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
During the 19th century, heat was recognized as ______ of motion among tiny molecules.
A．manifestation
B．acceleration
C．abundance
D．deterioration
单项选择题
______ your suggestions deserve considering, the board thinks it unwise to invest so large a sum of money into the project.
A．Assuming
B．While
C．Since
D．As
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