单项选择题

The ________ feature is considered central to human language, which means two levels of “structure” or “patterning”.

A．duality
B．arbitrariness
C．displacement
D．creativity

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单项选择题

Which of the following abbreviations is NOT so associated with the U.S. as the other three

A．MIT
B．NBA
C．VOA
D．CBA

单项选择题

Edgar Allan Poe was most famous for his poems and _____ stories.

A．short comic
B．long tragic
C．long detective
D．short grotesque

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