34. According to the passage, what is the key concept of exchange theory? (A) We judge other people on the principle of personal preference. (B) We balance rewards against costs in our interaction with others. (C) We keep our interaction with others rolling on its track by fishing. (D) We make other people happy through exchanging goods with them.

39. According to the passage, which of the following is most likely to be the reason that people in Africa or Pakistan or Chile study English as the obvious foreign language? (A) English is the property of a number of English speaking countries. (B) English has immediate connection with the economic or political supremacy. (C) English provides the quickest access to the bulk of world trade. (D) English is the most beautiful language ever spoken in the history of mankind.

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