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
The pair of words buy and sell are ______.
A．gradable opposites
B．relational opposites
C．complementary opposites
D．contradictory opposites
单项选择题
The largest lake in Britain is ______.
A．The Lough Neagh
B．Windermere Water
C．Coniston Water
D．the Lake District
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