单项选择题

A．contribution
B．deduction
C．contemplation
D．speculation
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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
单项选择题
We may infer that the author is most probably a ______.
A．doctor
B．scientist
C．reporter
D．professor
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