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
The paradoxes in the passage mean ______.
A．unusual situations
B．difficult puzzles
C．abnormal conditions
D．self-contradictions
单项选择题
It can be inferred from the passage that in life' s goal people of Harvard are becoming ______.
A．less sure about it
B．more sure about it
C．less interested in it
D．more hopeful of it
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