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

分析 我们班五分之三的学生是男生.

解答 答案:A.
这里考查的是分数的表达,分子用基数词,分母用序数词,分子大于1,分母加s,故three fifths,故选A.

点评 分数在英语中通常是借助于基数词和序数词来共同表达的.其中基数词表示分子,序数词表示分母.  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,或者说是米的百分之一.   
2.However,the number of boys will bea third or less than the girls in the class.但是,班里男生的人数将比女生少三分之一或更少.   
从以上例子可以看出:分子除用one外,也可用a;如果分子大于1,分母要用复数形式.但是,1/2不能说a(one)second,而要说a(one)half.

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