阿摩線上測驗
10. In a famous experiment, Ivan Pavlov showed that dogs can be taught to _____ at the tick of a metronome.
(A) salivate
(B) salvation
(C) salve
(D) salvo
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統計： A(15), B(1), C(6), D(3), E(0) #3449293
統計： A(15), B(1), C(6), D(3), E(0) #3449293
