每只小兔拔5个 ．

一个分数，分子扩大到原来的3倍，分母缩小为原来的 $\frac{1}{3}$ ，这个分数就（   ）

请认真阅读短文，从短文后各题所给的A、B、C、D四个选项中，选出最佳选项。

Can the time go slower?

— by Joanna Pitt

Can the time go slower?

I'm still thinking of

the answers.

Can the time go slower?

My head is not

yet clear.

Can the time go slower?

For me the rules of math are

too hard to remember.

Can the time go slower?

My grade is what my father

really cares about.

So can the time go slower?

My dear teacher,

I don't want to run behind others.

Oh no!

There are still lots of questions

to be answered!

如图，几块大小不等的正方形纸片无重叠地铺满了一块长方形．已知正方形纸片A的边长为7，求最小的正方形纸片的边长．

《旧唐书》称：武则天“制公卿之死命，擅王者之威力”（意为诛杀公卿，独断专权）。武则天遗言无字碑，由后人评价自己的功过。史学家之所以肯定武则天主要是因为（    ）