单项选择题

You should ______ the wheels of your bicycle once a month.

A．fabricate
B．lubricate
C．elaborate
D．illustrate
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单项选择题
______ always exists between the theoretical deduction and the result of experimentation.
A．Deviation
B．Derivation
C．Variation
D．Variety
单项选择题
The symphony concerts here are ______ by the municipal government.
A．subdued
B．subscribed
C．subordinated
D．subsidized
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