【題目】As we all know, about 75 percent of the earth_______covered by water.

A. is B. are C. am D. were

【答案】A

【解析】句意:我們都知道,地球的75%被水覆蓋;鶖(shù)詞+percent of表示……的百分之幾十,由分?jǐn)?shù)修飾的主語后面謂語動詞的數(shù),和被修飾主語的單復(fù)數(shù)保持一致。earth表示單數(shù)含義,故答案選A。

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