Heroin is the best known of the barbiturates

Research indicates that ____________ intelligence peaks in early to middle adulthood and then begins declining

A) crystallized B) fluid C) verbal D) existential

Which of the following children can likely dress and undress without supervision?

A) Shang, who is 2 years old B) Penelope, who is 3 years old C) Jason, who is 3½ years old D) Lillian, who is 4 years old