2. 外语
  3. A. while B. dark C. devised D. whereas E. specific F. agreeable G. regular H. stimulus I. disruption J. attain K. seek L

A. while B. dark C. devised D. whereas E. specific F. agreeable G. regular H. stimulus I. disruption J. attain K. seek L

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问题     A. while B. dark C. devised D. whereas E. specific
    F. agreeable G. regular H. stimulus I. disruption J. attain
    K. seek L. instructions M. spur N. formal O. available
    Most people who travel long distances complain of jetlag. Jetlag makes business travelers less productive and more prone to making mistakes. It is actually caused by【C1】______ of your "body clock"—a small cluster of brain cells that controls the timing of biological functions. The body clock is designed for a【C2】______ rhythm of daylight and darkness, so that it is thrown out of balance when it encounters daylight and darkness at the wrong times in a new time zone.
    The symptoms of jetlag often persist for days【C3】______ the internal body clock slowly adjusts to the new time zone. Now a new anti-jetlag system is【C4】______that is based on proven extensive pioneering scientific research.
    Dr. Martin Moore-Ede has【C5】______ a practical strategy to adjust the body clock much sooner to the new time zone through controlled exposure to bright light. The time zone shift is easy to accomplish and eliminates most of the discomfort of jetlag. A successful time zone shift depends on knowing the exact time to either【C6】______ or avoid bright light Exposure to light at the wrong time can actually make jetlag worse. The proper schedule for light exposure depends a great deal on 【C7】______ travel plans. Data on a specific flight itinerary and the individual’s sleep pattern are used to produce a Trip Guide with【C8】______ on exactly when to be exposed to bright light. When the Trip Guide calls for bright light you should spend time outdoors if possible. If it is【C9】______ outside, or the weather is bad, or you are on an aeroplane, you can use a special light device to provide the necessary light【C10】______ for a range of activities such as reading, watching TV or working.
【C5】
选项
答案C
解析 空格应填入动词过去分词，与has一起构成句子谓语。根据下文的The time zone shift is easy toaccomplish(转换时区很容易实现)，可推断出这种实用的策略已经“设计出”，因此选C。
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