【題目】Is _______ air pollution ________ serious problem now?

A. a, a B. /, a C. the, the D. the, /

【答案】B

【解析】

試題分析：句意： 空氣污染現(xiàn)在是一個嚴重的問題嗎？第一空不需要冠詞，第二空用不定冠詞a，其名稱是可數(shù)名詞problem，泛指“一個”，故選B。

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