听力原文：W: What a great day, don't you think？
M: I guess so. I hadn't noticed it. I feel awful because I watched television until after midnight last night.
W: After midnight! Did you watch so late because you were bored？ I usually watch TV only if I have nothing to do.
M: Bored？ No, I was upset because I left my meal tickets in the cafeteria. That's more than fifty dollars worth of meal tickets down the drain.
W: So did watching TV make you feel better？
M: Well, I felt a bit better while I was watching. You know, it took my mind off my troubles. But after I turned the TV off, I just felt disgusted with myself for wasting so much time.
W: I've had that feeling before.
M: I had intended to watch just one program, but somehow I couldn't make myself switch off the TV.
W: Actually, I've read that there's a scientific explanation for that. It seems that there's a part of the brain that processes complex information, but that part becomes less active while watching TV.
M: That's certainly how I felt last night—like my brain wasn't very active.
W: That's not the worst of it. If you watch TV a lot, or for a long time, that part of the brain—the pan that processes complex information, shows lowered activity and you become more and more passive.
M: That's incredible.
W: Next time you feel upset, you should go swimming. That's what I do, and it always makes me feel better.
M: I suppose. Right now, I've got to go to the cafeteria and get some more meal tickets.
(20)

After midnight.
B. After she goes swimming.
C. When she is idle.
D. When there is a good program on.