根据所提供的情景，选择相应的句子。

1. 你想知道对方是否会拉小提琴，可以说：   [ ]

A. Shall we play the violin?            

B. Do you play the violin?

C. What about the violin?

2. 你夸奖对方的吉他，可以说：    [ ]

A. This is my guitar.                  

B. How nice the guitar is!

C. I'd like your guitar.

3. 你想问别人会玩什么，你可以说：[ ]

A. Can I help you?                    

B. What do you play?

C. What do you like?

4. 林涛问你是否会弹钢琴，你不会说：[ ]

A. Yes, I can.                        

B.   No , I'm  Lin  Tao.

C. No, I can't.

5. 你想问别人是否喜欢足球，可以说：[ ]

A. Look at the football.              

B. Do you play the football?

C. Do you like the football7

6. 请求别人一起踢足球，可以说：[ ]

A. What do we play?                

B. Do you like football?

C. Shall we go and play football?

油环起什么作用？常用的气环有哪几种类型？