单项选择题

The production of synthetics intensified the drain on energy resources, already sorely pressed by the increase in ______ demand.

A．authoritative
B．aggressive
C．ample
D．aggregate
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单项选择题
South Africa' s economy displayed some ______ signs of growth, but worldwide sanctions were slowing any widespread recovery.
A．modest
B．generous
C．medieval
D．genetic
单项选择题
It is well known that knowledge is the ______ condition for expansion of mind.
A．incompatible
B．incredible
C．indefinite
D．indispensable
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