根据对话理解，选择最佳答案填空。

A: 1 I help you?

B: Yes, please! I 2 a T-­shirt.

A: A T-­shirt? What 3 do you want?

B: Red.

A: Have a look 4 this one! It's on sale.

B: Oh, it's really nice, 5 it is too short, can you give me a 6 one?

A: Ok! How about this red one?

B: En……, it's great! I like it! How much 7 it?

A: 25 dollars 8.

B: That's good. I'll 9 it.

A: Here you are!

B: Thank you 10!

在各种海洋污染中，对海洋生物危害最大的是（　　）