单项选择题
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A．Clean.
B．Powerful.
C．Cheap.
D．Secure.
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单项选择题
A．Gold was discovered.B．The Transcontinental Railroad was completed.C．The Golden Gate Bridge was constructed.D．Telegraph communications were established with the East.
A．Gold was discovered.
B．The Transcontinental Railroad was completed.
C．The Golden Gate Bridge was constructed.
D．Telegraph communications were established with the East.
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