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, they 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?