单项选择题

Our journey was slow because the train stopped _________ at different villages.

A．gradually
B．unceasingly
C．continually
D．continuously
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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
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
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