There are three characteristics of the communication revolution that have profound implications for health communication, education, and promotion, in transforming how we access and act on health information. They are: 1）Proliferation of Platforms；2）（）；and 3）Greater Grassroots Participation.

A.More information sharing

B.Less grassroots involvement

C.More cencorship of information

D.Less Gate-keeping

正确答案：Less Gate-keeping