About ___of the workers in the factory were born_____.
A．two thirds,in the 1970B．two thirds,in the 1970s
C．two third,in the 1970D．second thirds,in the 1970s
B

試題分析：句意:在這個(gè)工廠大約三分之二的工人出生在20世紀(jì)70年代。英語(yǔ)中分?jǐn)?shù)的表達(dá)方法是，分子用基數(shù)詞，分母用序數(shù)詞，當(dāng)分子大于一的時(shí)候，分母加-s，故三分之二應(yīng)是two thirds；in the 1970s意為在20世紀(jì)70年代，是一個(gè)固定的表達(dá)方式。故選B。
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