单项选择题

The European Union countries were once worried that they would not have ______ supplies of petroleum.

A．proficient
B．efficient
C．potential
D．sufficient
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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
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
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