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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The ______ of these good to the others is easy to see.
A．prestige
B．superiority
C．priority
D．publicity
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All the parts of these washing machines are ______, so that it is very convenient tO replace them.
A．normalized
B．modernized
C．mechanized
D．standardized
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