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

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

admin2012-10-23  50
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、formal
B、continual
C、regular
D、circular
答案C
解析 本句意为：“体内的生物钟是根据日夜规律的交替而设计的。”C项rhythm可用来形容日夜交替的节律，C项为正确答案。A项formal意为“形式的；正式的”，B项 continual意为“持续的，不断的”；D项circular意为“圆形的，循环的”。
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