The electric eel（电鳗） is

　　an amazing living storage battery. It can send a jolt of as much as eight hundred volts of electricity through the water in which it lives. （An electric house current is only one hundred twenty volts.） As many as four- fifths of all the cells in the electric eel’s body are specialized for generating electricity， and the strength of the shock it can deliver equals the length of its body.

　　61.What is the main idea of this 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.

　　62.The author mentions all of the following as results of a power failure EXCEPT ______.

　　A. refrigerated food items may go bad

　　B. traffic lights do not work

　　C. people must rely on candlelight

　　D. elevators do not function

　　63.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.

　　64.How many volts of electricity can an electric eel send out?

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