题目

如图为球拍击打网球瞬间的照片，根据图中网面凹陷的现象，说明力可以改变物体的_____：根据网球被击打后减速并反弹回去的现象，说明力可以改受物体的_____。 答案：【答案】形状 运动状态 【解析】图中网面凹陷的现象，说明力可以改变物体的形状；网球被击打后减速并反弹回去，其速度大小和运动方向发生变化，该现象说明力可以改受物体的运动状态。—Tom is an excellent boy. Everyone likes him. —Yes, his parents are very              of him. [     ]A. proud B. afraid C. nervous D. clear