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  3. Most people who travel long distance complain of jetlag. Jetlag makes business travelers less productive and more prone 【B1】____

Most people who travel long distance complain of jetlag. Jetlag makes business travelers less productive and more prone 【B1】____

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问题     Most people who travel long distance complain of jetlag. Jetlag makes business travelers less productive and more prone 【B1】______ making mistakes. It is actually caused by 【B2】______ of your"body clock"—a small cluster of brain cells that controls the timing of biological【B3】______. The body clock is designed for a【B4】______rhythm of daylight and darkness, so that it is thrown out of balance when it 【B5】______ daylight and darkness at the "wrong" times in a new time zone. The【B6】______of jetlag often persist for days【B7】______the internal body clock slowly adjusts to the new time zone.
    Now a new anti-jetlag system is【B8】______that is based on proven【B9】______pioneering scientific research. Dr. Martin Moore Ede had【B10】______a practical strategy to adjust the body clock much sooner to the new time zone【B11】______controlled exposure to bright light. The time zone shift is easy to accomplish and eliminates【B12】______of the discomfort of jetlag.
    A successful time zone shift depends on knowing the exact times to either【B13】______or avoid bright light. Exposure to light at the wrong time can actually make jetlag worse. The proper schedule【B14】______light exposure depends a great deal on【B15】______travel plans.
    Data on a specific flight itinerary and the individual’ s sleep【B16】______are used to produce a Trip Guide with【B17】______on exactly when to be exposed to bright light.
    When the Trip Guide calls【B18】______bright light you should spend time outdoors if possible. If it is dark outside, or the weather is bad,【B19】______you are on an aeroplane, you can use a special light device to provide the necessary light【B20】______for a range of activities such as reading, watching TV or working.
【B4】
选项 A、formal
B、continual
C、regular
D、circular
答案C
解析 考查上下文语义及形容词辨析。原句意为：体内的生物钟是根据日夜规律的交替而设计的。用来形容日夜交替的rhythm“节律”的自然是C．regular最合适，故为正确答案。formal“形式的；正式的”；continual“持续的，不断的”；circular“圆形的，循环的”，均不符合题意。
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