第二篇     A Thirsty World
　 　The world is not only hungry，it is also thirsty for water．This may seem strange to you，since nearly 75％of the earth's surface is covered with water．But about 97％of this huge amount is sea-water，or salt water．Man can only drink and use the other 3％-the flesh water that comes from rivers，lakes，underground，and other sources． And we cannot even use all of that，because some of it is in the form of icebergs(冰山)and glaciers(冰川)．Even worse，some of it has been polluted．
　 　At the moment，this small amount of fresh water is still enough for us．However,our need for water is increasing rapidly．Only if we take steps to deal with this problem now can we avoid a severe worldwide water shortage later on．A limited water supply would have a bad effect on agriculture and industry．
　　In addition to stopping wasting our precious water,one useful step we should take is to develop ways of reusing it．Experiments have already been done in this field，but only on a small scale.
　　Today,in most large cities，water is used only once and it eventually returns to the sea or runs into underground storage tanks．But it is possible to pipe water that has been used to a purifying(净化)plant．There it can be filtered(过滤)and treated with chemicals so that it can be used againjust as if it were flesh from a spring．
　　But even if every large city purified and reused its water,we still would not have enough.Where could we turn next?To the oceans!A11 we'd have to do to make use of the vast amount of
　　sea-water is-remove the salt．This salt-removing process is already m use in many parts of the world．
　　So if we take all these steps，we'll be in no danger of drying up !
　　36 The phrase''the world"in the first line of the passage refers to
　　A  "man"．
　　B  "you"．
　　C  "woman".
　　D  "they"．
　　37 What percentage of the earth's water can man actually use at present?
　　A  Nearly 75 percent．
　　B  About 97 percent．
　　C  Exactly 3 percent．
　　D  Less than 3 percent．
　　38 According to the passage，we can avoid a worldwide water shortage in the furore by
　　A  increasing  rainfall．
　　B  reusing water and utilizing sea-water．
　　C  cutting down our consumption of water．
　　D  reducing the number of factories producing steel．
　　39 Which of the following statements，according to the passage，is NOT true?
　　A  A limited water supply will affect industrial production．
　　B  Every large city purifies and reuses its water．
　　C  Purified water is not exactly as flesh as spring water．
　　D  Oceans are the largest water source．
　　40 According to the passage，sea-water can be tureed into flesh water by
　　A heating it up．
　　B treating it with chemicals．
　　C taking salt out of it．
　　D drying it up．
　　第三篇 Computers in Cars
　 　You're far from home on a lonely road.Shadowy forests stretch away on both sides.Athick mist(雾)makes it difficult to see far beyond your car's windshield (挡风玻璃).
　　"Can this be route 90A?"you wonder.If it is ,you should be near a town.Yet there's no hint of one. Night is closing in.And you're low on gasoline.
　　This is a situation where an in -car computer that can navigate would be a big help.
　 　A car computer that navigates?Yes!Such computers exist . Several experimental models are being tested by General Motors,Ford,Chrysler,and several foreign car makers.These computers vary in detail. But they all contain series of maps on videodiscs or videotapes.For example,one computer system contains 13,300 maps covering the continental US.
　　Before starting out on a trip,a driver can type in the code for the region he or she plans to drive through.The computer then shows a map of theat region.At the same time,a tiny radio receiver linked to the computer goes to work. It picks up signals from navigation satellites such as the NAVSTAR network.Using these signals,the computer shows the car's position at all times and displays this position on the map.The computer can dalso calculate and display the best route to follow.
　　A navigation computer may also receive and use data about road construction, weather conditions,and traffic jams.This information would be displayed to the driver and the computer would also use the information to work out alternate(交替的)routes.
　　Most cars nowadays also contain computers that help cars run more efficiently. Microprocessors(微处理机)control certain engine functions by regulating the mixing of fuel.Data on car speed,oil pressure,revolutions per minute,enginete mperature , and fuel level can be displayed as digital data (numbers) or warning lights.
　 　Some auto designers suggest that a central computer display be used to clearly present such timely information as car speed and fuel level.Warning lights would indicate a drop in oil pressure or a sudden rise in engine temperature.To get more information on these conditions,the driver could call it up on the computer display screen.When needed,the computer could be "asked"to provide navigation aid or information about the car's condition.
　　41 By describing a typical situation of a lost driver on the road,the arthor intends to
　　A make us believe how complex the highway computer network is.
　　B let us know how in-car computers are linked to road signs.
　　C show us how helpful a navigation computer can be.
　　D tell us that NAVSTAR has come into use.
　　42 The word "navigate"in Paragraph 3 meadns
　　A "help one comtrol the traffic".
　　B "help one find one's way".
　　C "give a ship correct information about its course".
　　D "direct a plande to its destination."
　　43 The dnavigation computers have one thing in common:they all
　　A contain series of maps on videodisce or videotapes.
　　B contain 13,300 maps covering the continentalUS.
　　C can be obtained free of charge.
　　D cost a lot of money.
　　44 Without signals from navigation satellites,the in-car computer
　　A would still be able to locate the car's position at all times.
　　B would fail to locate the car's position.
C could still work out the best route to follow.
　　D would seek help from the radio receiver linked to it .
　　45 Of the following functions,which is NOT possessed by the navigation computer?
　　A Showing a map of the region a driver plans to drive through.
　　B Predicting a car crash on the road.
　　C Getting information about road construction,weather conditions,and traffic jams.
　　D Showing the car's position at all times and displaying it on the map.
　　第5部分：补全短文（第46~50题，每题2分，共10分）
　　阅读下面的短文，文章中有5处空白，文章后面有6组文字，请根据文章的内容选择5组文字，将其分别放回文章原有位置，以恢复文章原貌。请将答案涂在答题卡相应的位置
　　上。
　　Home Schooling
　 　All children in the United States have to receive an education，but the law does not say they have．to be educated at schoo1．A number of parents prefer not to send their children to schoo1．      (46)There are about 300，000 home-schoolers in the United States today．Some parents prefer teaching their children at home because they do not believe that public schools teach the correct religious values；others believe they call provide a better educational experience fortheir children by teaching them at home．         (47)
　　David Guterson and his wife teach their three children at home．Guterson says that his children leam very differently from children in schoo1．       (48)For example，when there is heavy snowfall on a winter day,it may start a discussion or reading about climate，snow removal(去除)equipment，Alaska，polai bears(北极熊)，and winter tourism．A spring evening when the family is out watching the stars is a good time to ask questions about satellites and the space program        (49)
　　Home schooling is often more interesting than regular schools，but critics say that home-schoolers are outsiders who might be uncomfortable mixing with other people in adult life．      (50)However,most parents don't have the time or the desire to teach their children at home，so schools will continue to be where most children get their formal education.
　　A  Interestingly,results show that home-schooled children quite often do better than average on national tests in reading and math.
　　B  Critics also say that most parents are not well qualified to teach their children．
　　C  Learning starts with the children's interests and questions.
　　D  Children who are educated at home are known as"home．schoolers．"
　　E  In some countries，however,children are educated by their parents.
　 　F  If the Brazilian rain forests are on the TV news．it could be a perfect time to talk about how rain forests influence the climate，and how deserts are formed．
　　第6部分：完形填空  (第5l~65题，每题1分，共15分)
　　阅读下面的短文，文中有15处空白，每处空白给出4个选项，请根据短文的内容从4个选项中选择1个最佳答案，涂在答题卡相应的位置上。
　　The Development of Rubber
　 　Here is the story of rubber.From the earliest time it was common knowledge      (51) the Peruvians that when a cut was made in the outside skin of a rubber tree , a white dliquid       (52) milk came out ,and that        (53) this a sticky(粘的)mass of rubber might be made .This rubber is soft when warm,so that it is possible to give it any        (54).The Peruvians made the      (55) that it was very good for keeping out the wet. Then in the early 1800's ,the Americans made use of it for the first time .First they made overshoes to            (56) their feet dry.Then came a certain Mr.Mackintosh,who made coats of cloth covered with natural rubber.From that day to this we have been coating cloth with rubber as Mr. Mackintosh     (57),and our raincoats are still named after him.
　　But these first rubber overshoes and raincoats were all soft and sticky in summer,and     (58)and inelastic(无弹性的)in the winter when it was cold.But the rubber we have today is soft and elastic(有弹性的),      (59)very strong-even in the warmest summer and the coldest winter.This was made           (60)by a man called Goodyear.After many       (61),he found that nitric acid(销酸)made the rubber much better,but it is not hard and strong enough.Then a strange thing took      (62).A friend of his ,Nicholas Hayward,had the idea in his sleep that rubber might be made hard and strong if mixed with sulphur(硫磺)and put in the sun.Goodyear put this idea      (63)the test,and saw that it did have more or less the desired effect- though somewhat less than more. The only effect it had was on the outside of the drubber.It is common knowledge now that                                               the      (64)to make rubber hard and strong is by heating dit with sulphur.It took Goodyear four more years to find this method.When at last he did it,he had     (65)at all .Everything of the smallest value had been used to get money,even his sons'school-books.
　　51 A for      B to    C about    D with
　　52A like     B alike     C resembled    D similar
　　53A on      B from     C up    D in
　　54 A use      B heat     C pressure    D from
　　55 A creation  B invention   C discovery  D recognition
　　56 A retain      B keep     C hold   D set
　　57 A did      B built     C tried   D conducted
　　58 A weak      B gentle    C hard     D strong
　　59 A or      B however     C though    D even
　　60 A capable      B probable   C practical    D possible
　　61 A experiments      B checks   C discoveries  D works
　　62 A form      B place     C shape    D size
　　63 A on    B to       C in    D with
　　64 A system      B style   C way   D direction
　　65 A everything    B anything   C nothing    D something