题目内容:
Paragraph6__________. A.Kripke'sresearchtool
B.Dangersofhabitualshortagesofsleep
C.CriticismonKripke'sreport
D.Awayofovercominginsomnia
E.Sleepproblemsoflongandshortsleepers
F.Classificationofsleepproblems
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答案解析: