Why is that many teenagers have energy to play computer games until late at night， but can't find the energy to get out of bed in time for school？ According to a new report， today's teenagers are getting so little sleep but their health is in danger．
This raises serious questions about whether being short of sleep is influencing children's ability to pay attention at school． Research has shown that losing even just half an hour's sleep at night can have deep influences on how children perform the next day．
So why aren't teenagers getting enough sleep？Some experts suggest that televisions， computers and mobile phones in children's bedrooms may cause problems．Instead of reading a book at bedtime，children are playing computer games，surfing the web，sending messages， or watching television．As these new pre-sleep activities have become more common，more traditional ones such as reading have become less，Dr．Luci Wiggs，a researcher at Oxford
University's Section of Child and Adolescent Psychiatry said，“One of the problems with these pre-sleep activities is that they do not have clear start and end times which leads to being short of sleep．”
Research has shown that teenagers have different sleep patterns from adults．Human bodies produce melatonin（褪黑激素）to help fall asleep． Most adults start to produce melatonin at
about 10 pm，while teenagers only begin to produce it three hours later．It is possible that this delay in melatonin production is caused by the behaviors of teenagers such as playing with phones late at night．
Problems about sleep- who needs how much and when -are usually connected to students' achievements． But modern brain researchers say it is time that more schools wake up to both biological and social facts and make a better timetable for their teenager students．
1.What can we learn from Paragraph 2？
A.It's very common for teenagers to have less sleep．
B.It doesn't matter if children sleep half an hour less．
C.Being short of sleep has influence on children．
D.A good night sleep at weekends helps children study well．
2.According to Dr．Luci Wiggs，．
A.too many pre-sleep activities take up teenagers' sleeping time．
B.playing computer games before bedtimes does harm to health．
C.fewer and fewer children read books at bedtime today．
D.teenagers shouldn't watch TV before they go to sleep．
3.What does the underlined word 'delay' mean？
A.Rushing． B.Changing． C.Putting off． D.Cutting off．
4.What can we infer from Paragraphs 4 and 5？
A.Schools need to offer more biology classes．
B.Teenagers may be kept awake by themselves．
C.Melatonin influences teenagers' achievements．
D.It's necessary for schools to start classes later．
5.Which can be the best title for this passage？
A.Wake Up Sleeping Teenagers
B.Let Sleeping Teenagers Lie
C.Keep Away From Electronic Products
D.How to Sleep
八年级英语阅读单选中等难度题
Why is that many teenagers have energy to play computer games until late at night， but can't find the energy to get out of bed in time for school？ According to a new report， today's teenagers are getting so little sleep but their health is in danger．
This raises serious questions about whether being short of sleep is influencing children's ability to pay attention at school． Research has shown that losing even just half an hour's sleep at night can have deep influences on how children perform the next day．
So why aren't teenagers getting enough sleep？Some experts suggest that televisions， computers and mobile phones in children's bedrooms may cause problems．Instead of reading a book at bedtime，children are playing computer games，surfing the web，sending messages， or watching television．As these new pre-sleep activities have become more common，more traditional ones such as reading have become less，Dr．Luci Wiggs，a researcher at Oxford
University's Section of Child and Adolescent Psychiatry said，“One of the problems with these pre-sleep activities is that they do not have clear start and end times which leads to being short of sleep．”
Research has shown that teenagers have different sleep patterns from adults．Human bodies produce melatonin（褪黑激素）to help fall asleep． Most adults start to produce melatonin at
about 10 pm，while teenagers only begin to produce it three hours later．It is possible that this delay in melatonin production is caused by the behaviors of teenagers such as playing with phones late at night．
Problems about sleep- who needs how much and when -are usually connected to students' achievements． But modern brain researchers say it is time that more schools wake up to both biological and social facts and make a better timetable for their teenager students．
1.What can we learn from Paragraph 2？
A.It's very common for teenagers to have less sleep．
B.It doesn't matter if children sleep half an hour less．
C.Being short of sleep has influence on children．
D.A good night sleep at weekends helps children study well．
2.According to Dr．Luci Wiggs，．
A.too many pre-sleep activities take up teenagers' sleeping time．
B.playing computer games before bedtimes does harm to health．
C.fewer and fewer children read books at bedtime today．
D.teenagers shouldn't watch TV before they go to sleep．
3.What does the underlined word 'delay' mean？
A.Rushing． B.Changing． C.Putting off． D.Cutting off．
4.What can we infer from Paragraphs 4 and 5？
A.Schools need to offer more biology classes．
B.Teenagers may be kept awake by themselves．
C.Melatonin influences teenagers' achievements．
D.It's necessary for schools to start classes later．
5.Which can be the best title for this passage？
A.Wake Up Sleeping Teenagers
B.Let Sleeping Teenagers Lie
C.Keep Away From Electronic Products
D.How to Sleep
八年级英语阅读单选中等难度题查看答案及解析
You have spent too much time playing computer games.That's________ your eyes hurt.
A.why B.how C.what D.when
八年级英语单选题中等难度题查看答案及解析
根据句意，用括号中所给单词的适当形式或句子的语法要求填空。
1. Playing too many computer games is ▲ (harm) to you.
2. We should speak to the old man ▲ (polite).
3. —How many ▲ (tooth) does a dog have?
—Sorry, I have no idea. Let’s search on the Internet.
4. A computer is ▲ (expensive) than a TV set.
5. Have you read ▲ (today) newspaper?
6. I ▲ (not go) to bed until my mother came back at ten last night.
7. You need ▲ (return) the comic book to the library at once.
8. My sister ▲ (be) a singer since she left the school.
八年级英语其他题中等难度题查看答案及解析
My teachers advise us ________ computer games. That is bad for our eyes.
A. to play B. playing
C. not to play D. not play
八年级英语单选题中等难度题查看答案及解析
—Dad, why must I stop ____ computer games?
—For your health, my boy.
A. play B. to play C. to playing D. playing
八年级英语单项填空中等难度题查看答案及解析
—Dad,why must I stop computer games?
—For your health,my boy.
A. play B. to play
C. playing D. to playing
八年级英语单选题中等难度题查看答案及解析
—______do you usually use the computer_______?
— Playing games．
A.Why; for B.What; to C.Why; to D.What; for
八年级英语单选题中等难度题查看答案及解析
（题文）It’s believed that playing computer games too much does ___________ harm than good.
A. many B. much C. more D. most
八年级英语单选题中等难度题查看答案及解析
— Mom, why must I stop ______ the computer games?
— For your health, my dear.
A. play B. to play C. to playing D. playing
八年级英语单选题中等难度题查看答案及解析
—Dad, why must I stop______ computer games ?
— For your health , my boy.
A. play B. to play
C. to playing D. playing
八年级英语单项填空中等难度题查看答案及解析