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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、in
B、as
C、at
D、through
答案D
解析 通过原文可知，此处需填入表示“通过”、“凭借”的介词。四个选项中只有 D项through符合要求。
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