試題詳解

複選題
Which of the following statements can be inferred from the passage? 
(A)Mother rats usually take care of the pops. ‚
(B)Calhoun had experimented with rats before. ƒ
(C)The rats in the experiments have deviant behavior because they fought for necessities of life. „
(D)Calhoun manipulated the experiment so that the only factor that caused stress is overpopulation.