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

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

【答案】D

【解析】

句意:大約70%的地球被水覆蓋著。

考查百分?jǐn)?shù)表達(dá)和主謂一致。percent百分之……,代表百分號(hào);后接介詞of時(shí)表示整體中的部分,是單數(shù)意義,系詞需用is;根據(jù)句意可知選D。

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