单项选择题

A．50 years.
B．100 years.
C．200 years.
D．300 years.
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单项选择题
A．A librarian.B．A Chairman.C．A monitor.D．A lecturer.
A．A librarian.
B．A Chairman.
C．A monitor.
D．A lecturer.
单项选择题
A．The oceans and the gold rush.B．Tourism and the entertainment industry.C．The railroads and the discovery of oil.D．Sea trade and the airplane industry.
A．The oceans and the gold rush.
B．Tourism and the entertainment industry.
C．The railroads and the discovery of oil.
D．Sea trade and the airplane industry.
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