下面文章中有5处需要添加小标题。请从以下选项（A、B、C、D、E和F）中选出符合各段意思的小标题。选项中有一项是多余选项。
A. Kripke’s Research Tool
B. Dangers of Habitual Shortages of Sleep
C. Classification of Sleep Problems
D. A Way of Overcoming Insomnia
E. Sleep Problems of Long and Short Sleepers
F. Oversleeping — Too Much of a Good Thing
小题1:______
Although the dangers of too little sleep are widely known, new research suggests that people who sleep too much may also suffer the consequences.
小题2:______
Investigators at the University of California in San Diego found that people who clock up 9 or 10 hours each weeknight appear to have more trouble falling and staying asleep, as well as a number of other sleep problems, than people who sleep 8 hours a night. People who slept only 7 hours each night also said they had more trouble falling asleep and feeling refreshed after a night’s sleep than 8-hour sleepers.
小题3:______
Previous studies have shown the potential dangers of chronic(慢性的) shortages of sleep — for instance, 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.
小题4:______
For the current report, Kripke reviewed the responses of 1,004 adults to sleep questionnaires, in which participants indicated how mush they slept during the week and whether they experienced any sleep problems. Sleep problems included waking in the middle of the night, arising early in the morning and being unable to fall back to sleep, and having tiredness interfere with day-to-day functioning.
小题5:______
Kripke found that people who slept between 9 and 10 hours each night were more likely to report experiencing each sleep problem than people who slept 8 hours. In an interview, Kripke noted that long sleepers may struggle to get rest at night simply because they spend too much time in bed. As evidence, he added that one way to help insomnia is to spend less time in bed. “It stands to reason that if a person spends too long a time in bed, then they’ll spend a higher percentage of time awake,” he said.
小题1:F
小题2:E
小题3:B
小题4:A
小题5:D
题目分析：
小题1:信息句...people who sleep too much may also suffer the consequences中consequences指的是前面提及的danger,抓住信息词 sleep too much及suffer可以推断出睡眠过度也会导致危险，故选F
小题2:根据句意，调查显示一晚睡9-10个小时和睡7个小时的人均有一系列睡眠或其它问题较之睡8小时的人，故E符合。
小题3:从信息词the potential dangers of chronic(慢性的) shortages of sleep 可知选择答案B
小题4:从信息句Kripke reviewed the responses of 1,004 adults to sleep questionnaires,中的关键词 sleep questionnaires可知是谈论Kripke 的研究工具，故选A
小题5:从信息句one way to help insomnia is to spend less time in bed 可知正确答案为D
点评：给科普类文章找小标题，也属于主旨题型一类。其测试目的也是为了考查考生对文章主题的理解。但是，相对于主旨题而言，需要考生具备更强的概括能力。在处理这类题型的阅读理解题时，考生也必须通读全段，抓住或概括文段的信息句或信息词，然后根据命题者所提供的选项，排除不合理选项（这些选项有时概括得过于宽泛，超出了文段的内容，有时又过于狭窄或过于偏颇。）然后比对选项，即可以找到对应的答案。