单项选择题

The description of a language as it changes through time is a______ study.

A．prescriptive
B．descriptive
C．synchronic
D．diachronic
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单项选择题
______refers to the abstract lingusitic system shared by all the members of a speech community.
A．Parole
B．Langue
C．Competence
D．Performance
单项选择题
NOT included in the conviction market is______.
A．worker welfare
B．humane testing
C．"green" products
D．home photography
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