题目

__ , she knew she'd never been there before.     A. As familiar it seemed to herB. As it seemed familiar to her     C. As familiar as it seemed to herD. Familiar as it seemed to her   答案：D跳水运动员跳水时，运动员对跳板有一个向下的力，跳板同时也对运动员有一个向上的力，这说明物体间力的作用是相互的物体间力的作用是相互的；但这两个力的作用效果不同，前者的作用效果是改变物体的形状形状，后者的作用效果主要是改变物体的运动状态运动状态．