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 他們告訴我們,他們學(xué)校大約五分之三的教師年齡在40歲以下.

解答 答案:C.考查分?jǐn)?shù).句意"他們告訴我們,他們學(xué)校大約五分之三的教師年齡在40歲以下.".分?jǐn)?shù)通常用"基數(shù)詞+序數(shù)詞"表示.如果分子大于1,分母要變?yōu)閺?fù)數(shù).因此答案是C.其它不正確.

點(diǎn)評(píng) 英語分?jǐn)?shù)的表示法,用"基數(shù)詞+序數(shù)詞"表示.通常情況分子如果大于1,分母要變?yōu)閺?fù)數(shù).要結(jié)合語境選擇合適用法.

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