单项选择题

______ is the most important of all American crops.

A．Wheat
B．Corn
C．Cotton
D．Rice
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单项选择题
Sons and Lovers is an autobiographical novel of ______.
A．D.H. Lawrence
B．Thomas Hardy
C．Henry James
D．Arnold Bennett
单项选择题
The Virgin Islands are located ______.
A．in the Gulf of Mexico
B．in the Pacific Ocean
C．in the North Sea
D．in the Caribbean Sea
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