听力原文：W: Hey, Jake, rise and shine.
M: What time is it, Shelly？ I have no idea how long I've been here.
W: Hmm... the library is too quiet. You need a place that's nice and noisy to study.
M: You've got a point. I always mean to study hard but I quickly nod off. It's just too quiet here.
W: Maybe you were thinking of Professor Carlson's psychology lesson. That's as good as a sleeping pill.
M: Yeah, nice guy, but he just can't seem to come down to earth. The whole time he seemed to be talking to himself.
W: You should have been in my history class with Professor Rivers. What a trip! One student got up and challenged him to name six women who contributed to the American Revolution. He was speechless.
M: The class must have been buzzing.
W: Especially when the student started rattling off over a dozen names. She was no fool and she wasn't going to let him off the hook.
M: Seems she gave Professor Rivers a good lecture.
W: Yeah, although I felt she should have given him a chance to save some face. After all I doubt whether many people can name even one.
M: That's true. I sure can't.
W: Jake, Jake. You should attend Professor Anderson's class on women's studies.
M: Hmm... Maybe Rivers could join me.
(1)

A. He was studying.
B. He was making noises.
C. He was nodding off.
D. He was looking for a book.