听力原文：M: What's that book you just picked up？W: The sociology text professor Smith uses

听力原文：M: What's that book you just picked up？

W: The sociology text professor Smith uses in his course.

M: You had better read it if you want to pass the course. Smith swears by it.

W: But it costs 40 dollars. I simply can't afford it.

M: Did you check the used book section here？ Maybe they have it.

W: No, hey don't. I asked.

M: Why don't you get it from the library？

W: Are you joking？ I've been trying for months and it's always out. There are more than 45 students in the course and every single one wants the book.

M: Listen, you know my roommate, Henry, don't you？ He took the same course last year and I believe he owns the book. I'll ask him if he'll lend it to you.

W: Oh, Tom, that would solve everything.

Why doesn't the woman buy the book？

A．Because it' s too expensive to buy it.

B．Because she doesn't need it.

C．Because she can' t buy it everywhere.

D．Because she already has got one.