单项选择题

One characteristic of the rich classes of a declining society is their tendency to ________.

A．take in the recently wealthy
B．retreat within themselves
C．produce publications on manners
D．change the laws of etiquette
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单项选择题
In the author's opinion, the debate at Harvard ________.
A．is a symbol of the general bewilderment.
B．will soon be over.
C．will influence the future life in America.
D．is interesting to Harvard men and their friends.
单项选择题
In some speech community, two languages are used side by side with each having a different role to play, this is __________.
A．pidgin
B．creole
C．diglossia
D．bilingualism
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