[单项选择]Most people who travel in the course of their work are given traveling _______.
A. income
B. fee
C. pay
D. allowance

Most people who travel long distances complain of jetlag (喷气飞行时差反应). 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 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 antijetlag system is (28) that is based on proven (29) pioneering scientific research. Dr. martin Moore-Ede has (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 discomfo
A. off
B. instructions
C. for
D. commentaries