题目

登月宇航员从月球带回一块矿石，这块矿石不变的是 A.质量                                                             B.重力 C.温度                                                                   D.位置 答案：Av. 用所给单词的正确形式填空              save， with， I， important， exercise1. The policeman only thought about lives.2. He has a sore back because he sits in the same way for too long moving.3. I hurt playing soccer.4. The book talks about the of making good decisions.5. is good for our health.