A、After midnight. B、After she goes swimming. C、When she’s bored. D、When she can’t concentrate. C[B]、[C]、[D]均涉及到女士的行为活动，而[A]却未涉及到

W: What a great day, don’t you think?
M: I guess so. I hadn’t noticed. 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 better 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 TV. You know, it can take 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 part 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.
Questions 19 to 22 are based on the conversation you have just heard.
19. When does the woman normally watch TV?
20. Why was the man upset?
21. Why did the man feel disgusted with himself?
22. According to the woman, what happens to the brain while watching TV?