Paragraph 4______A.Keprike’s Research ToolB.Dange
已帮助 人
Paragraph 4______
A.Keprike’s Research Tool
B.Dangers of Habitual Shortages of Sleep
C.Criticism on Kripke’s Report
D.A Way of Overcoming Insomnia
E.Sleep Problems of Long and Short Sleepers
F. Classification of Sleep Problems
-
答案：B
第四段只有一句话：Previous studies have shown the potential dangers of chronic shortages of sleep , for instance…这句话表明了该段的中心是“长期睡眠不足的潜在危险“。因此选B。