複選題
37. 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.
(C) Stress does not occur in rat community unless there is overcrowding.
(D) The rats in the experiments have deviant behavior because they fought for necessities of life.
(E) Calhoun manipulated the experiment so that the only factor that caused stress is overpopulation.

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統計: A(146), B(69), C(99), D(101), E(144) #923420

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