section_ⅰ welcome to the unit & 1．how many hours of sleep a day do the teenagers need on average? 2．why do students perform badly in the test in the early morning? 现在，许多国家的中学生都患有“睡眠缺乏症”，美国也不例外。不过，在美国越来越多的中学已经考虑推迟上课时间，让缺乏睡眠的孩子们多睡一会。 when klyce's alarm clock sounds at 5：45 a．m., the 17yearold rolls over and turns it off. without the second alarm clock that goes off at 6, she might have a much harder time getting to kennedy high school in fremont, calif for the 7：35 a．m. first bell. when she's running late, she goes without breakfast and doesn't do her hair. research shows that when teens hit puberty (青春期), they need 9 hours of sleep a day on average. now a growing number of schools are pushing back the morning bell so class time and students' energy are better balanced.
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