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
There is a ______ difference in meaning between the words surroundings and environment .
A．gentle
B．subtle
C．feeble
D．humble
单项选择题
To keep with the new developments in this field he ______ to a number of journals concerned with it.
A．subscribed
B．prescribed
C．subsidized
D．substituted
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