Most people who travel long distance complain of jetlag. Jetlag makes business travelers less productive and more prone【C1】_____

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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 disruption of your "body clock"—a small cluster of brain cells that controls the timing of biological【C2】______ . The body clock is designed for a regular rhythm of daylight and darkness, so that it is thrown out of balance when it【C3】______ daylight and darkness at the "wrong" times in a new time zone. The【C4】______ of jetlag of ten persist for days while the internal body clock slowly adjusts to the new time zone.
    Now a new anti-jetlag system is【C5】______ that is based on proven【C6】______ pioneering scientific research. Dr. Martin Mooreede had devised a practical strategy to adjust the body clock much sooner to the new time zone【C7】______ controlled exposure to bright light. The time zone shift is easy to accomplish and eliminates【C8】______ of the discomfort of jetlag.
    A successful time zone shift depends on knowing the exact times to either【C9】______ 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【C10】______ travel plans.
【C4】

选项 A、signs
B、defects
C、diseases
D、symptoms

答案D

解析 本句可译为:“因跨越时区而导致的不适症状通常会持续数天。”D项symptoms“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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