单项选择题

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.
<上一题 目录 下一题>
热门 试题

单项选择题
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.
单项选择题
The role of the body clock is to
A．enable us to sleep 6 hours a day.
B．help us adapt to a 24-hour cycle.
C．regulate the body's functions.
D．interfere with the body's functions.
相关试题