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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单项选择题
It was all agreed that the first problem the new government would have to ______ was unemployment.
A．grip
B．tackle
C．discern
D．manipulate
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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