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  3. Most people who travel long distances complain of jetlag. Jetlag makes bus

Most people who travel long distances complain of jetlag. Jetlag makes bus

游客2023-11-21  17
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. [br] 【C7】
选项 A、while
B、whereas
C、if
D、although
答案 A
解析 while意为“当……的时候，和……同时；而，然而；虽然，尽管"；whereas作“然而，但是，尽管”讲；if意为“假如，如果；是否”；althou8h作“虽然，尽管”讲。根据题意，这里需要一个表示转折和对比的关联词，例如:English and French are living languages while Latin is dead．英语和法语是现在仍有人说的语言，而拉丁语现在却没有人说了。Before liberation，the working people labored for the l
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