读句子，选答语。

(     )1. Can I help you?

(     )2. What size?

(     )3. Are they nice?

(     )4. How much are they?

(     )5. Are they all right?

A. Yes, please.

B. They're thirty yuan.

C. Size seven.

D. Yes, they are.

E. Yes, they are very nice. I like them.

断层油气藏形成的基本条件。