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．Willia
单项选择题
What impressed the author most when he went to watch the lions in the Gir Forest
A．The lions were on the brink of extinction.
B．They were suffering from a fatal disease.
C．They allowed him to see their vitality and charm at close quarters.
D．Mother lion and her cub shared a deer.
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