单项选择题

What we consider a luxury at one time frequently becomes a ______, many families find that ownership of two cars is indispensable.

A．fad
B．necessity
C．trend
D．nuisance
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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
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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