【正确答案】 D

【答案解析】[听力原文] 19-22
W: Hi, Jack. Tomorrow's the big day! You must be excited about going to France for your first international conference.
M: The trip, yes, but not the preparation.
W: What do you need to do except pack?
M: You know, you always feel so awful whenever you make a big change in time zones. This time I'm trying an anti-jet-lag program so I'll be alert even for the first day's lectures.
W: But how can you avoid jet lag? With that late flight and a six-hour difference in time, it's bound to take you a couple of days to adjust.
M: Well, this program's supposed to get your body to feel like it's in the new time zone before you leave. The theory is that the food you eat actually tells your body when to be active and when to be restful, so changing your diet can help you be ready for the time change. You have to alternate feasting and fasting...you know, sometimes eat a lot, sometimes just a little.
W: OK. Now I see why you're not enjoying the preparation. I can't quite picture you fasting!
M: Actually the worst is already over. Two days before the flight, you're supposed to have only light meals and limit yourself to 800 calories.
W: That must have been tough.
M: Yeah, but I'm making up for it today. Feast day is much better...though I still don't get to eat any snacks after dinner.
19．What is the conversation mainly about?

[听前预测] 预览四道题的选项，由traveling, different time zone, appetite等可推知，对话很可能与旅行有关，涉及到旅行期间的饮食、准备、时差反应等问题。
[解析] 对话中男士提到I'm trying an anti-jet-lag program…(我正在试反时差症的项目)，女士产生疑问：But how can you avoid jet lag?，然后双方都围绕这个话题展开。由此可知，对话讨论的是如何解决时差的问题，故答案为[D]。jet lag意为“飞行时差反应”。
[点睛] 选项中的food, Adjusting, time changes等在对话中均有所提及，故听音时应注意抓住其中的主要信息，避免被只言片语蒙蔽。

【正确答案】 B

【答案解析】[听力原文]
How is the program that Jack is using supposed to work?
[解析] 选项中的It changes, It builds, It tricks, It promotes等表明，本题考查It对人体产生的某种影响。由对话中。男士提到的this program's…get your body to feel like it's in the new time zone(这项计划是使人在出发前身体就感觉处在新的时区内)，故答案为[B]。
[点睛] [B]是对对话的get your body to feel like it's in the new time zone的同义转述。

【正确答案】 C

【答案解析】[听力原文]
Why isn't Jack enjoying the preparation for his trip?
[解析] 选项中的He, feels rushed, hates to pack, doesn't like等表明，本题可能考查男士不乐意做旅行准备的原因。根据对话中男士说的have to alternate feasting and fasting…sometimes eat a lot, sometimes just a little(得大吃和节食交换着)和女士的回应Now I see why you're not enjoying the preparation(现在我知道你为什么不愿意做准备了)可以推断，男士不喜欢做准备是因为不乐意控制饮食，故答案为C。

【正确答案】 A

【答案解析】[听力原文]
What can be inferred about Jack's usual eating habits?
[解析] 选项中的He, big appetite, eats only等表明，本题考查He的饮食习惯。对话中女士提到的I can't quite picture you fasting(很难想象你会禁食)，男士所说的limit yourself to 800 calories和女士的反应That must have been tough都表明，男士通常都吃得很多，故答案为[A]。
[点睛] 通过女士所说的话推断男士的饮食习惯是解决本题的关键。此外，联系上题也可推断出本题答案。