单项选择题

It can be inferred from the passage that the longer an eel is the ______.

A．more beneficial it will be to science
B．more powerful will be its electrical charge
C．easier it will be to find
D．tougher it will be to eat
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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.
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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