选择合适的句子补全对话。

Lucy: Do you want a pen friend?

Sam: Yes,

Lucy:

Sam: Yes, I like China very much.

Lucy:

Sam: Yes, of course. It's very famous.

Lucy: Can you tell me more about China?

Sam: Yes.

Lucy:

Sam: They always have a big dinner.

A. Do you want to go to the Great Wall? B. Can you speak Chinese? C. The Spring Festival is an important（重要的）festival in China. D. I want a Chinese pen friend. E. What do they do at the Spring Festival?