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．A million dollars.B．25,000 dollars.C．Ten million dollars.D．95,000 dollars.
A．A million dollars.
B．25,000 dollars.
C．Ten million dollars.
D．95,000 dollars.
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.
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