A person can be more lonely among men than by himself at home because______. The author says that etiquette and politeness are_

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问题 A person can be more lonely among men than by himself at home because______.
The author says that etiquette and politeness are______.

选项 A、rules agreed on to facilitate frequent meetings
B、rules that make frequent meetings tolerable
C、necessary rules for the conduct of any society
D、false standards of value fostered by society