题目

汽车以20m/s的速度匀速运动，刹车后加速度大小为5m/s2，那么刹车后2s内和刹车后5s内汽车的位移大小之比为A.1:1             B. 4:5            C.3:4              D. l:3  答案：C解析:略 You can hardly avoid ______ her if you work in the same office.A. hiding B. meeting C. to hide D. to meet