单项选择题

According to the writer, it is difficult for you to go to sleep if ______.

A．you get the habit of staying up late
B．you haven't taken sleeping pills
C．you sleep for hours after dinner
D．you fail to do some exercises
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单项选择题
We may infer that the author is most probably a ______.
A．doctor
B．scientist
C．reporter
D．professor
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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