单项选择题

Radio is one of ______ means of sending news and information.

A．the most common
B．the commonest
C．more common
D．common
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单项选择题
______ is often more difficult to find trained men than to get financial support for scientific research.
A．It
B．That
C．This
D．What
单项选择题
The doctor advised that he ______ smoking immediately.
A．stops
B．stopped
C．stop
D．will stop
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