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  3. Most people who travel long distances complain of jetlag. Jetlag makes business travelers less productive and more prone【C1】____

Most people who travel long distances complain of jetlag. Jetlag makes business travelers less productive and more prone【C1】____

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问题     Most people who travel long distances complain of jetlag. Jetlag makes business travelers less productive and more prone【C1】______making mistakes. It is actually caused by【C2】______of your "body clock"-a small cluster of brain cells that controls the timing of biological【C3】______. The body clock is designed for a【C4】______rhythm of daylight and darkness, so that it is thrown out of balance when it【C5】______daylight and darkness at the wrong times in a new time zone.
    The【C6】______of jetlag often persist for days【C7】______the internal body clock slowly adjusts to the new time zone. Now a new anti-jetlag system is【C8】______that is based on proven【C9】______pioneering scientific research.
    Dr. Martin Moore-Ede has【C10】______a practical strategy to adjust the body clock much sooner to the new time zone【C11】______controlled exposure to bright light, The time zone shift is easy to accomplish and eliminates【C12】______of the discomfort of jetlag. A successful time zone shift depends on knowing the exact time to either【C13】______or avoid bright light. Exposure to light at the wrong time can actually make jetlag worse. The proper schedule【C14】______light exposure depends a great deal on【C15】______travel plans. Data on a specific flight itinerary and the individual’s sleep【C16】______are used to produce a Trip Guide with【C17】______on exactly when to be exposed to bright light. When the Trip Guide calls【C18】______bright light you should spend time outdoors if possible. If it is dark outside, or the weather is bad, 【C19】______you are on an aeroplane, you can use a special light device to provide the necessary light【C20】______for a range of activities such as reading, watching TV or working.
【C7】
选项 A、while
B、whereas
C、if
D、although
答案A
解析
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