题目内容

About ___________of the workers in the factory were born in__________.
A．three-fifths, 1970sB．three- fifths, the 1970s
C．three- fifth, the 1970sD．three- fifth, 1970
Ｂ

试题分析：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。句意：这个工厂的大约五分之三的工人出生在七十年代。结合语境可知下文特指某个年代，故需用定冠词，选项CD结构有误，故选B。
点评：英语分数的表达规则比较固定，学习中应牢记这些基本规则。需注意的是，由分数修饰的主语后面谓语动词的数，和被修饰主语的单复数保持一致。英语中年代用定冠词加十位整数的复数形式构成。
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