题目

我们在平直路面上骑自行车匀速前进，这时车的动力跟    互相平衡，当停止踩踏板后，自行车仍能继续向前滑行，这是因为自行车具有     ． 答案：阻力;惯性15、---What do you think of Peter? ---He ______ be really difficult to get along with even though he’s a nice person in general. A. shall            B. should                C. must                  D. can