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
All flights ______because of the snowstorm, many passengers could do nothing but take the train.
A．had been canceled
B．have been canceled
C．were canceled
D．having been canceled
单项选择题
The first Olympiad is said to have consisted ______of a 200-yard foot race near the small city of Olympia.
A．nearly
B．completely
C．merely
D．identically
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