听力原文：M: Hi, Susan. Where were you at lunchtime? I was saving a seat for you in the cafeteria. W: Oh, sorry to miss you, but my thirst for knowledge was greater than my pangs of hunger. M: I never had that problem. So where were you? W: My political science class ran overtime. M: That's been happening quite a bit lately, hasn't it? W: I guess so. Actually what happens is that a bunch of us hung around for a while after class to talk with our professor and ask him questions. M: Who is this 20th century Socrates? W: Professor Hall. Have you heard of him? M: Mm. He does have a good reputation in the Political Science Department. W: And a well-deserved one. The same students who fall asleep in discussion groups and in seminars fight for front-row seats in his lectures. M: Oh, no. I hope this isn't catching. W: You can joke. But it's great to have a professor who is not only interesting but prepares to give up time for students. M: I know. There I really agreed. Maybe I should sit in on his class sometime. Do you think he'd care? W: Not at all. Lots of students bring along their friends and he says he feels flattered. M: Well, just to be safe, I think I'll bring my lunch along as well. W: I'll make a good student of you yet. (20)