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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