听力原文：M: Hi, Susan. Where were you at lunchtime？ I was saving a seat for you in the caf

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)

A．In the late rooming.

B．Immediately after lunch.

C．In the mid-afternoon.

D．After the evening meal.