【題目】About ____of the students in Grade Nine this year were born in the_____.

A. three five; 1996 B. three fifths; 1990s

C. third fifth; 1997. D. third fifths; 1990s

【答案】B

【解析】分?jǐn)?shù)的構(gòu)成為分子用基數(shù)詞，分母用序數(shù)詞，分子如果大于1，則分母序數(shù)詞一般都用復(fù)數(shù)形式，故用排除法只能選B項。

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