2. 外语
  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 re- search. 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 times 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 light 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.
【C11】
选项 A、at
B、through
C、in
D、as
答案B
解析 through可以作“以，用，凭借，经由”讲，符合题意，例如：Passengers can speak to their friends on shore through wireless telephone．乘客可以通过无线电话和岸上的朋友通话。Look，the child is peeping at us through the curtain．看啊!那孩子正在帘子后面偷看我们呢。He felt faint through lack of food．由于没有进食他感到虚弱无力。I read throu
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