题目

填入一个适当的词补全对话，每空一词。A: Hi, Jack. Long time no see. How is everything【1】?B: My grandfather has been in hospital. I have been looking after him recently.A: Oh, I'm sorry to hear that. But what was he there【2】?B: Will...he fell down the stairs(楼梯) three weeks ago.A: Really? But how did that【3】?B: My grandmother asked him to buy some vegetables and fruit.【4】he went downstairs, because the floor was very slippery (滑的), he fell down.A: Can he stand on his feet now?B: Yes, he can move his leg. But【5】still has to stay in hospital for two or如图，A和B两个小机器人，自甲处同时出发相背而行，绕直径为整数米的圆周上运动，15分钟内相遇7次，如果A的速度每分钟增加6米，则A和B在15分钟内相遇9次，问圆周直径至多是多少米？至少是多少米？（取π=3.14）