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
Which of the following is NOT an English noble title
A．Duke
B．Baron
C．Earl
D．Count
单项选择题
______ is not one of William Shakespeare's four greatest tragedies.
A．Hamlet
B．Macbeth
C．The Twelveth Night
D．Othello
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