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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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
单项选择题
There has been a collision ______ a number of cars on the main road to town.
A. composing
B. consisting
C. involving
D. engaging
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