听力原文：M: Did you see the list of books for this course？W: Yes, Dr. Downs said he expect

听力原文：M: Did you see the list of books for this course？

W: Yes, Dr. Downs said he expects us to get the first five on the list. He is going to discuss them in detail.

M: Arc you going to buy them？

W: I don't know. These books are expensive. And I don't have a lot of money on me.

M: How about sharing them with me？

W: Sounds good.

M: Let's do this. I will buy three and you buy two of them.

W: I would rather do it this way: we pay fifty-fifty for the books now. And at the end of the course you can take the books you find more interesting and I will take the ones I like.

M: What if we both like the same books？

W: Come on, we are not going to argue over that. Are we？

M: I was just joking. It's definitely a better idea.

W: Then let's get the books as soon as possible.

What are these people concerned about？

A．Dr. Downs' health.

B．The books they have to buy for their course.

C．The man's proposal.

D．Fifty dollars.