单项选择题

A scientific study of language is conducted with reference to some ______ of language structure.

A．data
B．general theory
C．facts
D．hypotheses
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单项选择题
The distinction between competence and performance is similar to the distinction between ______.
A．prescriptive and descriptive
B．synchronic and diachronic
C．speech and writing
D．langue and parole
单项选择题
Design features refer to the defining properties of human language that distinguish it from any ______ system of communication.
A．artificial
B．non-linguistic
C．animal
D．abstract
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