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About seventy percent of the earth         with water.
A．is coveringB．is covered C．a(chǎn)re coveringD．a(chǎn)re covered
B

試題分析：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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