According to the passage, U. S. leadership in public relations is being threatened because of ________.
A) an unparalleled increase in the number of public relations companies
B) shrinking cultural differences and new communications technologies
C) the decreasing number of multinational corporations in the U. S.
D) increased efforts of other countries in public relations
出自:河南师范大学-小学教育(本科)-大学英语Ⅱ

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