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    【题目】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】

    试题句意：地球大约70%的部分被水覆盖着。the earth做主语为不可数名词，所以谓语动词用单数形式，地球与水覆盖应该是动宾关系，所以用被动语态；故选B。

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