单项选择题

When the colonel learned that headquarters had been unable to send him reinforcements, he ______ the order for the scheduled attack.

A．countermanded
B．relinquished
C．rephrased
D．invalidated
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单项选择题
The great ______ that have influenced the world's thinkers came not from committees but from individuals who groped for the truth in independent research.
A．obeservations
B．generalization
C．manifestation
D．catastrophes
单项选择题
I can think of nothing more ______ than arriving at the theater and discovering that I have left the tickets at home.
A．vicious
B．inviting
C．vexatious
D．immoral
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