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。
3.The teens go to sleep later than before because ________.
A.melatonin is secreted much later
B.melatonin regulates the sleep time
C.they sleep a lot in the daytime
D.they need to finish their homework
解析:选A 细节理解题。根据文章第三段中的“In teens, melatonin is secreted much later in the evening and continues to increase throughout the night.”可知,孩子们睡觉晚是由褪黑激素分泌晚造成的,故A项正确。
4.According to AAP's recommendation, middle and high schools should ________.
A.let teens sleep in the day
B.let the students be active
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