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【题目】About 70________of the earth ________covered with water.

A.percents; areB.percents; isC.percent; areD.percent; is

【答案】D

【解析】

句意:大约70%的地球被水覆盖着。

考查百分数表达和主谓一致。percent百分之……,代表百分号;后接介词of时表示整体中的部分,是单数意义,系词需用is;根据句意可知选D

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