Most people who travel long distances complain of jetlag (喷气飞行时差反应). Jetlag makes business travelers less productive and more pr

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问题    Most people who travel long distances complain of jetlag (喷气飞行时差反应). Jetlag makes business travelers less productive and more prone  【21】______  making mistakes. It is actually caused by  【22】______  of your “body clock” a small cluster of brain cells that controls the timing of biological  【23】______  The body clock is designed for a  【24】______  rhythm of daylight and darkness, so that is thrown out of balance when it  【25】______  daylight and darkness at the “wrong times in a new time zone. The  【26】______  of jetlag often persist for days  【27】______  the internal body clock slowly adjusts to the new time zone. Now a new antijetlag system is  【28】______  that is based on proven  【29】______  pioneering scientific research. Dr. martin Moore-Ede has  【30】______  a practical strategy to adjust the body clock much sooner to the new time zone  【31】______  controlled exposure to bright light. The time zone shift is easy to accomplish and eliminates  【32】______  of the discomfort of jetlag.
   A successful time zone shift depends on knowing the exact times to either  【33】______  or avoid brightlight. Exposure to light at the wrong time can actually make jetlag worse. The proper schedule  【34】______  light exposure depends a great deal on  【35】______  travel plans.
   Data on a specific flight itinerary(施行路线) and the individual’s sleep  【36】______  are used to produce a Trip Guide with  【37】______  on exactly when to be exposed to bright light.
   When the Trip Guide calls  【38】______  bright light you should spend time outdoors if possible. If it is dark outside, or the weather is bad,  【39】______  you are on an aeroplane, you can use a special light device to provide the necessary light  【40】______  for a range of activities such as reading, watching TV or working.
【26】

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

答案B

解析 本题要求考生选择恰当的名词作句子的主语。空格所在句子的前半句意思是:“时差反应的——常常顽固地持续好几天”。时差反应是生理上失去平衡,因此会产生某种症状。在4个选项中,symptom的意思是“病症,症状”(something wrong with one’s body or mind that is a sign of the illness),放人句中意思通顺,因此B.symptoms是答案。D项defect的意思是“缺点,欠缺”。时差反应不是一种缺点,因此D项不是答案。C项sign的意思是“征兆,迹象
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