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【题目】—Look! There are many books on the shelves.

—And _________ of them are written in English.

A.two fifthsB.two fifthC.two five

【答案】A

【解析】

句意:——看!书架上有许多书。——其中五分之二是用英语写的。

考查分数表达法。分数的构成:分子基数词,分母序数词,分子大于一,分母加-s。也就是说英语中一般用基数词表示分数的分子,用序数词表示分数的分母。当分子是一时,分数的分母用单数形式,在表示分数时,当分数的分子大于一时,分数的分母要用复数形式。选项B中的分子是二,但分母没用复数形式;选项C中的分子和分母用的都是基数词;只有选项A正确。故选A

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