单项选择题

An action that is lavishly rewarded as soon as it is performed is well on its way to becoming a habit.

A．promptly
B．generously
C．evidently
D．sympathetically
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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
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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