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
In an allergic reaction, the immune system mistakenly ______ a harmless substance as a harmful one.
A．translates
B．dubs
C．interprets
D．produces
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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