2. 外语
  3. In this densely populated city, acid rain is______; it is a sign both of industrialization and pollution.

In this densely populated city, acid rain is______; it is a sign both of industrialization and pollution.

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问题 In this densely populated city, acid rain is______; it is a sign both of industrialization and pollution.
选项 A、prevalent
B、productive
C、popular
D、possible
答案A
解析 形容词词义辨析。根据句意，酸雨很普遍。选项中，prevalent意为“普遍的，流行的”，符合句意。故答案为A。
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