What "programs" sighted people to sleep at night?A.A decrease in melatonin level.B.An incr
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What "programs" sighted people to sleep at night?
A.A decrease in melatonin level.
B.An increase in melatonin level.
C.Personal habits.
D.Psychological hint.
请帮忙给出正确答案和分析,谢谢!
