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
General George Washington and his hungry, ragged troops crossed the Delaware River from Pennsylvania, surprised the garrison of German mercenaries in Trenton, and captured the city.
A．provocative
B．foppish
C．formidable
D．shabby
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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