A few years ago, a university professor tried a little experiment. He sent Chris

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问题 A few years ago, a university professor tried a little experiment. He sent Christmas cards to a sample of perfect strangers. Although he expected some reaction, the response he received was amazing - holiday cards addressed to him came pouring back from the people who had never met nor heard of him. The great majority of those who returned a card never inquired into the identity of the【C1】______professor. They received his holiday greeting card, and they 【C2】______sent one in return. This study shows the action of one of the most powerful of the weapons of influence around us — the rule for reciprocation. The rule says that we should try to repay, in【C3】______, what another person has provided us. If a woman does us a favor, we should do her【C4】______in return; if a man sends us a birthday present, we should remember his birthday with a gift of our own; if a【C5】______invites us to a party, we should be sure to invite them to one of ours. By【C6】______of the reciprocity rule, then, we are obliged to the future repayment of favors, gifts, invitations, and the like. So typical is it for【C7】______to accompany the receipt of such things that a term like "much obliged" has become a synonym for "thank you," not only in the English language but in others as well.
The impressive aspect of the rule for reciprocation and the sense of obligation that 【C8】______with it is its pervasiveness in human culture. It is so【C9】______that after intensive study, sociologists can report that there is no human society that does not【C10】______to the rule.
A. accompanies B. automatically C. couple D. goes
E. indebtedness F. kind G. manner H. mercifully
I. one J. obey K. renowned L. subscribe
M. unknown N. virtue O. widespread [br] 【C1】

选项

答案 M

解析 unknown，上下文题。根据空格后的名词professor，可知空格中应填入形容词。同时依据上文“The great majority of those who returned a card never inquired into the identity”，可知这些回信的人并不问询这位教授的身份，这意味着这位教授对他们而言是“未知人士”，故选用unknown“未知的”。

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