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 retreat”secure;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。
3. scientists still have a few tricks叩their sleeves：科学家们仍然有些不为人所知的招数。 have something up ones sleeve是英语成语，意思是：to have a secret idea or plan，有锦囊妙计，有所保留的，秘而不宣的谋略或计划，例如：If this trip doesn’t work out Ive still got a few ideas up my sleeve.
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。
练习：
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 Schneiders 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 suns rays.
C It is a controversial method.
D It decreases greenhouse gases in the atmosphere.
标准答案： C，C，A，C，D