补全对话。
A: (1)_________, Tony? I haven't seen you for a long time.
B: Oh, I've been to Dalian. It's one of the best cities in China.
A: (2)________?
B: Of course. The best thing there was swimming. It's really cool.
A: (3)______?
B: It's a beautiful city! I've never seen such a beautiful beach in my life.
A: (4)_______?
B: Fro only a week. I wish I could stay there and enjoy sunshine forever.
A: Really? You know, I'm a member of Green China. I want to know something
about the environment there. (5)_______?
B: No. nobody littered things. People always keep rubbish in a bag until they can put it in a dustbin.
A: Well, that's great. I'll go there if there is a chance for me.
与
互为同位素