情景交际，选择适当的选项补全对话。

　　a.I think they will discover life in space one day.

　　b.Doyou know anything about spacecraft?

　　c.Is China the first country to send spacecraft into space?

　　d.They sent two men into the moon.

　　e.Have they discovered any life in space?

　　f.On the moon.

　　g. I think they are too far away.　　

A.Daming, are you interested in the universe?

B:Yes, I am.

A:

B:Yes.I have just read an article about Shenzhou Ⅶ. It flew into space in 2008.　　

A:　　

B:No.The USA and the former Soviet Union (前苏联) sent their spacecraft into space many years ago.　　

A:　　

B:No,not yet. But some spacecraft have gone beyond the solar systems.　　

A:Then you think we are not alone? Why has no one from other planets sent us a message?　　

B: