練習(xí)：
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(xiàng)艱巨的任務(wù)，第二段說(shuō)，盡管如此，科學(xué)家還是有一些辦法，所以C是正確選擇。A是錯(cuò)誤選擇，因?yàn)樽髡哒J(rèn)為政府和一些利益集團(tuán)阻礙了科學(xué)家所倡導(dǎo)的行動(dòng)的實(shí)施；B不是作者的觀點(diǎn)；D也不是正確選擇，因?yàn)榈谝欢蔚淖詈笠痪洹癿ight not be implemented soon enough”并不表明永遠(yuǎn)不能實(shí)現(xiàn)。
2. C 文章的第二段說(shuō)，即使最糟糕的情況發(fā)生，科學(xué)家還是有幾招的。但他們不希望討論他們的招數(shù)，因?yàn)榭峙氯藗儾辉儆形C(jī)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?yàn)樵诎a君子拒絕正常住院治療時(shí)，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(gè)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(zhēng)議，但是研究證明，“太陽(yáng)屏”能反射和阻礙陽(yáng)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(gè)問題的關(guān)鍵。D不是文章所表達(dá)的內(nèi)。容，所以是正確答案。