如下表，为几种物质的沸点，如果在标准大气压下用降温的办法从空气中提取这些气体，那么温度下降时首先液化被分离出来的是（　　）

A．氧气

B．氮气

C．二氧化碳

D．所有气体一起被液化，无法分离

 完成句子。

A: Hello, Jane! I'm making a survey. __1__

B: Sure.

A: __2__?

B: I think I'm creative and outgoing.

A: __3__?

B: I would give my students less homework.

A: Good. What would you do if your teacher asked you to give a speech in front of the whole

    school?

B: I'd say yes.

A: Well, what would you do if your friends were in trouble?

B: __4__.

A: Wow, you are pretty confident and helpful. __5__.

B: You're welcome.