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.
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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
The pair of words buy and sell are ______.
A．gradable opposites
B．relational opposites
C．complementary opposites
D．contradictory opposites
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