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.
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单项选择题
A．A working boy.B．An advertiser.C．A middle school student.D．A college student.
A．A working boy.
B．An advertiser.
C．A middle school student.
D．A college student.
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