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  3. Most people who travel long distance complain of jetlag. Jetlag makes busine

Most people who travel long distance complain of jetlag. Jetlag makes busine

游客2025-04-05  4
问题     Most people who travel long distance 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 research. Dr. Martin Mooreede had【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. [br] 【C7】
选项 A、if
B、whereas
C、while
D、although
答案 C
解析 从本句可以看出，其中的两个分句的动作是同时进行的。因此应选C项while“当……的时候”。
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