两个正方形的边长比是2：3，它们的面积比是______．

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问题填空题

答案

设它们边长分别为2和3，

则面积分别是2×2=4和3×3=9，

所以它们的面积比是4：9；

故答案为：4：9．

单项选择题

A．(A) A diet with meat only is not enough for our body.

B．(B) A diet with vegetables can sometimes be very costly.

C．(C) Meatless meals are equally nutritious and less expensive.

D．(D) Meatless meals cannot provide all the essential nutrients.

单项选择题

MAU.Prevalence.in.Asia中国2466例2型糖尿病合并高血压患者，MAU检出率为多少（）

A.0.23

B.0.33

C.0.43

D.0.53