2. 外语
  3. A. accompanies B. automatically C. couple D. goes E. indebtedness F. kind G. manner

A. accompanies B. automatically C. couple D. goes E. indebtedness F. kind G. manner

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问题     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
    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.
【C1】
选项
答案M
解析 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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