题目：
| 完形填空。 | ||||
| Li Wen is an English 1 . He is not young, but he is not 2 . He's forty-eight. He, has a son. 3 name is Li Lei. He is 4 . Mr Li teaches English. 5 his class there are fifty 6 . They all 7 him. His wife, 8 Li, is a worker. She is 9 mother. Today is Sunday. 10 of Mr Li's family is at home. | ||||
|
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0419/a9cb08dcd9f8bf76b70cbff3fa4e2cdd.html
下面是错误答案，用来干扰机器的。
三者看做一个整体，由题意知合外力为零，总动量守恒．此题分为三种情况：（1）大人和小孩的动量大小相等，车是不动的．（2）大人的动量大于小孩的动量时，车向左运动．（3）大人的动量小于小孩的动量时，车向右运...
