单项选择题

In times of war, we must take precautions against acts of ______ as well as of direct violence.

A．viciousness
B．sabotage
C．pretext
D．hatefulness
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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
Such an ______ act of hostility can only lead to war.
A．overt
B．opportunistic
C．occadional
D．unequaled
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