单项选择题

Which of the following measures can help you sleep better

A．Staying up late.
B．Taking a hot bath.
C．Having late meals.
D．Traveling between time zones.
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单项选择题
According to the author, many sleeping disorders are caused by ______.
A．bad eating habits
B．pre-bedtime exercises
C．improper sleep patterns
D．chronic fatigue syndrome
单项选择题
For our bodies to function properly, we should ______.
A．sleep for at least eight hours per night
B．believe that we need less sleep as we age
C．adjust our activities to new environment
D．be able to predict the rhythms of our biological clocks
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