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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.

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.

单项选择题A．Poor visibility.B．Slippery conditions caused by the rain.C．Both A andB.D．The narrow national highway.

A．Poor visibility.
B．Slippery conditions caused by the rain.
C．Both A andB.
D．The narrow national highway.