阅读理解：
Fortunately，if the worst comes to the worst2，scientists still have a few tricks up their sleeves3.For the most part they have strongly resisted discussing these options for fear of inviting a sense of complacency that might thwart efforts to tackle the root of the problem.Until now，that is.A growing number of researchers are taking a fresh look at large-scale geoengineering projects that might be used to counteract global warming.I use the analogy of methadone4, says Stephen Schneider，a climate researcher at Stanford University in California who was among the first to draw attention to global warming.If you have a heroin addict，the correct treatment is hospitalization，and a long rehab. But if they absolutely refuse，methadone is better than heroin.
词汇：
complacencyn.满足 hospitalization
thwartv.反对，阻绕 rehabn.接受康复治疗 E5strRnEmEp
trillionn. counteractv.抵消;抵制
controversialanalogyn.类似;模拟
deflectv.偏转 methadonen.美沙酮，美散痛 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.