单项选择题

Since most doctors are ______ about effectiveness of the new medicine, they seldom recommend it to their patients.

A．anxious
B．dubious
C．cynical
D．innocent
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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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