[单项选择]

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
A. in
B. as
C. at
D. through

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