Which of the following types of speeches is appropriate when the speaker wants to change the audience's attitudes towards a topic?

When we use argumentation to test a hypothesis, presumption is

(a) artificial. (b) natural. (c) not employed. (d) assigned to the advocate.

Carl often changes the subject when his girlfriend asks him how he's feeling about their relationship, which demonstrates:

  a.  equivocation.   b.  exaggeration.   c.  omission.   d.  falsification.