单项选择题

Travelers in space have to ______ many discomforts in their spaceships.

A．maintain
B．persist
C．endure
D．sustain
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单项选择题
Congress was hit with a ______ mail campaign, and nearly 150 bills were introduced which would amend the Constitution to permit Bible reading and prayer in public places.
A．immune
B．gigantic
C．luminous
D．petty
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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