It is not unusual to see your desk-mate yawn (打呵欠) as he plains that he didn't have a good sleep the night before. Many teens don't get enough sleep because they have too much homework, which keeps them up at night. Some teens cannot sleep at night even when they want to.
Studies show that during your teenage years, the body's biological clock is reset, telling you to sleep later at night and wake up later in the morning.
But changes in the body clock aren't the only reason teens lose sleep. Lots of people have insomnia (失眠). The most mon cause of insomnia is stress. But all sorts of things can lead to insomnia. These include physical disfort, emotional troubles and even sleeping environment. It's mon for everyone to have insomnia from time to time. But if it lasts for a month or more go and see a doctor.
Some people have a condition that causes stomach acid (酸) to move backward towards the chest. This produces the unfortable, burning feeling called heartburn. So even if the person doesn't notice the feelings of heartburn because he is sleeping, he may feel tired the next day.
Most teens have nightmares sometimes. But, if they are frequent, a person's sleep pattern can be seriously affected. The most mon cause of nightmares is emotional problems, such as stress (压力) or anxiety. If you have them a lot, it's a good idea to talk to a doctor.
Doctors encourage teens to make lifestyle changes to develop good sleeping habits. You probably know that coffee can keep you awake, but did you know that playing video games or watching TV does the same?
【小题1】The main idea of the first paragraph is . A．There is a problem that teenagers can’t get enough sleep. B．Sleeping problems have different causes. C．Yawning is a good way to get rid of sleep. D．Teenagers care too much for homework.【小题2】The Teenagers’ biological clock . A．easily makes teenagers lead to insomniaB．is the origin of their insomniaC．provides them with plenty of time at nightD．is helpful to improve their concentration(注意力)【小题3】What does the writer say about “nightmares”?A．It is nothing and shouldn’t be taken seriously. B．It can release their stress or anxiety. C．Emotional problems are the only way to form nightmares. D．People will suffer from sleep if frequent.【小题4】Which way can help to get rid of insomnia?A．Drinking some coffee before going to bed. B．Playing video game or watching TV from time to time. C．Turning to a doctor for help. D．Eating much medicine for insomnia.A
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(答案→)A
解析：文章大意：看见同桌在打瞌睡不用奇怪，这是很正常的现象。研究表明，青少年的生物钟跟以往不一样了，总是让人晚睡晚起。
【小题1】A 主旨大意题。根据第一段he plains that he didn't have a good sleep the night before.可知青少年的睡眠很成问题，所以答案选择A。
【小题2】A 推理判断题。 根据文章第三段changes in the body clock aren't the only reason teens lose sleep.可推知生物钟的改变影响了学生的睡眠，很容易使他们失眠。所以答案选A。
【小题3】D 细节理解题。根据倒数第二段Most teens have nightmares sometimes. But, if they are frequent, a person's sleep pattern can be seriously affected.可知作者所提到的噩梦如果频繁发生，那人们就会从噩梦中遭受痛苦。根据句子The most mon cause of nightmares is emotional problems,说明情感问题是主要原因，但并不是唯一原因，所以C不正确。噩梦并不能缓解人的压力与焦虑，所以B不正确。答案选择D。
【小题4】C 细节理解题。根据最后一段句子You probably know that coffee can keep you awake, 说明A不正确。but did you know that playing video games or watching TV does the same?说明玩游戏和看电视也会影响睡眠，所以不是消除失眠的好方法，所以B不正确。吃太多的安眠药更是不行，所以D不正确。根据句子Doctors encourage teens to make lifestyle changes to develop good sleeping habits.可知向医生寻求帮助才是一种可行的方法来消除失眠，所以答案选C。