单项选择题

A．The new technology used to build roads.
B．The ability to transport goods over land.
C．The trade in grain and cotton.
D．The linking of smaller local roads into one long road.
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单项选择题
A．Violence on television.B．Transportation in the city.C．The history of transportation.D．Bureaucracy in the city.
A．Violence on television.
B．Transportation in the city.
C．The history of transportation.
D．Bureaucracy in the city.
单项选择题
A．The advantages of an economy based on farming.B．Reasons farmers continued using river transportation.C．The role of cotton in the United States economy.D．Improved methods of transporting farm crops.
A．The advantages of an economy based on farming.
B．Reasons farmers continued using river transportation.
C．The role of cotton in the United States economy.
D．Improved methods of transporting farm crops.
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