A、She is under 20 years old. B、She is in her 20s. C、She is under 30 years old. D、She is in her 30s. D推理判断题。对话中女士说自己在30岁时就开始变胖了。由

M: Hi, Helen! Nice to see you again.
W: Yes, it’s been a while. Hey, you’ve gotten bigger since the last time I’ve seen you.
M: Yeah, (19)ever since I got married, I’ve been putting on weight. My wife’s a good cook.
W: You need to start exercising again. Have you thought about joining a health club?
M: I have. But they are expensive. And I don’t have the time.
W: I’m a member at Spa Fitness and you’d be surprised at how inexpensive a year membership is. Most of the members are "normal" people who work out for about an hour just three times a week.
M: Sounds reasonable. I mean, you look skinny enough.
W: Well, to tell the truth, I haven’t always been this lean. (20)After I turned 30, I started putting on the pounds. I couldn’t fit into my favorite skirts any more and I didn’t have any energy. So I decided to do exercise. Once you start on a regular exercise program, you start feeling better immediately.
M: Is that right? I read that Americans are getting fatter. In fact, the average American teen is 10 to 20 pounds heavier today than in the 1980s. I’m amazed at how many fat teenage girls I see.
W: That’s because of lifestyle changes. Health clubs aren’t just for beautiful people. Actually, the majority of the members are trying to lose weight like us. So will you join me for a workout? (21)I can get you in free tonight with a guest pass.
M: Why not? I’ve got nothing to lose.
W: Nothing but a few pounds.
19. Why does the man put on weight?
20. What can we infer about the woman?
21. How can the man get into the health club tonight?