【正确答案】 C

【答案解析】[听力原文]16-20
Do you have trouble sleeping at night? Then maybe this is for you. When you worry about sleeping and twisting around, trying to find a comfortable position, you're probably only making matters worse. 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. Do you rest frequently during the day? Do you get virtually no exercise, or do you exercise strenuously late in the day? Do you think about sleep a lot or sleep late on weekends? Any of these facts might be leading to your insomnia by disrupting your body's natural rhythm. What should you do then on those sleepless nights? Don't bother with sleeping pills, they can actually cause worse insomnia later. The best thing to do is to drink milk or eat cheese or tuna fish. They are all rich in the acid that helps produce a neural transmitter in the brain that induces sleep. This neural transmiter will help you relax, and you'll be on the way to getting a good night's sleep. Until tomorrow's broadcast, this has been another series "Hint for good health" by Doctor Handson.