单项选择题

It is a good idea for parents to monitor the ______as well as the kind of television that their children watch.

A．number
B．size
C．amount
D．screen
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单项选择题
E-mail writing has became the usual means of communication ______ people some distance away.
A．for
B．on
C．to
D．with
单项选择题
As Christmas was coming, the town began a ______ clearing on a large scale.
A．through
B．thorough
C．though
D．thought
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