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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] 【C6】
选项 A、signs
B、defects
C、diseases
D、symptoms
答案 D
解析 本句意为：“因跨越时区而导致的不适症状通常会持续数天”。D项symptoms意为“症状”，最符合原文。首先，这种不适并不属于疾病的范畴，因此C项可以排除。A项signs意为“标志；迹象，征兆”。例如：There are no signs of life about the house．这所房子没有住人的迹象。B项defects通常指事物“固有的、先天的缺陷”。
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