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
Why does the author mention electric eels
A．To warn the reader to stay away from them.
B．To compare their voltage to that used in houses.
C．To give an example of a living electrical generator.
D．To describe a new source of electrical power.
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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