A-A+
Paragraph 4__________ 查看材料A.Keprikes research
问题详情
Paragraph 4__________ 查看材料
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请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：B
第三段表明了该段的中心是讲述“长期睡眠不足的潜在危险”。
