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【题目】There are fifty students in this class, ________ of them are boys, so the number of the boys is 30.

A.three fifthB.three fifthsC.three five

【答案】B

【解析】

句意:班上有50名学生,五分之三是男生,因此男生的数量是30人。

考查分数的表达。分数是由基数词和序数词一起来表示的。基数词作分子,分子是three;序数词作分母,除了分子是1以外,其他情况下序数词都要用复数形式,此处分母用序数词的复数fifths。故选B

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