42. According to the passage, the experience of helplessness causes rats to _______.
(A) try to control unpleasant stimuli
(B) turn off the electricity
(C) behave passively in controllable situations
(D) become abnormally suspicious
(E) act madly as if being threatened
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統計: A(1), B(6), C(14), D(2), E(0) #971112
統計: A(1), B(6), C(14), D(2), E(0) #971112