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.

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单项选择题

It is suggested that if you are unhappy at first with your life as a college student, you should ______.

A．complain to the school authorities
B．allow yourself some time to adapt to the change at college
C．seek help from your parents
D．learn to live independently

单项选择题

Exercise habits can help relieve stress in that ______.

A．exercising gives people opportunities to meet friends
B．exercises prevent people from eating too much
C．exercising gives people a break from physical, mental and emotional tension
D．people can learn new skills while doing exercises