情景交际。

A: Hello, is that Wu Bin speaking?

B: Yes. Who's that?

A: This is Tian Hong. Are you free this Saturday evening?

B:    (1)  

A: I've got two tickets to Jay Chou's concert.    (2)  

B: Certainly, I'd love to. He's my favorite singer. It's very nice of you.    (3)  

A: Let's meet at the gate of the park at four o'clock.

B:    (4)   I want to buy him a gift.

A: OK. I'll get there at three. Shall we go to the shopping center to buy the gift?

B:    (5)   See you then.

A: See you.

A: Would you like to go with me?          

B: Sounds good.

C: When and where shall we meet?          

D: I'll see a movie.

E: Could you please get there earlier?      

F: Yes. What's up?      

废油再生时使用硫酸作再生剂的作用是什么？分析影响硫酸再生效果的主要因素？