单项选择题

Since ancient times people have found various ways to preserve meat.

A．eat
B．cook
C．freeze
D．keep
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It is the movement, not the color, of objects that excites the bull.
A．frightens
B．scares
C．arouses
D．confuses
单项选择题
The boy is intelligent.
A．clever
B．naughty
C．difficult
D．active
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