【正确答案】 B

【答案解析】[听力原文]
   W: Mr. Kim. Lots of people are suffering from being unable to sleep, including me.
   M: Well, you must be feeling bad, twisting around, and trying to find a comfortable position. But you're probably only making matters worse.
   W: Really. I thought changing positions would help.
   M: That's not right. What happens is that your heart rate actually increases, making it more difficult to relax. You may also have some bad habits that contribute to the problem.
   W: Really? Like what?
   M: Do you rest frequently during the day? Do you get virtually no exercise, or do you exercise too much late in the day? Do you sleep a lot or sleep late on weekends?
   W: You're talking about me! I'm leading a life like that. I guess lots of people do like this.
   M: Haha! Any of these facts might be leading to your insomnia by disrupting your body's natural rhythm.
   W: What should we do then on those sleepless nights? Should we take some sleeping pills?
   M: Don't bother with sleeping pills; they can actually cause worse insomnia later.
   W: I thought sleeping pills would help. What're your suggestions for our audiences?
   M: The best thing to do is to drink milk or eat cheese or tuna fish. They are all rich in amino acid that helps produce a substance in the brain that induces sleep. This substance will help you relax. And you'll be on the way to get a good night's sleep.
   W: I'm so excited to hear all this. I guess many of us will change our way of life since they have listened to our talk.
   M: Your sleeping will become better and better if you insist.
   W: I'm sure I will! Thank you much for your advice and thanks for joining us this evening!
   M: It's my pleasure.
   According to the man, what happens when you turn and twist to get comfortable?