【題目】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:污染在中國(guó)是一個(gè)嚴(yán)重的問題,PM2.5最近幾年持續(xù)上升。A. wrong錯(cuò)誤;B. question一般性需要回答的問題;C. problem指需要解決的難題;D. matter麻煩事。根據(jù)句意污染在中國(guó)是應(yīng)該需要解決的嚴(yán)重問題。所以答案是C。

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