单项选择题

According to the passage, ______ has become the driving force for the development of telephone system

A．information technologies
B．Internet
C．PC
D．convergence of telecommunications technologies
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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
单项选择题
Canada comprises ______ provinces and three territories.
A．15
B．8
C．10
D．28
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