After orgasm, men experience a short refractory period during which a second orgasm is impossible

Approximately ___ percent of the mentally disturbed have no history of violence

a. 10 b. 20 c. 50 d. 90

Which of the following teachers is likely to be most effective?

A) one who spends much time disciplining students, thereby creating a quiet classroom B) one who understands that some students will not learn regardless of the type of instruction C) one who teaches students techniques for monitoring their own learning