题目内容

12．They tell us that about ______of the teachers in their school are under the age of 40（　　）
A．three-fifthB．third-fifthC．three-fifthsD．third-fifths

分析 他们告诉我们，他们学校大约五分之三的教师年龄在40岁以下．

解答 答案：C．考查分数．句意"他们告诉我们，他们学校大约五分之三的教师年龄在40岁以下．"．分数通常用"基数词+序数词"表示．如果分子大于1，分母要变为复数．因此答案是C．其它不正确．

点评 英语分数的表示法，用"基数词+序数词"表示．通常情况分子如果大于1，分母要变为复数．要结合语境选择合适用法．

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