18年托福阅读真题附答案
2018年5月26日托福阅读真题解析
2018年5月26日托福阅读真题解析2018年5月26日的托福阅读考试终于结束了，同学们是不是非常的兴奋，是不是想了解自己考得怎么样呢？下面就和店铺一起来看看2018年5月26日托福阅读真题解析。
Passage One学科分类：社会题目：Two forces of urban growth内容回忆：首段：首先说城市增长有很多原因，比如经济增长、交通发展、科技进步。
然后除了这些之外引入了两个概念：centrifugal（分散化）和centripetal（中心化）。
（分类讨论）然后介绍manufact uring的发展对于城镇发展的促进作用：蒸汽机解放了产业对于流水的依赖性，早期的制造商人把工厂建造在城镇中心，主要有两个原因：1、城镇有丰富的劳动力，可以解决工厂劳动力来源；2、当时基本交通方式是以步行为主，所以要把工厂建立在人们步行可以达到的地方，这种布置促进了城镇中心化发展。
（第一题是个时间取反的推理题，问蒸汽机发明前制造业怎么样。
）第二段：虽然制造业对于商业发展有促进作用，但是随着社会的进步，经济的发展，零售业和其他行业的发展也集聚在城市中心，这使得城市的地价进一步提升，对于制造业来说成本就越来越高，加上铁路等运输方式的发展，制造业可以分布在城市郊区，这样降低成本，同时只需要修建较短的运输方式就可以和城市中心相连，所以城市开始扩张，制造业分布在市郊。
第三段：对于零售业的发展，零售业必须建在有大量居民的地区，同时因为可以在商店内陈列大量商品，所以零售业的利润一直都很高。
同时混凝建筑的发展、电梯的使用，促进了零售业的垂直分布，可以容纳不断扩张的产品和工作人员。
（出了一个句子简化题）第四段：交通运输业的发展促进了销售和产品生产的分离，人们可以无需面对面沟通，通过电话、电报沟通即可，进一步促进了城市的扩张。
Commercial office可以在市中心，接近人群和各种服务，同时也可以控制生产中心。
词汇题：Respectively=particularlySufficient=enoughProximity=in short distancesThus=in this wayPassage Two学科分类：动物学题目：Storage strategies of squirrels内容回忆：首段：有很多动物有储藏策略，但是松鼠的储藏手段在所有动物中尤其突出。
托福阅读TPO18（试题+答案+...
托福阅读TPO18(试题+答案+译文)第1篇:IndustrializationintheNetherlandsandS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托福阅读TPO18(试题+答案+译文)第1篇:Industrialization in the Netherlands and Scandinavia，希望大家喜欢!托福阅读TPO18原文第1篇While some European countries, such as England and Germany, began to industrialize in the eighteenth century, the Netherlands and the Scandinavian countries of Denmark, Norway, and Sweden developed later. All four of these countries lagged considerably behind in the early nineteenth century. However, they industrialized rapidly in the second half of the century, especially in the last two or three decades. In view of their later start and their lack of coal—undoubtedly the main reason they were not among the early industrializers—it is important to understand the sources of their success.All had small populations. At the beginning of the nineteenth century, Denmark and Norway had fewer than 1 million people, while Sweden and the Netherlands had fewer than 2.5 million inhabitants. All exhibited moderate growth rates in the course of the century (Denmark the highest and Sweden the lowest), but all more than doubled in population by 1900. Density varied greatly. The Netherlands had one of the highest population densities in Europe, whereas Norway and Sweden had the lowest Denmark was in between but closer to the Netherlands.Considering human capital as a characteristic of the population, however, all four countries were advantaged by the large percentages of their populations who could read and write. In both 1850 and 1914, the Scandinavian countries had thehighest literacy rates in Europe, or in the world, and the Netherlands was well above the European average. This fact was of enormous value in helping the national economies find their niches in the evolving currents of the international economy.Location was an important factor for all four countries. All had immediate access to the sea, and this had important implications for a significant international resource, fish, as well as for cheap transport, merchant marines, and the shipbuilding industry. Each took advantage of these opportunities in its own way. The people of the Netherlands, with a long tradition of fisheries and mercantile shipping, had difficulty in developing good harbors suitable for steamships: eventually they did so at Rotterdam and Amsterdam, with exceptional results for transit trade with Germany and central Europe and for the processing of overseas foodstuffs and raw materials (sugar, tobacco, chocolate, grain, and eventually oil). Denmark also had an admirable commercial history, particularly with respect to traffic through the Sound (the strait separating Denmark and Sweden). In 1857, in return for a payment of 63 million kronor from other commercial nations, Denmark abolished the Sound toll dues the fees it had collected since 1497 for the use of the Sound. This, along with other policy shifts toward free trade, resulted in a significant increase in traffic through the Sound and in the port of Copenhagen.The political institutions of the four countries posed no significant barriers to industrialization or economic growth. The nineteenth century passed relatively peacefully for these countries, with progressive democratization taking place in all of them. They were reasonably well governed, without notable corruption or grandiose state projects, although in all of themthe government gave some aid to railways, and in Sweden the state built the main lines. As small countries dependent on foreign markets, they followed a liberal trade policy in the main, though a protectionist movement developed in Sweden. In Denmark and Sweden agricultural reforms took place gradually from the late eighteenth century through the first half of the nineteenth, resulting in a new class of peasant landowners with a definite market orientation.The key factor in the success of these countries (along with high literacy, which contributed to it) was their ability to adapt to the international division of labor determined by the early industrializers and to stake out areas of specialization in international markets for which they were especially well suited. This meant a great dependence on international commerce, which had notorious fluctuations; but it also meant high returns to those factors of production that were fortunate enough to be well placed in times of prosperity. In Sweden exports accounted for 18 percent of the national income in 1870, and in 1913, 22 percent of a much larger national income. In the early twentieth century, Denmark exported 63 percent of its agricultural production: butter, pork products, and eggs. It exported 80 percent of its butter, almost all to Great Britain, where it accounted for 40 percent of British butter imports.托福阅读TPO18试题第1篇1.Paragraph 1 supports which of the following ideas about England and Germany?A.They were completely industrialized by the start of the nineteenth century.B.They possessed plentiful supplies of coal.C.They were overtaken economically by the Netherlands andScandinavia during the early nineteenth century.D.They succeeded for the same reasons that the Netherlands and Scandinavia did.2.Paragraph 2 suggests which of the following about the importance of population density in the industrialization of the Netherlands and Scandinavia?A.It was a more important factor than population size.B.It was more influential than the rate of population growth.C.It was more important in the early stages than it was later.D.It was not a significant factor.3.According to paragraphs 2 and 3, which of the following contributed significantly to the successful economic development of the Netherlands and of Scandinavia?A.The relatively small size of their populationsB.The rapid rate at which their populations were growingC.The large amount of capital they had available for investmentD.The high proportion of their citizens who were educated4.According to paragraph 4, because of their location, the Netherlands and the Scandinavian countries had all of the following advantages when they began to industrialize EXCEPTA.low-cost transportation of goodsB.access to fishC.shipbuilding industriesitary control of the sea5.The word “exceptional”in passage 4 is closest in meaning toA.extraordinaryB.surprisingC.immediateD.predictable6.The word “abolished” in passage 4 is closest in meaning toA.endedB.raisedC.returnedD.lowered7.According to paragraph 5, each of the following contributed positively to the industrialization of the Netherlands and Scandinavia EXCEPTA.generally liberal trade policiesB.huge projects undertaken by the stateC.relatively uncorrupt governmentsD.relatively little social or political disruption8.The word “progressive”in passage 5 is closest in meaning toA.rapidB.partialC.increasingD.individual9.The author includes the information that “a protectionist movement developed in Sweden”(in paragraph 5) in order toA.support the claim that the political institutions of the four countries posed no significant barriers to industrialization or economic growthB.identify an exception to the general trend favoring liberal trade policyC.explain why Sweden industrialized less quickly than the other Scandinavian countries and NetherlandsD.provide evidence that agricultural reforms take place morequickly in countries that have a liberal trade policy than in those that do not10.Which of the sentences below best expresses the essential information in the highlighted sentence in passage 6? Incorrect choices change the meaning in important ways or leave out essential information.A.The early industrializes controlled most of the international economy, leaving these countries to stake out new areas of specialization along the margins.B.Aided by their high literacy rates these countries were able to claim key areas of specialization within established international markets.C.High literacy rates enabled these countries to take over international markets and adapt the international division of labor to suit their strengths.D.The international division of labor established by the early industrializers was suited to these countries, a key factor in their success.11.According to paragraph 6, a major problem with depending heavily on international markets was that theycked stabilityB.were not well suited to agricultural productsC.were largely controlled by the early industrializersD.led to slower growth of local industries12.According to paragraph 6, what advantage could a country gain from being heavily involved in international commerce?A.A steadily rising national incomeB.Greater control over market fluctuationsC.High returns when things went wellD.A reduced need for imports13. Look at the four squares [■] that indicate where the following sentence be added to passage. Where would the sentence best fit? During this period, Sweden had the highest rate of growth of output per capita of any country in Europe, and Denmark was secondWhile some European countries, such as England and Germany, began to industrialize in the eighteenth century, the Netherlands and the Scandinavian countries of Denmark, Norway, and Sweden developed later. ■【A】 All four of these countries lagged considerably behind in the early nineteenth century. ■【B】However, they industrialized rapidly in the second half of the century, especially in the last two or three decades. ■【C】 In view of their later start and their lack of coal—undoubtedly the main reason they were not among the early industrializers—it is important to understand the sources of their success. ■【D】14. Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THERR answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points.Although the Netherlands and Scandinavia began to industrialize relatively late, they did so very successfullyA.Although these countries all started with small, uneducated populations, industrialization led to significant population growth and higher literacy rates.B.Thanks to their ready access to the sea, these countriesenjoyed advantages in mercantile shipping, fishing, and shipbuilding.C.Because they all started with good harbors for steamships, these countries started with an important advantage in the competition for transit trade.D.These countries were helped by the fact that their governments were relatively stable and honest and generally supported liberal trade policies.E.These countries were successful primarily because their high literacy rates helped them fill specialized market niches.F.Because they were never fully dependent on international commerce, these countries were able to survive notorious fluctuations in international markets.托福阅读TPO18答案第1篇1.注意这道题没有明显关键词，England和Germany是不能用的，因为跟主题相关，所以用排除法。
2018年3月托福真题回忆及解析
2018年3月托福真题回忆及解析水滴石穿，绳锯木断。
备考需要一点点积累才能到达好的效果。
无忧考网搜集整理了2018年3月托福真题回忆及解析，通过做题，能够巩固所学知识并灵活运用，考试时会更得心应手。
2018年3月举行了5场考试，考试时间分别为3月3日、3月10日、3月11日、3月24日、3月31日，以下内容仅供参考。
3月3日托福口语真题回忆：Task 1内容回忆：你是学校学生，学校报纸要增加栏目，给学生带来方便，选增加哪个推荐：local restaurant review，film，travel参考答案：If a section is going to be added in campus newspaper, I will recommend local restaurant review. Apparently, students will not only eat on campus. They also have interests to explore local restaurants. This new section canprovide a reference for them, and students can choose where to eat based on those descriptions and comments, which will bring a lot of convenience. What’s more, Ithink this can also strengthen the connection between local communities and students. Those restaurants can take advantage of this section to advertise and attract more students to visit them. They can modify their food or provide special meals for students, which will benefit both themselves and students.Task 2内容回忆：学校是否应该进行道德教育(moral values)参考答案：Of course school should give students education on moral values.The word “education” not only refers to academic content teaching but also includes helping students become kind and straight people. You may have heard stories about high intelligent criminals, and we don’t want our children become people like that. So it is necessary that school should teach children what’s right and what’s wrong. Besides, although parents may play an important role on teaching their kids moral values, schools also have obligations. Those parents have various identities or backgrounds and they may pay attention on different aspects of children’s growth, which will cause some bias. Only school can provide children a systematic education on moral values.Task 3阅读通知：学校要取消人少的 club原因 1：为了省钱原因 2：对社交没用听力态度：女生不同意原因 1. 不能省钱：学校本身给 club 花的钱就很少;原因 2. 人少的 club 更好：成员间的关系会更好Task 4 生物阅读 holiday paradox：人们对周围环境熟悉，感觉时间就过得慢;不熟悉就过得快。
2018年11月托福真题回忆及解析
2018年11月托福真题回忆及解析不积跬步，无以至千里；不积小流，无以成江海。
对于托福考试而言，每天进步一点点，基础扎实一点点，通过考试就会更容易一点点。
无忧考网搜集整理了2018年11月托福真题回忆及解析，希望对大家有所帮助。
2018年11月举行了6场考试，时间分别是11月4日、11月10日、11月11日、11月17日、11月24日、11月25日。
以下内容仅供参考。
11月4日托福口语真题回忆：Task 1大学从毕业校友获得一笔钱，应该用于哪个活动：1、screen movie2、outdoor music concert3、video gamesTask 2Do you agree that it is easier to be an adult than a child?Task 3变化：murals show on the wall of the stairs , an opportunity for artstudents to display their works。
1、地方很好，因为过往人多，有更多人能欣赏他们的作品；2、时间很好，那个时候没什么课，人少，交通不拥挤。
男生：支持理由 1：地方很好，因为过往人多，有更多人能欣赏他们的作品；理由 2：、时间很好，那个时候没什么课，人少，交通不拥挤。
Task 4术语：pseudoscience 伪科学解释：一些公司利用伪科学来给产品打广告，用一些看似科学的外表欺骗消费者，让他们相信这些产品对他们很有用。
听力里面教授举例说电子产品公司请一些所谓的专家来设计游戏，用一些小研究来证明产品有用，所以消费者相信这些游戏能帮助他们变聪明，思考更快，就会花钱买。
但是心理学家证明这种东西没有有力的证据，这些研究不可靠。
Task 5问题：时间冲突了，约好了周三去跟朋友讨论葡萄牙语的一本书，同时健身馆的工作因为一个员工辞职了，调整了她的上班时间，周三有班。
解决方法 1：下班后晚上 11 点再去更朋友汇合。
2018年6月托福真题回忆及解析
2018年6月托福真题回忆及解析所有的成功都来自于行动，只有付诸行动，才能一步步走向成功。
无忧考网搜集整理了2018年6月托福真题回忆及解析，希望对大家有所帮助。
2018年6月举行了4场考试，时间分别为6月2日、6月10日、6月23日、6月30日。
以下内容仅供参考。
6月2日托福口语真题回忆：Task 1学校要舍弃报纸用在线刊物代替，提出优点/一个缺点Task2你更喜欢教师何时回答学生问题，讲完课之后还是讲课期间，为什么Task3学校 announcement：下届新生改变夏季的安排，让时间安排更自由活动更多。
女生很同意，一个是觉得大家暑假都很忙档期很满，一个是觉得活动多了好，会更有意思，也能在活动过程中找到朋友。
Task4人对自己学过的东西就会觉得它出现的频率变高了。
教授举了自己的亲身例子：他辅导女儿写的 paper 的主题在一个纪录片也看到过，然后有一次他跟她女儿出去吃饭看到一个海报贴了这个。
他问他女儿这是第一次贴吗，他女儿说这个海报贴了很久了。
印证了人们会对自己学过的知识 pay more attention，所以感觉出现的频率变高了。
Task5男生吃饭的时候番茄酱蹭衬衫上了，然后他脱掉换成运动装，但是下午有很重要的演讲要出席，女生建议他回家换衣服，他怕耽误他本来用来准备会议的时间。
Task6浮游生物对海洋动物的好处，travel long distance 和躲避 predator6月2日托福听力真题回忆：Conversation1.学生网上申请借书，但过了一周都没收到邮件，职员说 2 楼的中世纪历史书被淹了，一大堆要借书，图书馆忙不过来，然后给了学生建议2.学生问教授 iceberg 能不能用到自己的作业上，教授说行，这个材料环境友好3.学生借多媒体教室教课:女学生去问男宿管借用 multifunction room 的条件。
宿管说这个房间是之前被废弃不用，现在给教师职工用的。
学生解释她要用来上课，这是她的一个project，可以给自己加学分的，而且已经有六个人表示愿意参加她的课程了。
2018年4月21日托福阅读真题回忆
Passage One学科分类：农业题目：The Farming and Pastorium in Africa内容回忆：第一段，之前人们主要靠hunting和gathering维生，stone age开始人们开始planting， domesticating animals第二段，在农业方面，人们最开始只是去保护一些野生植物，只有当人们开始种植一些适应能力强的植物，真正的种植才开始。
畜养动物也是一样，人们最开始保护一些野生动物，后来开始真正驯养第三段，种植使得人们的生活更加稳定，种植后的作物也可以提供额外的食物，可以供养孩子，另外孩子多劳动力也就多了第四段，生活稳定后，人们就会建造更多固定的住所，比如会造石屋。
这使得工具种类越来越多，也衍生出来一些不参与到农业中的职业，比如牧师。
另外人们还制造出来各种pottery，对目前的考古学相当重要第五段，农业的改变产生了比较重大的社会影响。
社群中人们需要更好的合作协调第六段，农业发展也带来的不好的方面，使得贫富差距更加大，那些控制生产的人更加富有第七段，农业发展不仅对农业有好处，对于herding也有好处。
牛可以产牛奶，自然灾害时还可以作为肉吃，而且迁徙过程中，动物还可以carry things around词汇题：1. implication = consequently2. perpetually = constantly3. suitably = adequately4. remnant = remainPassage Two学科分类：工业题目：The Industrial Revolution in Britain内容回忆：第一段，一系列的原因导致了工业革命在英国发生第二段，英国具有非常好的地理位置，周围都是海洋，可以避免侵略，所以用在army上的投入较少，但是英国非常重视navy，强大的navy在战争时可以维护和平，在和平时期可以用作贸易第三段，英国不仅海洋对于工业革命很重要，它也有比较好的内部河运系统。
2018年托福阅读练习题及答案(2篇)
2018年托福阅读练习题及答案（2篇）托福阅读考试介绍：托福考试满分为120分，分为4部分，考试顺序为：阅读→听力→口语→写作。
托福阅读考试时间：1个小时(遇加试时，时间为1个小时40分钟)。
阅读部分包括3篇文章，每篇650至750个单词，每篇对应11至13道试题。
题目类型包括：图表题，篇章总结题(从给出的选项中选择能够概括文章内容的句子)，变换措辞题，词汇题(在一定的上下文中)，指代关系题，简化句子题，插入文本题，事实信息题，推断题，修辞目的题以及否定排除题(例如，下列各项均正确除……之外)。
在完成答题的过程中，考生可以使用“复查”功能瞬间找出没有回答的题目，而不必每道题都过一遍。
PASSAGE 1By the mid-nineteenth century, the term icebox had entered the American language, but icewas still only beginning to affect the diet of ordinary citizens in the United States. The ice tradegrew with the growth of cities. Ice was used in hotels, taverns, and hospitals, and by someforward-looking city dealers in fresh meat, fresh fish, and butter. After the Civil War (1861-1865),as ice was used to refrigerate freight cars, it also came into household use. Even before 1880, halfthe ice sold in New York, Philadelphia, andBaltimore, and one-third of that sold in Boston andChicago, went to families for their own use. This had become possible because a new householdconvenience, the icebox, a precursor of the modern refrigerator, had been invented.Making an efficient icebox was not as easy as we might now suppose. In the early nineteenthcentury, the knowledge of the physics of heat, which was essential to a science of refrigeration,was rudimentary. The commonsense notion that the best icebox was one that prevented the icefrom melting was of course mistaken, for it was the melting of the ice that performed the cooling.Nevertheless, early efforts to economize ice included wrapping the ice in blankets, which kept theice from doing its job. Not until near the end of the nineteenth century did inventors achieve thedelicate balance of insulation and circulation needed for an efficient icebox.But as early as 1803, an ingenious Maryland farmer, Thomas Moore, had been on the righttrack. He owned a farm about twenty miles outside the city of Washington, for which th e villageof Georgetown was the market center. When he used an icebox of his own design to transport hisbutter to market, he found that customers would pass up the rapidly melting stuff inthe tubs ofhis competitors to pay a premium price for his butter, still fresh and hard in neat, one-poundbricks. One advantage of his icebox, Moore explained, was that farmers would no longer have totravel to market at night in order to keep their produce cool.1. What does the passage mainly discuss?(A) The influence of ice on the diet(B) The development of refrigeration(C) The transportation of goods to market(D) Sources of ice in the nineteenth century2. According to the passage , when did the word icebox become part of the language of the United States?(A) in 1803(B) sometime before 1850(C) during the civil war(D) near the end of the nineteenth century3. The phrase forward-looking in line 4 is closest in meaning to(A) progressive(B) popular(C) thrifty(D) well-established4. The author mentions fish in line 4 because(A) many fish dealers also sold ice(B) fish was shipped in refrigerated freight cars(C) fish dealers were among the early commercial users of ice(D) fish was not part of the ordinary person's diet before the invention of the icebox5. The word it in line 5 refers to(A) fresh meat(B) the Civil War(C) ice(D) a refrigerator6. According to the passage , which of the following was an obstacle to the development of the icebox?(A) Competition among the owners of refrigerated freight cars(B) The lack of a network for the distribution of ice(C) The use of insufficient insulation(D) Inadequate understanding of physics7. The word rudimentary in line 12 is closest in meaning to(A) growing(B) undeveloped(C) necessary(D) uninteresting8. According to the information in the second paragraph, an ideal icebox would(A) completely prevent ice from melting(B) stop air from circulating(C) allow ice to melt slowly(D) use blankets to conserve ice9. The author describes Thomas Moore as having been on the right track (lines 18-19) to indicate that(A) the road to the market passed close to Moore's farm(B) Moore was an honest merchant(C) Moore was a prosperous farmer(D) Moore's design was fairly successful10. According to the passage , Moore's icebox allowed him to(A) charge more for his butter(B) travel to market at night(C) manufacture butter more quickly(D) produce ice all year round11. The produce mentioned in line 25 could include(A) iceboxes(B) butter(C) ice(D) marketsAnswers:BBACC DBCDA BPASSAGE 2The geology of the Earth's surface is dominated by the particular properties of water. Presenton Earth in solid, liquid, and gaseous states, water is exceptionally reactive. It dissolves,transports, and precipitates many chemical compounds and is constantly modifying the face ofthe Earth.Evaporated from the oceans, water vapor forms clouds, some of which are transported bywind over the continents. Condensation from the clouds provides the essential agent ofcontinental erosion: rain. Precipitated onto the ground, the water trickles down to form brooks,streams, and rivers, constituting what are called the hydrographic network. This immensepolarized network channels the water toward a single receptacle: an ocean. Gravity dominatesthis entire step in the cycle because watertends to minimize its potential energy by running fromhigh altitudes toward the reference point, that is, sea level.The rate at which a molecule of water passes though the cycle is not random but is a measureof the relative size of the various reservoirs. If we define residence time as the average time for awater molecule to pass through one of the three reservoirs —atmosphere, continent, and ocean—we see that the times are very different. A water molecule stays, on average, eleven days inthe atmosphere, one hundred years on a continent and forty thousand years in the ocean. Thislast figure shows the importance of the ocean as the principal reservoir of the hydrosphere butalso the rapidity of water transport on the continents.A vast chemical separation process takes places during the flow of water over the continents.Soluble ions such as calcium, sodium, potassium, and some magnesium are dissolved andtransported. Insoluble ions such as aluminum, iron, and silicon stay where they are and form thethin, fertile skin of soil on which vegetation can grow. Sometimes soils are destroyed andtransported mechanically during flooding. The erosion of the continents thus results from twoclosely linked andinterdependent processes, chemical erosion and mechanical erosion. Theirrespective interactions and efficiency depend on different factors.1. The word modifying in line 4 is closest in meaning to(A) changing(B) traveling(C) describing(D) destroying2. The word which in line 5 refers to(A) clouds(B) oceans(C) continents(D) compounds3. According to the passage , clouds are primarily formed by water(A) precipitating onto the ground(B) changing from a solid to a liquid state(C) evaporating from the oceans(D) being carried by wind4. The passage suggests that the purpose of the hydrographic network (line 8) is to(A) determine the size of molecules of water(B) prevent soil erosion caused by flooding(C) move water from the Earth's surface to the oceans(D) regulate the rate of water flow from streams and rivers5. What determines the rate at which a molecule of water moves through the cycle, as discussed in the third paragraph?(A) The potential energy contained in water(B) The effects of atmospheric pressure on chemical compounds(C) The amounts of rainfall that fall on the continents(D) The relative size of the water storage areas6. The word rapidity in line 19 is closest in meaning to(A) significance(B) method(C) swiftness(D) reliability7. The word they in line 24 refers to(A) insoluble ions(B) soluble ions(C) soils(D) continents8. All of the following are example of soluble ions EXCEPT(A) magnesium(B) iron(C) potassium(D) calcium9. The word efficiency in line 27 is closest in meaning to(A) relationship(B) growth(C) influence(D) effectivenessAnswers:AACCD CABD。
托福TPO18阅读Passage2原文文本+题目+答案解析
¡¡¡¡ÎªÁË°ïÖú´ó¼Ò¸ßЧ±¸¿¼Íи££¬Îª´ó¼Ò´øÀ´Íи£TPO18ÔĶÁPassage2Ô-ÎÄÎı¾+ÌâÄ¿+´ð°¸½âÎö£¬Ï£Íû¶Ô´ó¼Ò±¸¿¼ÓÐËù°ïÖú¡£¡¡¡¡¨ Íи£TPO18ÔĶÁPassage2Ô-ÎÄÎı¾£º¡¡¡¡The mystery of yawning¡¡¡¡According to conventional theory, yawning takes place when people are bored or sleepy and serves the function of increasing alertness by reversing, through deeper breathing, the drop in blood oxygen levels that are caused by the shallow breathing that accompanies lack of sleep or boredom. Unfortunately, the few scientific investigations of yawning have failed to find any connection between how often someone yawns and how much sleep they have had or how tired they are. About the closest any research has come to supporting the tiredness theory is to confirm that adults yawn more often on weekdays than at weekends, and that school children yawn more frequently in their first year at primary school than they do in kindergarten.¡¡¡¡Another flaw of the tiredness theory is that yawning does not raise alertness or physiological activity, as the theory would predict. When researchers measured the heart rate, muscle tension and skin conductance of people before, during and after yawning, they did detect some changes in skin conductance following yawning, indicating a slight increase in physiological activity. However, similar changes occurred when the subjects were asked simply to open their mouths or to breathe deeply. Yawning did nothing special to their state of physiological activity. Experiments have also cast serious doubt on the belief that yawning is triggered by a drop in blood oxygen or a rise in blood carbon dioxide. Volunteers were told to think about yawning while they breathed either normal air, pure oxygen, or an air mixture with an above-normal level of carbon dioxide. If the theory was correct, breathing air with extra carbon dioxide should have triggered yawning, while breathing pure oxygen should have suppressed yawning. In fact, neither condition made any difference to the frequency of yawning, which remained constant at about 24 yawns per hour. Another experiment demonstrated that physical exercise, which was sufficiently vigorous to double the rate of breathing, had no effect on the frequency of yawning. Again the implication is that yawning has little or nothing to do with oxygen.¡¡¡¡A completely different theory holds that yawning assists in the physical development of the lungs early in life, but has no remaining biological function in adults. It has been suggested that yawning and hiccupping might serve to clear out the fetuses airways. The lungs of a fetus secrete a liquid that mixes with its mother's amniotic fluid. Babies with congenital blockages that prevent this fluid from escaping from their lungs are sometimes born with deformed lungs. It might be that yawning helps to clear out the lungs by periodically lowering the pressure in them. According to this theory, yawning in adults is just a developmental fossil with no biological function. But, while accepting that not everything in life can be explained byDarwinian evolution, there are sound reasons for being skeptical of theories like this one, which avoid the issue of what yawning does for adults. Yawning is distracting, consumes energy and takes time. It is almost certainly doing something significant in adults as well as in fetuses. What could it be?¡¡¡¡The empirical evidence, such as it is, suggests an altogether different function for yawning¡ªnamely, that yawning prepares us for a change in activity level. Support for this theory came from a study of yawning behavior in everyday life. Volunteers wore wrist-mounted devices that automatically recorded their physical activity for up to two weeks: the volunteers also recorded their yawns by pressing a button on the device each time they yawned. The data showed that yawning tended to occur about 15 minutes before a period of increased behavioral activity. Yawning bore no relationship to sleep patterns, however. This accords with anecdotal evidence that people often yawn in situations where they are neither tired nor bored, but are preparing for impending mental and physical activity. Such yawning is often referred to as "incongruous" because it seems out of place, at least on the tiredness view: soldiers yawning before combat, musicians yawning before performing, and athletes yawning before competing. Their yawning seems to have nothing to do with sleepiness or boredom¡ªquite the reverse¡ªbut it does precede a change in activity level.¡¡¡¡Paragraph 1£º According to conventional theory, yawning takes place when people are bored or sleepy and serves the function of increasing alertness by reversing, through deeper breathing, the drop in blood oxygen levels that are caused by the shallow breathing that accompanies lack of sleep or boredom. Unfortunately, the few scientific investigations of yawning have failed to find any connection between how often someone yawns and how much sleep they have had or how tired they are. About the closest any research has come to supporting the tiredness theory is to confirm that adults yawn more often on weekdays than at weekends, and that school children yawn more frequently in their first year at primary school than they do in kindergarten.¡¡¡¡¨ Íи£TPO18ÔĶÁPassage2ÌâÄ¿£º¡¡¡¡1. 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.¡¡¡¡? It is the conventional theory that when people are bored or sleepy, they often experience a drop in blood oxygen levels due to their shallow breathing.¡¡¡¡? The conventional theory is that people yawn when bored or sleepy because yawning raises blood oxygen levels, which in turn raises alertness.¡¡¡¡? According to conventional theory, yawning is more likely to occur when people are bored or sleepy than when they are alert and breathing deeply.。
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The Extinction of the Dinosaursmillion years ago) and the Paleocene period (65..C55 million years ago) in part by the types and amounts of rocks and fossils they contain or lack. Before the limit of 65 million years ago，marine2.strata are rich in calcium carbonate due to accumulations of fossils of microscopic algaedeposited on the sea floor. Above the 65-million-year limit，sea-floor sediments contain much less calcium carbonate ，and fossils of several families of mollusks are no longer found.In continental sediments ，dinosaur fossils ，though frequent before 65 million years ago ，are totally absent. By3.contrast，new families of mammals appear，including large mammals for the first time.Scientists wondered for many years about what could have caused the dinosaurs' rapiddisappearance at the end of the Cretaceous period，coming up with a great variety of theories and scenarios. For some, it could have been due to unfavorable genetic changes triggered bya dramatic increaseby a factor of 10，100，1，000 in cosmic-ray particles reaching the Earthafter a supernova explosion somewhere in the neighborhood of the solar system. For these high-energy particles to affect life，they would have to get through the protective barrier of the Earth's magnetosphere ，the region of the upper atmosphere controlled by Earth'smagnetic field. That could have happened if the cloud of particles from the supernovaexplosion reached the Earth during a period when the magnetosphere was weakened ，something that may happen when the Earth's magnetic field changes direction. And we know that the magnetic north and south poles of the Earth switch on the average twice everymillion years. However，this is not the only possible explanation for dinosaur destruction . 4.Other theories have raised the possibility of strong climate changes in the tropics (but theythen must be explained) . Certainly，if climate changes，the changed distributions oftemperature and rainfall modify the conditions that favor one ecosystem over another. The extinction of a particular family，genus，or species may result from a complicated chain of indirect causes and effects. Over thirty years ago ，scientist Carl Sagan quoted onesuggestion that the demise of the dinosaurs resulted from the disappearance of a species of fern plant that was important for dinosaur digestion. Other theories involved a worldwidecold wave following the spread of a layer of cold but not very salty water in the world'soceans ，which floated on the surface because，with its low salinity，the water was less dense.5.Proponents of another theory that remains under consideration today postulate that theextinction of the dinosaurs corresponds to a period of intense volcanic activity. It's not a question of just one or even of a thousand eruptions comparable to the explosion of Krakatoa in 1883，one of the largest volcanic events in modern times ，but rather of a prolonged period of activity. On the Deccan plateau in India，basalt (volcanic) rocks cover more than 500，000 square kilometers (nearly 200，000 square miles)，and correspond to massive lava outflows occurring precisely at the end of the Cretaceous. This sort of outflow could correspond tovolcanic activity similar to the activity that drives sea-floor spreading ，with lava emerging from elongated fractures in the crust rather than from craters.6.The volcanic convulsion that buried the Deccan plateau in lava must also have changed thecomposition of the atmosphere and severely affected climate. Initially，there must have been strong sudden cooling resulting from the blocking of sunlight by sulfate aerosol veils in thestratosphere (part of the Earth's atmosphere). If strong cooling lasted a year after the formation of the aerosols ， it would have been the death of tropical species unable to adapt to such a volcanic winter. 7. However ，a long period of strong volcanic activity (again ，remember thousands of Krakatoas) would at the same time have added a substantial amount of carbon dioxide to the atmosphere ， reinforcing the greenhouse effect. This would gradually warm things up ，ending the extended cold snap and producing global warming together with geographic shifts of humid and arid (dry) zones. Certainly things would change to upset living conditions ，leading to the extinction of some species while others would profit ，if only from the disappearance of predators. 1..According to paragraph 1，which of the following is true of Paleocene sediments A. They lack fossils from some families of mammals found in Cretaceous sediments. B. They contain fossils of dinosaurs. C. They contain fossils of some animals that did not exist during the Cretaceous. D. They contain fossils of more kinds of mollusks than are found in Cretaceous sediments. 2..The word unfavorable in the passage is closest in meaning to A. Unusual B. Disadvantageous C. Sudden D. major 3..The word triggered in the passage is closest in meaning to A. initiated B. intensifie C. followed D. aided 4..Why does the author include the information that the magnetic north and south poles of the Earth switch on the average twice every million years A. To provide evidence showing that Earth's protective barrier is difficult to get through B. To show that it is reasonable to think that particles from a supernova explosion could have reached Earth C. To explain why some scientists believe a supernova explosion may have occurred near our solar system D. To help explain why some scientists have rejected the theory presented in paragraph 2 5..According to the theory discussed in paragraph 2，a weakening of Earth's magnetosphere may haveA. caused a supernova to explode near our solar systemcBBBBB. allowed gene-altering particles to reach Earth's surfaceC. forced Earth's magnetic field to change directionD. allowed clouds of protective particles to escape from Earth's upper atmosphere 6..AII of the following are mentioned in paragraph 3 as possible causes for the extinction of the dinosaurs EXCEPT A. a change in the diet of dinosaurs B. a change in the climate of the tropics C. a decrease in global temperatures D. a decrease in deep ocean salinity 7..ln paragraph 3，why does the author include the quotation by Carl Sagan A. To explain the connection between dinosaur extinction and the extinction of other animal species B. To support the claim about species extinction being due to indirect causes and effects C. To show that scientists have revised their ideas greatly in the last thirty years D. To identify the differences between the various theories for the extinction of dinosaurs 8..According to paragraph 4，what was one unusual aspect of the volcanic activity at the end of the Cretaceous A. Some explosions were much larger than Krakatoa. B. Eruptions occurred over a long period of time . C. Active volcanoes were sometimes separated by many kilometers. D. There were active volcanoes in the sea as well as on land. 9..Which of the following is presented in paragraph 4 as evidence that intense volcanic activity occurred at about the time that the dinosaurs became extinct A. The size of the volcanic craters on the Deccan plateau B. An increase in sea-floor spreading C. The formation in India of large amounts of a type of rock associated with volcanoes D. The occurrence of a thousand or more volcanic explosions the size of Krakatoa 10..The word severely in the passage is closest in meaning to A. certainly B. consequently C. greatly D. permanently11..The word reinforcing in the passage is closest in meaning toA. making possible A9iu ˇBDBcDB. spreadingC. introducingD. strengthening 12..According to paragraph 5，all of the following are theorized to have occurred as a result of volcanic activity EXCEPTA. a decrease in the amount of sunlight reaching Earth's surfaceB. a reduction in the number of sulfate aerosol veils in the stratosphereC. increased dryness in some areas that were once more humidD. changes in the atmosphere's composition resulting in an increase in temperature13.. Look at the four squares that indicate where the following sentence could be added to the passage.Thus ，ecosystems following periods of extensive volcanic activity necessarily had different combinations of species than earlier ecosystems did.Where would the sentence best fit Click on a square to add the sentence to the passage.14.. Drag your choices to the spaces where they belong. To review the passage ，click on View Text Answer ChoicesA. Cosmic rays from a nearby supernova explosion may have penetrated Earth's atmosphere ，causing genetic changes that dinosaur populations could not survive.B. Climate changes in the tropics may have set off a chain of indirect effects that negativelyaffected the ecosystems in which dinosaurs lived.C. The spread of lava over large pa 同s of previously favored habitats such as the DeccanPlateau may have made these favored areas uninhabitable for many years.D. Although the volcanic winter resulting from the formation of sulfate aerosols eventuallyended ，temperatures may have remained below levels required by dinosaurs to survive.E. Temperature changes and geographic shifts in climate zones due to the atmospheric effects ofvolcanic activity may have been significant enough to cause extinction.F. To be convincing ，theories about what caused dinosaurs to become extinct must be able toexplain the disappearance of other predators in the food chain at the same time BE A DB。