单项选择题

Stress can be either helpful or harmful depending on ______.

A．how a person deals with stress
B．what kind of stress it is
C．whether the stress can lead to emotional, intellectual, or physical disorder
D．how much exercise you do

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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

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