2. 外语
  3. Most people who travel long distances complain of jetlag. Jetlag makes business travelers less productive and more prone(1)_____

Most people who travel long distances complain of jetlag. Jetlag makes business travelers less productive and more prone(1)_____

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问题     Most people who travel long distances complain of jetlag. Jetlag makes business travelers less productive and more prone(1)_____ making mistakes. It is actually caused by(2)_____ of your "body clock"—a small cluster of brain cells that controls the timing of biological(3)_____. The body clock is designed for a(4)_____ rhythm of daylight and darkness, so that it is thrown out of balance when it(5)_____ daylight and darkness at the wrong times in a new time zone.
    The(6)_____ of jetlag often persist for days (7)_____ the internal body clock slowly adjusts to the new time zone. Now a new anti-jetlag system is (8)_____ that is based on proven(9)_____ pioneering scientific research.
    Dr. Martin Moore-Ede has(10)_____ a practical strategy to adjust the body clock much sooner to the new time zone(11)_____ controlled exposure to bright light. The time zone shift is easy to accomplish and eliminates(12)_____ of the discomfort of jetlag. A successful time zone shift depends on knowing the exact time to either(13)_____ or avoid bright light. Exposure to light at the wrong time can actually make jetlag worse. The proper schedule(14)_____ light exposure depends a great deal on(15)_____ travel plans. Data on a specific flight itinerary and the individual’s sleep(16)_____ are used to produce a Trip Guide with(17)_____ on exactly when to be exposed to bright light. When the Trip Guide calls(18)_____ bright light you should spend time outdoors if possible. If it is dark outside, or the weather is bad,(19)_____ you are on an aeroplane, you can use a special light device to provide the necessary light(20)_____ for a range of activities such as reading, watching TV or working.
(19)
选项 A、or
B、and
C、but
D、while
答案A
解析 上文If条件句假设的是三种并列的情形，根据第二个分句的or，可判断空格处也应填入or．故选A。
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