单项选择题

One of the most common techniques is to add alloying elements that inhibit the corrosion.

A．restrain
B．retain
C．relieve
D．repulse
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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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