阅读下面的短文。每篇短文的后面有五个问题，每个问题有四个备选答案。请根据短文的内容选择最佳答案。每个试题计3分,共计15分。

　　Even with the best will1 in the world，reducing our carbon emissions is not going to prevent global warming.It has become clear that even if we take the most strong measures to control emissions，the uncertainties in our climate models still leaye open the possibility of extreme warming and rises in sea level.At the same time，resistance by governments and special interest groups makes it quite possible that the actions suggested by climate scientists might not be implemented soon enough.

　　Basically the idea is to apply sunscreen to the whole planet.One astronomer has come up with a radical plan to cool Earth;launch trillions of feather-light discs into space，where they would form a vast cloud that would block the suns rays.Its controversial，but recent studies suggest there are ways to deflect just enough of the sunlight reaching the Earths surface to counteract the warming produced by the greenhouse effect.Global climate models show that blocking just 1.8 per cent of the incident energy in the suns rays would cancel out the warming effects produced by a doubling of greenhouse gases in the atmosphere. That could be crucial，because even the most severe emissions-control measures being proposed would leave us with a doubling of carbon dioxide by the end of this century，and that would last for at least a century more.

　　emissionn.发射，发射物 heroinn.海洛因

　　n.住院治疗

　　geoengineering n.地质工程 astronomern.天文学家

　　百万兆; 万亿，兆

　　adj.有争议的

　　注释：

　　2. if the worst comes to theworst：如果最最糟糕的事情发生了。这是英式英语的用法，在美式英语中它说成if worst comes to worst。在不同的语境中，有不同的泽法，如：If the worst comes to the worst，Becky thought，my retreatsecure;and l have the right- hand seat inthe barouche.蓓墓想道：逼到最后一条路，逃难是不怕的了，在他的大马车里，我稳稳地有一个位子了。又如：Ifthe worst comes to the worst，well sell the car.大不了我们把车卖了。

　　4. methadone：美沙酮，一种有效的合成麻醉药，它不像口马啡或海洛因那样容易汁人上瘾，在戒毒治疗中被用作这些毒品的替代品。

　　1. According to the first two paragraphs，the author thinks that

　　B to reduce carbon emissions is all impossible mission.

　　D actions suggested by scientists will never be realized.

　　A know what they are doing.

　　C think the problem has been solved.

　　3. What does Stephen Schneider say about a heroin addict and methadone?

　　B Methadone is not a correct way to treat a heroin addict.

　　D Methadone and heroin are equally effective in treating a heroin addict.

　　A To ask governments to take stronger measures;

　　C To apply sunscreen to the Earth.

　　5. What is NOT true of the effectiveness of sunscreen，according to the last paragraph?

　　B It blocks the incident energy in the suns rays.

　　D It decreases greenhouse gases in the atmosphere.

　　1. C 短文第一段讲了防止地球变暖是一项艰巨的任务，第二段说，尽管如此，科学家还是有一些办法，所以C是正确选择。A是错误选择，因为作者认为政府和一些利益集团阻碍了科学家所倡导的行动的实施;B不是作者的观点;D也不是正确选择，因为第一段的最后一句might not be implemented soon enough并不表明永远不能实现。

　　3. A 文章的第二段中，Stephen Schneider教授将自己解决地球变暖问题的办法比作美沙酮，因为在瘾君子拒绝正常住院治疗时，服用美沙酮是一种缓解海洛因毒瘾的有效方法。所以，A是正确的选择。

　　5. D 短文最后一段描述了sunscreen如何解决地球变暖问题。尽管有争议，但是研究证明，太阳屏能反射和阻碍阳光，起到抵消由温室效应引起的地球升温。最后一段的第三和第四句是理解这个问题的关键。D不是文章所表达的内.容，所以是正确答案。

　　阅读下面的短文。每篇短文的后面有五个问题，每个问题有四个备选答案。请根据短文的内容选择最佳答案。每个试题计3分,共计15分。

　　Even with the best will1 in the world，reducing our carbon emissions is not going to prevent global warming.It has become clear that even if we take the most strong measures to control emissions，the uncertainties in our climate models still leaye open the possibility of extreme warming and rises in sea level.At the same time，resistance by governments and special interest groups makes it quite possible that the actions suggested by climate scientists might not be implemented soon enough.

　　Basically the idea is to apply sunscreen to the whole planet.One astronomer has come up with a radical plan to cool Earth;launch trillions of feather-light discs into space，where they would form a vast cloud that would block the suns rays.Its controversial，but recent studies suggest there are ways to deflect just enough of the sunlight reaching the Earths surface to counteract the warming produced by the greenhouse effect.Global climate models show that blocking just 1.8 per cent of the incident energy in the suns rays would cancel out the warming effects produced by a doubling of greenhouse gases in the atmosphere. That could be crucial，because even the most severe emissions-control measures being proposed would leave us with a doubling of carbon dioxide by the end of this century，and that would last for at least a century more.

　　emissionn.发射，发射物 heroinn.海洛因

　　n.住院治疗

　　geoengineering n.地质工程 astronomern.天文学家

　　百万兆; 万亿，兆

　　adj.有争议的

　　注释：

　　2. if the worst comes to theworst：如果最最糟糕的事情发生了。这是英式英语的用法，在美式英语中它说成if worst comes to worst。在不同的语境中，有不同的泽法，如：If the worst comes to the worst，Becky thought，my retreatsecure;and l have the right- hand seat inthe barouche.蓓墓想道：逼到最后一条路，逃难是不怕的了，在他的大马车里，我稳稳地有一个位子了。又如：Ifthe worst comes to the worst，well sell the car.大不了我们把车卖了。

　　4. methadone：美沙酮，一种有效的合成麻醉药，它不像口马啡或海洛因那样容易汁人上瘾，在戒毒治疗中被用作这些毒品的替代品。

　　1. According to the first two paragraphs，the author thinks that

　　B to reduce carbon emissions is all impossible mission.

　　D actions suggested by scientists will never be realized.

　　A know what they are doing.

　　C think the problem has been solved.

　　3. What does Stephen Schneider say about a heroin addict and methadone?

　　B Methadone is not a correct way to treat a heroin addict.

　　D Methadone and heroin are equally effective in treating a heroin addict.

　　A To ask governments to take stronger measures;

　　C To apply sunscreen to the Earth.

　　5. What is NOT true of the effectiveness of sunscreen，according to the last paragraph?

　　B It blocks the incident energy in the suns rays.

　　D It decreases greenhouse gases in the atmosphere.

　　1. C 短文第一段讲了防止地球变暖是一项艰巨的任务，第二段说，尽管如此，科学家还是有一些办法，所以C是正确选择。A是错误选择，因为作者认为政府和一些利益集团阻碍了科学家所倡导的行动的实施;B不是作者的观点;D也不是正确选择，因为第一段的最后一句might not be implemented soon enough并不表明永远不能实现。

　　3. A 文章的第二段中，Stephen Schneider教授将自己解决地球变暖问题的办法比作美沙酮，因为在瘾君子拒绝正常住院治疗时，服用美沙酮是一种缓解海洛因毒瘾的有效方法。所以，A是正确的选择。

　　5. D 短文最后一段描述了sunscreen如何解决地球变暖问题。尽管有争议，但是研究证明，太阳屏能反射和阻碍阳光，起到抵消由温室效应引起的地球升温。最后一段的第三和第四句是理解这个问题的关键。D不是文章所表达的内.容，所以是正确答案。