题目

Why do we have to ________ Joan’s selfish behavior? She should learn to care for others. A. keep up with         B. catch up with        C. put up with        D. come up with 答案：C 解析: 略19．一辆大巴车从东村出发，如果每时行60千米，4时就可以到达西村．实际上只用了3小时就到达了，这辆车的实际速度是多少？