题型:问答题 简答题 —Why do you look worried?—There are so many problems_______.[ ]A. remaining to settle B. remained settlingC. remaining to be settled D. remained to be settled 查看答案
题型:问答题 简答题 A、B两地相距1350米,甲和乙分别从A、B两地出发,相向而行。已知甲的速度为4千米/小时,乙的速度为5千米/小时,1分钟后两人调头反方向而行,再过3分钟,两人再次调头反方向而行,依此类推,再过5、7、……(连续奇数)分钟调头而行,请问,出发多少分钟后两人才能相遇( )A.9B.25C.49D.81 查看答案