题目内容
About ___of the workers in the factory were born_____.
| A．two thirds,in the 1970 | B．two thirds,in the 1970s |
| C．two third,in the 1970 | D．second thirds,in the 1970s |
B
解析试题分析：句意:在这个工厂大约三分之二的工人出生在20世纪70年代。英语中分数的表达方法是，分子用基数词，分母用序数词，当分子大于一的时候，分母加-s，故三分之二应是two thirds；in the 1970s意为在20世纪70年代，是一个固定的表达方式。故选B。
考点：考查数词。
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