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【题目】Pollution is a serious ___________ in China . PM2.5 has been increasing in recent years.
A.wrong
B.question
C.problem
D.matter

【答案】C
【解析】句意:污染在中国是一个严重的问题,PM2.5最近几年持续上升。A. wrong错误;B. question一般性需要回答的问题;C. problem指需要解决的难题;D. matter麻烦事。根据句意污染在中国是应该需要解决的严重问题。所以答案是C。

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