2019 年 12 月大学英语四级考试模拟试卷及答案(21)PartⅡ Reading Comprehension (35 minutes)Directions ： There are 4 passages in this part.Eachpassage is followed by some questions or unfinishedstatements.For each of them there are four choices markedA),B),C) and D).You should decide on the best choice and markthe corresponding letter on the Answer Sheet with a single linethrough the center.Questions 21 to 25 are based on the following passage：Some radio singals were heard in 1967.They were comingfrom a point in the sky where there was unknown star.Theywere coming very regularly,too ：about once a second,if theywere controlled by clock.The scientists who heard the signals did not tellanybody else.They were rather afraid to tell in case theyfrightened people.The signals were coming from a very smallbody—no bigger,perhaps than the earth.Was that why no lightcould be seen from it?Or were the signals coming from aplanet that belonged to some other star?There was no end tothe questions,but the scientists kept the newssecret. “Perhaps there are intelligent beings outthere. ”they thought, “who are trying to send messages toother planets,or to us?So the news was not given to thenewspaper.Instead,the scientists studied the signals andsearched for others like them...Well,all that happened in1967 and 1968.Since then scientists have learnt more aboutthose strange,regular,radio signals.And they have toldthe story,of course.The signals do not come from a planet;they come from anew kind of star called a “pulsar ”” .About a hundred other pulsars have now been found,and most of them are very like the first one.Pulsars are strong radio stars.They are the smallest butthe heaviest stars we know at present.A handful of pulsarwould weigh a few thousand tons.Their light —if they give muchlight —is too small for us to see.But we can be sure of this,no intelligent beings are living on them.21.The radio signals discussed in this passage____.A.were regularB.were controlled by a clock答案1短文大意1967 年人收到了一些太空信号。

些信号来自太空中的某一恒星域，它极有律，道是外星人向地球或我收的信号 ? 了不致在人当中造成恐慌，科学家一直保守着个秘密，并且一直它行研究。

如今，当然一切都真相大白。

原来些信号都来自一种叫脉冲星的恒星，它的密度极大光也以逃逸。

但有一点能确定，上面没有智能生命存有。

21.答案 A。

【参考文】文中到的磁信号⋯⋯【分析】此考考生“辨事”的水平。

【解答】原文第一段，“ They were coming veryregularly,too. ”他同非常有律，与 A) 同意。

B)werecontrolled by a clock.由控制，原文前面有一表示“似乎的”if。

C)，D)根据下文判断都不准确。

22.答案 C。

【参考文】些磁信号来自于⋯⋯【分析】此考考生“根据已知信息行推断”的水平。

【解答】原文第三段“ ...they come from a new kind of star called a“pulsar””他来自一种叫脉冲星的新型恒星。

A) a satellite星，B)a planet行星，D)当未知的智能生命。

23.答案 C。

【参考文】科学家没有把相关磁信号的事情告人是因⋯⋯【分析】此考考生“理解文章中某些”的水平。

ぁ鞠晗附獯稹原文第二段开“The scientists who heardanybody else.They were ratherthe singals did not tellafraid to tell in case they frightened people. ”听到信号的科学家未告人，他害怕会惊吓了老百姓。

所以C。

24.答案 A。

【参考文】脉冲星是⋯⋯【分析】此考考生“辨事”的水平。

【解答】原文第四段，由“star ” 个就可排除B)，C)和 D)。

25.答案 D。

【参考文】以下法，哪一个是准确的?【分析】此考考生“根据已知信息行推理”的水平。

【解答】原文第三段最后一句“About a hundred otherpulsars have now been found... ”所以 D)准确，其他各均与原文意思不符。

2短文大意本文主要的是沙漠的。

人以生存的降雨及植被在持减少，地球上40%的土地已成了沙漠或已沙漠化，1/7 的人口生活在干旱地区，以及代生活造成的一些使人生存日益受到沙漠的威。

然科学家未能底了解沙漠，但是一些保土地的措施已被采用，人在与沙漠抗争。

26.答案 A。

【参考文】本文主要的是什么?【分析】此考考生“把握文章主旨及大意”的水平。

【解答】全文主要述了沙漠散来的水源缺乏的，以及人采取的措施。

A) 符合中心思想 ;B) ，C)和 D)在文中提到但作主要思想，于片面。

27.答案 C。

【参考文】 1/7指的是⋯⋯【分析】此考考生“理解文章中某些”的水平。

【解答】原文第一段第三句“About 628 millionpeople -one out of seven-live in these dry regions.”大628，000，000( 1/7) 的人住在些干旱地区。

C)符合所指代的内容，准确答案。

28.答案 C。

【参考文】在第二段中，“他被送往南方的草地”，他指的是⋯⋯【分析】此考考生“理解文章中某些”的水平。

【解答】原文最后一句“Some Sahel fa rmers still raise cattle on their poor farm land,but before the cattleare sold,they are taken to greener lands in the south to get fat ”一些 Sahel 民在他瘠的上仍然养着牛群，但在把他出之前，往往要送到南方多草的土地上以增肥。

they 指代前面的 the cattle 。

所以 C准确。

29.答案 D。

【参考文】文中描述了几种保土地的意?【分析】此考考生“根据已知信息行推断”的水平。

【解答】原文第二段“ ...but there have been manyideas for saving the land. ”但已有了很多保土地的意。

以下各句即例，确定其数目 3 ，所以 D准确。

30.答案 A。

【参考文】根据短文，以下法，哪个是准确的?【分析】此考考生“辨事”的水平。

【解答】原文第一段最后一句“Now largely through problems caused by modern life,their existence is threatenedby the slow,steady spread of the earth's deserts.” 在因代生活生的一些，他生存日益受到地球沙漠逐步慢散的威胁。

所以 A 为准确选择。

B)中准确数目应为o ne out of seven,C)应是modern problems ，D)文中未提及。

C.were heard in 1967 onlyD.were secret messages22.The radio singals were sent by____.A.a satelliteB.a planetC.a sky body which was unknown at that timeD.intelligent beings who were unknown at that time23.The scientists did not tell people about thesignals because____.A.the singals stood for secret messagesB.people would ask them too many questionsC.they did not want to frighten peopleD.they stood for unimportant messages24. A pulsar is____.A. a small heavy star which sends out strongradio signals and cannot be seenB. a small heavy planet which sends out strongradio signals and cannot be seenC. a small heavy satellite which sends out strongradio signals and cannot be seenD. a small intelligent being who sends out strongradio signals and cannot be seen25. Which of the following is true?A.One of the pulsars found by scientists sendsradio signals.B.Pulsar began to send radio singals in 1967.C.Scientists have searched for pulsars for manyyears but found none.D.Scientists have found many pulsars since 1967.Questions 26 to 30 are based on the following passage：Over vast areas of every continent,the rainfall andvegetation necessary for life are disappearing.Already morethan 40 percent of the earth's land is desert or desert 瞝ike.About 628 million people —one out of seven —live in these dry regions.In the past,they have managed to survive,but withdifficulty.[ZZ(Z]Now largely through problems caused bymodern life,their existence is threatened by the slow,steadyspread of the earth's deserts.Scientists still do not understand all the complexproblems of the desert,but there have been many ideasfor saving the land.Sandi Arabia has planted 10 milliontrees to help keep the sand from taking over fertile areas.TheIsraelis are aga in using some of the water collectionsystems left by the ancient people in theNegev desert.They plan to water their orchards with theextra water.Some Sahel farmers still raise cattle on theirpoor farm land,but before the cattle are sold, they are taken togreener lands in the south to get fat.26. What is the article mainly concerned?A.The problem of spreading desert.B.The rainfall and vegetation in desert areas.C.The water collection systems.D.The difference between modern life and ancient life.27.“one out of seven” refers to____.A.more than a third of the lands' earthB.the percentage of the earth's land that is desert-likeC.the number of people who live in dry regionsD.a day of a week28.In paragraph 2, “they are taken to the greener lands in the south. ”Theyrefers to____.29.How many ideas for saving the land are described?A.Five.B.Two.C.Four.D.Three.30.Which of the following statements is true, accordingto the passage?A.The earth's desert are slowly spreading.B.One out of 10 people lives in dry regions.C.Their life in the desert is threatened now by traditional problems.D.New water wells can solve the problem in Africa's desert.。