--- How many students are there in your class? --- Forty，and ________ of us are girls.
A．three fifthsB．three fifthC．third fiveD．third fifths
A

試題分析：句意：你們班上有多少學(xué)生？40個，五分之三是女生。分?jǐn)?shù)的表達(dá)，分子用基數(shù)詞，分母用序數(shù)詞，如one third1/3；當(dāng)分子大于一時，分母要用復(fù)數(shù)形式，如two thirds；結(jié)合題意故選A。
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