39. One neurotransmitter associated with sleep, mood, attention, and learning is
(A) acetylcholine.
(B) nitric oxide.
(C) epinephrine.
(D) serotonin.
(E) melatonin.
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統計: A(2), B(0), C(4), D(30), E(12) #2973618
統計: A(2), B(0), C(4), D(30), E(12) #2973618