单项选择题

Companies are struggling to find the right ______ between supply and demand, but it is no easy task.

A．equation
B．formula
C．balance
D．pattern
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单项选择题
The most basic reason why dialects should be preserved is that language helps to ______ a culture.
A．retain
B．relate
C．remark
D．review
单项选择题
Computer power now allows automatic searches of fingerprint files to match a print at a crime ______.
A．stage
B．scene
C．location
D．occasion
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