[外语类试卷]大学英语六级模拟试卷833及答案与解析.doc

1、大学英语六级模拟试卷 833及答案与解析 一、 Part I Writing (30 minutes) 1 For this part, you are allowed 30 minutes to write a short essay entitled The Importance of Information Security. You should write at least 150 words following the outline given below. 1很多人认为信息安全很 重要 2有的人认为信息不是实物，所以信息安全无关紧要 3我认为 The Importance of

2、 Information Security 二、 Part II Reading Comprehension (Skimming and Scanning) (15 minutes) Directions: In this part, you will have 15 minutes to go over the passage quickly and answer the questions attached to the passage. For questions 1-4, mark： Y (for YES) if the statement agrees with the inform

3、ation given in the passage; N (for NO) if the statement contradicts the information given in the passage; NG (for NOT GIVEN) if the information is not given in the passage. 1 Think or Swim: Can We Hold Back the Oceans? As the world gets warmer, sea levels are rising. It has been happening at a snail

4、s pace so far, but as it speeds up more and more low-lying coastal land will be lost. At risk are many of the worlds cities and huge areas of fertile farmland. The sea is set to rise a metre or more by the end of this century. And thats just the start. “Unless there is a rapid and dramatic about-fac

5、e in emissions which no one expects the next century will be far worse than this century,“ says glaciologist(冰川学家 )Bob Bindshadler of NASAs Goddard Space Flight Center, Maryland. Throwing trillions of dollars at the problem could probably save big cities such as New York and London, but the task of

6、defending all low-lying coastal areas and islands seems hopeless. Or is it? Could we find a way to slow the accelerating glaciers, drain seas into deserts or add more ice to the great ice caps of Greenland and Antarctica? These ideas might sound crazy but we have got ourselves into such a bad situat

7、ion that maybe we should start to consider them. If we carry on as we are, sea levels will rise for millennia, probably by well over 10 metres. Slashing greenhouse gas emissions would slow the rise, but the longer we hesitate, the bigger the rise we will be committed to. Even if “conventional“ geo-e

8、ngineering schemes for cooling the planet were put in place and worked as planned, they would have little effect on sea level over the next century unless combined with drastic emissions cuts. In short, if coastal dwellers dont want their children and grandchildren to have to abandon land to the sea

9、, now is the time to start coming up with Plan C. So New Scientist set out in search of the handful of researchers who have begun to think about specific ways to hold back the waters. One of the reasons why the great ice sheets of Greenland and Antartica are already shrinking is that the ice is drai

10、ning off the land faster. Ice floating on the surrounding seas usually acts as a brake, holding back glaciers on land, so as this ice is lost the glaciers flow faster. The acceleration of the Jakobshavn glacier in Greenland is thought to be the result of warm currents melting the floating tongue of

11、the glacier. Other outlet glaciers are being attacked in a similar way. Mike MacCracken of the Climate Institute in Washington DC is one of those starting to think that we shouldnt just sit back and let warm currents melt ice shelves. “Is there some way of doing something to stop that flow, or cool

12、the water?“ he asks. Last year, physicist Russel Seitz at Harvard University suggested that the planet could be cooled by using fleets of customised boats to generate large numbers of tiny bubbles. This would whiten the surface of the oceans and so reflect more sunlight. MacCracken says the bubbles

13、might be better arranged in a more focused way, to cool the currents that are undermining the Jakobshavn glacier and others like it. A couple of degrees of chill would take this water down to freezing point, rendering it harmless. “At least that would slow the pace of change,“ MacCracken says. What

14、about a more direct approach: building a physical barrier to halt a glaciers flow into the sea by brute force? Bindshadler thinks that is a non-starter. “The ice discharge has many sources, mostly remote and in environments where barriers are not likely to work,“ he says. “Taking just the one exampl

15、e I know best, the Pine Island glacier in Antarctica drains into an ice shelf that at its front is 25 kilometres across and 500 metres thick, and moves at over 10 metres per day. The seabed there is 1000 metres down and is made of sediment(沉淀物 )hundreds of metres thick and the consistency of toothpa

16、ste.“ Not your ideal building site. A slightly more subtle scheme to rein in the glaciers was proposed more than 20 years ago by Douglas MacAyeal of the University of Chicago. His idea is to fight ice with ice. The big outlet glaciers feed into giant floating shelves of ice, which break off into ice

17、bergs at their outer edges. MacAyeal suggested pumping water up from beneath the ice and depositing it on the upper surface, where it would freeze to form a thick ridge, weighing down the floating ice shelf. Add enough ice in this way, and the bottom of the ice shelf would eventually be forced down

18、onto the seabed. Friction with the seabed would slow down the shelf s movement, which in turn would hold back the glaciers feeding into it. It would be like tightening an immense valve. “I think its quite an inspired idea,“ says Bindshadler. But nobody has followed it up to work out how practical th

19、e scheme would be. “On the back of an envelope it has promise but these ice shelves are big. You would need a lot of drilling equipment all over the ice shelf, and my intuition is that if you look at the energetics of it, it wont work,“ Bindshadler says. Even if we could apply brakes to glaciers, th

20、is would only slow down sea level rise. Could we do better than that and reverse it actually make the sea retreat? If you think of the sea as a giant bathtub, then the most obvious way to lower its level is to take out the plug. “One of the oldest notions is filling depressions on the land,“ says Ma

21、cCracken. Among the largest of these is the Qattara depression in northern Egypt, which at its lowest point is more than 130 metres below sea level. Various schemes have been proposed to channel water from the Mediterranean into the depression to generate hydroelectric(水力的 )power, and as a by-produc

22、t a few thousand cubic kilometres of the sea would be drained away. Unfortunately, thats only enough to shave about 3 millimetres off sea level: a drop in the ocean. And there would be grave consequences for the local environment. “The leakage of salt water through fracture systems would add salt to

23、 aquifers(含水层 )for good,“ says Farouk El-Baz, a geologist at Boston University who has studied the region. Refilling the Dead Sea is no better. Because of surrounding hills, this depression could be filled to 60 metres above sea level, but even that would only offset the rise by 5 millimetres and dr

24、own several towns into the bargain. The notion of engineering lower sea levels remains a highly abstract topic. “If the world doesnt control emissions, Im pretty sure that no geo-engineering solution will work and it would potentially create other side effects and false promises,“ says MacCracken. “

25、But if we do get on a path to curbing emissions dramatically down 50 per cent by 2050, say then the question becomes, can geoengineering help with the hump were going to go through over the next few centuries?“ 2 Spending trillions of dollars at sea-level rise problem could _. （ A） probably save onl

26、y a few cities （ B） defend all low-lying coastal areas （ C） definitely find perfect solution （ D） do nothing to save our planet 3 The conventional geo-engineering schemes will have little effect if_. （ A） it dont work out as planned （ B） there arent drastic emission cuts （ C） it isnt put into practi

27、ce now （ D） there arent enough financial support 4 The ice floating on the surrounding seas of Greenland is to _. （ A） stop the glaciers move away （ B） make the glaciers flow faster （ C） accelerate the melting of glaciers （ D） prevent ships from crashing into glaciers 5 What was physicist Russel Sei

28、tzs suggestion to cool the planet? （ A） Arranging the warm currents in a more focused way. （ B） Whitening the surface of lands to reflect more sunlight. （ C） Generating tiny bubbles with fleets of customised boats. （ D） Producing chilly winds to cool the water to freezing point. 6 What is Bindshadle

29、rs attitude to building physical barriers to keep glaciers? （ A） It is hard at the beginning. （ B） Its success depends on the conditions （ C） It is not practical to do so. （ D） It is effective in stopping the glaciers. 7 Douglas MacAyeal advised to pump water up from beneath the ice to _. （ A） break

30、 down the glaciers （ B） fight ice with ice （ C） tighten an immense valve （ D） weigh down the floating ice shelf 8 Why does Bindshadler think MacAyeals idea wont work? （ A） It consumes too much energy. （ B） Nobody wants to put the theory into practice. （ C） The idea is only a commonplace. （ D） It has

31、 been proven ineffective in practice. 9 One of the oldest ways to retreat the sea is to fill _ on the land. 10 Channeling water from the Mediterranean into Qattara depression can both generate electricity and _ some sea water. 11 At the end of the passage, MacCracken believes the foundation of the s

32、uccess of geo-engineering solution is_. Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. Aft

33、er each question there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer. （ A） Visit Nancy at her new department. （ B） Give the secretary Nancys new phone number. （ C） Call on Nancy at her medical school. （ D） Get information

34、about Nancy from the secretary. （ A） He is weak in health. （ B） He has caught a cold. （ C） He is very careless. （ D） He is seriously ill. （ A） Read the operational manual. （ B） Try the buttons one by one. （ C） Make the machine run slowly. （ D） Ask her instructor for advice. （ A） He thinks the police

35、s action was justified. （ B） He thinks the students were totally wrong. （ C） He wants to find out the students side of the story. （ D） He wants to find out more before he takes a stand. （ A） He doesnt like new dorm rooms. （ B） He doesnt have a roommate. （ C） He dislikes having a roommate. （ D） He pr

36、efers having a roommate. （ A） Because of its friendly folks. （ B） Because of its clean air. （ C） Because of its quietness. （ D） Because of the sense of freshness. （ A） She admitted her carelessness. （ B） She is not to blame. （ C） Shell accept all responsibility. （ D） Shell be more careful next time.

37、 （ A） Lower the students grade. （ B） Reconsider the students position later. （ C） Allow the student to miss class. （ D） Suggest the student reschedule the surgery. （ A） The travel time. （ B） The travel route. （ C） The meeting time. （ D） The traffic condition. （ A） Through email. （ B） By telephone. （

38、 C） Write comments to them. （ D） Meet them face-to-face. （ A） The traffic is often very bad. （ B） He lives far away from work. （ C） He doesnt know where to park his bike. （ D） He is always in a hurry. （ A） The goals of the employees. （ B） The objectives of the organization. （ C） The structure of the

39、 organization. （ D） The personal prospect of the leader. （ A） The rewards for the leader. （ B） The reputation of a leader. （ C） The approach to achieving goals. （ D） The payment of employees. （ A） Find something you are passionate about. （ B） Learn how to run a business. （ C） Make a business out of

40、something. （ D） Learn how to manage and lead people. （ A） Avoid the difficult part in the job. （ B） Ask the company for help. （ C） Learn hard by working extra hours. （ D） Find a more experienced counselor. Section B Directions: In this section, you will hear 3 short passages. At the end of each pass

41、age, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D. （ A） Affection and politeness. （ B） Situations and intimacy. （ C） Attitudes and relationships. （ D） E

42、motions and behavior. （ A） It follows a universal pattern. （ B） It varies among individuals and cultures. （ C） It changes from countries to countries. （ D） It depends on moods. （ A） They never judge people by their own norms. （ B） They are those with strong emotions. （ C） They probably have more fac

43、ial expressions. （ D） They are reluctant to show emotions. （ A） It was difficult to relocate its path again. （ B） It was built to facilitate transportation of minerals. （ C） It was built by the Canadians. （ D） It was built in the late 19th century. （ A） Maine gradually became a major market for trad

44、e. （ B） Maine provided employment opportunities. （ C） Maine was politically stable. （ D） Maine had a pleasant climate. （ A） Because of the strong French influence. （ B） Because they shared the same road. （ C） Because they belonged to the same country. （ D） Because of the immigration policy. （ A） He

45、made up his mind to work for the disable. （ B） He decided to work in an auto company. （ C） He unfortunately had a car accident. （ D） .He invented a new type of vehicle. （ A） A driver. （ B） A sales manager. （ C） An engineer. （ D） An advertising executive. （ A） It can be controlled remotely. （ B） It t

46、akes much room of a car. （ C） It has some merits and drawbacks. （ D） It is rather expensive. （ A） It will turn out to be a failure. （ B） It will receive a lot of orders. （ C） It helps depress the economy. （ D） It downturns the economy to a great extent. Section C Directions: In this section, you wil

47、l hear a passage three times. When the passage is read for the first time, you should listen carefully for its general idea. When the passage is read for the second time, you are required to fill in the blanks numbered from 36 to 43 with the exact words you have just heard. For blanks numbered from

48、44 to 46 you are required to fill in the missing information. For these blanks, you can either use the exact words you have just heard or write down the 36 Ninety percent of Americans know that most of their compatriots are overweight, but just 40 percent believe themselves to be too fat. Government

49、【 B1】 _ show that more than 60 percent of the U.S. population is overweight, and half is obese, meaning they are at serious【 B2】 _ of health effects from their weight. But the Pew Research Center telephone survey of more than 2,000 adults finds that many people【 B3】 _ how tall they are and underestimate how much they weigh and thus do not rate themselves as overweight, even when they are. The survey finds that most Americans, including those who say they are overwe