大学英语六级分类模拟题420及答案解析.doc

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1、大学英语六级分类模拟题 420 及答案解析(总分：340.00，做题时间：90 分钟)一、Part Writing(总题数：5，分数：269.00)1.Directions: For this part, you are allowed 30 minutes to write an essay commenting on the remark “There isn“t anything noble about being superior to another person. True nobility is in being superior to the person you once w

2、ere.“ You can give examples to illustrate your point and then explain what you will do to stay modest. You should write at least 150 words but no more than 200 words. Write your essay on Answer Sheet 1. （分数：106.50）_2.Directions : For this part, you are allowed 30 minutes to write an essay on perseve

3、rance by referring to the saying “What you do every day matters more than what you do every once in a while.“ You can cite examples to illustrate your point and then explain what you will do to enhance your perseverance. You should write at least 150 words but no more than 200 words. Write your essa

4、y on Answer Sheet 1. （分数：106.50）_3.Directions: For this part, you are allowed 30 minutes to write an essay commenting on the saying “Better three hours too soon than a minute too late.“ You can cite examples to illustrate your point. You should write at least 150 words but no more than 200 words. （分

5、数：20.00）_4.Directions : For this part, you are allowed 30 minutes to write an essay entitled On Aiming Higher by commenting on the saying “Who aims at excellence will be above mediocrity; who aims at mediocrity will be far short of it.“ You should write at least 150 words but no more than 200 words.

6、 （分数：20.00）_5.Directions: For this part, you are allowed 30 minutes to write a short essay on the major ranking in university. You should write at least 150 words but no more than 200 words. Write your essay on Answer Sheet 1. （分数：16.00）_二、Part Reading Compr(总题数：0，分数：0.00)Blowing Hot and ColdA. Clim

7、ate change may be slow and uncertain, but that is no excuse for inaction. One reason why uncertainty over climate change looks to be with us for a long time is that the oceans, which absorb carbon from the atmosphere, act as a time-delay mechanism. Their massive thermal inertia means that the climat

8、e system responds only very slowly to changes in the composition of the atmosphere. Another complication arises from the relationship between carbon dioxide (CO 2 ), the principal greenhouse gas (GHG), and sulphur dioxide (SO 2 ), and a common pollutant. Efforts to reduce man-made emissions of GHGs

9、by cutting down on fossil-fuel use will reduce emissions of both the gases. The reduction in CO 2 will cut warming, but the concurrent SO 2 cut may mask that effect by contributing to the warming. B. There are so many such fuzzy factorsranging from aerosol particles to clouds to cosmic radiationthat

10、 we are likely to see disruptions of familiar climate patterns for many years without knowing why they are happening or what to do about them. Tom Wigley, a leading climate scientist and member of the UN“s Intergovernmental Panel on Climate Change (IPCC), goes further. He argues in an excellent book

11、 published by the Aspen Institute, “US Policies on Climate Change: What Next?“, that whatever policy changes governments pursue, scientific uncertainties will “make it difficult to detect the effects of such changes, probably for many decades.“ C. As evidence, he points to the negligible short-to me

12、dium-term difference in temperature resulting from an array of emission “pathways“ on which the world could choose to embark if it decided to tackle climate change. He plots various strategies for reducing GHGs that will lead in the next century to the stabilization of atmospheric concentrations of

13、CO 2 at 550 parts per million (ppm). That is roughly double the level which prevailed in preindustrial times, and is often suggested by climate scientists as a reasonable target. But even by 2040, the temperature differences between the various options will still be tinyand certainly within the magn

14、itude of natural climatic variance. In short, in another four decades we will probably still not know if we have over-or under-shot. D. However, that does not mean we know nothing. We do know, for a start, that the “greenhouse effect“ is real: without the heat-trapping effect of water vapor, CO 2 ,

15、methane and other naturally occurring GHGs, our planet would be a lifeless 30 or so colder. Some of these GHG emissions are captured and stored by “sinks“, such as the oceans, forests and agricultural land, as part of nature“s carbon cycle. E. We also know that since the industrial revolution began,

16、 mankind“s actions have contributed significantly to that greenhouse effect. Atmospheric concentrations of GHGs have risen from around 280ppm two centuries ago to around 370ppm today, thanks chiefly to mankind“s use of fossil fuels and, to a lesser degree, to deforestation and other land-use changes

17、. Both surface temperatures and sea levels have been rising for some time. F. There are good reasons to think temperatures will continue rising. The IPCC has estimated a likely range for that increase of 1.4-5.8 over the next century, although the lower end of that range is more likely. Since what m

18、atters is not just the absolute temperature level but the rate of change as well, it makes sense to try to slow down the increase. G. The worry is that a rapid rise in temperatures would lead to climate changes that could be devastating for many (though not all) parts of the world. Central America,

19、most of Africa, much of south Asia and northern China could all be hit by droughts, storms and floods and otherwise made miserable. H. The colder parts of the world may benefit from warming, but they too face danger. One is the conceivable collapse of the Atlantic “conveyor belt“, a system of curren

20、ts that gives much of Europe its relatively mild climate; if temperatures climb too high, say scientists, the system may undergo radical changes that damage both Europe and America. That points to the biggest fear: warming may trigger irreversible changes that transform the earth into a largely unin

21、habitable environment. I. Given that possibility, extremely remote though it is, it is no comfort to know that any attempts to stabilize atmospheric concentrations of GHGs at a particular level will take a very long time. Because of the oceans“ thermal inertia, explains Mr. Wigley, even once atmosph

22、eric concentrations of GHGs are stabilized, it will take decades or centuries for the climate to follow suit. And even then the sea level will continue to rise. This is a vast challenge, and it is worth bearing in mind that mankind“s contribution to warming is the only factor that can be controlled.

23、 So the sooner we start drawing up a long-term strategy for climate change, the better. J. That is why the long-term objective for climate policy must be a transition to a low-carbon energy system. Such a transition can be very gradual and need not necessarily lead to a world powered only by bicycle

24、s and windmills, for two reasons that are often overlooked. K. One involves the precise form in which the carbon in the ground is distributed. According to Michael Grubb of the Carbon Trust, a British quasi-governmental body, the long-term problem is coal. In theory, we can burn all of the conventio

25、nal oil and natural gas in the ground and still meet the most ambitious goals for tackling climate change. If we do that, we must ensure that the far greater amounts of carbon trapped as coal (and unconventional resources like tar sands) never enter the atmosphere. The other reason, as scientists to

26、ok care to point out, is that it is net emissions of CO 2 that need to peak and decline. That leaves scope for the continued use of fossil fuels as the main source of modern energy if only some magical way can be found to capture and dispose of the associated CO 2 . Happily, scientists already have

27、some magic in the works. L. Two decades ago, the world faced a similar dilemma: evidence of a hole in the ozone layer. Some inconclusive signs suggested that it was man-made, caused by the use of chlorofluorocarbons (CFCs). There was the distant threat of disaster, and the knowledge that a concerted

28、 global response was required. Industry was reluctant at first, yet with leadership from Britain and America the Montreal Protocol was signed in 1987. That deal has proved surprisingly successful. The manufacture of CFCs is nearly phased out, and there are already signs that the ozone layer is on th

29、e way to recovery. M. This story holds several lessons for the admittedly far more complex climate problem. First, it is the rich world which has caused the problem and which must lead the way in solving it. Second, the poor world must agree to help, but is right to insist on being given timeas well

30、 as money and technologyto help it adjust. Third, industry holds the key: in the ozone-depletion story, it was only after DuPont and ICI broke ranks with the rest of the CFC manufacturers that a deal became possible. N. The final lesson is the most important: that the uncertainty surrounding a threa

31、t such as climate change is no excuse for inaction. New scientific evidence shows that the threat from ozone depletion had been much deadlier than was thought at the time when the world decided to act.（分数：71.00）(1).Scientists hold that by 2040 the temperature differences will still be small and in t

32、he next forty years we still don“t know whether we try much about that.（分数：7.10）(2).The rapid rise in temperature will lead to climate changes which in turn will bring forth threat to the earth in many parts of the world.（分数：7.10）(3).The reduction of greenhouse gas by cutting down fossil-fuel use wi

33、ll delay the global warming, but at the same time the reduction of sulphur dioxide will also result in global warming.（分数：7.10）(4).We know that since Industrial Revolution humans caused the greenhouse effect, thus making the temperature rising.（分数：7.10）(5).If a good way can be found to trap and disp

34、ose of the associated CO 2 , there is the possibility of continuing to use fossil fuels as the main sources of modern energy.（分数：7.10）(6).In recent years, scientists have reported that some uncertain factors disrupt the climate change.（分数：7.10）(7).New scientific data prove that the threat from ozone

35、 depletion have been much more devastating than people thought at the time when they decided to take action.（分数：7.10）(8).Over the next century the temperature will be more likely to rise from 1.4 to 5.8 according to the estimation of IPCC.（分数：7.10）(9).Theoretically, people can burn all of the tradit

36、ional natural resources and can still satisfy the great goals of dealing with climate change.（分数：7.10）(10).According to the Montreal Protocol, the production of CFCs almost stopped, and the signs show that the ozone layer is recovering.（分数：7.10）大学英语六级分类模拟题 420 答案解析(总分：340.00，做题时间：90 分钟)一、Part Writin

37、g(总题数：5，分数：269.00)1.Directions: For this part, you are allowed 30 minutes to write an essay commenting on the remark “There isn“t anything noble about being superior to another person. True nobility is in being superior to the person you once were.“ You can give examples to illustrate your point and

38、 then explain what you will do to stay modest. You should write at least 150 words but no more than 200 words. Write your essay on Answer Sheet 1. （分数：106.50）_正确答案：()解析：“There isn“t anything noble about being superior to another person. True nobility is in being superior to the person you once were.

39、“ That means meaningless comparison with other people is not nobility; the true one is comparing with oneself. Based on this, I think modesty is true nobility. People have various kinds of life, so being superior to another person makes no sense, let alone being noble. For example, our late respectf

40、ul leader Liu Shaoqi often interacted with workers and farmers, saying that the difference of various kinds of work lay in different task allocations, not in that one is superior to another. Although he was in high authority, he still stayed modest, treating everybody equally, no matter which class

41、they belong to. This is why he has been, up to now, respected and commemorated by Chinese people and even people in some other countries. If you are modest, you can be respected by others. If you think yourself as a Mr. know-it-all, you may become short-sighted and conceited. Modesty is the secret t

42、o make progress. One that is modest is not necessarily noble, but modesty surely is a principal quality for a nobleman.2.Directions : For this part, you are allowed 30 minutes to write an essay on perseverance by referring to the saying “What you do every day matters more than what you do every once

43、 in a while.“ You can cite examples to illustrate your point and then explain what you will do to enhance your perseverance. You should write at least 150 words but no more than 200 words. Write your essay on Answer Sheet 1. （分数：106.50）_正确答案：()解析：The saying “What you do every day matters more than w

44、hat you do every once in a while“ embodies the importance of perseverance. Perseverance is the continuous effort to do something despite difficulties or opposition. The application of perseverance to any task or goal is often what distinguishes between those who are successful and those who fail. Th

45、omas Edison failed thousands of times before he invented long-lasting light bulbs. When asked about his failures, Edison replied that “They were not failures. I have found thousands of ways that won“t work.“ What a thought-provoking remark! If we learn from our failures and be perseverant, can succe

46、ss be far behind? As for me, I usually take the following measures to enhance my perseverance. Firstly, set a goal and be specific about what result I want to achieve. Then, break the goal down into smaller pieces. Smaller pieces are easier to manage and accomplish, and they“ll give me a sense of ac

47、complishment sooner. Thirdly, keep an optimistic attitude. It doesn“t matter if I fail once or twice. The most important thing is to learn from the failure and carry on. I deeply believe that by paying small efforts every day, success will eventually come to our hands.3.Directions: For this part, you are allowed 30 minutes to write an essay commenting on the saying “Better three hours too soon than a minute too late.“ You can cite examples to illustrate your point. You should write at least 150 words but no more than 200 words. （分数：20.00）_