A Kripke’s Research Too1 B Dangers of Habitual Shortages of Sleep C Criticism on Kripke’s Report D A Way of Overcoming Insom

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问题 A  Kripke’s Research Too1
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
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答案C

解析 本题答案的依据是第四段:“...one report demonstrated that people who habitually sleep less than 7 hours each night have a higher risk of dying within a fixed period than people who sleep more.”
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