单项选择题

Psychologists have been studying _________in rats in an attempt to discover more about human mental processes connected with sight.

A．performance
B．perception
C．personality
D．perspective
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单项选择题
The engine has more than three hundred_________, made of a lot of different materials.
A．compositions
B．components
C．compounds
D．combinations
单项选择题
The few remaining pockets of resistance were finally _________into submission by the cruel methods of the conquering army.
A．clashed
B．smashed
C．crashed
D．crushed
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