补全对话(选择)。

A: Can I help you?

B: Yes, please.____

A: For your daughter? Look, the shoes are really nice. Do you like them?

B: Yes. But I'm afraid my daughter doesn't like the color.____

A: Sure. There are different kinds of shoes over there. What color does she like?

B:____ And black is her favorite.

A: What size does she need?

B: Size 9. Let me see. Um, this pair of shoes looks nice. They are OK with her.____

A: They are only 99 yuan.

B:____ Here is the money. Thanks a lot.

A: You are welcome.

 A. I'll take them.

 B. Can you go to other shops?

 C. I'm sorry about it.

 D. May I have a look at the other shoes?

 E. How much are they?

 F. I need a pair of shoes for my daughter.

 G. She likes white and black.

一颗图钉尖的面积是5×10^-8m²，图钉帽的面积是0.5×10^-4m²，手指对图钉的压力为20N，求：

读长江水系略图和长江干流纵剖面图，完成下列各题。