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.

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热门试题

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.

单项选择题

The phrase coming back out of the cave in the fifth paragraph means

A．"coming back home".
B．"giving up the present job".
C．"living a luxurious life".
D．"restoring real human contact".