【題目】About ________ of the workers in the factory were born in the ________.

A.two fifths; 1980B.two fifths; 1980s

C.second five; 1980sD.two-fifth; 1980s

【答案】B

【解析】

句意:工廠里大約五分之二的工人都出生在20世紀(jì)80年代。

考查數(shù)詞用法。表示分?jǐn)?shù)時(shí),分子用基數(shù)詞,分母用序數(shù)詞,分子大于1時(shí),分母必須用序數(shù)詞的復(fù)數(shù)形式,排除CD;表達(dá)“……世紀(jì)……年代”時(shí),在表達(dá)年份的阿拉伯?dāng)?shù)字后加s,即1980s。故選B。

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