______of the earth ______ covered by water.
A. Two thirds; is         B. Two thirds; are       C. One thirds; is   
A

試題分析：句意：地球的三分之二被水所覆蓋。在英語中分子用基數(shù)詞表達(dá)，分母用序數(shù)詞表達(dá)如果分子大于1，分母變復(fù)數(shù)。分?jǐn)?shù)，作主語時(shí)，根據(jù)其后接的詞而定，如果為不可數(shù)名詞，則相當(dāng)于單數(shù)，如果其后接的為可數(shù)名詞復(fù)數(shù)形式，則相當(dāng)于復(fù)數(shù)。故選A
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