单项选择题

A．The gravitational force.
B．The electromagnetic force.
C．The weak force.
D．The strong force.
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单项选择题
A．New York.B．Detroit.C．Los Angeles.D．San Francisco.
A．New York.
B．Detroit.
C．Los Angeles.
D．San Francisco.
单项选择题
A．Because man has a strong desire for a modem way of life.B．Because pollution is caused by man.C．Because people from the countryside rush into the cities.D．Because people are not aware of the benefits of modern society.
A．Because man has a strong desire for a modem way of life.
B．Because pollution is caused by man.
C．Because people from the countryside rush into the cities.
D．Because people are not aware of the benefits of modern society.
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