单项选择题

A．A driving test.
B．A police movie.
C．A traffic accident.
D．The way to make signals.
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单项选择题
What cause our lack of confidence in this purchase are the ______ of the machine: large consumption of energy, need of frequent maintenance and high price.
A．merits
B．handicaps
C．bruises
D．drawbacks
单项选择题
The company formulated a package of ______ for assessment of employees' performance.
A．criteria
B．partitions
C．principles
D．thresholds
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