单项选择题

The solution, if that is the case, is to install a pressure-reducing ______ on the water system.

A．shaft
B．shelf
C．axis
D．valve
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The clock in the painting is a symbolic ______ of the passage of time.
A．presentation
B．representation
C．introduction
D．offering
单项选择题
The company had huge debts and was on the ______ of collapse.
A．glare
B．peer
C．blink
D．brink
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