单项选择题

This procedure does not allow for adaptability, essential for applications such as process control, which must change as conditions______________.

A．fluctuate
B．stagger
C．swing
D．vibrate
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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
单项选择题
We had to sit through several________ lectures and in fact we did not learn anything from them.
A．hostile
B．anxious
C．conscientious
D．tedious
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