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  3. As pointed out at the beginning of the passage, people used to think that air pollution ______. As to the greenhouse effect, th

As pointed out at the beginning of the passage, people used to think that air pollution ______. As to the greenhouse effect, th

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问题 As pointed out at the beginning of the passage, people used to think that air pollution ______.
As to the greenhouse effect, the author ______.
选项 A、shares the same view with the scientists
B、is uncertain of its occurrence
C、rejects it as being ungrounded
D、thinks that it will destroy the world soon
答案B
解析 本题为细节判断题。文中作者列举了两种不同的观点，即一种认为燃烧石油和煤将导致空气中二氧化碳增加，因而产生温室效应；另一种观点认为空气中的粉尘将挡住太阳光辐射，从而使得地球气温降低。但最后作者指出“Today we do not know for sure that either of these conditions will happen"。由此，我们可以推断在作者看来这两种看法都不一定正确，因此无法断定谁是谁非。
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