2019托福阅读：模拟试题及答案解析(6)

2019年托福阅读复习模拟练习题及答案解析六During the seventeenth and eighteenth centuries, almost nothing was written about the contributions of women duringthe colonial period and the early history of the newly formed United States. Lacking the right to vote and absent from the seats of power, women were not considered an important forcein history. Anne Bradstreet wrote some significant poetry in the seventeenth century, Mercy Otis Warren produced the best contemporary history of the American Revolution, and Abigail Adams penned important letters showing she exercised great political influence over her husband, John, the second President of the United States. But little or no notice was taken of these contributions. During these centuries, women remained invisible in history books.Throughout the nineteenth century, this lack ofvisibility continued, despite the efforts of female authors writing about women. These writers, like most of their male counterparts, were amateur historians. Their writings were celebratory in nature, and they were uncritical in their selection and use of sources.During the nineteenth century, however, certainfeminists showed a keen sense of history by keeping recordsof activities in which women were engaged. National, regional, and local women's organizations compiled accounts of their doings. Personal correspondence, newspaper clippings, and souvenirs were saved and stored. These sources from the coreof the two greatest collections of women's history in theUnited States one at the Elizabeth and Arthur Schlesinger Library at Radcliffé College, and the other the Sophia Smith Collection at Smith College. Such sources have provided valuable materials for later generations of historians.Despite the gathering of more information about ordinary women during the nineteenth century, most of the writing about women conformed to the "great women" theory of history, just as much of mainstream American history concentrated on "great men." To demonstrate that women were makingsignificant contributions to American life, female authors singled out women leaders and wrote biographies, or else important women produced their autobiographies. Most of these leaders were involved in public life as reformers, activists working for women's right to vote, or authors, and were not representative at all of the great of ordinary woman. The lives of ordinary people continued, generally, to be untoldin the American histories being published.1. What does the passage mainly discuss?(A) The role of literature in early American histories(B) The place of American women in written histories(C) The keen sense of history shown by American women(D) The "great women" approach to history used by American historians2. The word "contemporary" in line 6 means that the history was(A) informative(B) written at that time(C) thoughtful(D) faultfinding3. In the first paragraph, Bradstreet, Warren, and Adams are mentioned to show that(A) a woman's status was changed by marriage(B) even the contributions of outstanding women were ignored(C) only three women were able to get their writing published(D) poetry produced by women was more readily accepted than other writing by women4. The word "celebratory" in line 12 means that the writings referred to were(A) related to parties(B) religious(C) serious(D) full of praise5. The word "they" in line 12 refers to(A) efforts(B) authors(C) counterparts(D) sources6. In the second paragraph, what weakness in nineteenth-century histories does the author point out?(A) They put too much emphasis on daily activities(B) They left out discussion of the influence of money on politics.(C) The sources of the information they were based on were not necessarily accurate.(D) They were printed on poor-quality paper.7. On the basis of information in the third paragraph, which of the following would most likely have been collected by nineteenth-century feminist organizations?(A) Newspaper accounts of presidential election results(B) Biographies of John Adams(C) Letters from a mother to a daughter advising her how to handle a family problem(D) Books about famous graduates of the country's first college8. What use was made of the nineteenth-century women's history materials in the Schlesinger Library and the Sophia Smith Collection?(A) They were combined and published in a multivolume encyclopedia(B) They formed the basis of college courses in the nineteenth century.(C) They provided valuable information for twentieth-century historical researchers.(D) They were shared among women's colleges throughout the United States.9. In the last paragraph, the author mentions all of the following as possible roles of nineteenth-century "great women" EXCEPT(A) authors(B) reformers(C) activists for women's rights(D) politicians10. The word "representative" in line 29 is closest in meaning to(A) typical(B) satisfied(C) supportive(D) distinctiveBBBDB CCCDA。

2019年托福考试考场模拟训练题及答案6Rent control is the system whereby the local government tells building owners how much they can charge their tenants in rent. In the United States, rent controls date back to at least World War II.In 1943 the federal government imposed rent controls to help solve the problem of housing shortages during wartime. The federal program ended after the war, but in some locations, including New York City, controls continued. Under New York's controls, a landlord generally cannot raise rents on apartments as long as the tenants continue to renew their leases. In places such as Santa Monica, California, rent controls are more recent. They were spurred by the inflation of the 1970's, which, combined with California's rapid population growth, pushed housing prices, as well as rents, to record levels. In 1979 Santa Monica's municipal government ordered landlords to roll back their rents to the levels charged in 1978. Future rents could only go up by two-thirds as much as any increase in the overall price level.In any housing market, rental prices perform three functions： (1) promoting the efficient maintenance of existing housing and stimulating the construction of new housing, (2) allocating existing scarce housing among competing claimants, and (3) rationing use of existing housing by potential renters.One result of rent control is a decrease in the construction of new rental units. Rent controls haveartificially depressed the most important long-term determinant of profitability — rents. Consider some examples. In a recent year in Dallas, Texas, with a 16 percent rental vacancy rate but no rent control laws, 11,000 new housingunits were built. In the same year, in San Francisco, California, only 2,000 units were built. The major difference? San Francisco has only a 1.6 percent vacancy rate butstringent rent control laws. In New York City, except for government-subsidized construction, the only rental unitsbeing built are luxury units, which are exempt from controls. In Santa Monica, California, new apartments are not being constructed. New office rental space and commercial developments are, however. They are exempt from rent controls.1. What does the passage mainly discuss?(A) The construction of apartments in the United States.(B) Causes and effects of rent control(C) The fluctuations of rental prices(D) The shortage of affordable housing in the United States.2. The word "They" in line 9 refers to(A) the tenants(B) their leases(C) places(D) rent controls.。

2019年6月1日托福阅读考试真题及答案上周的托福考试已经顺利结束，参加考试的考生对答案肯定很关注。

接下来就和看一看2019年6月1日托福阅读考试真题及答案。

Passage 1 Megafauna Extinctions in Ancient Australia古澳大利亚大型哺乳动物的灭绝（重复2018.12.01）话题重复2018.03.11 The Australian Megafauna Extinctions。

生物史上大型动物的灭绝在各个地方情况有所不同。

而究其灭绝原因，科学家提出了两种说法，一是climate，一是认为hunt。

Passage 2 The Formation of Early Earth早期地球的形成（首考新题）Passage 3 Colonial America and the Navigation Acts 殖民时期的美国和航海法案（重复2015.03.07）先讲了早期英国殖民者对美洲的殖民引起了一些不满，因为收税过高且限制他们的一些产品与英国竞争。

后面着重讲其实这种殖民统治也对美国经济有好处，如帮他们买产品到欧洲，有英国海军保护等。

最后说美国农民虽然参与市场经济，但前提还是满足自己，所以也会通过生产来和别人换。

Passage 4 Mexican Mural Art墨西哥壁画艺术（重复2015.09.19）第一段：壁画艺术出现及原因分析。

墨西哥壁画艺术的主题主要涉及社会政治问题，伴随呼唤打破以欧洲为中心的文化依赖，寻求真正的自我表达的艺术形式，这是拉美第一个现代艺术运动，影响深远。

该艺术的出现紧跟在墨西哥革命之后，原因是多样的：1.受到革命乐观主义的影响；2.文化上追求突破欧洲为中心的传统，去寻找艺术的自由表达尝试；3.由一批成熟有力的艺术家领导；4.收到有远见的教育部长的支持，拨钱拨场地给艺术家去使用。

第二段：风格定性。

艺术家的共同信仰：墨西哥壁画艺术家都相信艺术的力量去改造成为一个更好的社会、去挑战陈规旧习、去丰富国民的文化生活；现代性：该艺术也是现代的，因为其创作目的是去挑战老旧传统；大众性：该艺术还是一种平易近人的大众艺术，是为了教育启蒙大众，尤其是工人阶级。

2019年托福阅读考试真题答案2019年托福阅读考试真题答案（网友版）1、鸟类是恐龙的后代；2、陨石为什么对地球形成有影响；3、落叶树与长青树；4、讲fish在temperate water和permanent water，然后fun gi在这俩不同环境里对植物的作用，然后为了提高生产农业上的应用；5、一种动物数量减少的三个因素。

人为的物种引进，但是clim ate最显著，让migrate提前；6、讲化学风化和生物风化。

chemistry weathering 跟biolog y weathering，讲rock腐蚀。

有三种过程：水化氧化和碳酸化，化学的有三种：湿度、氧气、钙化物；7、temporary pools，主要说生物在这些pool里的好处，比如说main predator fish没法在那个dry的环境里生存之类的8、碳断代法在北美F考古点的应用。

最初的研究发现人类最早在north American，是F群落，然后研究sample来证明中间出了问题，但是后来reexam的时候证实了，但是后来又discovery了一些spearpoints，发现其实Celvius更早。

是Radio Carbon一个方法分析一个人种的时间，大长段落。

一直以为是很古老的，但是俩人做了research以后发现比它年轻很多，然后有人又做了research证明确实如此；9、在16世纪，欧洲人口增长了大约三分之一。

人口的增长极大地影响了普通欧洲人的生活。

第一阶段的增长有益的，农场的盈余带动了城镇的经济增长。

然而随着人口增多问题也逐渐显现，对政府财政和普通人的生活都造成了严重影响；10、土星pluto’s status；11、蝙蝠定位bats echolocation12、New England农业13、天文，chronites14、动物数量和捕食数量，成功率的关联；15、19世纪美国的文化与艺术。

主要讲美国文学从英国中分离，逐渐演化出国家特色和民族特色，举了很多名人、作家和艺术家的例子；16、一篇讲bat，超声波回声定位，很精准可以捕捉猎物。

2019年托福阅读模拟试题及答案托福阅读模拟试题The war for independence from Britain was a long and economically costly conflict. The New England fishingindustry was temporarily destroyed, and the tobacco colonies in the South were also hard hit. The trade in imports was severely affected, since the war was fought against the country that had previously monopolized the colonies’ supply of manufactured goods. The most serious consequences werefelt in the cities, whose existence depended on commercial activity. Boston, New York, Philadelphia, and Charleston were all occupied for a time by British troops. Even when the troops had left, British ships lurked in the harbors and continued to disrupt trade.American income from shipbuilding and commerce declined abruptly, undermining the entire economy of the urban areas. The decline in trade brought a fall in the American standard of living. Unemployed shipwrights, dock laborers, and coopers drifted off to find work on farms and in small villages. Some of them joined the Continental army, or if they were loyal to Britain, they departed with the British forces. The population of the New York City declined from 21,000 in 1774 to less than half that number only nine years later in 1783.The disruptions produced by the fighting of the war, by the loss of established markets for manufactured goods, by the loss of sources of credit, and by the lack of new investment all created a period of economic stagnation that lasted for the next twenty years.1.Why does the author mention the fishing industry and the tobacoo colonies?A. to show how the war for independence affected the economyB. to compare the economic power of two different regionsC. to identify the two largest commercial enterprises in AmericaD. to give examples of industries controlled by British forces2. Why does the author mention the population of New York City in paragraph 2?A. to show that half of New York remained loyal toBritainB. to compare New York with other cities occupied during the warC. to emphasize the great short-term cost of the war for New YorkD. to illustrate the percentage of homeless people in New York3. Chinese people had fought for independence fromforeign countries for more than 100 years; we had lost lands, powers, resources and lives during that period. Today, China faces a new challenge that how the development can maintain, in other words, how China doesn’t lag behind. Please write an essay to express your ideas.答案：1.A 2.C。

2019年托福考试阅读理解模拟练习题及答案Hormones in the BodyUp to the beginning of the twentieth century,the nervous system was thought to control all communication within the body and the resulting integration of behavior.Scientists had determined that nerves ran,essentially,on electricalimpulses.These impulses were thought to be the engine for thought,emotion,movement,and internal processes such as digestion.However,experiments by William Bayliss and Ernest Starling on the chemical secretin,which is produced in thesmall intestine when food enters the stomach,eventually challenged that view.From the small intestine,secretin travels through the bloodstream to the pancreas.There,it stimulatesthe release of digestive chemicals.In this fashion,the intestinal cells that produce secretin ultimately regulate the productionof different chemicals in a different organ,the pancreas.Such a coordination of processes had been thought to require control by the nervous system;Bayliss and Starling showed that it could occur through chemicals alone.This discovery spurred Starling to coin the term hormone to referto secretin,taking it from the Greek word hormon,meaning “to excite ”or “to set in motion. ”A hormone is a chemicalproduced by one tissue to make things happen elsewhere.As more hormones were discovered,they werecategorized,primarily according to the process by which theyoperated on the body.Some glands(which make up the endocrinesystem)secrete hormones directly into the bloodstream.Suchglands include the thyroid and the pituitary.The exocrine system consists of organs and glands that produce substances that are used outside the bloodstream,primarily for digestion.The pancreas is one such organ,although it secretes some chemicals into the blood and thus is also part of the endocrine system.Much has been learned about hormones since their discovery.Some play such key roles in regulating bodily processes or behavior that their absence would cause immediate death.The most abundant hormones have effects that are less obviously urgent but can be more far-reaching and difficult to track ：They modify moods and affect human behavior,even some behavior we normally think of as voluntary.Hormonal systems are very intricate.Even minute amounts of the right chemicals can suppress appetite,calm aggression,and change the attitude of a parent toward a child.Certain hormones accelerate the development of the body,regulating growth and form;others may even define an individual ’s personality characteristics.The quantities and proportions of hormones produced change with age,so scientists have given a great deal of study to shifts in the endocrine system over time in the hopes of alleviating ailments associated with aging.In fact,some hormone therapies are already very common.A combination of estrogen and progesterone has been prescribed for decades to women who want to reduce mood swings,sudden changes in body temperature,and other discomforts caused by lower natural levels of those hormones as they enter middle age.Known as hormone replacement therapy(HRT),the treatment was also believed to prevent weakening of the bones.At leastone study has linked HRT with a heightened risk of heartdisease and certain types of cancer.HRT may also increase the likelihood that blood clots — dangerous because they could travel through the bloodstream and block major bloodvessels — will form.Some proponents of HRT have tempered their enthusiasm in the face of this new evidence,recommending it only to patients whose symptoms interfere with their abilities to live normal lives.Human growth hormone may also be given to patientswho are secreting abnormally low amounts on their own.Becauseof the complicated effects growth hormone has on the body,such treatments are generally restricted to children who would be pathologically small in stature without it.Growth hormone affectsnot just physical size but also the digestion of foodand the aging process.Researchers and family physicianstend to agree that it is foolhardy to dispense it in cases inwhich the risks are not clearly outweighed by the benefits.27.The word engine in the passage is closest in meaningto(A)desire(B)origin(C)science(D)chemical28.The word it in the passage refers to(A)secretin(B)small intestine(C)bloodstream(D)pancreas29.The word spurred in the passage is closest in meaning to(A)remembered(B)surprised(C)invented(D)motivated30.To be considered a hormone,a chemical produced in the body must(A)be part of the digestive process(B)influence the operations of the nervoussystem (C)affect processes in a different part ofthe body (D)regulate attitudes and behavior31.The glands and organs mentioned in paragraph3 are categorized according to(A)whether scientists understand their function(B)how frequently they release hormones into the body(C)whether the hormones they secrete influence the aging process(D)whether they secrete chemicals into the bloodParagraph 3 is marked with an arrow[→]32.The word key in the passage is closest in meaning to(A)misunderstood(B)precise(C)significant(D)simple33.The word minute in the passage is closest in meaningto(A)sudden(B)small(C)changing(D)noticeable34.Which of the sentences below best expressesthe essential information in the highlighted sentence in the passage?Incorrect answer choices change the meaningin important ways or leave out essential information.(A)Most moods and actions are not voluntary because they are actually produced by the production of hormones in the body.(B)Because the effects of hormones are difficultto measure,scientists remain unsure how far-reachingtheir effects on moods and actions are.(C)When the body is not producing enough hormones,urgent treatment may be necessary to avoid psychological damage.(D)The influence of many hormones is not easy tomeasure,but they can affect both people’s psychology and actions extensively.35.The word tempered in the passage isclosest in meaning to(A)decreased(B)advertised(C)prescribed(D)researched36.Which patients are usually treated withgrowth hormone?(A)Adults of smaller statue than normal(B)Adults with strong digestive systems(C)Children who are not at risk from the treatment(D)Children who may remain abnormally small37.Which of the following sentences explains theprimary goal of hormone replacement therapy?These sentences are highlighted in the passage.(A)The quantities and proportions of hormones produced change with age,so scientists have given a great deal of study to shifts in the endocrine system over time in the hopes of alleviating ailments associated with aging.(B)A combination of estrogen and progesterone has been prescribed for decades to women who want to reduce moodswings,sudden changes in body temperature,and other discomforts caused by lower natural levels of thosehormones as they enter middle age.(C)HRT may also increase the likelihood that bloodclots —dangerous because they could travel through the bloodstream and block major blood vessels—will form.(D)Because of the complicated effects growth hormonehas on the body,such treatments are generally restricted to children who would be pathologically small in stature without it.38.Look at the four squares that indicate where the following sentence could be added to the passage.The body isa complex machine,however,and recent studies have called into question the wisdom of essentially trying to fool its systemsinto believing they aren ’ t aging.Where would the sentence best fit?Click on a square to add the sentence to the passage.39.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 belongin the summary because they express ideas that arenot presented in the passage or are minor ideas in the passage.This question is worth 2 points.The class of chemicals called hormones was discovered by two researchers studying a substance produced in the small intestine.Answer ChoicesThe term hormone is based on a Greek word that means"to excite"or"to set in motion."Researchers are looking for waysto decrease the dangers of treatments with growth hormone so that more patients can benefit from it.Hormones can be given artificially,but such treatments have risks and must be used carefully.Hormones can affect not only life processes such as growth but also behavior and emotion.Scientists have discovered that not only thenervous system but also certain chemicals can affectbodily processes far from their points of origin.Hormone replacement therapy(HRT)may increase the risk of bloodclots and heart disease in middle-age women.Answer KeysReading ：27.B28.A29.D30.C31.D32.C33.B34.D35.A36.D37.A38.third square39.1)Scientists have discovered that not only thenervous system .2)Hormones can affect not only life processes? ..3)Researchers are looking for ways to decrease the dangers of .。

2019年托福阅读模拟试题及答案：管弦乐音响A series of mechanical improvements continuing well into the nineteenth century, including the introduction of pedalsto sustain tone or to soften it, the perfection of a metal frame and steel wire of the finest quality, finally producedan instrument capable of myriad tonal effects from the most delicate harmonies to an almost orchestral fullness of sound，from a liquid，singing tone to a sharp, percussive brilliance.(介词结构from…to…作定语)持续到19世纪的一系列机械上的改进，包括引入踏板以维持音调或使其柔和，改善金属框架，以及使用牲能的钢丝，最终产生了一种具备无数音调效果的乐器——这些效果涵盖了从最精致的和声到几乎全部的管弦乐音响，从明快流畅的吟唱音调到尖锐的打击乐器的恢弘气氛。

分句1：A series of mechanical improvements continuingwell into the nineteenth century;分句2：including the introduction of pedals to sustain tone or to soften it;分句3：the perfection of a metal frame and steel wire of the finest quality;分句4：finally produced an instrument capable of myriad tonal effects;分句5：from the most delicate harmonies to an almost orchestral fullness of sound;分句6：from a liquid，singing tone to a sharp, percussive brilliance。

2019年1月7日托福阅读答案解析>>>免费试听：【四科联报】托福听说读写临考预测班(针对1月考)第一篇： Electric Lighting and the American Homes内容回忆：本文共6段第一段，讲到19世纪末，20世纪初美国工业和交通用电在白天达到顶峰。

电力供应在夜里有剩余，电力企业在寻求会在夜里消费电力的新领域。

虽然线路铺的普及，电网建设成本下降。

家庭用电开始兴起。

但局限于小范围的富余家庭。

第二段，电力改变了美国的家庭(统领全文主旨句)。

介绍家庭用电普及之前，美国的家庭主要靠燃烧汽灯照明。

例举了汽灯的诸多弊端，如，光线昏暗，燃烧放出烟，放出有毒气体。

然后讲到了美国家庭的房屋特点，为适合汽灯照明，一般空间较大，房间较多。

然后电力输送成本下降后，逐渐开始有家庭用电来照明，电力照明带来诸多好处，如光线改善，没有有毒气体等等。

第三段，建造师们观察到了家庭用电带来的变化，开始设计新的房屋格局，以便适合电力照明。

虽然成本有下降，但是电力照明的成本相对汽灯还是偏高。

所以建筑师们开始设计出缩小了的房屋空间，比如设计出了类似于我们今天的客厅，餐厅，厨房，跟以前比，也缩小了尺寸。

合并了一些以前房屋的生活空间。

第四段，讲到家庭用电成本的降低，电力企业发现了家庭用电是个新的市场，增大了投入，随着电网的普及，用电成本下降，使得家庭用电越来越普及。

第五段，例举了美国的bungalow这种房屋，即单层*房。

从1900年到1920，这种单层*房数列骤增到700多万。

因为空间较以前的多层大房子小，用电量相对较少。

节约了用电量，被大多美国数家庭接受。

第六段，家庭用电还改变了美国人的生活，尤其是在阅读方面。

因为照明条件的改善，越来越堵的美国人喜欢花更多的时间来阅读，成年人也能够花更多的时间陪孩子们阅读，增进了家庭沟通。

美国家庭阅读量的增加，从图书馆借出的书籍数量得到了证实。

词汇题：1. properties = characteristics2. substantially = significantly3. allegedly = supposedly4. apparent = obvious第二篇：Extinction of the Mammoths内容回忆：本文共8段第一段，介绍Mammoths(猛犸象)生活的时间，和灭绝的时间。

2019年5月26日托福阅读考试真题及解析最新一期的托福考试已经圆满结束，这次的考试引发了大家的热议。

今天就和一起看看2019年5月26日托福阅读考试真题及解析。

Passage1 Isolation and Diversification in the Tropical Rainforest热带雨林物种隔离与多样性（重复2016.07.10）热带雨林物种多，那里的植被超过1000种，欧洲有40种。

由于大平原的动物要走很久才能寻找到合适的生活地点，热带雨林的动物不能，他们被限制在有限的空间内，所以热带雨林物种很多。

热带雨林里的屏障阻碍动物们的扩散，描述了如何阻碍。

树冠（canopy）是热带雨树中浓密的树叶和枝干各种交织形成的，动物们很难突破这层canopy，只能在最高层的这层canopy之下活动，所以无法扩散到外界。

所以限制在内的植物们就多样化（diversify）。

50-70米是超级高的且喜阳光的树种们为了晒太阳浴而拼命生长突破最高canopy形成的。

因此有种s鸟就生活在这里，他们可以去任何地方，所以列举了三个州有这种鸟，而且种类较少，他们俯瞰着森林。

紧接着讲k这种树，因为突破canopy长得高，可以将种子散播更远，于是south American都有这种树。

Passage 2 The Theories of Megafauna Extinction大型动物灭绝理论（重复2018.08.26，2017.01.07）讲的是某一时期哺乳动物大范围灭绝的原因：先说可能是由于气候变化，但是文章后面进行了否定，因为之前也有气候变化，但是也没有灭绝。

然后猜测和人类捕杀有关，但澳洲等一些地方的考古证明一些灭绝的动物已经和人类和平共处了上千年，而且一些人类更爱捕杀的动物如reindeer反而没有灭绝。

最后说人类活动间接导致了这些动物的灭绝。

Passage 3 Flightless Bird不会飞的鸟（重复2019.01.26，2018.03.10）岛屿上退化掉飞行能力的鸟。

2019年托福阅读真题解析：泥土如何形成5月28日托福阅读真题三篇文章是Reconstructing Prehistoric Human Lifestyle(重建史前人类的生活方式)，How Soil isFormed(泥土如何形成)和Mate Choice In Birds(鸟类配偶选择)。

分别重复2015.09.17第一篇，2014.07.12第二篇，和2015.10.24第三篇，是典型的老题拼盘重复。

三篇文章，集合了人类考古、地质和生物学三个常见话题，专业词汇泛滥，长难句增多，篇章结构的整体性增强。

下面，给出今天第二篇和第三篇文章的知识框架和词汇串讲。

第二篇 How Soil is Formed(泥土如何形成)第1段：泥土形成是一个动态过程(a dynamic process)，受到母体材料(parent material)、气候、地形(topography)和时间的影响。

第2段：母体材料是松散的一堆物质(unconsolidated mass)，在此之上泥土开始形成。

来源上看，母体材料能够是原处的地质基底物质(geological substrate)，也能够是通过风吹、水流、冰川移动或重力沉降而从远处带来的沉淀物(sediment/deposit)。

因为远方沉淀物的多样性，所以由远方沉淀物形成的泥土往往更肥沃(fertile)。

不管母体材料的来源是什么，最终形成的泥土组成都是地质岩石类物质，例如火成岩(igneous rocks)、沉淀岩(sedimentary rocks)和变质岩(metamorphic rocks)，这些岩石的化学组成决定了泥土的组成。

第3段：气候影响着风化过程的强度和性质(the intensity and nature of weathering)，并且影响着当地植被类型(vegetation type)，这些进而都对泥土形成产生影响。

具体来看，日温差和季节温差导致泥土物质的冷热交替。

2019年托福阅读模拟试题及答案解析托福阅读原文The Development of Steam Power【1】By the eighteenth century, Britain wasexperiencinga severe shortage of energy. Because ofthe growth of population, most of the great forests of medieval Britain had long ago beenreplaced by fields of grain and hay. Wood was in ever-shorter supply, yet it remainedtremendously important.It served as the primary source of heat for all homes and industriesand as a basic raw material. Processed wood (charcoal) was the fuel that was mixed with ironore in the blast furnace to produce pig iron (raw iron). The iron industry’s appetite for woodwas enormous, and by 1740 the British iron industry was stagnating. Vast forests enabledRussia to become the world’s leading producer of iron, much of which was exported to Britain. But Russia’spotential for growth was limited too, and in a few decades Russia would reach thebarrier of inadequate energy that was already holding England back.【2】As this early energy crisis grew worse, Britain looked toward its abundant and widelyscattered reserves ofcoal as an alternative to its vanishing wood. Coal was first used in Britainin the late Middle Ages as a source of heat.By 1640 most homes in London were heated withit, and it also provided heat for making beer, glass, soap, and other products. Coal was notused, however, to produce mechanical energy or to power machinery. It was there thatcoal’spotential wad enormous.【3】As more coal was produced, mines were dug deeper and deeper and were constantlyfilling with water. Mechanical pumps, usually powered by hundreds of horses waling incircles atthe surface, had to be installed Such power was expensive and bothersome. In an attempt toovercome these disadvantages, Thomas Savery in 1698 and Thomas Newcomen in 1705 invented the first primitive steam engines. Both engines were extremely inefficient. Bothburned coal to produce steam, which was then used to operate a pump. However, by theearly 1770s, many of the Savery engines and hundreds of the Newcomen engines wereoperating successfully, though inefficiently, in English and Scottish mines.【4】In the early 1760s, a gifted young Scot named James Watt was drawn to a critical studyof the steam engine. Watt was employed at the time by the University of Glasgow as a skilledcrafts worker making scientific instruments. In 1763：Watt was called on to repair a Newcomenengine being used in a physics course. After a series of observations, Watt saw that theNewcomen’s waste of energy could be reduced by adding a separate condenser. This splendidinvention, patented in 1769, greatly increased the efficiency of the steam engine. The steamengine of Watt and his followers was the technological advance that gave people, at least for awhile, unlimited power and allowed the invention and use of all kinds of power equipment.【5】The steam engine was quickly put to use in several industries in Britain. It drained minesand made possible the production of ever more coal to feed steam engines elsewhere. Thesteam power plant began to replace waterpower in the cotton-spinning mills as well as otherindustries during the1780s, contributing to a phenomenal rise in industrialization. TheBritish iron industry was radically transformed. The useof powerful, steam-driven bellows inblast furnaces helpediron makers switch over rapidly from limited charcoal to unlimited coke(which is made from coal) in the smelting ofpig iron (the process of refining impure iron) after1770 inthe 1780s, Henry Cort developed the puddling furnace, which allowed pig iron to berefined in turn with coke. Cort also developed heavy-duty, steam-powered rolling mills, whichwere capable of producing finished iron in every shape and form.【6】The economic consequence of these technical innovations in steam power was a greatboom in the Britishiron industry. In 1740 annual British iron production wasonly 17：000 tons, but by 1844： with the spread of coke smelting and the impact of Cort’s inventions, ithadincreased to 3,000：000 tons. This was a truly amazing expansion. Once scarce and expensive, iron became cheap, basic, and indispensable to the economy.托福阅读试题1.What can be inferred from paragraph 1 aboutBritain's short supply of wood in the eighteenthcentury?A.Wood from Britain’s great forests was beingexportedto other countries for profit.B.A growing population had required cutting down forests to increase available land forfarming.rger families required the construction of larger homes made from wood.D.What was left of the great forests after the medieval period was being strictly protected.2.Select TWO answer choices that, according to paragraph 1, are true statementsabout Russia’s iron industry in the eighteenth century. To obtain credit, you mustselect TWO answer choices.A.Russia reached its maximum production of iron at the same time as Britain.B.Russia exported much of its iron production to Britain.C.Russia’s appetite for iron increased rapidly after 1740.D.Russia’s energy resourceseventually becameinsufficient and limited the growth of its iron industry.3.The word "abundant" in the passage is closest in meaning toA.reliableB.plentifulC.well-preservedD.existing4.Why are "beer, glass, soap, and other products" mentioned in the discussion ofBritain’s energy?A.To help explain why the energy crisis was so severeB.To show that despite the energy crisis and as early as 1640, London homes were advancedand well suppliedC.To emphasize that after 1640, British homes required energy for more than heatD.To indicate that coal had been used for the production of certain products before theeighteenth century5.According to paragraph 3, all of the following are ways in which the Savery andNewcomen engines were similar EXCEPT：A.Both became relatively inexpensive after the 1770s.B.Both produced steam by burning coal.C.Both were used to operate pumps.D.Both were very inefficient.6.The word "gifted" in the passage is closest in meaning toA.independentB.talentedC.famousD.ambitious7.According to paragraph 4, what was James Watt’s major achievement?A. He was able to apply his understanding of physics to invent a variety of scientificinstruments and tools for skilled crafts workers.B.He taught university physics courses to outstanding students whose observations led tomany patented inventions.C.He improved the efficiency of Newcomen’s engine by preventing energy from being lost.D.He redesigned Newcomen’s engine so that it no longer needed a separate condenser.8.The word "splendid" in the passage is closest in meaning toA.originalB.necessaryC.magnificentD.popular9.Which of the following is NOT mentioned in paragraph 5 as a development thatgreatly changed the production of iron?A.The use of coke in the smelting of pig ironB.The invention of a furnace that used coke to refine ironC.The discovery of a method for increasing the production of charcoalD.The invention of powerful machinery that could shape, form, and finish iron10.In paragraph 6, why does the author compare British iron production in 1740 withthat of 1844?A.To contrast the amounts of iron needed in Britain in two different centuriesB.To illustrate how easy it was to make money using Cort’s inv entionC.To demonstrate the tremendous growth of the iron industry in BritainD.To demonstrate how inexpensive coal had become11.The word "indispensable" in the passage is closest in meaning toA.advantageousB.essentialC.less costlyD.highly stimulating12.According to the passage, which of the following is true about the development ofsteam power?A.The steam engine’s basic technology can be traced back to medieval Britain when steam-powered machinery was being tried in farming activities.B.Although Russia and Britain developed steam-power technology simultaneously, Britain wasfirst to try it in a large-scale industry due to a greater need for iron.C.Steam-power technology was largely the result of improvements developed to increase thesupply of coal as a primary source of energy.D.Adaptations to steam engines required for their use in cotton-spinning mills led to radicaldevelopments in machinery used in the iron industry.13. Look at the four squares [■] that i ndicate where the following sentence could beadded to the passage. Where would the sentence best fit? Energy had not been aproblem for Britain in the past because it relied on a rich source of energy： its vastforests.By the eighteenth century, Britain was experiencing a severe shortage of energy. ■【A】 Because of the growth of population, most of the great forests of medieval Britain had longago been replaced by fields of grain and hay. ■【B】Wood was in ever-shorter supply, yet itremained tremendouslyimp ortant. ■【C】It served as the primary source of heat for allhomes and industries and as a basic raw material. ■【D】Processed wood (charcoal) was thefuel that was mixed withiron ore in the blast furnace to produce pig iron (raw iron). The ironindustry’s appe tite for wood was enormous, and by 1740 the British iron industry wasstagnating. Vast forests enabled Russia to become the world’s leading producer of iron, much ofwhich was exported to Britain. But Russia’s potential for growth was limited too, and in a fewdecades Russia would reach the barrier of inadequate energy that was already holdingEngland back.14. Directions： An introductory sentence for a brief summary of the passage of thepassage is provided below. Complete the summary by selecting the THREE answerchoicesthat express the most important ideas in the passage. Some answer choicesdo not belong in the summary because they express ideas that are not presented inthe passage or are minor ideas in the passage. This questions is worth 2 points.By the eighteenth century, Britain was experiencing a severe shortage of energy.A.The development of blast furnaces for the manufacture of pig iron made the Britain lessdependent on wood.B.After the medieval period, both Russia and Britain began to look for alternative sources ofenergy, such as steam power, in order to maintain the growth of their iron industries.C.Two inventors designed the first steam engines in order to overcome the disadvantages ofrelying on horses to power the pumps used in mining coal.D.James Watt was able to improve upon the efficiency of the steam engine and make it usefulto several industries.E.The puddling furnace increased the availability of charcoal to a variety of industries fromcotton to iron production.F.Steam power increased coal production, which in turn allowed extraordinary growth of theiron industry and the British economy.托福阅读答案1.B2.BD3.B4.D5.A6.B7.C8.C9.C10.C11.B12.C13.A14.CDF。

2019年托福阅读模拟试题及答案：Hormones inthe BodyHormones in the BodyUp to the beginning of the twentieth century, the nervous system was thought to control all communication within the body and the resulting integration of behavior. Scientists had determined that nerves ran, essentially, on electrical impulses. These impulses were thought to be the engine for thought, emotion, movement, and internal processes such as digestion. However, experiments by William Bayliss and Ernest Starling on the chemical secretin, which is produced in the small intestine when food enters the stomach, eventually challenged that view. From the small intestine, secretin travels through the bloodstream to the pancreas. There, it stimulates the release of digestive chemicals. In this fashion, the intestinal cells that produce secretinultimately regulate the production of different chemicals in a different organ, the pancreas.Such a coordination of processes had been thought to require control by the nervous system; Bayliss and Starling showed that it could occur through chemicals alone. This discovery spurred Starling to coin the term hormone to refer to secretin, taking it from the Greek word hormon, meaning "to excite" or "to set in motion." A hormone is a chemical produced by one tissue to make things happen elsewhere.As more hormones were discovered, they were categorized, primarily according to the process by which they operated onthe body. Some glands (which make up the endocrine system) secrete hormones directly into the bloodstream. Such glands include the thyroid and the pituitary. The exocrine system consists of organs and glands that produce substances that are used outside the bloodstream, primarily for digestion. The pancreas is one such organ, although it secretes some chemicals into the blood and thus is also part of the endocrine system.Much has been learned about hormones since their discovery. Some play such key roles in regulating bodily processes or behavior that their absence would cause immediate death. The most abundant hormones have effects that are less obviously urgent but can be more far-reaching and difficult to track： They modify moods and affect human behavior, even some behavior we normally think of as voluntary. Hormonal systems are very intricate. Even minute amounts of the right chemicals can suppress appetite, calm aggression, and change the attitude of a parent toward a child. Certain hormones accelerate the development of the body, regulating growth and form; others may even define an individual's personality characteristics. The quantities and proportions of hormones produced change with age, so scientists have given a great deal of study to shifts in the endocrine system over time in the hopes of alleviating ailments associated with aging.In fact, some hormone therapies are already very common.A combination of estrogen and progesterone has been prescribed for decades to women who want to reduce mood swings, sudden changes in body temperature, and other discomforts caused by lower natural levels of those hormonesas they enter middle age. Known as hormone replacement therapy (HRT), the treatment was also believed to prevent weakening of the bones. At least one study has linked HRT with a heightened risk of heart disease and certain types of cancer. HRT may also increase the likelihood that bloodclots-dangerous because they could travel through the bloodstream and block major blood vessels-will form. Some proponents of HRT have tempered their enthusiasm in the face of this new evidence, recommending it only to patients whose symptoms interfere with their abilities to live normal lives.Human growth hormone may also be given to patients who are secreting abnormally low amounts on their own. Because of the complicated effects growth hormone has on the body, such treatments are generally restricted to children who would be pathologically small in stature without it. Growth hormone affects not just physical size but also the digestion of food and the aging process. Researchers and family physicians tend to agree that it is foolhardy to dispense it in cases in which the risks are not clearly outweighed by the benefits.27. The word engine in the passage is closest in meaning to(A) desire(B) origin(C) science(D) chemical28. The word it in the passage refers to(A) secretin。

2019 年托福考试阅读理解模拟练习题及答案Hormones in the BodyUp to the beginning of the twentieth century,the nervous system was thought to control all communication within thebody and the resulting integration of behavior.Scientists had determined that nerves ran,essentially,on electricalimpulses.These impulses were thought to be the engine for thought,emotion,movement,and internal processes such as digestion.However,experiments by William Bayliss and Ernest Starling on the chemical secretin,which is produced in thesmall intestine when food enters the stomach,eventuallychallenged that view.From the small intestine,secretin travelsthrough the bloodstream to the pancreas.There,it stimulatesthe release of digestive chemicals.In this fashion,the intestinalcells that produce secretin ultimately regulate the productionof different chemicals in a different organ,the pancreas.Such a coordination of processes had been thought torequire control by the nervous system;Bayliss and Starlingshowed that it could occur through chemicals alone.Thisdiscovery spurred Starling to coin the term hormone to refer“to to secretin,taking it from the Greek word hormon,meaningexcite ”or “to set in motion. ”A hormone is a chemicalproduced by one tissue to make things happen elsewhere.As more hormones were discovered,they werecategorized,primarily according to the process by which theyoperated on the body.Some glands(which make up the endocrine system)secrete hormones directly into the bloodstream.Suchglands include the thyroid and the pituitary.The exocrinesystem consists of organs and glands that produce substances that are used outside the bloodstream,primarily fordigestion.The pancreas is one such organ,although it secretes some chemicals into the blood and thus is also part of the endocrine system.Much has been learned about hormones since their discovery.Some play such key roles in regulating bodily processes or behavior that their absence would cause immediate death.The most abundant hormones have effectsthat are less obviously urgent but can be more far-reaching and difficult to track ：They modify moods and affect human behavior,even some behavior we normally think of as voluntary.Hormonal systems are very intricate.Even minute amounts of the right chemicals can suppress appetite,calm aggression,and change the attitude of a parent toward achild.Certain hormones accelerate the development of the body,regulating growth and form;others may even define an individual ’s personality characteristics.The quantities and proportions of hormones produced change with age,soscientists have given a great deal of study to shifts in the endocrine system over time in the hopes of alleviatingailments associated with aging.In fact,some hormone therapies are already very common.A combination of estrogen and progesterone has been prescribed for decades to women who want to reduce mood swings,sudden changes in body temperature,and other discomforts caused by lower natural levels of those hormones as they enter middle age.Known as hormone replacement therapy(HRT),the treatment was also believed to prevent weakening of the bones.At leastone study has linked HRT with a heightened risk of heartdisease and certain types of cancer.HRT may also increase the likelihood that blood clots —dangerous because they could travel through the bloodstream and block major bloodvessels —will form.Some proponents of HRT have tempered their enthusiasm in the face of this new evidence,recommending it only to patients whose symptoms interfere with theirabilities to live normal lives.Human growth hormone may also be given to patients who are secreting abnormally low amounts on their own.Because ofthe complicated effects growth hormone has on the body,such treatments are generally restricted to children who would be pathologically small in stature without it.Growth hormone affects not just physical size but also the digestion of foodand the aging process.Researchers and family physicians tendto agree that it is foolhardy to dispense it in cases inwhich the risks are not clearly outweighed by the benefits.27.The word engine in the passage is closest in meaningto(A)desire(B)origin(C)science(D)chemical28.The word it in the passage refers to(A)secretin(B)small intestine(C)bloodstream(D)pancreas29.The word spurred in the passage is closest in meaning to(A)remembered(B)surprised(C)invented(D)motivated30.To be considered a hormone,a chemical produced in the body must(A)be part of the digestive process(B)influence the operations of the nervoussystem (C)affect processes in a different part ofthe body (D)regulate attitudes and behavior31.The glands and organs mentioned in paragraph 3are categorized according to(A)whether scientists understand their function(B)how frequently they release hormones into the body(C)whether the hormones they secrete influence the aging process(D)whether they secrete chemicals into the bloodParagraph 3 is marked with an arrow[→]32.The word key in the passage is closest in meaning to(A)misunderstood(B)precise(C)significant(D)simple33.The word minute in the passage is closest in meaning to(A)sudden(B)small(C)changing(D)noticeable34.Which of the sentences below best expressesthe essential information in the highlighted sentence in the passage?Incorrect answer choices change the meaning in important ways or leave out essential information.(A)Most moods and actions are not voluntary because they are actually produced by the production of hormones in the body.(B)Because the effects of hormones are difficult to measure,scientists remain unsure how far-reaching theireffects on moods and actions are.(C)When the body is not producing enough hormones,urgent treatment may be necessary to avoid psychological damage.(D)The influence of many hormones is not easy to measure,but they can affect both people ’s psychology and actions extensively.35.The word tempered in the passage is closestin meaning to(A)decreased(B)advertised(C)prescribed(D)researched36.Which patients are usually treated with growth hormone?(A)Adults of smaller statue than normal(B)Adults with strong digestive systems(C)Children who are not at risk from the treatment(D)Children who may remain abnormally small37.Which of the following sentences explains the primary goal of hormone replacement therapy?These sentences are highlighted in the passage.(A)The quantities and proportions of hormones produced change with age,so scientists have given a great deal of studyto shifts in the endocrine system over time in the hopes of alleviating ailments associated with aging.(B)A combination of estrogen and progesterone has been prescribed for decades to women who want to reduce moodswings,sudden changes in body temperature,and other discomforts caused by lower natural levels of thosehormones as they enter middle age.(C)HRT may also increase the likelihood that bloodclots —dangerous because they could travel through the bloodstream and block major blood vessels—will form.(D)Because of the complicated effects growth hormonehas on the body,such treatments are generally restricted to children who would be pathologically small in stature without it.38.Look at the four squares that indicate where the following sentence could be added to the passage.The body isa complex machine,however,and recent studies have calledinto question the wisdom of essentially trying to fool its systems into believing they aren ’t aging.Where would the sentence best fit?Click on a square to add the sentence to the passage.39.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 belongin the summary because they express ideas that are not presented in the passage or are minor ideas in thepassage.This question is worth 2 points.The class of chemicals called hormones was discovered by two researchers studying a substance produced in the small intestine.Answer ChoicesThe term hormone is based on a Greek word that means"to excite"or"to set in motion."Researchers are looking for waysto decrease the dangers of treatments with growth hormone so that more patients can benefit from it.Hormones can be given artificially,but such treatments have risks and must be used carefully.Hormones can affect not only life processes such as growth but also behavior and emotion.Scientists have discovered that not only the nervous system but also certain chemicals can affect bodilyprocesses far from their points of origin.Hormonereplacement therapy(HRT)may increase the risk of bloodclots and heart disease in middle-age women.Answer KeysReading：27.B28.A29.D30.C31.D32.C33.B34.D35.A36.D37.A38.third square39.1)Scientists have discovered that not only the nervous system ⋯.2)Hormones can affect not only life processes⋯..3)Researchers are looking for ways to decrease the dangers of ⋯.。

2019年01月05日托福考试解析2019年01月05日托福考试解析阅读Passage 1- Costs and Benefits of Dispersal题号1-词汇题解析：Presumably，假设地= It is reasonable to assume. 有理由假设难度1 答案A题号2-修辞目的题解析：例子是为了具体解释前面的观点，前文讲为了move from one home base to another, 动物必须消耗calories（卡路里），不仅在move的过程中，也要为这个dispersal 长出肌肉。

也就是说动物迁移时需要cost（代价）的。

选B。

A说好处多于付出的代价，没提及。

C，只有足够健康的才disperse，没提及。

D，dispersal和肌肉生一样，需要能量，偏离重点。

难度2 答案B题号3-词汇题解析：Pertinent，相关的难度1 答案D题号4-事实信息题解析：雄松鼠travel 150 meter，雌的是只有50。

结合最后一句的问题，why should the males disperse farther than their sisters? 选C，他们移动的模式不一样难度2 答案C题号5-推断题解析：从本段最后两个问题可以推断出，动物dispersal的原因不是那么明显。

A，自然中很难观察到，事实上通过松鼠的例子，可知并非如此。

C，为了取得更好更多的资源，没提及。

D，对于大部分物种没有好处。

答案B题号6-句子简化题解析：句子原来意思：当近亲结合，他们的后代更可能得基因病；所以近亲结合（inbreeding）产生的后代更不可能挺过成年期而繁殖下一代。

选D。

A，以后as a result 后的重要信息。

B，从not related 的parents继承的基因病会导致后果，不对。

C，their offspring会挺过成年期，不对。

难度4 答案D题号7-事实信息题解析：Enjoy assistance from their mother,从母亲那里得到帮助。

If the physical barriers of the plant are breached, then preformed chemicals may inhibit or kill the intruder, and plant tissues contain a diverse array of toxic or potentially toxic substances, such as resins, tannins, glycosides, and alkaloids, many of which are highly effective deterrents to insects that feed on plants. The success of the Colorado beetle in infesting potatoes, for example,seems to be correlated with its high tolerance to alkaloids that normally repel potential pests. Other possible chemical defenses, while not directly toxic to the parasite, may inhibit some essential step in the establishment of a parasitic relationship. For example, glycoproteins in plant cell walls may inactivateenzymes that degrade cell walls. These enzymes are often produced by bacteria and fungi.

2019托福阅读：模拟试题及答案解析（1）2019托福阅读：模拟试题及答案解析（1）【托福】托福阅读原文Protection of Plants by Insects【1】Many plants - one or more species of at least68 different families - can secrete nectar even whenthey have no blossoms, because they bear extrafloral nectaries (structures that producenectar) on stems, leaves, leaf stems, or other structures.These plants usually occur where antsare abundant, most in the tropics but some in temperate areas. Among those of northeasternNorth America are various plums, cherries, roses, hawthorns, poplars, and oaks. Like floralnectar, extrafloral nectar consists mainly of water with a high content of dissolved sugars and, in some plants, small amounts of amino acids. The extrafloral nectaries of some plants areknown to attract ants and other insects, but the evolutionary history of most plants with thesenectaries is unknown. Nevertheless, most ecologists believe that all extrafloral nectaries attractinsects that will defend the plant.【2】Ants are portably the most frequent and certainly the most persistent defenders ofplants. Since the highly active worker ants require a great deal of energy, plants exploit thisneed by providing extrafloral nectar that supplies ants with abundant energy. To return thisfavor, ants guard the nectaries, driving away or killing intruding insects that might competewith ants for nectar. Many of theseintruders are herbivorous and would eat the leaves of theplants.【3】Biologists once thought that secretion ofextrafloral nectar has some purely internalphysiological function, and that ants provide no benefit whatsoever to the plants that secreteit. This view and the opposing “protectionist” hypothesis that ants defend plants had beendisputed for over a hundred years when, in 1910, a skeptical William Morton Wheelercommented on the controversy. He called for proof of the protectionist view：that visitations ofthe ants confer protection on the plants and that in the absence of the insects a much greaternumber would perish or fail to produce flowers or seeds than when the insects are present. That we now have an abundance of the proof that was called for was established whenBarbara Bentley reviewed the relevant evidence in 1977, and since then many moreobservations and experiments have provided still further proof that ants benefit plants.【4】One example shows how ants attracted to extrafloral nectaries protect morning gloriesagainst attacking insects. The principal insect enemies of the North American morning gloryfeed mainly on its flowers or fruits rather than its leaves. Grasshoppers feeding on flowersindirectly block pollination and the production of seeds by destroying the corolla or thestigma, which receives the pollen grains and on which the pollen germinates. Without theircolorful corolla, flowers do not attract pollinators and are not fertilized. An adult grasshoppercan consume a large corolla, about 2.5 inches long, in an hour. Caterpillars and seed beetlesaffect seed production directly. Caterpillars devour the ovaries,where the seeds are produced, and seed beetle larvae eat seeds as they burrow in developing fruits.【5】Extrafloral nectaries at the base of each sepal attractseveral kinds of insects, but 96 percent of them are ants, several different species of them. When buds are still small, lessthan a quarter of an inch long, the sepal nectaries are already present and producing nectar. They continue to do so as the flower develops and while the fruit matures. Observations leavelittle doubt that ants protect morning glory flowers and fruits from the combined enemy forceof grasshoppers, caterpillars, and seed beetles. Bentley compares the seed production of sixplants that grew where there were no ants with that of seventeen plants that were occupied byants. Unprotected plants bore only 45 seeds per plant, but plants occupied by ants bore 211 seeds per plant. Although ants are not big enough to kill or seriously injure grasshoppers, theydrive them away by nipping at their feet. Seed beetles are more vulnerable because they aremuch smaller than grasshoppers. The ants prey on the adult beetles,disturb females astheylay their eggs on developing fruits, and eat many of the eggs they do manage to lay.托福阅读试题1.According to paragraph 1，floral nectar andextrafloral nectar are alike in thatA.they are likely to be produced by the same plants.B.they basically consist of the same chemicalcomponents.C.they attract only insects that will defend the plant.D.they are produced by the same parts of the plant.2.To say that ants are "persistent" defenders of plants means thatA.they defend plants against a wide variety of threats.B.they continue to defend plants for as long as the plants are threatened.C.they are successful defenders of plants.D.they are easily observable defenders of plants.3.What can be inferred from paragraph 2 about the ants that are attracted to theextrafloral nectaries?A.They do not eat the leaves of the plants that produce extrafloral nectar.B.They live almost entirely on extrafloral nectar.C.They spend most of their energy guarding extrafloral nectaries.D.They frequently fight among themselves overextrafloral nectar.4.According to paragraph 3, what was the position of the opponents of the"protectionist" hypothesis?A.Extrafloral nectar provides plants with a direct defense against attack by insects.B.Ants substantially benefit plants that secrete extrafloral nectar.C.The secretion of extrafloral nectar plays a role in the plant’s internal functioning.D.Ants visit plants that secrete extrafloral nectar as often as they visit plants that do not.5.The word "skeptical" in the passage is closest in meaning toA.curious.B.doubtful.C.open-minded.D.practical.6.Which of the sentences below best expresses the essential information jn thehighlighted sentence in the passage Incorrect choices change the meaning inimportant ways or leave out essential information.A.We now have ample proof that ants benefit plants.B.Barbara Bentley has called for additional proof that ants benefit plants.C.In 1977 Barbara Bentley conducted research that proved that all prior studies were wrong.D.Proof that ants benefit plants will require many more observations and experiments.7.According to paragraph 4, what effect does the destruction of the corolla have onplants.A.It leaves the seeds exposed and unprotected.B.It prevents the stigma from developing.C.It keeps pollen grains from attaching properly.D.It prevents the flower from attracting pollinators.8.The word "devour" in the passage is closest in meaning toA.attack.B.eat.C.damage.D.prefer.9.What role does paragraph 5 play in the passage?A.It offers various kinds of evidence for the protectionist view.B.It presents the study that first proved that ants benefit plants.C.It explains how insects find sources of nectar.D.It presents information that partly contradicts the protectionist view.10.The word "vulnerable" in the passage is closest in meaning toA.numerous.B.harmful.C.open to attack.D.difficult to locate.11.According to paragraph 5, what did Bentley’s comparative study show?A.Many more plants grew in places where ants werepresent than where they were absent.B.The ants preferred plants with low seed production to plants with high seed production.C.The plants occupied by ants produced many more seeds than those that were not occupiedby ants.D.The plants that grew in places without ants were much smaller and weaker than those thatgrew in places where ants were present.12.According to paragraph 5, ants defend morning glory plants from seed beetles ineach of the following ways EXCEPT：A.driving adult beetles off the plants by nipping attheir feet.B.catching and eating adult beetles.C.eating beetle eggs they find on developing fruits.D.making it difficult for beetles to lay eggs on developing fruits.13. Look at the four squares [■] that indicate wherethe following sentence could beadded to the passage. Where would the sentence best fit? Sometimes they capture theinsects to feed their protein-hungry larvae.Ants are portably the most frequent and certainly the most persistent defenders of plants. ■【A】 Since the highly active worker ants require a great deal of energy, plants exploit thisneed by providing extrafloral nectar thatsupplies ants with abundant energy. ■【B】T oreturn this favor, ants guard the nectaries, driving away or killing intrudinginsects that mightcompete with ants for nectar. ■【C】 Many of these intruders are herbivorous and wouldeatthe leaves of the plants. ■【D】14. Directions：An introductory sentence for a brief summary of the passage of thepassage is provided below. Complete the summary by selecting the THREE answerchoices that express the most important ideas in the passage. Some answer choicesdo not belong in the summary because they express ideas that are not presented inthe passage or are minor ideas in the passage. This questions is worth 2 points.Many plants have extrafloral nectaries that produce nectar even during periods inwhich the plant is not flowering.A.Evolutionary history shows that plants that produce extrafloral nectar originated in thetropics.B.Extrafloral nectar has a higher concentration of sugar than floral nectar and is moreattractive to ants and other insects.C.The protectionist hypothesis is that extrafloralnextar attracts ants, and that the ants, inorder to preserve this energy-rich food source, attack insects that might harm the plant.D.Evidence accumulated during the twentieth century proved that ants provide significantbenefits for plants with extrafloral nectaries.E.Research has shown that American morning glory plants that are protected by ants producesignificantly more seeds than morning glory plants that are not protected by ants.F.Ants generally ignore small insects, but they will eat the adults of large insect species aswell as their eggs and larvae.托福阅读答案1.B2.B3.A4.D5.A6.A7.C8.B9.B10.C11.C12.A13.C14.CDE。

2019年托福阅读真题解析：鸟类配偶选择今天阅读三篇文章是Reconstructing Prehistoric Human Lifestyle(重建史前人类的生活方式)，How Soil is Formed(泥土如何形成)和Mate Choice In Birds(鸟类配偶选择)。

分别重复2015.09.17第一篇，2014.07.12第二篇，和2015.10.24第三篇，是典型的老题拼盘重复。

三篇文章，集合了人类考古、地质和生物学三个常见话题，专业词汇泛滥，长难句增多，篇章结构的整体性增强。

下面，给出今天第三篇文章的知识框架和词汇串讲。

第三篇 Mate Choice In Birds(鸟类配偶选择)第1段：与雌鸟相比，雄鸟在羽毛(plumage)和体型上彼此差别很大(引出话题)。

达尔文认为这是雄鸟针对雌鸟的配偶竞争(mate competition)导致的。

伴随着繁殖成功，这些导致繁殖成功的特定性状(specific traits)也流传于后代，如硕大体型、花哨俏丽的羽毛(fancy plumage)、复杂婉转的歌声(intricate songs)和惊艳的表演(striking displays)。

虽然达尔文对于雄鸟配偶竞争的理论被认可，但现实中雄鸟的竞争，雌鸟对于雄鸟的选择，以及配偶之外的资源竞争以更加错综复杂的关系相连。

第2段：配偶对象之间的相互评估(mutual assessment)对求偶成功起着重要作用。

雄性的装饰炫耀(the ornaments and displays)能够表明它所处的优越状态，进而吸引雌性选择自己作为伴侣。

雌性钟爱能够长时间表演的雄性，这说明它们有更多的脂肪储备，所以有水平和自己产下更多的后代(descendant/offspring)。

第3段：为什么雌性会选择羽毛鲜艳和长时间表演的雄性?科学家提出优秀基因假说(good-genes hypotheses)解释这个现象。