问答题

People who cant get to sleep are advised to sleep at______.
A．any time in a day as long as one wishes
B．the time when one plans to sleep
C．a very early time at night
D．a very late time at night

A.
A．any
B.the
C.a
D.a

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The reasons why most people have trouble sleeping are all of the following EXCEPT that they ______.
A．are too busy working
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C．have some health problems
D．don't think sleep can influence health

A.
A．are
B.aren't
C.have
D.don't

The dental hygiene includes all of the following EXCEPT______.
A．brushing your teeth twice a day
B．flossing your teeth once a day
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A.
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C.avoiding
D.seeing