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 roa
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单项选择题
A．Get the results of the survey back.B．Draw the results of the survey.C．Make some conclusions.D．Collect more information
A．Get the results of the survey back.
B．Draw the results of the survey.
C．Make some conclusions.
D．Collect more information
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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