题目内容

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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