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1.【2015·重庆】B Imagine the first days in a new time zone. Slow to respond to the 28 , your body clock is confused. You’re sleepy all day, but when it’s time for bed, you can hardly fall asleep. Obviously you are 29 jet lag（时差反应）. Travelers have traditionally fought this 30 with sleeping pills or alcohol. There are actually healthier ways that can work just as 31. For example, the moment you get on the airplane, start 32 your biological block to the destination’s time. If it’s daytime in your destination, try to stay 33 . Walking around the cabin（客舱） can be of help. When it’s nighttime, try to sleep. In that case, eat before the flight, 34 an empty stomach will prevent you from sleeping. These tips will help you start a new 35of sleep and wakefulness. 28. A. flight B. change C. demand D. climate 29. A. suffering from B. working on C. looking into D. leading to 30. A. danger B. problem C. waste D. fear 31. A. briefly B. slowly | 
