10.In our class  ______ of the students are boys.( 。
A.three fifthsB.three fifthC.third fiveD.third fifth

分析 我們班五分之三的學(xué)生是男生.

解答 答案:A.
這里考查的是分?jǐn)?shù)的表達(dá),分子用基數(shù)詞,分母用序數(shù)詞,分子大于1,分母加s,故three fifths,故選A.

點(diǎn)評(píng) 分?jǐn)?shù)在英語(yǔ)中通常是借助于基數(shù)詞和序數(shù)詞來(lái)共同表達(dá)的.其中基數(shù)詞表示分子,序數(shù)詞表示分母.  如:
1.The centimeter is one-tenth of the decimeter or one-hundredth of the meter.厘米是分米的十分之一,或者說(shuō)是米的百分之一.   
2.However,the number of boys will bea third or less than the girls in the class.但是,班里男生的人數(shù)將比女生少三分之一或更少.   
從以上例子可以看出:分子除用one外,也可用a;如果分子大于1,分母要用復(fù)數(shù)形式.但是,1/2不能說(shuō)a(one)second,而要說(shuō)a(one)half.

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