单项选择题


A．therefore
B．which
C．however
D．where
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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.
单项选择题
Sleep defensively means that ______.
A．people should go to a doctor and have their problems diagnosed
B．people should exercise immediately before going to bed every night
C．people should sacrifice other things to get enough sleep if necessary
D．people should give up going to bed and getting up at the same time every day
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