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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.
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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