2. 外语
  3. At present, man’s efforts ______. The main idea of this passage is that ______.

At present, man’s efforts ______. The main idea of this passage is that ______.

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问题 At present, man’s efforts ______.
The main idea of this passage is that ______.
选项 A、the use of man-made materials has had harmful effects on the modern civilization
B、pollution has become a more and more serious problem that is threatening the survival of humanity
C、our technological achievements have grown very rapidly in the last twenty years
D、we should not make increasing industrialization our chief aim
答案B
解析 A项文章未提到；C项文章虽然提到了，但与文章的主题关系不大；D项文章也涉及到，但只是一笔带过。全文始终围绕污染的原因和危害在谈，因此B为正确答案。
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