单项选择题

The pilot made an unexpected ______ because of engine trouble.

A．conclusion
B．crash
C．victory
D．landing
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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
单项选择题
Edison's retook that genius is one percent inspiration and ninety-nine percent perspiration demonstrates that the ______ worker is valuable.
A．inspired
B．assiduous
C．perspired
D．eager
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