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【题目】Jim works for________organization against air pollution and he has made ________contribution to it.

A.a; aB.an; aC.a; an

【答案】B

【解析】

句意:吉姆为一个防止空气污染的组织工作,他为该组织作出了贡献。

考查冠词。a/ an一个,不定冠词,表示泛指;根据句意理解可知,两个空都表达“一个”,用来修饰可数名词,第一空后面的名词organization是元音音标开头的单词,所以应该用an,第二空是名词contribution,是辅音音标开头的单词,所以应该用a,故选B

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