of the students       boys in our class.

A．One fifth; are B．One fifths; are
C．First fifths; is D．One five; is

A

解析試題分析：句意：在我們班的學(xué)生中有五分之一是男孩。分析：考查分?jǐn)?shù)的表示方法，分子用基數(shù)詞，分母用序數(shù)詞，如果分子超過一，分母要加s，明確第一項(xiàng)正確，同時(shí)學(xué)生是可數(shù)名詞，因此be動(dòng)詞用are.故選A
考點(diǎn)：考查數(shù)詞的用法。

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