单项选择题

The author mentions all of the following as results of a blackout EXCEPT ______.

A．refrigerated food items may go bad
B．traffic lights do not work
C．people must rely on candlelight
D．elevators and escalators do not function
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单项选择题
Why does the author mention electric eels
A．To warn the reader to stay away from them.
B．To compare their voltage to that used in houses.
C．To give an example of a living electrical generator.
D．To describe a new source of electrical power.
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