試題詳解

49. What can be inferred from the passage about people who are older than 15 years of age?
(A) They must have completed all of Piaget's stages of cognitive development.
(B) They are probably in the formal operational state of development.
(C)They have mastered deductive reasoning and are beginning to learn intuitively.
(D) They may still not be able to solve problems systematically. .