单项选择题

The law of supply and demand will eventually take care of a shortage or ______ of dentists.

A．surge
B．surplus
C．flush
D．fluctuation
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单项选择题
Some felt that they were hurrying into an epoch of unprecedented enlightenment in which better education and beneficial technology would ______ wealth and leisure for all.
A．maintain
B．ensure
C．certify
D．console
单项选择题
Fiber-optic cables can carry hundreds of telephone conversations ______.
A．homogeneously
B．spontaneously
C．simultaneously
D．ingeniously
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