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
What is the main idea of the passage
A．Electric eels are potentially dangerous.
B．Biology and electricity appear to be closely related.
C．People would be at a loss without electricity.
D．Scientists still have much to discover about electricity.
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