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

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

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