单项选择题

Many old people in the cities find themselves unable to get used to the rapid （）of city life.

A．rate
B．speed
C．step
D．pace

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单项选择题

Millions of Americans flock to their drugstores to buy vitamins and minerals, （）that these pills can help to prevent serious illnesses.

A．convincing
B．convinced
C．to convince
D．to be convinced

单项选择题

If they had sent a check to the telephone company last week, their telephone （）out of service at this moment.

A．will not be
B．will not have been
C．would not be
D．would not have been

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