单项选择题

It is laid out that candidates must have normal hearing and colour______.

A．outlook
B．vision
C．horizon
D．perspective
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单项选择题
Two years later, at the mid-term elections, his party suffered a very serious______.
A．disturbance
B．setback
C．output
D．distortion
单项选择题
Economists say that merely raising the minimum wage would have a(n)______ effect on employment rates.
A．negligible
B．invisible
C．ignorant
D．appreciable
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