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
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单项选择题
NOT included in the conviction market is______.
A．worker welfare
B．humane testing
C．"green" products
D．home photography
单项选择题
What may be Roll Jensen's main purpose of classifying these six distinct markets
A．To classify different companies into corresponding market.
B．To invite businesses to consider how to best profit from them.
C．To set some models for companies in the market.
D．To predict trends in the market.
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