A、Have a lot of exercises. B、Stay in a good mood. C、Have a healthy diet. D、Get enough sleep. C细节题。男士问女士如何保持体型，女士说第一件应该做的事情就是保持健康

M: Hi, Jane, you are a different person now. How’s it going?
W: The training is useful, and I learned much about how to keep fit.
M: Really? Tell me about it. You know, I haven’t been to the club for a long time because of the busy work.
W:[20]The first thing we should do is to have a healthy diet. The more fruits you eat, the better your skin appears.
M: The same thing with vegetables, right? Everybody seems to know that. There is something else?
W: Yeah, I’m not sure you’ve heard that a sound sleep is crucial for fitness.
M: I’ve heard that. Does your trainer tell you anything about staying in a good mood?
W: Exactly. A good sense of humor can help your metabolism work better.
M: That’s the same old things. But they are very important, if you want to achieve your goals.
W: Yes, that’s the way to go. It’s also important to do proper exercise.
M: Right, too much or too little wouldn’t be effective. Have you learned anything else?
W: There is one. The trainer asks us to buy more skin care products.
M: Are you kidding? My trainer has never said that to me. He always advises people against such kinds of things.
W: But my trainer does. He says women tend to show their age earlier than men. They get wrinkles on their faces easier. So they really need something to delay the process.
M: That makes sense. Following these rules, I think you will be right on your track.
W: Yes. Right now nothing can stop me!
19. Why does the man say the woman is different now?
20. What does the woman say is the first thing people should do to keep fit?
21. Why does the woman’s trainer ask them to buy more skin care products?