大学英语四级模拟试题(九)

1、大学英语四级模拟试题（9）directions:there are four reading passages in this part. each passage isfollowed by some questions. for each question there are four suggested answers marked a, b, c and d. you should choose the one best answer and blacken the corresponding letter on the answer sheet with a pencil.passa

2、ge 1how do you send a message to a submerged submarine, particularly one carrying mi water may not look like a barrier to communications, but appearances are deceiving. water strongly absorbs all electromagnetic waves except blue green light and extremely low frequency radio waves. the very low freq

3、uency waves now used to contract submarines penetrates only a short distance into the ocean, so the craft must either surface or send up and antenna （天线）to receive messages, thereby increasing its weakness. a laser system -accurate over long distances and capable of carrying more data than the very

4、low frequency waves - would talk to submarine at their normal depths.in the system, a very broad beam spreading out freely in all directions would be scanned（扫描）over thousands of square miles of ocean so that it wouldn'tendanger boats, birds or fish or the submarines it is supposed to reach.sinc

5、e only a small fraction of the laser system will make its way through the air and ocean, receivers mounted on the submarines must be able not only to detect the laser but also to discriminate between it and sunlight. so, military scientists are now working hard on special filter that allow through o

6、nly the precise wavelengths emitted by the laser. the filtered light, when transformedinto electrical signal, can then be decoded. military planners are confident that laser communication with submarines is feasible.1. which of the following does the passage mainly discuss?a. missiles carried by sub

7、merged submarines.b. messages sent by submerged submarines.c. blue-green lasers used by submerged submarines.d. the way to send a message to submerged submarines.2. which of the following is true according to the passage?a. water is a barrier to radio communication.b. lasers have found wide applicat

8、ion in submarine communication.c. water absorbs all kinds of electromagnetic waves.d. very low frequency radio waves cannot be used to contact submarines.3. which of the following is not true of a laser system?a. it is able to make its way through water.b. it is able to communicate with submarines a

9、t work.c. its beam reaches a submerged submarine with the help of an antenna.d. it is able to carry more data than low frequency waves.4. the reference word“ it ” (sentence 1, para.3) refers to .a. the airb. the laser beamc. the oceand. the submarine5. who would be very much interested in the passag

10、e?a. missile buildersb. military scientistsc. fishermend. ship builderpassage 2the west begun to take more notice of the east. the fifth volume of an enormous work re-assessing the chinese contribution to science and technology is to be published next year. the first volume, which was publishedtwent

11、y years ago, set the tone for the whole work. in it, evidence was given to show that many inventions which, until then, western historians had claimed for europe, were made first in china. the attempt to rewrite the intellectual history of the world was not received without protest by some reputable

12、 historians. however , the evidence that has been presented so far in the first four volumes has persuaded many historians who were skeptical at first. china's invention of paper , printing, the magnetic compass and gunpowder has never been disputed, but this new history has added advanced bridg

13、e design, mechanical clocks, paddle boats and many other inventions to the list.in the four volumes published so far no attempt has been made to explain why china has not kept up with the west in science and technology in modern times. it is probable that the answer is to be found in the social and

14、economic history of china, where a static society under a relatively benevolent regime of scholar-gentry contrasts with the potentially revolutionary and dynamic society of the west at the end of the middle ages. in recent years, the chinese. but will chinagovernment has been making every effort to

15、catch up with the west again, and there is little doubt that the gap is being reduced year by yearavoid the west's mistakes?6. so far , how many volumes have been published?a. five.b. four .c. three.d. none.7. the first volume was published .a. ten years agob. last yearc. five years agod. twenty

16、 years ago8. in line 7, the word“ skeptical" means .a. doubtfulb. worriedc. sadd. angry9. which of the following is not mentioned in the passage?a. gunpowder .b. needle.c. paddle boats.d. bridge design.10. the best title for this passage is .a. china's inventionsb. comparisons between the e

17、ast and the westc. china is catching upd. situations in chinapassage 3within fifteen years britain and other nations should be well on with the building of huge industrial complexes for the recycling of waste. the word rubbish could lose its meaning because everything which goes into the dustbin wou

18、ld be made into something useful. even the most dangerous and unpleasant wastes would provide energy if nothing else.the new concept of recycling waste is taking shape at the british technological laboratory at warren spring, not far from the north of london. today, the laboratory spends four times

19、as much money in studying recycling as it did five years ago.the latest project is to take a city of around half a million inhabitants and discover exactly what raw materials go into it and what go out. the aim is to find out how much of these raw materials could be provided if a plant for recycling

20、 waste were built just outside the city. this plant would recycle not only metal such as steel, lead and copper , but also paper and rubber as well. methods have been discovered, for example, for removing the ink from newsprint so that the paper can be used again, and for obtaining valuable oils and

21、 gases from old motor car types. all these ideas are already being made use of, but what is new is the idea of combining them on such a large scale in a single plant designed to recycle most types of waste.another new project is being set up to discover the best ways of sorting and separating the ru

22、bbish. when this project is complete, the rubbish will be processed like this: first, it will pass through sharp metal spikes which will tear open the plastic bags in which rubbish is usually packed; then it will pass through a powerful fan to separate the lightest elements from the heavy solids; af

23、ter that crushers and rollers will break up everything that can be broken finally, and the rubbish will pass under magnets, which will remove the bits of iron and steel; finely the rubber and plastic will then be sorted out in the final stage.the first full-scale giant recycling plants are, perhaps,

24、 fifteenyears away. but insome big industrial areas, where rubbish hasbeen dumped forsolongthatthere are no holes left to fill up with rubbish, these new automatic recycling plants may be built sooner . indeed, with thegrowing costoftransportingrubbish to more distant dumps, some big cities will be

25、forcedto build their ownrecycling plants before long.11. projects for recycling waste in britain .a. will not be started for at least fifteen yearsb. are being developed all over britainc. have not yet been fully testedd. have been abandoned because they are too expensive12. the purpose of the lates

26、t recycling project isa. to prevent people from putting rubbish into holesb. to find a way of destroying all kinds of wastec. to extract useful raw materials from the wasted. to find out how much raw materials should be provided of people want to recycle the waste13. the new type of recycling plant

27、will .a. recycle only paper and rubberb. not recycle metals, paper or rubberc. recycle paper , rubber and metalsd. not recycle steel, lead or copper14. the first recycling plants .a. have already been built in large industrial areasb. will not be built for at least fifteen yearsc. will probably be b

28、uilt in the next fifteen yearsd. will be too expensive to build near big cities.15. “ well on with" in the first paragraph probably means.a. finished withb. nearing completionc. getting ready to startd. making improvements onpassage 4people with disabilities comprise a large part of the populat

29、ion. it is estimatedthat over 35 million americanshave physical, mental, or other disabilities.about half of these disabilities are“ developmental", i.e., they occur prior to theindividual's twenty-second birthday, often from genetic conditions, and are severe enough to affect three or more

30、 areas of development, such as mobility, communication, employment, etc. most other disabilities are considered “ adventitious", i.e., accidental or caused by outside forces.prior to the 20th century, only a small percentage of people with disabilities survived for long. medical treatment for t

31、hese disabilities was unavailable. advancements in medicine and social services have created a climate in whichpeople with disabilities can expect to have such basic needs as food, shelter, andmedical treatment. unfortunately, these basics are often not available. civil liberties such as the right t

32、o vote, marry, get an education, and gain employment have historically been denied on the basis of disability.in recent decades, the disability rights movement has been organized to fightagainst these infringements of civil rights. congress responded by passing major legislation recognizing people w

33、ith disabilities as a protected class under civil rights statutes.still today, people with disabilities must fight to live their lives independently. itis estimated that more than half of qualified americans with disabilities are unemployed, and a majority of those who do work are underemployed. abo

34、ut two-thirds live at or below the official poverty level.significant barriers, especially in transportation and public awareness, preventdisabled people from taking part in society. for example, while no longer prohibited by law from marrying, a person with no access to transportation is effectivel

35、y excluded from community and social activities which might lead to the development of long-term relationships.it will only be when public attitudes advance as far as laws have that disabled people will be fully able to take their rightful place in society.16. a “ developmental" disability .a.

36、develops very slowly over timeb. is caused forcesc. occurs in youth and affects developmentd. is getting more and more severe17. most disabled people used to die early because .a. disabilities destroyed major bodily functionsb. they were not very well looked afterc. medical techniques were not avail

37、abled. they were too poor to get proper treatment18. in the author's opinion, to enable the disabled people to take their rightful place in society.a. more laws should be passedb. public attitudes should be changedc. government should provide more aidsd. more public facilities should be set up19

38、. which of the following cannot be inferred from the passage ?a. many disabled people may remain single for their whole life.b. the public tends to look down upon the disabled people.c. the disabled people feel inferior to those surrounding them.d. discriminatory laws prevent the disabled from mixin

39、g with others.20. the best title for this passage might be .a. handicaps of people with disabilitiesb. the difficulties of the disabledc. the causes for disabilitiesd. medical treatments for disabilitiespart iii vocabulary and structure (20 minutes)directions: there are 30 incomplete sentences in th

40、is part. for each sentence there are four choices marked a., b., c. and d. choose the one answer that best completes the sentence. then mark the corresponding letter on the answer sheet with a single line through the centre.21. the guard walked through the train everyone's ticket.a. inspectingb.

41、 overlookingc. reviewingd. conducting22. it is quite natural that the customs of all national minorities .a. would be respectedb. were respectedc. be respectedd. had been respected23. i slipped on the stairs and fell down, breaking my leg.a. sob. thusc. henced. therefore24. he tried to read but the

42、words on the page made no for him.a. messageb. explanationc. sensed. impression25. they lost their way in the forest, and made matters worse was that night began to fall.a. itb. whichc. whatd. that26. since there were five different of the accident, it was difficult to know what really happened.a. o

43、utcomesb. interpretationsc. quotationsd. paragraphs27. craig assured his boss that he would all his energies in doing the new job.a. call atb. call onc. call offd. call forth28. the world's governments have done nothing to combat the threat of nuclear accidents.a. incidentallyb. vitallyc. virtua

44、llyd. identically29. the people who objected to the new approach were told that since work had already started there was no point in .a. denyingb. upsettingc. protestingd. competing30. he just couldn't what in the world she had been talking about all the time.a. figure outb. catch onc. set outd.

45、 work on31. second thoughts i've decided against buying a new tape recorder.a. onb. withc. atd. but32. scientists say it may be five or ten years it is possible to test this medicine on human patients.a. sinceb. beforec. afterd. when33. the police will discover the truth sooner or later, whether

46、 you try to the factor not.a. cut backb. set backc. keep backd. look back34. nothing to talk about, the head said good-bye and went out of the room.a. there wasb. beingc. as there beingd. there being35. johnson offered a reward to would find the lost ring for his wife.a. whob. whomc. whoeverd. whomever36. this is the reason i came here.a. thatb. whatc. for whichd. of which37. in the past men generally preferred that their wives at home.a. workedb. would workc. workd. to work38. mistakes carelessne