单项选择题

You feel tired all day probably because ______.

A．you stay up too late
B．you get up too early in the morning
C．you take sleeping pills
D．you wake up too frequently at night
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单项选择题
Which of the following is true according to the passage
A．You mustn't take sleeping pills in order to get a good night' s sleep.
B．You should stay up if you want to sleep effectively.
C．Food is necessary at night if you fail to go to sleep.
D．It is very important to get out of the habit of taking a nap after dinner.
单项选择题
Which of the following is NOT true if you want to get out of the habit of sleeping during the evening
A．Go to bed earlier than usual.
B．Talk with friends after dinner.
C．Stay with friends after dinner.
D．Do some mental work.
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