試題詳解

36.What is the main idea of this passage?
(A) Overpopulation results in deviant behavior in rats.
(B) Calhoun’s experiments have influenced many people.
(C) The social behavior of rats is seriously affected by overcrowding.
(D) Overall crowding, along with other factors, causes social pathology.
(E) Female rats are more easily affected by overcrowding than the male rats.