单项选择题

Officials, whatever their rank, are supposed to ______ themselves to the welfare and health of the general public.

A．accustom
B．commit
C．accommodate
D．adapt
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单项选择题
The president's fitful rule is seen to be even more de signed to serve the interests of people ______.
A．at a loss
B．at a stroke
C．at large
D．at hand
单项选择题
We must ______ our strength and swim vigorously up stream.
A．sum up
B．summon up
C．catch on
D．watch out
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