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
It is important that the hotel receptionist______ that guests are registered correctly.
A．has made sure
B．made sure
C．must make sure
D．make sure
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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