下列说法不正确的有（）个．①的倒数是a，a的倒数是；②如果y

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下列说法不正确的有（　　）个．
①的倒数是a，a的倒数是；
②如果y=，那么x与y成正比例．
③一个分数的分母如果只含有质因数2和5，这个分数就能化成有限小数．
④小明所在班级同学的平均身高为1.40米，小强所在班级同学的平均身高是1.50米，可以肯定小强比小明高．

A．1

B．2

C．3

D．4

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