定时训练(11).完形填空(2017·惠州高三模拟考试)When you are having class in the early morning yawning.He__1__that he didn't have a sound sleep the night before.Many__2__don't get adequate sleep because they are burdened with too much homework，which keeps them up at night doing countless exercise.Some teens cannot __3__ at night even when they want to so much.

　　Researches show that during your teenage years，the body's biological clock is__4__，telling you to sleep later at night and wake up __5__in the morning.But__6__in the body clock aren't the only reason teens lose sleep.Lots of people have insomnia(失眠)．The most common cause of insomnia is__7____8__discomfort，emotional troubles and even sleeping environment.It's common for everyone to have insomnia occasionally.But if it__9__for a month or more，go and consult a doctor.

　　Most teens have__10__ sometimes，which may make you sweat.But，if they are too frequent，a person's sleep pattern can be seriously__11__．The most common cause of them is emotional __12__—such as fear__13__．

　　Medical specialists encourage teens to make lifestyle changes to help them develop good sleeping__14__ .Most probably you know that a cup of coffee can keep you

　　__15__at night，but did you know that playing video games or watching TV does

　　the same?

　　【语篇导读】　本文讲述青少年的睡眠状况以及如何应对失眠问题。解析　“抱怨”昨晚没睡好。答案　D解析　学生是年轻人。答案　BA.study

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