70 percent of the surface ________ water.


  1. A.
    is covered with
  2. B.
    cover with
  3. C.
    are covered with
  4. D.
    covers with
A
解析：
【巧解導(dǎo)析】“百分?jǐn)?shù)+of+不可數(shù)名詞”，謂語應(yīng)用單數(shù)動(dòng)詞．也就是說，百分?jǐn)?shù)作主語時(shí)謂語動(dòng)詞要看它后面的名詞是不可數(shù)名詞還是可數(shù)名詞復(fù)數(shù)．如果是不可數(shù)名詞則用單數(shù)動(dòng)詞，如果是可數(shù)名詞復(fù)數(shù)則用復(fù)數(shù)動(dòng)詞．
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