Vocal variety refers to vocal change and movement in:

Dr. Murphy left his podium and closed the door because some students were talking loudly in the hallway. What type of barrier to listening was Dr. Murphy managing?

A) multi-tasking B) mental C) lack of focus D) physical

Cynthia needs a presentation aid for her speech on

molecular biology and she has decided to go to the craft store and purchase supplies to create a three-dimensional representation of a molecule. Cynthia's presentation aid is an example of a a. photograph. b. model. c. graph. d. chart.