2. 外语
  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 第一段最后一句“If this view is correct...”表明作者只是引用这种现象并不确定其正确性。
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