13. The major inhibitory neurotransmitter of the human brain is__________.
(A) acetylcholine
(B) epinephrine
(C) endorphin
(D) nitric oxide
(E) GABA
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統計: A(2), B(1), C(1), D(1), E(64) #3082772
統計: A(2), B(1), C(1), D(1), E(64) #3082772