完成对话从方框中选择正确选项。(方框中有一个选项与对话内容无关)

A. I fell down from the stairs (楼梯). B. Do you have a sore back? C. What's wrong with you? D. Remember to put some ice on your knee. E. Let me have a look at it first. F. But you should get an X-ray.

A: Good morning!

B: I hurt my knee.

A: Your right knee?

B: Yes, I can't move easily.

A: Oh? Hmm, yes, it's swollen (红肿的). How did you hurt it?

B: .

A: I see. Well, I don't think it's serious. Let the nurse take you to the third floor (楼层) and come back with your X-ray. And then I will know if your knee is broken or not.

B: OK. I will.

(Ten minutes later)

A: Well, nothing seems to be broken. I think all you need is some rest.

B: OK, thank you, Goodbye.

A: Goodbye.