单项选择题

A．New York.
B．Detroit.
C．Los Angeles.
D．San Francisco.
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单项选择题
A．The gravitational force.B．The electromagnetic force.C．The weak force.D．The strong force.
A．The gravitational force.
B．The electromagnetic force.
C．The weak force.
D．The strong force.
填空题
S3
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