At low levels, alcohol's effect on the brain is __________; at higher levels, alcohol's effect is __________.
A. to inhibit glutamate (an excitatory neurotransmitter); to release opiumlike endorphins
B. too minimal to have an impact; massive and excitatory
C. depressive; excitatory
D. to activate the brain's "pleasure centers"; to depress brain functioning
Answer: D
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