Page and Brin originally opposed advertising as "a commercial contaminant" of their creation but finally gave in and began accepting advertising in 2010

Previews are a necessary part of speech introductions because they do all of the following except:

a. give the audience an opportunity to determine how interested they are in your topic b. communicate to your audience that you are organized and competent. c. prepare your audience for listening to your speech. d. help your audience organize their thoughts about what they're going to hear.

Groups of people who live within a dominant culture yet are members of another group or groups that are not dominant in a particular society are known as which of the following?

A) diffused groups B) socially aware C) invented groups D) social communities E) marginal communities