单选题
According to the passage, U.S. leadership in public relations is being threatened because of ______.
A、
shrinking cultural differences and new communication technologies
B、
increased efforts of other countries in public relations
C、
an unparalleled increase in the number of public relations companies
D、
the decreasing number of multinational corporations technologies
【正确答案】
B
【答案解析】
本题询问的是美国在公共关系业中的领袖地位受到威胁的原因是什么。从文章的第一段可以判断A、D、C所涉及的三点是公共关系业迅速发展和增长的原因，与题意不符。而根据第二段的内容可以肯定B为正确答案。
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