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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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
单项选择题
During the 19th century, heat was recognized as ______ of motion among tiny molecules.
A．manifestation
B．acceleration
C．abundance
D．deterioration
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