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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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

单项选择题

How many volts of electricity can an electric eel emit

A．1,000.
B．800.
C．200.
D．120.