单项选择题

In communication one may shift from formal English to informal English or from standard English to non-standard English. This is known as ______.

A．code-switching
B．language planning
C．politeness strategies
D．bilingualism
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单项选择题
The study of how we do things with words is the study of ______.
A．entailment
B．presupposition
C．speech acts
D．metaphor
单项选择题
Which of the following is NOT among the reasons that India is creating a secondary sanctuary for the Asiatic lions
A．Too many of them in the present sanctuary.
B．Possible outbreak of disease.
C．Clashing with people.
D．Food shortag
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