【正确答案】 B

【答案解析】 [听力原文]
   M: And the second time?
   W: Oh, the second time I did manage to give up completely for a while. I was expecting... and the doctor advised me not to smoke at all. I went for about...seven or eight months...without a single cigarette.
   M: Then you took it up again.
   W: Yes... a couple of weeks after the baby was born. It was all right then because the baby was being bottle fed anyway.
   M: Good. That's interesting. So if you'd been breast-feeding you would have gone for longer without smoking?
   W: Definitely. It's what the doctors advise. Though not all mothers do as their doctors say...
   M: Now Mrs. Trump. When do you smoke most?
   W: Erm...When I'm sitting watching TV or...or...reading a book...but especially I'm with...when I'm in company. Yes...that's it...when I'm with friends. I never smoke when I'm doing the housework... never...There's always too much to do.
   M: Do you ever smoke at meal times?
   W: I always have...one cigarette after a meal. Never on an empty stomach, which reminds me—I must be going. My husband will be waiting for his lunch. And Keith...he's my son.
   M: Just one more question and that'll be all.
   W: Well if you insist.
   M: How would you describe the effect that smoking has on you?
   W: What do you mean?
   M: Well...Does smoking—for example—make you excitable...keep you awake...?
   W: Oh no—quite the contrary. As I told you before I smoke most at times when I'm most relaxed. Though quite honestly I...don't really know whether I smoke because I'm relaxed or...er...you know...in order to relax. Now I really must be off. Please excuse me. I see you're...you're carrying a tape-recorder. This won't be on the radio, will it?
   M: No, Mrs. Trump...I'm afraid not. But we do thank you all the same.
   W: Right. Goodbye.
   M: Goodbye, Mrs. Trump.
   What's true about Mrs. Trump's trying to give up smoking for the second time?
根据录音可知，女士第二次戒烟是因为她怀孕了，为了未出生的孩子考虑，有七、八个月完全不吸烟，但孩子出生以后又开始吸烟了。可见女士第二次戒烟的原因是B。A“因为第一次不成功”和C“她想为丈夫树立一个好榜样”与录音不符；D“她受经济困难所迫”与女士说过的saving up有相近之处，但不尽相符。且saving up是第一次戒烟的原因，而非第二次戒烟的原因，排除。