The study surveyed 500 families and found the main problem people suffered was tiredness, followed by loneliness and anxiety.
A. domestic
B. public
C. psychological
D. biological
网友回答
A. domestic
B. public
(答案→)C. psychological
D. biological
解析：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。