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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单项选择题
When the news of his ______ with the enemy became known, he was hanged in effigy.
A．involement
B．conversations
C．collusion
D．complacency
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
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