①模拟实验  ②化石研究   ③进行比较   ④科学推测．

选出相对应的答语。

①Do you like this shirt? ____       A. It's green.

②What do you have? ____          B. No. It's soft.

③What colour is it? ____             C. Yes, I do.

④Is it hard? ____                         D. I have a dress.

⑤What do you need? ____          E. I need a sweater.

如图，铁路上A、B两点相距25km，C、D为两村庄，DA⊥AB于A，CB⊥AB于B，已知DA=15km，CB=10km，现在要在铁路AB上建一个土特产品收购站E，使得C、D两村到E站的距离相等，则E站应建在距A站多少千米处？

计算

（1）${\left(-1\right)}^{2006}+{\left(-\frac{1}{2}\right)}^{-2}-{\left(3.14-\mathrm{\pi }\right)}^0$

（2）$\frac{2014}{{2013}^2-2012\times 2014}$．

A smile _________ nothing, but gives much.