【单选题】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.
【单选题】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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