题目

词汇;根据句意及首字母提示补全单词。 1.Soccer is p___________ all over the world. 2. Lu Xun was a very f__________ writer. 3. He is going to be a scientist in the f_______. 4. Li Ming p________ playing the piano to playing the guitar. 5. Tom skates q_______ a lot. 6. Lily is i______and she can’t come here today. 7. Can you p______ me the book? 8. Don’t t_________ the bottles around. We should keep the room clean. 9. Tony’s f__________ sport is basketball. 10. Let’s take p______ in the football game.质量m=5 kg的物体在恒定水平推力F=5 N 的作用下，自静止开始在水平路面上运动，t1=2 s后，撤去力F，物体又经t2=3 s停了下来.求物体运动中受水平面滑动摩擦力的大小.