The rise of social media has greatly promoted PR in that A．people can get more information from on-line communication. B．companies need to get firsthand feedback from the consumers. C．PR staff are the best to track and tackle network criticisms. D．businesses need someone to take care of public opinions.
A.people B. B．companies C. C．PR D. D．businesses E.
【参考答案】
D 第四段谈到社交网络对公关的发展影响极大。该段最后一句PRfirmsarecalledonto…是被动语态，结......