单项选择题

In his ______ to further knowledge of the universe, man has now begun to explore space.

A．attempt
B．expedition
C．trial
D．chase
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单项选择题
The senator agrees that his support of the action would ______ his chances for reelection.
A．obscure
B．mystify
C．distinguish
D．jeopardize
单项选择题
The manufacturers hoped that the motor show would ______ their car sales.
A．promise
B．lift
C．intensify
D．boost
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