Module 1 Our Body and Healthy Habits
阅读理解提速练——练速度
(限时:20分钟)
A
(2016·衡水一中高考模拟)It is 7 am and the alarm is going off. You know you have to be out of bed to catch the bus. But the urge to bury yourself in the bed is ever so strong.
Sounds familiar? Why is it that teens find it difficult to get themselves out of bed in time every morning or stay sharp and focused during the first couple of hours of school?
During adolescence, the body goes through many changes and these include a shift in sleep patterns. Researchers from MIT have been tracking the body's need for sleep in teenagers. They found that though adolescents need as much as 9.5 hours of sleep a day, they get to bed later and later with each passing year. In fact, the sleep cycle shifts later by as much as 12 to 18 minutes each year between the ages of 10 and 20! So by the time a 10yearold who sleeps at 8 pm grows to be 17 or 18, his body naturally wants to stay up till 10:30 pm or 11 pm.
According to researchers, this is because of a hormone called melatonin (褪黑激素) that is secreted (分泌) by the pineal gland — a tiny structure deep inside the brain. Melatonin regulates the body's natural daynight rhythms. It causes a person to become sleepy by lowering his body's core temperature. In teens, melatonin is secreted much later in the evening and continues to increase throughout the night. This makes it difficult for teens to fall asleep earlier as they did in their younger years. Likewise, the effect of melatonin continues until much later in the morning, making it hard for them to wake up early.
【2017届高考英语一轮复习跟踪检测:必修2 Module 1 Our Body and Healthy Habits(外研版)】相关文章:
★ 2014届高考英语一轮复习课时作业(八)必修2Module 2《No Drugs》(外研版)
★ 【北京专用】2014届高考英语一轮复习方案课时作业:选修7 Unit 4 Sharing
★ 【北师大版】2014届高考英语一轮复习指导课时作业:Unit 2 A卷 Word版含解析
★ 【三维设计】2017届高考英语(江苏专用)二轮复习课件:必修4 Unit 3《Tomorrow’s world》
★ 【浙江专用】2014届高考英语一轮复习课时作业(十六)必修4Unit 1《Women of achievement》
★ 北京市2014高考英语一轮复习 练习手册(31)选修7 Unit 1 Living well(含解析)新人教版
★ 【浙江专用】2014届高考英语一轮复习课时作业(九)必修2Unit 4《Wildlife protection》
最新
2017-04-24
2017-04-24
2017-04-24
2017-04-24
2017-04-21
2017-04-21