单项选择题

The best solution to the problem can only be found by a process of trail and ______.

A．mistake
B．error
C．success
D．experiment
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单项选择题
If excellent work results in frequent pay increases or promotions, the workers will have greater ______ to produce.
A．incentive
B．initiative
C．instruction
D．instinct
单项选择题
When the nurse took his temperature, it was three degrees above ______.
A．average
B．regular
C．normal
D．ordinary
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