Most teens have nightmares sometimes.But，if they are frequent，a person’s sleep pattern can be seriously affected.The most common 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?

　　1．The main idea of the first paragraph is

　　.

　　A．teenager can’t get enough sleep at all

　　B．sleeping problems have different causes

　　C．yawning is a good way to get rid of sleep

　　D．teenagers care too much for homework

　　2．The teenagers’ biological clock

　　.

　　A．easily makes teenagers lead to insomnia

　　B．is the origin of their insomnia

　　C．provides them with plenty of time at night

　　D．is helpful to improve their concentration

　　3．Which way can help to get rid of insomnia?

　　A．Drinking some coffee before going to bed.

　　B．Playing video games or watching TV often.

　　C．Turning to a doctor for help.

　　D．Eating much medicine for insomnia.

　　1．A　[段落大意题。根据第一段“It is not unusual to see your deskmate yawn...Some teens cannot sleep at night even when they want to.”可知，青少年们无法获得足够的睡眠。]

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