①方程 $x^2+3x+2=0$ 是倍根方程；②若方程 $\left(x-2\right)\left(mx+n\right)=0$ 是倍根方程，则 $m+n=0$ ；③若点 $\left(p,q\right)$ 在反比例函数 $y=\frac{2}{x}$ 的图象上，则关于 $x$ 的方程 $p{x}^2+3x+q=0$ 是倍根方程；④若方程 $a{x}^2+bx+c=0$ 是倍根方程，且相异两点 $M\left(1+t,s\right)$ ， $N\left(4-t,s\right)$ 都在抛物线 $y=a{x}^2+bx+c$ 上，则方程 $a{x}^2+bx+c=0$ 的一个根是 $\frac{8}{3}$ ．

阅读理解
   The best thing about going to school is learning how to read. Books are great friends. They can help you to learn about anything you want to know. They can go anywhere with you. You can read about animals, faraway places, people, and anything else.
   Books are written by people called authors(作者). Authors think of things they want to write about. They make a plan for a book and start to write .Some authors write books that give us information(信息)and teach us things. Authors are very important people because they help us learn. Find a good book to read and read every day ,You will enjoy your time with a good book.

按课文《搭石》内容填空。

每当上工，下工，一行人走搭石的时候，动作是那么协调有序！前面的抬起脚来，后面的____上去，____的声音，像____的音乐；清波____，人影绰绰，给人____的美感。