A、It is interesting. B、It often calls for sleep. C、It demands much of discipline. D、It admits only students of the class. A

M: Hi Margaret!(l)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 feelings of hunger!
M: I never had that problem! So where were you?
W:(1)My political science class ran overtime.
M: That happens quite a bit lately, doen’t it?
W: I guess so.(2)Actually what happens is that a bunch of us hang around for a while after class to talk with our professor and ask him questions.
M: Who is this 20th century philosopher?
W: Professor Taylor. Have you heard of him?
M: Hmm. He does have a good reputation in the political science department.
W: And a well-deserved one!(3)The same students who fall asleep in discussion groups 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’s not only interesting, but prepares to give up time for students.
M: I know. They’re a rare type! Maybe I should sit on his class sometime. Do you think he’d care?
W: Not at all. Lots of students bring their friends, and he says he feels pleased.
M: Hmm. I think I’ll do that next week.