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More than 70 percent of the surface of the earth water. [ ] A.is made up ofB.is

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More than 70 percent of the surface of the earth water. [ ] A.is made up ofB.is

More than 70 percent of the surface of the earth ________ water.

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A.is made up ofB.is covered by C.are covered byD.are made up of

试题答案

答案:B