C．7 hours.

　　D．Less than 7 hours.

　　2、 What might happen if teens don’t get enough sleep？

　　A．They might not be able to finish their schoolwork.

　　B．Their bodies and brains might grow better.

　　C．They might do well in sports.

　　D．They might feel depressed.

　　3、The underlined word “insomnia” means “_______” in Chinese.

　　A．健忘癥

　　B．肥胖癥

　　C．多動(dòng)癥

　　D．失眠癥

　　4、 Which is NOT a reason why so many students don’t get enough sleep？

　　A．They cannot pay attention in class.

　　B．They have too much homework to do.

　　C．They have to get up very early to go to school.

　　D．They have sleeping problems.

　　5、Which of the following are good sleeping habits？

　　A. Sleeping in a bright place.

　　B. Going to bed at the same time.

　　C. Sleeping in a dark and quiet place.

　　D. Drinking something that makes you excited.

　　答案：BDDAC

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