单项选择题

In previous times, when fresh meat was in short______, pigeons were kept by many households as a source of food.

A．store
B．provision
C．reserve
D．supply
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单项选择题
They are going to have the serviceman ______ an electric fan in the office tomorrow.
A．install
B．to install
C．to be installed
D．installed
单项选择题
If this kind of fish becomes ______, future generations may never taste it at all.
A．minimum
B．short
C．seldom
D．scarce
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