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 author of Sister Carrie is ______.
A．Stephen Crane
B．Theodore Dreiser
C．Henry James
D．WilliamD. Howells
单项选择题
In America, high school graduates have to take ______ in order to enter prestigious universities.
A．IELTS
B．GRES
C．TAAS
D．SATS
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