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
Language can refer to things that are not present in the immediate situation of the speaker. For example, if someone says I was afraid, it is not necessary that the speaker is still afraid. Which of the following terms describes this property of language
A．Arbitrariness.
B．Motivation;
C．Interchangeability.
D．Displacement.
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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