单项选择题

With temperature （） so rapidly, we could not go on with the experiment.

A．fell
B．fall
C．falling
D．fallen

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单项选择题

During the past years the （） of automobile accidents in New York City has decreased.

A．degree
B．quantity
C．number
D．amount

单项选择题

As college teachers, they enjoy talking about their own （）.

A．problems
B．experiences
C．interests
D．fields

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