【段2】①The supposed importance of influentials derives from a plausible-sounding but largely untested theory called the “two-step flow of communication”: Information flows from the media to the influentials and from them to everyone else.
22.The author suggests that the “two-step-flow theory”
[A]serves as a solution to marketing problems.
[B]has helped explain certain prevalent trends.
[C]has won support from influentials.
[D]requires solid evidence for its validity.
答案：D
问：21题D选项中的requires solid evidence对应原文中的什么内容？
A : plausible-sounding but largely untested
B : flows from the media to the influentials
C : The supposed importance of influentials
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