In which format is the presenter only heard, but never seen or identified?

The general theory of refutation is to

a. aim it at the lowest conceptual level possible. b. aim it at the highest conceptual level possible. c. advance every possible argument. d. never advance more than two arguments.

Research suggests that two days after we hear a speech we will have forgotten 75 percent of what was

said. Indicate whether the statement is true or false