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
Rip Von Winkle is a story adapted by ______ from German legend.
A．JamesF. Cooper
B．Washington Irving
C．Nathaniel Hawthorne
D．Edgar Ellan Poe
单项选择题
Which of the following is not a design feature of language
A．Duality.
B．Displacement.
C．Translatability.
D．Productivity.
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