单项选择题

As China is such a populous country, the present concern for most people is still ______.

A. starches
B. substance C; sustenance
D. substitute
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单项选择题
When he tried to make a ______ , he found that the hotel was completely filled because of a convention.
A．reservation
B．claim
C．mess
D．revision
单项选择题
A body, ______ it is in motion, would never stop itself if there were no friction.
A．where
B．by time
C．once
D．at the moment
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