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【题目】 of the earth is covered with water.
A.two-three
B.two-third
C.two-thirds
D.second-three

【答案】C
【解析】句意:三分之二的地球被水覆盖。根据句意及题干分析此题是考查分数的表达,分子应用基数词,分母应用序数词,分子大于一时,分母用复数,故选C。

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