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
Such an ______ act of hostility can only lead to war.
A．overt
B．opportunistic
C．occadional
D．unequaled
单项选择题
The book, published ______, revived our interest in the author who had just died.
A．anonymously
B．privately
C．recently
D．posthumously
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