【題目】About _______ of the students in our class were born in the _______.
A.two-fifths; 1990s
B.two-fifths; 1990
C.two-fifth; 1990s
D.two-fifth; 1990

【答案】A
【解析】句意：我們班大約五分之二的學(xué)生出生在２０世紀(jì)９０年代。分?jǐn)?shù)的表達法：分子基數(shù)詞，分母序數(shù)詞，分子大于一，分母用加-s，所以五分之二是two-fifths；in the 1990s在２０世紀(jì)９０年代。故選A。

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