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
______ I do my work, the boss doesn't mind what time I arrive at my office.
A．So far as
B．So long as
C．So long
D．So far
单项选择题
The answer must ______ finding new sources of energy.
A．happen to
B．turn out
C．lie in
D．lay in
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