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The study surveyed 500 families and found the main   problem people suffered was tiredness, followed by loneliness and anxiety.
A.domesticB.publicC.psychological D.biological
C
词义辨析。  A.国内的 B.公共的     C.心理学的;精神上的   D.生物的;生物学的。句意:这个研究调查500个家庭,发现人们忍受的主要的精神问题是疲劳,其次是孤独和焦虑。故选C。
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