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!
What is wrong with the womans current apartment?A.It is too noisy B.The walls are too thin C.The buses do not go in that direction D.The boiler often goes wrong 请帮忙给出正确答案和分析,谢谢!