It can be seen from the last two paragraphs that
A. you can control your own body clock.
B. it is not difficult to adjust to a new time zone.
C. adjusting your watch can help you avoid jet lag.
D. there isn't much you can do to avoid jet lag.
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投保人，是指对保险标的具有保险利益，并负有支付（）义务的人。
A. 保险金
B. 保险费
C. 保证金
D. 风险金
The astronomer was not interested in the way dolphins communicate with each other.
A. Right
B. Wrong
C. Not mentioned
Living alone in a house, the writer seems to
A. have totally forgotten her work.
B. be afraid of her neighbors.
C. get some comfort from TV programs.
D. have gone crazy.
Which of the following is NOT mentioned as a reason for the disrupted sleep of travelers
A. Crossing different time zones.
B. Changing light and activity levels.
C. Working longer hours.
D. Watching out of the plane for a long time.
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