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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  66
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、extensive
B、tentative
C、broad
D、inclusive
答案B
解析 C项broad意为“宽阔的，概括的”；D项inclusive意为“包括的”，用来修饰pioneering scientific research显然都不合适，所以可以排除C项和D项。A项extensive意为“广泛的，大量的”，显然和文中所给出的pioneering“前卫的，创新的”不符合。因此只有B项tentative“试探的，实验性的”和上下文最贴切。
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