練習:
1． According to the first two paragraphs，the author thinks that
A strong measures have been taken by the government to prevent global warming．
B to reduce carbon emissions is all impossible mission．
C despite the difficulty，scientists have some options to prevent global warming．
D actions suggested by scientists will never be realized．
2． Scientists resist talking about their options because they dont want people to
A know what they are doing．
B feel their efforts are useless．
C think the problem has been solved．
D see the real problem．
3． What does Stephen Schneider say about a heroin addict and methadone?
A Methadone is an effective way to treat a hard heroin addict．
B Methadone is not a correct way to treat a heroin addict．
C Hospitalization together with methadone can work effectively with a heroin addict．
D Methadone and heroin are equally effective in treating a heroin addict．
4． What is Stephen Schneider’s idea of preventing global warming?
A To ask governments to take stronger measures;
B To increase the sunlight reaching the Earth．
C To apply sunscreen to the Earth．
D To decrease greenhouse gases．
5． What is NOT true of the effectiveness of “sunscreen”，according to the last paragraph?
A It deflects sunlight reaching the Earth to counteract the warming．
B It blocks the incident energy in the sun’s rays．
C It is a controversial method．
D It decreases greenhouse gases in the atmosphere．
答案與題解：
1． C 短文第一段講了防止地球變暖是一項艱巨的任務(wù)，第二段說，盡管如此，科學家還是有一些辦法，所以C是正確選擇。A是錯誤選擇，因為作者認為政府和一些利益集團阻礙了科學家所倡導(dǎo)的行動的實施；B不是作者的觀點；D也不是正確選擇，因為第一段的最后一句“might not be implemented soon enough”并不表明永遠不能實現(xiàn)。
2． C 文章的第二段說，即使最糟糕的情況發(fā)生，科學家還是有幾招的。但他們不希望討論他們的招數(shù)，因為恐怕人們不再有危機感而削弱徹底解決問題的努力。所以C是正確選擇。
3． A 文章的第二段中，Stephen Schneider教授將自己解決地球變暖問題的辦法比作美沙酮，因為在癮君子拒絕正常住院治療時，服用美沙酮是一種緩解海洛因毒癮的有效方法。所以，A是正確的選擇。
4． C 文章最后一段的第一個句子提供的答案。
5． D 短文最后一段描述了“sunscreen”如何解決地球變暖問題。盡管有爭議，但是研究證明，“太陽屏”能反射和阻礙陽光，起到抵消由溫室效應(yīng)引起的地球升溫。最后一段的第三和第四句是理解這個問題的關(guān)鍵。D不是文章所表達的內(nèi)．容，所以是正確答案。