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
Canada comprises ______ provinces and three territories.
A． 15
B． 8 C. 10
C． 28
单项选择题
Why are the lions in the Gir Forest especially vulnerable to disease
A．They are physically weaker than the African lions.
B．They are small in size.
C．They do not have enough to eat.
D．They have descended from a dozen or so ancestors.
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