22 What did researchers do to form a fearful memory of a tone in mice?
(A) The researchers gave mice a mild shock when the tone sounded.
(B) The researchers inserted proteins into the mice’s brains.
(C) The mice were shown pulses of light when hearing the tone.
(D) The scientists used different colors of light to activate the mice’s cells.

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統計： A(679), B(109), C(112), D(69), E(0) #2333940

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問題：研究者做了什麼去形成老鼠對於一個音...
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