity is offered than wait for a more satisfying job opportunity.First of all, a more satisfying job all too often requires the job candidates with a professional training and relative work experience. For example, lawyer can be considered as a desirable job because of a highly paid salary and flexible working hours. However, in order to become a lawyer, people first need to study in law school for years and research countless cases, and they are supposed to work for years before they are acquainted with general law services. Many fresh law graduates wish to work as a chef lawyer merely relying on the law training they have received from school. However, this is quite unrealistic. Instead of applying for申请the chief lawyer position, I think to be a lawyer assistant should be more suitable for the newly graduated lawyers. Chance only favors the prepared mind. Therefore, I think people should accept a secure job to earn some practical working experience before they are ready for a more satisfying position.In addition, a seemingly plain job may turn out to be more satisfying as time goes on. The truth is the longer we work in a particular position, the more skillful we will become. Many newly graduates are reluctant to work as a salesperson for the simple reason that a salesman is lowly paid in most cases, yet with additional working hours. My neighbor Mike is a salesman in a woman shoe section in a big shopping mall. This job would be treated as secure but not satisfying by most people. However, Mike gradually acquired an increasing passion for this job. He found it fun to recommend shoes to women according to their age and taste. Mike signed up for an etiquette class in a night school which he acquired the appropriate talking and behaving strategies. At work, he treats each consumer with equal respect and patience. As a result, he has kept the highest sale for years. At present, Milk is still a salesperson and he is proud to be a salesperson, for he is expert in selling women shoes, at the same time, he is well paid due to his good sales.Also, the seemingly satisfactory jobs probably turn out to be less satisfying. People usually envy those in charge of a department, a department manager as we may call. They are well paid and have the power supervising the inferiors. On the contrary, a department manager have to shoulder more responsibilities and needs to travel in business trips to other cities that they will have limited time to be with their family. Every coin has two sides. If we take a close look at any seemingly pleasing job, wewill discover the downside. Therefore, the key to success in a job should be placed on a right attitude and above all, we need to keep learning.To sum up, take all the aspects I mentioned above into account, I firmly believe we should take the secure job and make it become more satisfying as we are getting more skillful.文案编辑词条B 添加义项?文案，原指放书的桌子，后来指在桌子上写字的人。
托福阅读真题第27套
第27套BirdsongParagraph1Birdsong is the classic example of how genes(hereditary information)and environment both have a crucial role to play in the behavioral development of animals. Since the pioneering work of W.H.Thorpe on chaffinches(a common European bird), many species have been studied,and it has become clear both that learning plays an important role for all species and also that there are constraints on what they are able to learn.1.The word“pioneering”in the passage is closet in meaning torecentfamousoriginalcontroversialParagraph2Thorpe was able to show that learning from others was involved in chaffinch birds through a series of experiments on hand-reared chicks(young birds).As in most other species,only the males sing.Thorpe found that,if he raised young males in total isolation from all others,the song they produced was quite different from that of a normal adult.It was about the right length and in the correct frequency range.It was also split up into a series of notes as it should be.But these notes lacked the detailed structure found in wild birds,nor was the song split up into distinct phrases as it usually is.This suggested that song development requires some social ter experiments in which researchers played recordings of songs to young birds showed just how precise this influence was:many of them would learn the exact pattern of the recording they had heard.A remarkable feature here was that birds were able to copy precisely songs that they only heard in the first few weeks of life,yet they did not sing themselves until about eight months old.They are thus able to store a memory of the sound within their brain and then match their own output to their recollection of it when they mature.2.The word“distinct”in the passage is closet in meaning toshortsimpleseparatesimilar3.According to paragraph2,all of the following are characteristics of the songs ofthe young chaffinches in Thorpe’s experiment EXCEPT:They were not identical to the songs of normal adult chaffinches.They lacked the complex form of the songs of wild chaffinches.They were as long as the songs of normal adult chaffinches.They were clearly different from each other.4.According to paragraph2,researchers discovered which of the following byplaying recordings of songs to chaffinches?Chaffinches could no longer be taught to reproduce sounds after the first few weeks of life.Chaffinches could not reproduce songs with exactly the same patterns of recorded songs.Chaffinches at the age of eight months could recall and reproduce a song that they heard in the first few weeks of life.Chaffinches that learned a song from recordings in the first few weeks of life were later unable to copy the sounds of mature chaffinches.5.All of the following are mentioned in paragraph2as characteristics of wildchaffinches EXCEPT:They are able to copy songs very precisely.Their song development requires interaction with other chaffinches.Their songs are not as well-structured as the songs of other birds.It is the males of the species that do the singing.Paragraph3Young chaffinches normally learn only chaffinch song,though Thorpe found they could be trained to sing the song of a tree pipit(another type of bird),which is very similar to that of their own species.In general,however,the constraints on learning which birds have ensure that they only learn songs appropriate to the species to which they themselves belong.These constraints may be in their brain’s circuitry,the young bird hatching with a rough idea of the sounds that it should copy.The crude song of a bird reared in isolation gives some clues as to what this rough idea may be:the length, the frequency range and the breaking up into notes are all aspects of chaffinch song shared between normal birds and those reared in isolation.In other cases the constraints are more social,young birds only being prepared to learn from individuals with whom they have social interactions.Thus,in a number of species,it has been found that they will not copy from recordings,but will do so from a live tutor.In some cases this may occur when they are young birds,but in others the main learning period is when they set up their territories and interact with neighbors for the first time,enabling them to match their neighbor’s songs and so countering with them. Whatever the nature of the learning rules in a particular species,there is no doubt that they are effective;it is very unusual to hear a wild bird singing a song which is not typical of its own species despite the many different songs which often occur in a small patch of woodland.6.The word“enabling”in the passage is closet in meaning toallowingchallengingforcingpreparing7.It can be inferred from paragraph3that one of the functions of songs in birds is to bring together birds living in groups with birds living in isolationhelp young birds distinguish other young birds from adultsmake possible interactions between birds of different specieshelp birds to establish territories8.Which of the sentences below best expresses the essential information in thehighlighted sentence in the passage?Incorrect choices change the meaning in important ways or leave out essential information.Songs produced by chaffinches reared in isolation are cruder than the songs of wild birds.The song of a bird reared in isolation suggests which aspects of chaffinch song may be inborn.Comparing the crude songs of chaffinches reared in isolation to the songs of wild chaffinches suggests differences as well as similarities.Studying the song aspects of chaffinches reared in isolation,researchers have gained a better understanding of the songs produced by wild birds.9.According to paragraph3,in some species,young birds do not copy songs fromrecordings becausethey learn to sing only by live interactions with other birdstheir ability to learn from recordings occurs later in lifethey can only learn the songs of the birds living in their area of woodlandthey can only learn songs from other birds of their own species10.Why does the author mention that it is very unusual to hear a wild bird singing asong which is not typical of its own species?To explain why a variety of different bird songs are often heard in a relatively small areaTo argue that social constraints have a greater impact upon learning than do genetic constraintsTo provide an example of how the process of learning rules varies from one species to anotherTo illustrate how effective the different constraints upon learning are in young birdsParagraph4However,not all birds show the same learning pattern as do chaffinches.There are some species which produce normal sounds even if deaf,so that they cannot hear their own efforts,much less copy those of others.The cooing of doves and the crowing ofcocks are examples here.In other cases,such as parrots and hill mynahs,birds can be trained to copy a huge variety of sounds,though those they learn in the wild are usually more restricted.The amazing capability of mynahs has apparently arisen simply because birds in an area learn a small number of their calls from each other, males from males and females from females,and these calls are highly varied in structure.The ability to master them has led the birds,incidentally,to be capable of saying“hello”and mimicking a wide variety of other sounds.11.The word“restricted”in the passage is closet in meaning toimportantpopularlimitedaccurate12.According to paragraph4,why are mynahs able to learn to make a wide variety ofsounds?They have the ability to imitate any sound that they are exposed to.The frequency with which mynahs travel from one small area to another exposes them to a wide variety of sounds.They are exposed in the wild to calls that are very different from each other.An acute sense of hearing allows them to listen to and copy many different sounds.13.Look at the four squares[■]that indicate where the following sentence can beadded to the passage.Are these constraints genetic,environmental,or both?Where would the sentence best fit?Click on a square[■]to add the sentence to the passage.Paragraph3Young chaffinches normally learn only chaffinch song,though Thorpe found they could be trained to sing the song of a tree pipit(another type of bird),which is very similar to that of their own species.■In general,however,the constraints on learning which birds have ensure that they only learn songs appropriate to the species to which they themselves belong.■These constraints may be in their brain’s circuitry,the young bird hatching with a rough idea of the sounds that it should copy.■The crude song of a bird reared in isolation gives some clues as to what this rough idea may be: the length,the frequency range and the breaking up into notes are all aspects of chaffinch song shared between normal birds and those reared in isolation.■In other cases the constraints are more social,young birds only being prepared to learn from individuals with whom they have social interactions.Thus,in a number of species,it has been found that they will not copy from recordings,but will do so from a livetutor.In some cases this may occur when they are young birds,but in others the main learning period is when they set up their territories and interact with neighbors for the first time,enabling them to match their neighbor’s songs and so countersing with them.Whatever the nature of the learning rules in a particular species,there is no doubt that they are effective;it is very unusual to hear a wild bird singing a song which is not typical of its own species despite the many different songs which often occur in a small patch of woodland.14.Directions:An introductory sentence for a brief summary of the passage isprovided plete 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.A.Although only male chaffinches are able to sing in the wild,Thorpe found that he could teach hand-reared females to copy songs from recordings and live tutors.B.Chaffinches reared in isolation produce songs that differ significantly from those of normal birds,suggesting that some social influence is important for learning a song precisely.C.Birds vary a great deal with respect to both the variety of sounds they are able to learn and the conditions that must be present for them to be able to learn their species’song.D.Chaffinches that are exposed only to other bird species for the first few weeks of their life are likely to learn the songs of those species instead of the chaffinch song.E.Researchers believe that both the circuitry or a bird’s brain and its interactions with other birds of the same species may prevent birds from learning the songs of other species.F.The ability of deaf birds to produce their normal species’song suggests that genes play a much greater role than environment in determining the behavior of most bird species.The Role of DiapauseParagraph1If conditions within an organism’s environment occasionally or regularly become harsh,it may be advantageous for an organism to have a resistant stage built into the life cycle.In such a life history strategy,the organism suspends any growth, reproduction,or other activities for a period of time so that they may occur at a later, more hospitable time.This genetically determined resting stage,characterized by the cessation of development and protein synthesis and suppression of the metabolic rate, is called diapause.Many other kinds of resting stages,with different levels of suppression of physiological activities,are known.Some of these resistant stages can be extremely long-lived.In one case,seeds of the arctic lupine,a member of the pea family recovered from ancient lemming burrows in the Arctic,germinated in threedays even though they were carbon-dated at more than10,000years old!1.According to paragraph1,why do some organisms have a resting stage during their life cycle?A.To recover from injuries suffered during harsh conditionsB.To devote all of their energy to a period of growth and reproductionC.To wait for local conditions to become favorable for important life eventsD.To prepare to move to a different environment if conditions become harsh2.Why does the author mention“seeds of the arctic lupine”？A.To argue that members of the pea family are extremely resistant to cold temperaturesB.To provide information about what ancient lemmings ate during their long resting periodsC.To provide an example of an organism with a resting stage that has many different levels of suppression of physiological activities.D.To support the claim that some resting stages last an extremely long time Paragraph2Unfavorable conditions that are relatively predictable probably pose a simpler problem for organisms than do unpredictable conditions.Adaptations to the regular change of seasons in the temperate and polar regions may be relatively simple.For example,many seeds require a period of stratification,exposure to low temperatures for some minimum period,before they will germinate.This is a simple adaptation to ensure that germination occurs following the winter conditions rather than immediately prior to their onset.In contrast,unfavorable conditions that occur unpredictably pose considerable problems for organisms.In fact,unpredictability is probably a greater problem than is the severity of the unfavorable period.How can organisms cope with the unpredictable onset of good or poor conditions?3.According to paragraph2,why do many seeds require a period of stratification?A.To slowly build up a tolerance for lower and lower temperaturesB.To guarantee that the seeds grow after and not beforeC.To make sure that the seeds can deal with unpredictable conditionsD.To give the seeds enough time to germinate before winter begins4.The word“severity”in the passage is closest in meaning toA.lengthB.harshnessC.unexpectednesspletenessParagraph3Many adaptations to this general problem are based on a resting stage that awaitsfavorable conditions.We will consider two examples from the vertebrates.The first is the red kangaroo.This marsupial inhabits the deserts of central Australia where the onset of rains and the resulting sudden growth of vegetation are extremely unpredictable.Obviously,it is advantageous for a kangaroo female to produce young at a time when plant productivity is sufficient to support her offspring.For such a relatively large mammal,however,gestation(the period of development during pregnancy)is so long that if a female waited to mate and carry the young until after the rains came,the favorable period might be past.The kangaroo’s life history adaptation to this problem involves the use of embryonic diapause during gestation (development in the uterus).(第三段未直接出题，但主旨题可能考到里面的选项)Paragraph4After a31-day gestation period,the female gives birth to a tiny helplessyoung typical of marsupials.The newborn crawls into the mother’s pouch and attaches to a teat where it continues to grow and develop.After235days it leaves the pouch but remains with the mother and obtains milk from her.Two days after giving birth,the female mates again.The fertilized egg enters a204-day period of diapause during which it remains in the uterus but does not attach.It then implants,and31days later,birth of the second young occurs.Note that the first young leaves the pouch at just this time.Again,the female mates,fertilization occurs,and another diapause follows.The eventual result is that at any one time,the female has three young at various stages of development one in diapause,one in the pouch,and one outside the pouch.Among other benefits,this allows her to freeze the development of an embryo during times of drought and food shortage until the offspring in the pouch is able to leave.5.According to paragraph4,all of the following statements are true about the young offspring of the red kangaroo EXCEPT:A.After birth,a newborn crawls into the mother’s pouch where it grows and develops.B.After a young kangaroo leaves its mother’s pouch,it still needs its mother’s milk.C.A mother usually gives birth to three baby kangaroos at the same time.D.A baby kangaroo spends235days in the mother’s pouch after its birth.6.Paragraph4supports all of the following statements about the red kangaroo of central Australia EXCEPT:A.A female kangaroo mates again shortly after her newborn enters her pouch.B.During diapause,a young kangaroo stays in the female’s pouch and growth of a second fertilized egg inside the uterus is delayed.C.A female kangaroo can freeze the development of her young at each stage of their development.D.The adaptation of diapause enables female kangaroos to ensure the survival of theiryoung during periods of environmental stress.7.What is the main purpose of paragraph4in the passage?A.To give the details of an adaptation mentioned in paragraph3B.To describe an adaptation different from the one explained in paragraph3C.To introduce an adaptation that is described in detail in paragraph5D.To discuss an adaptation that is not as successful as the one discussed in paragraph 5Paragraph5A similar strategy-accelerated development combined with a resting stage-has also allowed amphibians to inhabit deserts.The spadefoot toads,such as Couch’s spadefoot toad,inhabit some of the most severe deserts in North America.Adults of this species burrow deeply into the substrate where it is cooler and perhaps more moist.Here they enter into a resting state in which they are covered with a protective layer of dead skin.When it rains,the adults emerge and congregate to mate at temporary ponds.Development is greatly accelerated:the eggs hatch within48hours, and the tadpoles change into toads at16-18days.Consequently,they can complete the life cycle during the brief window of favorable conditions,then return to the resistant resting stage to await the next rainfall.Resting stages thus comprise a series of adaptations that allow the species to avoid the most difficult conditions for life.8.The word“congregate“in the passage is closest in meaning toA.beginB.gatherC.hurryD.Expect9.The word“Consequently“in the passage is closest in meaning toA.EventuallyB.In additionC.As a resultD.However10.The word“comprise”in the passage is closest in meaning toA.consist ofB.bring aboutC.are similar toD.take the place of11.According to paragraph5,how do amphibians such as spadefoot toad survive the severe heat conditions in the North American deserts?A.They dig down into the ground and go into a resistant resting state.B.They remain in the ponds that develop after it has rained.C.They lose their outer layer of skin.D.Their eggs lie dormant until the desert air becomes cooler and more moist.12.According to paragraph5,which of the following occurs during the life cycle of the spadefoot toad?A.The female’s’eggs hatch under the surface of the desert.B.The adults mate during the dry period.C.The newborn grows into an adult before unfavorable conditions.D.The newborn enters a resting stage before it becomes an adult.13.Look at the four squares[■]that indicate where the following sentence could be added to the passage.Where would the sentence best fit?Such adaptations to predictable conditions can also be made by animals,such as by hibernating during the coldest months.Unfavorable conditions that are relatively predictable probably pose a simpler problem for organisms than do unpredictable conditions.Adaptations to the regular change of seasons in the temperate and polar regions may be relatively simple.For example,many seeds require a period of stratification,exposure to low temperatures for some minimum period,before they will germinate.■This is a simple adaptation to ensure that germination occurs following the winter conditions rather than immediately prior to their onset.■In contrast,unfavorable conditions that occur unpredictably pose considerable problems for organisms.■In fact,unpredictability is probably a greater problem than is the severity of the unfavorable period.■How can organisms cope with the unpredictable onset of good or poor conditions?14.Directions:An introductory sentence for a brief summary of the passage is provided 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 the express ideas that are not presented in the passage or are minor ideas in the passage.This question is worth2points.Some organisms adapt to periodic harsh conditions by building a resistant stage,or diapause,into their life cycle.A.The diapause stage evolved very early and is most common in species that first appeared more than10,000years ago.B.Unpredictable conditions are more problematic for organisms than are fairly predictable changes such as the seasons.C.The female red kangaroo adapts to unfavorable conditions by delaying the development of her fertilized egg until an embryo would be able to move into the pouch.D.Some seeds may germinate in three days even if they have been exposed to very low temperatures for a long time.E.Some marsupials can care for three newborns in their pouch at the same time,allowing the young to leave the pouch only when conditions are favorable for their growth.F.Some amphibians adapt to desert life by combining accelerated development with resting stages deep underground.第三篇The Plow and the Horse in Medieval Europe同2015年混编第一套中的第二篇1.Birdsong答案：CCDCC,ADBAD,CCB（BCE）2.The Role of Diapause答案：1.C2.D3.B4.B5.C6.C7.A8.B9.C10.A11.A 12.C13.B14.B C F。
托福TPO第27套阅读真题翻译及生词解析
托福TPO第27套阅读真题翻译及生词解析最新托福真题TPO第27套阅读第一篇，文章反映了托福“古代社会文明”类型的阅读的特点，阅读中的学科词汇很典型，对我们准备托福的阅读有很重要的参考意义，备战托福的同学不可错过。
【学科词汇总结words】craft手工艺urban城市的civilization 文明settlement定居点agriculture农业pottery实用陶器textile纺织品mold模具carve雕刻relief浮雕clay粘土utilitarian实用的elaborate精心制作的refined精制的【文章翻译translation】一、人类历史上的第一个城市乌鲁克兴起。
Some of the earliest human civilizations arose in southern Mesopotamia, in what is now southern Iraq, in the fourth millennium B.C.E. In the second half of that millennium, in the south around the city of Uruk, there was an enormous escalation in the area occupied by permanent settlements. A large part of that increase took place in Uruk itself, which became a real urban center surrounded by a set ofsecondary settlements. While population estimates arenotoriously unreliable, scholars assume that Uruk inhabitants were able to support themselves from the agricultural production of the field surrounding the city, which could be reached with a daily commute. But Uruk’s dominant size in the entire region, far surpassing that of other settlements, indicates that it was a regional center and a true city. Indeed, it was the first city in human history. 一些人类最早的文明崛起于公元前四千年的米索达比亚的南部（如今的伊拉克南部）。
【托福写作资料】TPO27综合写作文本与解析
【托福写作资料】TPO27综合写作文本与解析TPO综合写作范文是考生练习托福写作的必备资料，很多考生在网上求这份资料。
那么，在以下内容中，就为大家带TPO综合写作文本与解析，希望能为大家的备考带来帮助。
托福TPO27综合写作题目 Reading Part:The little ice age was a period of unusually cold temperature in many partsof the world that lasted from about the year 1350 until 1900CE. There wereunusually harsh winters, and glaciers grew larger in many areas. Scientist havelong wondered what caused the Little Ice Age. Several possible causes have beenproposed.First, the cooling may have been caused by disrupting of ocean currents.Before the Little Ice Age, there was a period of unusually warm weather duringwhich glaciers melted. These melted glaciers sent a large amount of coldfreshwater into the Gulf Stream, a large ocean current that strongly affectsEarth’s climate. Some scientists believe that this freshwater was enough totemporarily disrupt the Gulf Stream. Such a disruption could have caused theLittle Ice Age.Second, volcanic eruption could have caused the Little Ice Age. Whenvolcanoes erupt, they send dark clouds of dust and sulfur gas into theatmosphere. These clouds, which can spread over great areas, block some sunlightfrom reaching Earth’s surface. This can decrease the global temperatures.Scientists know of several volcanic eruption that took place during the LittleIce Age.Third, substantial decreases in human populations may have contributedindirectly to the cooling of the climate. For a variety of reason(disease, warfare, social disruption), the human population just before the Little Ice Age and during the early part of it was lower than it had been in a long time.Forest trees started growing on fields that were no longer used for agriculture.Since trees absorb carbon dioxide, a greenhouse gas, they decrease thegreenhouse effect that keeps Earth warm. With more forest trees carbon dioxide, earth became cooler.托福TPO27综合写作题目 Listening Part:Unfortunately，the arguments of the reading passage are a little out of date.Scientists now have new information that shows that none of the ideas the reading passage discusses could account for the Little Ice Age.First，about the Gulf Stream.Scientists now know that disrupting the Gulf Stream would cause cooling only in Europe and North America，but the Little Ice Age also affected the Southern hemisphere，in places like New Zealand and Southern Africa for example.Since the disruption of the Gulf Stream cannot explain why these southern areas became colder，it cannot explain the Little Ice Age.Second, the volcanoes theory.It’s true that if volcanic eruptions put enoughdust into the atmosphere.the result can be a cooler climate.But large amounts ofvolcanic dust in the atmosphere would have also produced striking visual effectthat people would have noticed at the time.For example.Dramatically colorfulSunsets or snow being grey or brown instead of white.But there are almost no reports of anything like that routinely happening during the Little Ice Age.So it seems that the volcanic eruptions during that period were simply not strong enough to release the large amounts of dust needed to lower globaltemperatures.Third, about forests on farmland stopping the warming greenhouse effect by removing carbon dioxide.There just was not enough time for this effect to work.The human population grew back to previous levels fairly quickly，which meant that forests were soon being cut down again to clear fields for the crops needed to feed the growing population.As a result，we know that the forests mentioned in the reading passage were not there long enough to cause the long—term global cooling of the climate.托福TPO27综合写作题目 Question:Summarize the point made in the lecture ， being sure to explain how the cast doubt on specific points made in the reading passage.托福TPO27综合写作答案解析：In the reading passage, the author claims that the cause of the Little IceAge was due to three main reasons. The lecturer, however, reputes the writer’sopinion one by one with strong arguments.Firstly, the passage argues that the Gulf Stream formed in the previous warmperiod was responsible for the appearance of the unexpected Little Ice Age. Yet, the speaker argues that the so-called Gulf Stream only contributed to the cooling weather in Northern hemisphere while Little Ice Age took place all over the world. Thus, global Little Ice Age cannot be Next, according to the reading material, dust and sulfur gas caused by volcanic eruptions would block sunlight, and resulted in Little Ice Age. he lecturer, however, holds that volcanic eruptions should have led to other visual phenomena than cooling weather, like colorful sunsets or grey snow. But unfortunately none of them were reported. Once taken this into consideration, volcanic eruptions seems not strong enough to release the large amounts of dusts needed to lower global temperatures. Last but not least, the writer states that the substantial decrease in human population may cause the unusual Little Ice Age. Again the speaker argues.。
托福阅读真题第27套
第27套BirdsongParagraph1Birdsong is the classic example of how genes(hereditary information)and environment both have a crucial role to play in the behavioral development of animals. Since the pioneering work of W.H.Thorpe on chaffinches(a common European bird), many species have been studied,and it has become clear both that learning plays an important role for all species and also that there are constraints on what they are able to learn.1.The word“pioneering”in the passage is closet in meaning torecentfamousoriginalcontroversialParagraph2Thorpe was able to show that learning from others was involved in chaffinch birds through a series of experiments on hand-reared chicks(young birds).As in most other species,only the males sing.Thorpe found that,if he raised young males in total isolation from all others,the song they produced was quite different from that of a normal adult.It was about the right length and in the correct frequency range.It was also split up into a series of notes as it should be.But these notes lacked the detailed structure found in wild birds,nor was the song split up into distinct phrases as it usually is.This suggested that song development requires some social ter experiments in which researchers played recordings of songs to young birds showed just how precise this influence was:many of them would learn the exact pattern of the recording they had heard.A remarkable feature here was that birds were able to copy precisely songs that they only heard in the first few weeks of life,yet they did not sing themselves until about eight months old.They are thus able to store a memory of the sound within their brain and then match their own output to their recollection of it when they mature.2.The word“distinct”in the passage is closet in meaning toshortsimpleseparatesimilar3.According to paragraph2,all of the following are characteristics of the songs ofthe young chaffinches in Thorpe’s experiment EXCEPT:They were not identical to the songs of normal adult chaffinches.They lacked the complex form of the songs of wild chaffinches.They were as long as the songs of normal adult chaffinches.They were clearly different from each other.4.According to paragraph2,researchers discovered which of the following byplaying recordings of songs to chaffinches?Chaffinches could no longer be taught to reproduce sounds after the first few weeks of life.Chaffinches could not reproduce songs with exactly the same patterns of recorded songs.Chaffinches at the age of eight months could recall and reproduce a song that they heard in the first few weeks of life.Chaffinches that learned a song from recordings in the first few weeks of life were later unable to copy the sounds of mature chaffinches.5.All of the following are mentioned in paragraph2as characteristics of wildchaffinches EXCEPT:They are able to copy songs very precisely.Their song development requires interaction with other chaffinches.Their songs are not as well-structured as the songs of other birds.It is the males of the species that do the singing.Paragraph3Young chaffinches normally learn only chaffinch song,though Thorpe found they could be trained to sing the song of a tree pipit(another type of bird),which is very similar to that of their own species.In general,however,the constraints on learning which birds have ensure that they only learn songs appropriate to the species to which they themselves belong.These constraints may be in their brain’s circuitry,the young bird hatching with a rough idea of the sounds that it should copy.The crude song of a bird reared in isolation gives some clues as to what this rough idea may be:the length, the frequency range and the breaking up into notes are all aspects of chaffinch song shared between normal birds and those reared in isolation.In other cases the constraints are more social,young birds only being prepared to learn from individuals with whom they have social interactions.Thus,in a number of species,it has been found that they will not copy from recordings,but will do so from a live tutor.In some cases this may occur when they are young birds,but in others the main learning period is when they set up their territories and interact with neighbors for the first time,enabling them to match their neighbor’s songs and so countering with them. Whatever the nature of the learning rules in a particular species,there is no doubt that they are effective;it is very unusual to hear a wild bird singing a song which is not typical of its own species despite the many different songs which often occur in a small patch of woodland.6.The word“enabling”in the passage is closet in meaning toallowingchallengingforcingpreparing7.It can be inferred from paragraph3that one of the functions of songs in birds is to bring together birds living in groups with birds living in isolationhelp young birds distinguish other young birds from adultsmake possible interactions between birds of different specieshelp birds to establish territories8.Which of the sentences below best expresses the essential information in thehighlighted sentence in the passage?Incorrect choices change the meaning in important ways or leave out essential information.Songs produced by chaffinches reared in isolation are cruder than the songs of wild birds.The song of a bird reared in isolation suggests which aspects of chaffinch song may be inborn.Comparing the crude songs of chaffinches reared in isolation to the songs of wild chaffinches suggests differences as well as similarities.Studying the song aspects of chaffinches reared in isolation,researchers have gained a better understanding of the songs produced by wild birds.9.According to paragraph3,in some species,young birds do not copy songs fromrecordings becausethey learn to sing only by live interactions with other birdstheir ability to learn from recordings occurs later in lifethey can only learn the songs of the birds living in their area of woodlandthey can only learn songs from other birds of their own species10.Why does the author mention that it is very unusual to hear a wild bird singing asong which is not typical of its own species?To explain why a variety of different bird songs are often heard in a relatively small areaTo argue that social constraints have a greater impact upon learning than do genetic constraintsTo provide an example of how the process of learning rules varies from one species to anotherTo illustrate how effective the different constraints upon learning are in young birdsParagraph4However,not all birds show the same learning pattern as do chaffinches.There are some species which produce normal sounds even if deaf,so that they cannot hear their own efforts,much less copy those of others.The cooing of doves and the crowing ofcocks are examples here.In other cases,such as parrots and hill mynahs,birds can be trained to copy a huge variety of sounds,though those they learn in the wild are usually more restricted.The amazing capability of mynahs has apparently arisen simply because birds in an area learn a small number of their calls from each other, males from males and females from females,and these calls are highly varied in structure.The ability to master them has led the birds,incidentally,to be capable of saying“hello”and mimicking a wide variety of other sounds.11.The word“restricted”in the passage is closet in meaning toimportantpopularlimitedaccurate12.According to paragraph4,why are mynahs able to learn to make a wide variety ofsounds?They have the ability to imitate any sound that they are exposed to.The frequency with which mynahs travel from one small area to another exposes them to a wide variety of sounds.They are exposed in the wild to calls that are very different from each other.An acute sense of hearing allows them to listen to and copy many different sounds.13.Look at the four squares[■]that indicate where the following sentence can beadded to the passage.Are these constraints genetic,environmental,or both?Where would the sentence best fit?Click on a square[■]to add the sentence to the passage.Paragraph3Young chaffinches normally learn only chaffinch song,though Thorpe found they could be trained to sing the song of a tree pipit(another type of bird),which is very similar to that of their own species.■In general,however,the constraints on learning which birds have ensure that they only learn songs appropriate to the species to which they themselves belong.■These constraints may be in their brain’s circuitry,the young bird hatching with a rough idea of the sounds that it should copy.■The crude song of a bird reared in isolation gives some clues as to what this rough idea may be: the length,the frequency range and the breaking up into notes are all aspects of chaffinch song shared between normal birds and those reared in isolation.■In other cases the constraints are more social,young birds only being prepared to learn from individuals with whom they have social interactions.Thus,in a number of species,it has been found that they will not copy from recordings,but will do so from a livetutor.In some cases this may occur when they are young birds,but in others the main learning period is when they set up their territories and interact with neighbors for the first time,enabling them to match their neighbor’s songs and so countersing with them.Whatever the nature of the learning rules in a particular species,there is no doubt that they are effective;it is very unusual to hear a wild bird singing a song which is not typical of its own species despite the many different songs which often occur in a small patch of woodland.14.Directions:An introductory sentence for a brief summary of the passage isprovided plete 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.A.Although only male chaffinches are able to sing in the wild,Thorpe found that he could teach hand-reared females to copy songs from recordings and live tutors.B.Chaffinches reared in isolation produce songs that differ significantly from those of normal birds,suggesting that some social influence is important for learning a song precisely.C.Birds vary a great deal with respect to both the variety of sounds they are able to learn and the conditions that must be present for them to be able to learn their species’song.D.Chaffinches that are exposed only to other bird species for the first few weeks of their life are likely to learn the songs of those species instead of the chaffinch song.E.Researchers believe that both the circuitry or a bird’s brain and its interactions with other birds of the same species may prevent birds from learning the songs of other species.F.The ability of deaf birds to produce their normal species’song suggests that genes play a much greater role than environment in determining the behavior of most bird species.The Role of DiapauseParagraph1If conditions within an organism’s environment occasionally or regularly become harsh,it may be advantageous for an organism to have a resistant stage built into the life cycle.In such a life history strategy,the organism suspends any growth, reproduction,or other activities for a period of time so that they may occur at a later, more hospitable time.This genetically determined resting stage,characterized by the cessation of development and protein synthesis and suppression of the metabolic rate, is called diapause.Many other kinds of resting stages,with different levels of suppression of physiological activities,are known.Some of these resistant stages can be extremely long-lived.In one case,seeds of the arctic lupine,a member of the pea family recovered from ancient lemming burrows in the Arctic,germinated in threedays even though they were carbon-dated at more than10,000years old!1.According to paragraph1,why do some organisms have a resting stage during their life cycle?A.To recover from injuries suffered during harsh conditionsB.To devote all of their energy to a period of growth and reproductionC.To wait for local conditions to become favorable for important life eventsD.To prepare to move to a different environment if conditions become harsh2.Why does the author mention“seeds of the arctic lupine”？A.To argue that members of the pea family are extremely resistant to cold temperaturesB.To provide information about what ancient lemmings ate during their long resting periodsC.To provide an example of an organism with a resting stage that has many different levels of suppression of physiological activities.D.To support the claim that some resting stages last an extremely long time Paragraph2Unfavorable conditions that are relatively predictable probably pose a simpler problem for organisms than do unpredictable conditions.Adaptations to the regular change of seasons in the temperate and polar regions may be relatively simple.For example,many seeds require a period of stratification,exposure to low temperatures for some minimum period,before they will germinate.This is a simple adaptation to ensure that germination occurs following the winter conditions rather than immediately prior to their onset.In contrast,unfavorable conditions that occur unpredictably pose considerable problems for organisms.In fact,unpredictability is probably a greater problem than is the severity of the unfavorable period.How can organisms cope with the unpredictable onset of good or poor conditions?3.According to paragraph2,why do many seeds require a period of stratification?A.To slowly build up a tolerance for lower and lower temperaturesB.To guarantee that the seeds grow after and not beforeC.To make sure that the seeds can deal with unpredictable conditionsD.To give the seeds enough time to germinate before winter begins4.The word“severity”in the passage is closest in meaning toA.lengthB.harshnessC.unexpectednesspletenessParagraph3Many adaptations to this general problem are based on a resting stage that awaitsfavorable conditions.We will consider two examples from the vertebrates.The first is the red kangaroo.This marsupial inhabits the deserts of central Australia where the onset of rains and the resulting sudden growth of vegetation are extremely unpredictable.Obviously,it is advantageous for a kangaroo female to produce young at a time when plant productivity is sufficient to support her offspring.For such a relatively large mammal,however,gestation(the period of development during pregnancy)is so long that if a female waited to mate and carry the young until after the rains came,the favorable period might be past.The kangaroo’s life history adaptation to this problem involves the use of embryonic diapause during gestation (development in the uterus).(第三段未直接出题，但主旨题可能考到里面的选项)Paragraph4After a31-day gestation period,the female gives birth to a tiny helplessyoung typical of marsupials.The newborn crawls into the mother’s pouch and attaches to a teat where it continues to grow and develop.After235days it leaves the pouch but remains with the mother and obtains milk from her.Two days after giving birth,the female mates again.The fertilized egg enters a204-day period of diapause during which it remains in the uterus but does not attach.It then implants,and31days later,birth of the second young occurs.Note that the first young leaves the pouch at just this time.Again,the female mates,fertilization occurs,and another diapause follows.The eventual result is that at any one time,the female has three young at various stages of development one in diapause,one in the pouch,and one outside the pouch.Among other benefits,this allows her to freeze the development of an embryo during times of drought and food shortage until the offspring in the pouch is able to leave.5.According to paragraph4,all of the following statements are true about the young offspring of the red kangaroo EXCEPT:A.After birth,a newborn crawls into the mother’s pouch where it grows and develops.B.After a young kangaroo leaves its mother’s pouch,it still needs its mother’s milk.C.A mother usually gives birth to three baby kangaroos at the same time.D.A baby kangaroo spends235days in the mother’s pouch after its birth.6.Paragraph4supports all of the following statements about the red kangaroo of central Australia EXCEPT:A.A female kangaroo mates again shortly after her newborn enters her pouch.B.During diapause,a young kangaroo stays in the female’s pouch and growth of a second fertilized egg inside the uterus is delayed.C.A female kangaroo can freeze the development of her young at each stage of their development.D.The adaptation of diapause enables female kangaroos to ensure the survival of theiryoung during periods of environmental stress.7.What is the main purpose of paragraph4in the passage?A.To give the details of an adaptation mentioned in paragraph3B.To describe an adaptation different from the one explained in paragraph3C.To introduce an adaptation that is described in detail in paragraph5D.To discuss an adaptation that is not as successful as the one discussed in paragraph 5Paragraph5A similar strategy-accelerated development combined with a resting stage-has also allowed amphibians to inhabit deserts.The spadefoot toads,such as Couch’s spadefoot toad,inhabit some of the most severe deserts in North America.Adults of this species burrow deeply into the substrate where it is cooler and perhaps more moist.Here they enter into a resting state in which they are covered with a protective layer of dead skin.When it rains,the adults emerge and congregate to mate at temporary ponds.Development is greatly accelerated:the eggs hatch within48hours, and the tadpoles change into toads at16-18days.Consequently,they can complete the life cycle during the brief window of favorable conditions,then return to the resistant resting stage to await the next rainfall.Resting stages thus comprise a series of adaptations that allow the species to avoid the most difficult conditions for life.8.The word“congregate“in the passage is closest in meaning toA.beginB.gatherC.hurryD.Expect9.The word“Consequently“in the passage is closest in meaning toA.EventuallyB.In additionC.As a resultD.However10.The word“comprise”in the passage is closest in meaning toA.consist ofB.bring aboutC.are similar toD.take the place of11.According to paragraph5,how do amphibians such as spadefoot toad survive the severe heat conditions in the North American deserts?A.They dig down into the ground and go into a resistant resting state.B.They remain in the ponds that develop after it has rained.C.They lose their outer layer of skin.D.Their eggs lie dormant until the desert air becomes cooler and more moist.12.According to paragraph5,which of the following occurs during the life cycle of the spadefoot toad?A.The female’s’eggs hatch under the surface of the desert.B.The adults mate during the dry period.C.The newborn grows into an adult before unfavorable conditions.D.The newborn enters a resting stage before it becomes an adult.13.Look at the four squares[■]that indicate where the following sentence could be added to the passage.Where would the sentence best fit?Such adaptations to predictable conditions can also be made by animals,such as by hibernating during the coldest months.Unfavorable conditions that are relatively predictable probably pose a simpler problem for organisms than do unpredictable conditions.Adaptations to the regular change of seasons in the temperate and polar regions may be relatively simple.For example,many seeds require a period of stratification,exposure to low temperatures for some minimum period,before they will germinate.■This is a simple adaptation to ensure that germination occurs following the winter conditions rather than immediately prior to their onset.■In contrast,unfavorable conditions that occur unpredictably pose considerable problems for organisms.■In fact,unpredictability is probably a greater problem than is the severity of the unfavorable period.■How can organisms cope with the unpredictable onset of good or poor conditions?14.Directions:An introductory sentence for a brief summary of the passage is provided 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 the express ideas that are not presented in the passage or are minor ideas in the passage.This question is worth2points.Some organisms adapt to periodic harsh conditions by building a resistant stage,or diapause,into their life cycle.A.The diapause stage evolved very early and is most common in species that first appeared more than10,000years ago.B.Unpredictable conditions are more problematic for organisms than are fairly predictable changes such as the seasons.C.The female red kangaroo adapts to unfavorable conditions by delaying the development of her fertilized egg until an embryo would be able to move into the pouch.D.Some seeds may germinate in three days even if they have been exposed to very low temperatures for a long time.E.Some marsupials can care for three newborns in their pouch at the same time,allowing the young to leave the pouch only when conditions are favorable for their growth.F.Some amphibians adapt to desert life by combining accelerated development with resting stages deep underground.第三篇The Plow and the Horse in Medieval Europe同2015年混编第一套中的第二篇1.Birdsong答案：CCDCC,ADBAD,CCB（BCE）2.The Role of Diapause答案：1.C2.D3.B4.B5.C6.C7.A8.B9.C10.A11.A 12.C13.B14.B C F。
TPO-27 Reading 2解析
Q1正确答案：C解析：题干中的词组是段落第4句中tectonic plate（地壳板块）的三种edges （边缘）现象的详细解释，段落第1句也说到板块组成像拼图，也可以看出是要体现其复杂性，C正确。
原文未提到neat, thin lines，排除A；第4句并没有解释why some tectonic plates carry islands… 排除B；第4句中是对3个板块现象的解释，不是举例，排除D。
Q2正确答案：D解析：第4句描述了三种现象，一种是move closer，一种是move apart，对第三种的描写是neither… nor…，因此应该是与前两种都不同，所以应该是既不聚合，也不分开，根据词根可以判断diverge是“分开”，所以converge是“汇集，聚集，集中”，答案是D。
Q3正确答案：C解析：高亮句的主干意思是“太平洋地图暴露出许多实际上是火山的岛屿，它们源于太平洋板块内部的活动”，C正确。
Q4正确答案：C解析：instructive，富有教义的，增长知识的；近义词是informative，提供信息的，增长见闻的。
第三段第1句是个问句，第2句说夏威夷群岛提供了怎样的解答，整段叙述讲的就是这个解答，可以推出符合段意和逻辑的答案是informativeQ5正确答案：A解析：“不同的岛屿看起来经历了相似的演变过程，但有些随着时间愈发推移而更被……，所以可能更古老。
”那么岛屿如果经历的时间更长应该会被海水“侵蚀”得更厉害，所以答案选worn down，磨损。
scattered，分散的，developed，发达的，成熟的；deserted，被遗弃的。
Q6正确答案：A解析：根据两个科学家的名字进行定位。
从In the 1840s 这句话知道Daly的贡献，包括观察到一些岛屿are progressively more eroded and older，下一句Then in 1963这句可以了解到Wilson发现了这种岛屿的age aggression形成的条件（if the islands were formed on…）,也就是Wilson 发现了Daly观察到的现象发生的原因，A正确。
托福阅读推理题
➢The author of the passage implies that . . .
2. 做题方法
2 做题方法
Ⅹ 错误选项：与文章主要观点矛盾或原文无出处 ✓ 正确选项：能在文章中找到依据
2.1 真题演练一
TPO27-PASSAGE1 ： Paragraph 2: The vast majority of its population remained active in agriculture, even those people living within the city itself. But a small segment of the urban society started to specialize in nonagricultural tasks as a result of the city’s role as a regional center. Within the productive sector, there was a growth of a variety of specialist craftspeople . Early in the Uruk period, the use of undecorated utilitarian pottery was probably the result of specialized mass production.
3. 推理题练习
讲义：p100-107
1.出题原则 2.错误选项特点 3.推理能力
总结：如何做推断题
找依据—找出处—排除矛盾
2. In paragraph 4, what does the author imply about modern buildings? ○They occupy much less space than buildings constructed one hundred years ago. ○They are not very different from the building of a few generations ago. ○They weigh less in relation to their size than buildings constructed one hundred years ago. ○They take a long time to build as a result of their complex construction methods.
托福阅读tpo27R-3原文+译文+题目+答案+背景知识
托福阅读tpo27R-3原文+译文+题目+答案+背景知识原文 (1)译文 (4)题目 (6)答案 (15)背景知识 (16)原文Predator-Prey Cycles①How do predators affect populations of the prey animals?The answer is not as simple as might be thought.Moose reached Isle Royale in Lake Superior by crossing over winter ice and multiplied freely there in isolation without predators.When wolves later reached the island, naturalists widely assumed that the wolves would play a key role in controlling the moose population.Careful studies have demonstrated, however,that this is not the case.The wolves eat mostly old or diseased animals that would not survive long anyway.In general,the moose population is controlled by food availability,disease and other factors rather than by wolves.②When experimental populations are set up under simple laboratoryconditions,the predator often exterminates its pre and then becomes extinct itself,having nothing left to eat.However,if safe areas like those prey animals have in the wild are provided,the prey population drops to low level but not extinction.Low prey population levels then provide inadequate food for the predators,causing the predator population to decrease.When this occurs,the prey population can rebound.In this situation the predator and prey population may continue in this cyclical pattern for some time.③Population cycles are characteristic of small mammals,and they sometimes appear to be brought about by predators.Ecologists studying hare populations have found that the North American snow shoe hare follows a roughly ten-year cycle.Its numbers fall tenfold to thirty in a typical cycle,and a hundredfold change can occur.Two factors appear to be generating the cycle:food plants and predators.④The preferred foods of snowshoe hares are willow and birch twigs.As hare density increases,the quantity of these twigs decreases,forcing the hares to feed on low-quality high-fiber food.Lower birth rates,low juvenile survivorship,and low growth rates follow,so there is a corresponding decline in hare abundance.Once the hare population has declined,it takes two to three year for the quantity of twigs to recover.⑤A key predator of the snowshoe hare is the Canada lynx.The Canadalynx shows a ten-year cycle of abundance that parallels the abundance cycle of hares.As hare numbers fall,so do lynx numbers,as their food supply depleted.⑥What causes the predator-prey oscillations?Do increasing number of hares lead to overharvesting of plants,which in turn results in reduced hare populations,or do increasing numbers of lynx lead to overharvesting hares?Field experiments carried out by Charles Krebs and coworkers in1992provide an answer.Krebs investigated experimental plots in Canada’s Yukon territory that contained hare populations.When food was added to those plots(no food effect)and predators were excluded(no predator effect)from an experimental area, hare numbers increased tenfold and stayed there—the cycle was lost. However,the cycle was retained if either of the factors was allowed to operate alone:if predators were excluded but food was not added(food effect alone),or if food was added in the presence of predators (predator effect alone).Thus both factors can affect the cycle,which,in practice,seems to be generated by conjunction of the two factors.⑦Predators are an essential factor in maintaining communities that are rich and diverse in species.Without predators,the species that is the best competitor for food,shelter,nesting sites,and other environmental resources tends to dominate and exclude the species with which itcompetes.This phenomenon is known as“competitor exclusion”. However,if the community contains a predator of the strongest competitor species,then the population of that competitor is controlled. Thus even the less competitive species are able to survive.For example, sea stars prey on a variety of bivalve mollusks and prevent these bivalves from monopolizing habitats on the sea floor.This opens up space for many other organisms.When sea stars are removed,species diversity falls sharply.Therefore,from the stand point of diversity,it is usually a mistake to eliminate a major predator from a community.译文捕食周期①捕食者是怎样影响被捕食者的数量呢？答案并不是想象中那么简单。
托福阅读句子简化题怎么做
托福阅读句子简化题怎么做托福阅读句子简化题怎么做?实用解题思路分享，今天给大家带来了托福阅读句子简化题怎么做,希望可以帮助到大家，下面就和大家分享，来欣赏一下吧。
托福阅读句子简化题怎么做?实用解题思路分享托福阅读句子简化题解题思路分析句子简化题其实是货真价实的Paraphrase，一般就是给出长难句，让选择跟原文意思最为相近的选项。
这种题需要一定的把握长难句的能力，也需要一定的语法基础。
如果考过GMAT的，做惯了Sentence Correction的同学应该觉得不太难。
这种题还需要多练习，也从技巧的角度来作出一些解释。
按照托福官方指南OG的解释是，错误选项通常犯了如下两个错误：一是与原文意思相悖，二是漏掉了原文重要的内容。
要解决这个问题，首先应该把句子的主要成分，即主谓宾按照小学时候学过的缩句方法提炼出来，明白句子的主要意思，再到选项中去找合适的。
选的时候一定要再三斟酌，切忌看了某一个选项就做出决定而不管其它三个。
托福阅读句子简化题实例讲解用官方指南OG29页例题举例，把原句缩句：Since laws have determined form, forms can vary within certain limits. 其中B选项忽略掉了forms can vary…的意思;C，D选项后半句的意思跟原文相反;分别都犯了上述两种错误之一。
所以选A。
只要能准确把握原文的意思，难度不大。
如果时间足够充足，我建议用GMAT的SC部分来锻炼把握长难句的能力，对阅读也有好处。
不过大概需要1到2周的时间，不适合于时间紧张的考生。
托福阅读题最重要的是找到阅读段的主题句，分析出出题者的意图，然后根据*关键词进行答题。
考生在做托福阅读题的时候需要重视开头段，结尾段和过渡段，在这三个地方，一般会包含着托福阅读段的真实题义。
想要在托福阅读中考出理想成绩，除了对题型、解题技巧有深入了解之外，更重要的是平时多看多练，才能在考试中灵活的使用解题技巧。
TPO 27-R2-Solution
TPO 27 R-2Q1 The author mentions “spreading ridges”, ”subduction zones”, and “transform faults” in order toA.illustrate that the boundaries of tectonicplates are neat, thin linesB.explain why some tectonic plates carryislands or continents while others form the seafloorC.explain the complex nature of the edges oftectonic platesD.provide examples of areas of tectonicplates where little geologic action occurs Q2 The word “converge”in the passage is closet in meaning toA.expandB.formC.riseD.move closerQ3 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 informationA.Volcanic activity is responsible for theformation of the Pacific seafloor in the interior of the Pacific Plate.B.Many volcanoes in the Pacific Ocean areno longer active and have become islands that support coral.C.There are many islands in the PacificOcean that originated as volcanoes in the interior of the Pacific Plate.D.The map of the Pacific Ocean reveals fewervolcanic islands than there truly are because many are no longer active and some are completely overgrown withThe Formation of Volcanic Islands Earth’s surface is not made up of a single sheet of rock that forms a crust but rather a number of “tectonic plates” that fit closely, like the pieces of a giant jigsaw puzzle. Some plates carry islands or continents, others form the seafloor. All are slowly moving because the plates float on a denser semiliquid mantle, the layer between the crust and Earth’s core. The plates have edges that are spreading ridges (where two plates are moving apart and new seafloor is being created), subduction zones (where two plates collide and one plunges beneath the other), or transform faults (where two plates neither converge nor diverge but merely move past one another). It is at the boundaries between plates that most of Earth’s volcanism and earthquake activity occur.Generally speaking, the interiors of plates are geologically uneventful. However, there are exceptions. A glance at a map of the Pacific Ocean reveals that there are many islands far out at sea that are actually volcanoes—many no longer active, some overgrown with coral—that originated from activity at points in the interior of the Pacific Plate that forms the Pacific seafloor.coral.Q4 The word “instructive”in the passage is closet in meaning toA.clearB.detailedrmativeD.familiarQ5 The word “eroded” in the passage is closest in meaning toA.worn downB.scatteredC.developedD.desertedQ6 In paragraph 3, what is the relationship between the scientific contribution of James Daly and Tuzo Wilson?A.Wilson provided an explanation for theobservations made by DalyB.Wilson challenged the theory proposed byDalyC.Wilson found numerous examples ofisland chains that supported Daly’s theory D.Wilson popularized the explanation ofvolcanic island formation formulated by DalyParagraph 3 is marked with an arrow>Q7 Why does the author provide the information that “the dating of lavas in the Hawaii (and other) chains showed that their ages increase away from the presently active volcano”?A.To point out differences between theHawaii Island chain and other volcanic island chains.B.To question the idea that all the islands inan island chain have been formed by volcanic activity.C.To explain why Wilson hypothesis wasinitially difficult to accept. >How can volcanic activity occur so far from a plate boundary? The Hawaiian Islands provide a very instructive answer. ■Like many other island groups, they form a chain. ■The Hawaiian Islands Chain extends northwest from the island of Hawaii. ■In the 1840s American geologist James Daly observed that the different Hawaii Islands seem to share a similar geologic evolution but some are progressively more eroded, and therefore probably older, toward the northwest. ■Then in 1963, in the early days of the development of the theory of plate tectonics, Canadian geophysicist Tuzo Wilson realized that this age progression could result if the islands were formed on a surface plate moving over a fixed volcanic source in the interior.Wilson suggested that the long chain of volcanoes stretching northwest from Hawaii is simply the surface expression of a long-lived volcanic source located beneath the tectonic plate in the mantle. Today’s most northwest island would have been the first to form. Then, as the plate moved slowly northwest, new volcanic islands would have formed as the plate moved over the volcanic source. The most recent island, Hawaii, would be at the end of the chain and is now over the volcanic source.>Although this idea was not immediately accepted, the dating of lavas in the Hawaii (and other) chains showed that their ages increase away from the presently active volcano, just as Daly had suggested. Wilson’s analysis of these data is now a central part of plate tectonics. Most volcanoes that occur inD.To provide evidence in support of Daly’sand Wilson’s ideas about how the Hawaii Islands were formed.Q8 According to paragraph 4, which of the following is true of mantle plumesA.They exist close to the surface of tectonicplates.B.They cause most of the volcanic activitythat occurs in the interiors of platesC.They are rarely active for long periods oftime.D.They get increasingly older away from thepresent hot spotsParagraph 4 is marked with an arrow>Q9 According to paragraph 5, volcanic islands help geologists toA.reconstruct past geographyB.detect changes in mantle plumesC.measure the rigidity of tectonic platesD.explain why the seafloor spreads Paragraph 5 is marked with an arrow>Q10 What can be inferred about the Pacific Plate from paragraph 5?A.The hot spots on the Pacific Plate aremuch older than the ones located on the other tectonic plates.B.Most of the volcanic sources beneath thePacific Plate have become extinct.C.The Pacific Plate has moved a distanceequal to the length of the Hawaiian Island chain in the past 50 million years.D.The Pacific Plate is located above fewermantle plumes than other plates are. Paragraph 5 is marked with an arrow>Q11 The word “current”in the passage is closest in meaning toA.originalB.idealC.relative the interiors of plates are believed to be produced by mantle plumes, columns of molten rock that rise from deep within the mantle. A volcano remains an active”hot spot” as long as it is over the plume. The plumes apparently originate at great depths, perhaps as deep as the boundary between the core and the mantle, and many have been active for a very long time. The oldest volcanoes in the Hawaii hot-spot trail have ages close to 80 million years. Other islands, including Tahiti and Easter Islands in the Pacific, Reunion and Mauritius in the Indian Ocean, an indeed most of the large islands in the world’s oceans, owe their existence to mantle plumes.>The oceanic volcanic islands and their hot-spot trails are thus especially useful for geologists because they record the past locations of the plate over a fixed source. They therefore permit the reconstruction of the process of seafloor spreading, and consequently of the geography of continents and of ocean basins in the past. For example, given the current position of the Pacific Plate, Hawaii is above the Pacific Ocean hot spot. So the position of the Pacific Plate 50 million years ago can be determined by moving it such that a 50-million-year-old volcano in the hot-spot trail sits at the location of Hawaii today.However, because the ocean basins really are short-lived features on geologic time scales, reconstructing the world’s geography by backtracking along the hot-spot trail works only for the last 5 percent or so of geologic time.D.presentQ12 According to paragraph 5, why are geologists unable to trace back the entire geologic of continents from hot-spot trails? A.Hot spots have existed for only about5percent of geologic time.B.Hawaii did not exist 50 million years ago.C.Oceanic basins that contained old hot-spottrails disappeared a long time ago.D.Hot-spot trails can be reconstructed onlyfor island chainsParagraph 5 is marked with an arrow>Q13 Look at the four squares【■】that indicate where the following sentence could be added to the passage.This pattern remained unexplained for a long time.Where would the sentence best fit? Click on a square to add the sentence to the passage.Q14 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. Drag your answer choices to the spaces where they belong. To remove an answer choice, click on it. To review the passage, click VIEW NEXT.Although volcanic activity is concentrated on the edges of tectonic plates, such activity can occur in the interiors of plates as well.A.Our understanding of volcanic islandscomes from Daly’s and Wilson’s observations of the Hawaiian Islands, which was later confirmed by plate-tectonic theory.B.It has only recently been discovered thattectonic plates are closely fitting rather than loosely constructed, as geologists previously believed.C.The hot-spot trails formed by volcanicisland chains indicate the positions of tectonic plates as far back as the present ocean basins have existed.D.Volcanic island chains such as the HawaiianIslands form in the interior of a tectonic plate as the plate moves over a fixed volcanic source in the mantle.E.Whereas volcanic islands formed by mantleplumes are typically small, most of the world’s largest islands are formed at the edges of tectonic plates.F.The Pacific Plate has existed for as long as theHawaiian Islands have existed, namely for more than 80 million years.。
托福阅读tpo27R-2原文+译文+题目+答案+背景知识
托福阅读tpo27R-2原文+译文+题目+答案+背景知识原文 (1)译文 (4)题目 (6)答案 (16)背景知识 (17)原文The Formation of Volcanic Islands①Earth’s surface is not made up of a single sheet of rock that forms a crust but rather a number of “tectonic plates” that fit closely, like the pieces of a giant jigsaw puzzle. Some plates carry islands or continents, others form the seafloor. All are slowly moving because the plates float on a denser semi-liquid mantle, the layer between the crust and Earth’s core. The plates have edges that are spreading ridges (where two plates are moving apart and new seafloor is being created), subduction zones (where two plates collide and one plunges beneath the other), or transform faults (where two plates neither converge nor diverge but merely move past one another). It is at the boundaries between plates that most of Earth’s volcanism and earthquake activity occur.②Generally speaking, the interiors of plates are geologically uneventful. However, there are exceptions. A glance at a map of the Pacific Ocean reveals that there are many islands far out at sea that are actually volcanoes----many no longer active, some overgrown with coral----that originated from activity at points in the interior of the Pacific Plate that forms the Pacific seafloor.③How can volcanic activity occur so far from a plate boundary? The Hawaiian islands provide a very instructive answer. Like many other island groups, they form a chain. The Hawaiian Islands Chain extends northwest from the island of Hawaii. In the 1840s American geologist James Daly observed that the different Hawaii islands seem to share a similar geologic evolution but are progressively more eroded, and therefore probable older, toward the northwest. Then in 1963, in the early days of the development of the theory of plate tectonics. Canadian geophysicist Tuzo Wilson realized that this age progression could result if the islands were formed on a surface plate moving over a fixed volcanic source in the interior. Wilson suggested that the long chain of volcanoes stretching northwest from Hawaii is simply the surface expression of a long-lived volcanic source located beneath the tectonic plate in the mantle. Today’s most northwest island would have been the first to form. They as the plate moved slowly northwest, new volcanic islands would have forms as the plate moved over the volcanic source. The most recentisland, Hawaii, would be at the end of the chain and is now over the volcanic source.④Although this idea was not immediately accepted, the dating of lavas in the Hawaii (and other) chains showed that their ages increase away from the presently active volcano, just as Daly had suggested. Wilson’s analysis of these data is now a central part of plate tectonics. Most volcanoes that occur in the interiors of plates are believed to be produced by mantle plumes, columns of molten rock that rise from deep within the mantle. A volcano remains an active “hot spot” as long as it is over the plume. The plumes apparently originate at great depths, perhaps as deep as the boundary between the core and the mantle, and many have been active for a very long time. The oldest volcanoes in the Hawaii hot-spot trail have ages close to 80 million years. Other islands, including Tahiti and Easter Islands in the pacific, Reunion and Mauritius in the India Ocean, and indeed most of the large islands in the world’s oceans, owe their existence to mantle plumes.⑤The oceanic volcanic islands and their hot-spot trails are thus especially useful for geologist because they record the past locations of the plate over a fixed source. They therefore permit the reconstruction of the process of seafloor spreading, and consequently of the geography of continents and of ocean basins in the past. For example, given thecurrent position of the Pacific Plate, Hawaii is above the Pacific Ocean hot spot. So the position of The Pacific Plate 50 million years ago can be determined by moving it such that a 50-million-year-old volcano in the hot-spot trail sits at the location of Hawaii today. However because the ocean basins really are short-lived features on geologic times scale, reconstruction the world’s geography by backtracking along the hot-spot trail works only for the last 5 percent or so of geologic time.译文火山岛的形成①地球的外壳并不是由单块岩石形成的，而是许多的"构造板块"严密的组合在一起的，就像是一个巨大的拼图。
TPO27第二篇 (文章+问题)The Formation of Volcanic Islands
The Formation of Volcanic IslandsEarth’s surface is not made up of a single sheet of rock that forms a crust but rather a number of “tectonic plates” that fit closely, like the pieces of a giant jigsaw puzzle. Some plates carry islands or continents, others form the seafloor. All are slowly moving because the plates float on a denser semiliquid mantle, the layer between the crust and Earth’s core. The plates have edges that are spreading ridges (where two plates are moving apart and new seafloor is being created), subduction zones(where two plates collide and one plunges beneath the other),or transform faults(where two plates neither converge nor diverge but merely move past one another).It is at the boundaries between plates that most of Earth’s volcanism and earthquake activity oc cur.Generally speaking, the interiors of plates are geologically uneventful. However, there are exceptions. A glance at a map of the Pacific Ocean reveals that there are many islands far out at sea that are actually volcanoes—many no longer active, some overgrown with coral—that originated from activity at points in the interior of the Pacific Plate that forms the Pacific seafloor.How can volcanic activity occur so far from a plate boundary? The Hawaiian Islands provide a very instructive answer.■Like many other island groups, they from a chain. ■The Hawaiian Islands Chain extends northwest from the island of Hawaii. ■In the 1840s American geologist James Daly observed that the different Hawaii Islands seem to share a similar geologic evolution but are progressively more eroded, and therefore probably older, toward the northwest. ■Then in 1963, in the early days of the development of the theory of plate tectonics, Canadian geophysicist Tuzo Wilson realized that this age progression could result if the islands were formed on a surface plate moving over a fixed volcanic source in the interior. Wilson suggested that the long chain of volcanoes stretching northwest from Hawaii is simply the surface expression of a long-lived volcanic source located beneath the tectonic plate in the mantle. Today’s most northwest island would have been the first to form. Then, as the plate moved slowly northwest, new volcanic islands would have forms as the plate moved over the volcanic source. The most recent island, Hawaii, would be at the end of the chain and is now over the volcanic source.Although this idea was not immediately accepted, the dating of lavas in the Hawaii (and other) chains showed that their ages increase away from the presently active volcano, just as Daly had suggested. Wilson’s analysis of these data is now a central part of plate tectonics. Most volcanoes that occur in the interiors of plates are believed to be produced by mantle plumes, columns of molten rock that rise from deep within the mantle. A volc ano remains an active “hot spot” as long as it is over the plume. The plumes apparently originate at great depths, perhaps as deep as the boundary between the core and the mantle, and many have been active for a very long time. The oldest volcanoes in the Hawaii hot-spot trail have ages close to 80 million years. Other islands, including Tahiti and Easter Islands in the Pacific, Reunion and Mauritius in the Indian Ocean, an indeed most of the large islands in the world’s oceans, owe their existence to mantl e plumes.The oceanic volcanic islands and their hot-spot trails are thus especially useful for geologistsbecause they record the past locations of the plate over a fixed source. They therefore permit the reconstruction of the process of seafloor spreading, and consequently of the geography of continents and of ocean basins in the past. For example, given the current position of the Pacific Plate, Hawaii is above the Pacific Ocean hot spot. So the position of the Pacific Plate 50 million years ago can be determined by moving it such that a 50-million-year-old volcano in the hot-spot trail sits at the location of Hawaii today. However, because the ocean basins really are short-lived features on geologic times scales, reconstructing the world’s geography by backtracking along the hot-spot trail works only for the last 5 percent or so of geologic time.。
TPO-27阅读第三篇Predator=prey-cycles-答案详解
注意转折句子A new habitat , 本段主要讲的是predator 怎样影响prey 的数量，不是讲habitat.C.原文中没有比较D．未提，编造的A，逃脱 C。
幸存 D。
抵制 B。
恢复，重新多起来本段重点注意however 之后的叙述，之前说的就是实验室研究表明在实验室环境下，首先predator 吃完所有prey, 然后自己饿死，但是，注意后面however的叙述，说的真实情况下，是prey 减少，predator减少，随后Prey 又rebound的故事。
所以还是要往However 后面的内容上边来靠。
B。
原文未比较， C。
未提及实验的适应范围 D。
未提及一些predator 也是其他动物的prey.A.会影响的B.没有完全消失，只是减少C.是hare 的大概人口循环周期，不是所有小不如动物的，偷换了概念根据排除法只能选D，另外结合第二段的内容，说到在现实条件中安全环境的情况下发生的事情，故还是选D。
高频词汇，同时经常与More or less 连用。
Generate =produceGeneration after generationChange =vary=modify=alternate=fluctuate=transformSpeed up=accelerateSmooth out=vi.弄平(消除)A.对应第一句话c. 对应2-3句d.对应最后一句B．未说过最高级的问题，而且high fiber 是不得已的选择最后一句话as…so …说明问题，当Hare数量下降的时候，Lynx的数量就下降，因为它的食物减少了。
B.说反，因果倒置C.说反D.说反，是相关的本段的逻辑关系可以由下图表示Hare food increase +no predator=hare increase and no cycle 排除A CCycle1=food 不变+no predatorCycle 2= food 增加+ 引入predator从而得出B是对的D没有说过hide 这个动词本段结构图可以如下画1.no predator ---one species dominate and exclude other species2.predator ===competitor controlled , some other species survived 证明A正确example,1.sea star---Bm---other organism can survive B 选项与此部分相反2. no sea star diversity decrease –one species will beeliminatedC 选项与此部分相反 D。
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The Formation of Volcanic Islands
Paragraph 2
Generally speaking, the interiors of plates are geologically uneventful. However, there are exceptions. A glance at a map of the Pacific Ocean reveals that there are many islands far out at sea that are actually volcanoes—many no longer active, some overgrown with coral—that originated from activity at points in the interior of the Pacific Plate that forms the Pacific seafloor.
Q3 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.V olcanic activity is responsible for the formation of the Pacific seafloor in the
interior of the Pacific Plate.
B.Many volcanoes in the Pacific Ocean are no longer active and have become
islands that support coral.
C.There are many islands in the Pacific Ocean that originated as volcanoes in the
interior of the Pacific Plate.
D.The map of the Pacific Ocean reveals fewer volcanic islands than there truly are
because many are no longer active and some are completely overgrown with coral.
确定句子核心信息
A glance at a map of the Pacific Ocean reveals that there are many islands far out at sea that are actually volcanoes—many no longer active, some overgrown with coral—that originated from activity at points in the interior of the Pacific Plate that forms the Pacific seafloor.
分析：通过确定核心信息，我们看到该句最基本的结构是主语（A glance）+谓语动词（reveals）+宾语从句（that…）。
该句的难点在于宾语从句里有两个定语从句的嵌套，在句中已用蓝色标出，第一个定语从句是对many islands进行限定修饰；第二个定语从句是对volcanoes进行限定修饰，而破折号中间的成分则是对volcanoes这个信息的补充说明，与句子核心信息关系不大，可忽略不看。
理解大意
中文翻译：看一眼太平洋的地图就能发现在远离海岸的海洋里有许多其实是火山的岛屿，这些火山起源于形成太平洋海床的太平洋板块内部一些点的活动。
核对选项
A.V olcanic activity is responsible for the formation of the Pacific seafloor in the
interior of the Pacific Plate.
A选项句子主语是火山活动，而原句讲的是岛屿，核心信息缺失。
B.Many volcanoes in the Pacific Ocean are no longer active and have become
islands that support coral.
B选项句子主语是火山，且后面有信息no longer active不再活跃，这是原句完全没有出现的信息。
C.There are many islands in the Pacific Ocean that originated as volcanoes in the
interior of the Pacific Plate.
C选项大意为：太平洋里有许多岛屿，这些岛屿起源于太平洋板块内部的火山。
与原句意思最贴切。
D.The map of the Pacific Ocean reveals fewer volcanic islands than there truly are
because many are no longer active and some are completely overgrown with coral.
D选项中有比较结构fewer…than…，这在原句中也是完全没有出现的。
故正确答案选择C。
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