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 pilot made an unexpected ______ because of engine trouble.
A．conclusion
B．crash
C．victory
D．landing
单项选择题
The world's first national park, Yellowstone National Park , was established in Wyoming in 1872 to protect an area of ______ natural beauty.
A．incredulous
B．incredible
C．edible
D．believable
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