【題目】About seventy percent of the earth with water.

A. is covering B. is covered 　C. are covering D. are covered

【答案】B

【解析】

試題句意：地球大約70%的部分被水覆蓋著。the earth做主語為不可數(shù)名詞，所以謂語動詞用單數(shù)形式，地球與水覆蓋應該是動賓關系，所以用被動語態(tài)；故選B。

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