【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】

試題分析:句意:污染在中國是一個嚴(yán)重的問題,PM2.5最近幾年持續(xù)上升。A. Wrong錯誤;B. Question一般性的問題;C. Problem難以解決的問題;D. Matter事情。根據(jù)句意及語境此題應(yīng)選C。

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