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  3. (厦门大学2014年试题) Most people who travel long distances complain of jetlag (喷气飞行时差反应). Jetlag makes business travelers less produ

(厦门大学2014年试题) Most people who travel long distances complain of jetlag (喷气飞行时差反应). Jetlag makes business travelers less produ

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问题 (厦门大学2014年试题)
   Most people who travel long distances complain of jetlag (喷气飞行时差反应). 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 time 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 (旅行路线)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.
【C19】
选项 A、or
B、and
C、but
D、while
答案A
解析 正确解答本题需要正确理解本文最后一句，特别是if从句的语义关系：两个or引述三种不易接触亮光的情况：外面天已黑、天气不好或在飞机上。
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