下列哪些现象属于必然现象 A．种瓜得瓜，种豆得豆 B．要自由就要遵守纪律 C．既有

选择句子，补全对话，其中有两项是多余的。
A: Hi, Zhou Qiang. Haven’t seen you for too long!  小题1: 
B: I’ve just been to the Three Gorges (三峡).
A: Really?   小题2: 
B: Right. As you know, we’ve built a great dam (坝) across the Changjiang River.
A:   小题3: 
B: Yes, the dam is stopping water these days. And the water is rising 2 meters every day until it is 135 meters high.
A: Oh, it’s said the beautiful scenery (风景) of Kuimen will be under water. What a pity!
B:   小题4:  It has been copied in another place with some other places of interest.
A: Great！I want to go to the Three Gorges this summer. Would you like to go there with me again?
B: I’d love to!  小题5: 

A.Is the dam beginning to work? B.But I haven’t been there yet. C.Don’t worry. D.Is it hard to build the dam? E.Where have you been? F.It’s reported that it has changed a lot. G.We’ll see a new Three Gorges then.