Violence and protests are two of the few avenues of influence available to groups with few economic resources and little political clout to bring about change in problematic actions of large organizations

Which of these play(s) a role in the way we hear sound?

A. duration B. velocity C. distance D. all of these E. none of these

The text says that for a long presentation that lasts all afternoon, it is best to give a coffee or stretch break after every ________-minute period.

A. 45 B. 90 C. 30 D. 60