Most people who travel long distance complain of jetlag. Jetlag makes business travelers less productive and more prone【21】makin

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问题     Most people who travel long distance complain of jetlag. 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 it 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 anti-jetlag system is【28】 that is based on proven【29】 pioneering scientific  research. Dr, Martin Mooreede had【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 bright light. 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.  

选项 A、experiences
B、possesses
C、encounters
D、retains

答案C

解析 本句意为:“它(生物钟)到了一个新的时区,经历了时间错乱的白天和黑夜,就会失去平衡。”A项experiences侧重于“主观的经历和感受”,主语多为人。B项 possess“拥有”和D项retain“保留,保持”放在上下文中都不通。
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