单项选择题

To prevent the spread of the epidemic, the public health organization carries out frequent ______ on the restaurants.

A．inspection
B．investigation
C．observation
D．examination
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单项选择题
He is planning another tour abroad, yet his passport will ______ at the end of this month.
A．expire
B．exceed
C．terminate
D．cease
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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