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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