力是一个物体对 的作用，不能离开 物体或 物体而独立存在，人推车向前走，人推车子的力：施力物体是 ，受力物体是 ．
另一个物体；施力；受力；人；车子
下列哪项不属于城市环境卫生设施规划的主要任务和内容（）
A.测算城市固体废弃物产量
B.提出垃圾回收利用的对策
C.确定垃圾转运站的位置
D.进行垃圾处理场总平面布置
词型转换。
1. We are going to _______ (work) on a farm tomorrow.
2. Where _______ you often _______ (do) your homework?
3. What time _______he _______ (go) to work every morning?
4. Is she going ________ (play) basketball this afternoon?
5. Look! Li Lei _______ (swim) in the river.
6. Why don't you _______ (come) to my house?
