A study found that at least one in four teens is tired and falls asleep in school at least once a week. During sleep, important body functions and brain activities happen. So how can teenagers get their sleep enough? The American Academy of Pediatrics (AAP) recommends that middle and high schools should start later — not before 8:30 am. This should give teens some more time to sleep at night.
语篇解读:本文是一篇说明文。早睡才能早起,晚睡会导致早上赖床,睡觉周期的改变实际上受制于大脑中一种被称为褪黑激素的荷尔蒙。
1.From Paragraph 2, we can learn that if you sleep late, the next day you should ________.
A.stay sharpB.skip breakfast
C.get up late
D.stay up late
解析:选C 细节理解题。文章第一段提到为什么孩子们早上不愿起床,第二段紧接着分析原因,说明孩子们睡觉晚是他们早上赖床的原因,故C项正确。
2.What does the underlined word “this” in Paragraph 3 refer to?
A.The students want to stay up.
B.The shifts of the sleep cycle.
C.The pineal gland secretes melatonin.
D.The adolescents sleep late.
解析:选B 代词指代题。第二段提到了睡觉周期的改变,第三段紧接着解释造成这一现象的原因,因此this指睡觉周期的改变,故B项正确。
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