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
How many volts of electricity can an electric eel emit
A．1,000.
B．800.
C．200.
D．120.
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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