单项选择题

There are certain _________when you must interrupt people who are in the middle of doing something.

A．occasions
B．conditions
C．environments
D．situations
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单项选择题
Our journey was slow because the train stopped _________ at different villages.
A．gradually
B．unceasingly
C．continually
D．continuously
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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