单项选择题

A．work together with policemen on the graveyard.
B．do the same thing as policemen.
C．can have days off but policemen cannot.
D．don’t have to work double-backs.
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单项选择题
If a lingustic study aims to lay down rules for correct and standard behaviour in using language, it is said to be______.
A．prescriptive
B．descriptive
C．synchronic
D．diachronic
单项选择题
N. Chomsky defines as the ideal user's knowledge of the rules of his language.
A．parole
B．langue
C．competence
D．performance
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