单项选择题

If the pressure is not _______ at once, there may be an explosion.

A．relieved
B．retreated
C．released
D．revealed
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单项选择题
The town planning commission said that their financial outlook for the next year was optimistic.They expect increased tax _______.
A．efficiency
B．revenues
C．privileges
D．profits
单项选择题
A good diet helps the body to build up a(an)_______ to disease.
A．defiance
B．resistance
C．opposition
D．objection
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