8．Up to 65% of children don't get as much sleep as they should do，and this can make them nervous and slower at school，scientists say．
So how long should young people sleep each night？The answer is between eight and ten hours．If you don't get enough sleep at night，you'll have less energy the next day．
But the scientists say many children have missed out on 4，500hours of sleep by the time they are seven years old．They say that children miss sleep because they have TVs and computers in their rooms，and busy parents don't read to their younger children at night any more．The traditional"bedtime story"helps children to relax and fall asleep peacefully．Children with TVs and computers in their bedrooms were more likely to sleep badly，and to get less than eight hours'sleep．Even losing one hour's sleep a night can mean that children do less well at school．
German scientists think that your brain （大腦） keeps working while you are asleep．To show that they were right，they gave two groups of people a problem to work out．One group went to sleep，and the other group stayed awake．The result？The people who slept worked out the answer more quickly．This showed that their brains had been trying to find the answer while the people were asleep．So，make sure you get enough sleep tonight，and you'll be at your best tonight，and you'll be at your best tomorrow!

51．What problem do more than a half of students have？B
A．They don't get on well with their studies．B．They don't  have enough sleep at night．
C．They don't relax themselves at school．D．They don't follow their school rules
52．If you have less energy the next day，you'll probably feelA．
A．sleepy，slow and nervous             B．tired，bored and worried
C．a(chǎn)fraid，alone and angry               D．dull，lazy and crazy
53．According to the third paragraph，what has worst influenced many children's sleep？D
A．Their parents'noise．B．Bedtime stories．
C．Too much homework                  D．TV and computers
54．The German scientists'experiment showed thatC．
A．our study depends on our sleep           B．our sleep helps improve our health
C．our brain works while we sleep           D．our brain works faster during sleep
55．This passage in mainly written forD．
A．parents      B．school teachers      C．scientists     D．young students．

分析 短文講了現(xiàn)在65%以上的孩子缺少睡眠，這會使他們感到困乏，緊張而且反應(yīng)緩慢，并舉例說明造成睡眠不足的原因，建議人們要有充足的睡眠，才能夠做的更好．

解答 答案：51．B  細節(jié)理解題．根據(jù)第一段句子Up to 65% of children don't get as much sleep as they should do，65%以上的兒童沒有足夠多的睡眠，可知在晚上他們沒有足夠的睡眠．故選B．
52．A  細節(jié)理解題．根據(jù)第一段句子 this can make them nervous and slower at school，scientists say．科學(xué)家說，這可能導(dǎo)致他們在學(xué)校緊張不安而且反應(yīng)緩慢．可知如果第二天你沒有足夠的精力，你會感覺困，緊張不安而且反應(yīng)緩慢．故選A．
53．D   細節(jié)理解題．根據(jù)第三段第三行句子Children with TVs and computers in their bedrooms were more likely to sleep badly，and to get less than eight hours'sleep．房間里有電視和電腦的孩子更有可能睡得不好，睡眠少于八個小時．可知電視和電腦影響孩子的睡眠．故選D．
54．C  細節(jié)理解題．根據(jù)最后一段第一句German scientists think that your brain （大腦） keeps working while you are asleep．德國科學(xué)家認為在你睡覺的時候，你的大腦一直工作．可知德國科學(xué)家認為在我們睡覺的時候，我們的大腦一直工作．故選C．
55．D   細節(jié)理解題．根據(jù)整篇文章內(nèi)容及其第一段句子Up to 65% of children don't get as much sleep as they should do，and this can make them nervous and slower at school，scientists say．65%以上的兒童沒有足夠多的睡眠，科學(xué)家說，這可能導(dǎo)致他們在學(xué)校緊張不安而且反應(yīng)緩慢．可知這個短文是寫給學(xué)生的．故選D．

點評 在通讀全文的基礎(chǔ)上，根據(jù)全文大意，展開邏輯思維，瞻前顧后，認真觀察選項，仔細推敲，確定最佳答案．

練習(xí)冊系列答案
相關(guān)習(xí)題

科目：初中英語 來源： 題型：閱讀理解

15．There is a serious problem to our earth．That's warming．It's true that the carbon dioxide （二氧化碳）put up into the air is warming the earth．It is clear that average （平均）temperature has risen over the last century．Not everyone can believe that carbon dioxide is the main reason．A new study shows it is not all the fault （過失）of the carbon dioxide．Some scientists studied the sun and found that when the sun becomes more active，the earth warms up．When the sun quiets，temperature goes down．Some scientists aside the sun's change may be more important than carbon dioxide in warming the earth．
We can't change the sun．So in order mother to make  the earth warm up，what we can do is to control （控制）the amount of giving off carbon dioxide into the air directly （直接的）．We should ride a bike or walk when we go out．It is not only good for our environment，but also good for our health．

61．What makes the earth warmer and warmer？A
A．Carbon dioxide     
B．Waste water      
C．Scientists
62．The average temperatureA over the last century．
A．has gone up     
B．has gone down     
C．has changed a lot
63．When does the earth warm up？B
A．When the sun becomes bigger．
B．When the sun becomes more active．
C．When the sun becomes quieter．
64．What can we do to the earth's warming up according to the writer？C
A．Give off less carbon dioxide．
B．Quiet the sun   
C．Ride a bike
65．Which is the best title for the passage？C
A．Carbon Dioxide    
B．Stop Giving Off Carbon Dioxide   
C．The Earth Is Warming Up．

查看答案和解析>>

科目：初中英語 來源： 題型：選擇題

16．--What are you reading，Tom？
--A letter _____ by my new e-pal from America．（　　）
A．was sentB．sentC．has been sent

查看答案和解析>>

科目：初中英語 來源： 題型：閱讀理解

16．According to a survey，students'safety has become a big problem．Nearly 50% of students say they are worried about robbery on the way to and from school．Now in main big cities in China，some schools have taught anunusual lesson：self-protection．Students like this lesson because there are noexams or boring classes．And they can learn how to save lives and know how tostop danger before it really happens．
    ChenHaoyu，a teacher at Beijing No.25 Middle School，gives young students adviceon how to deal with danger．
    If you are robbed
    Keep calm．If you can not cry for help orrun away，give the robber your money．Try to remember what the robber lookslike and tell the police later．
    If you are in a traffic accident
    If a car hits you，you should remember the carnumber．If it is a bicycle，try to call your parents before you let the ridergo．This is because you don't know how seriously you are hurt．
   If it is raining hard and there is lightning
   Don't stay in high places and stay away fromtrees．
   When there is a fire
    Get away as fast as you can．Put wet thingson your body and try to find an exit．Do not take the lift．
    If someone is drowning
    If you can't swim，don't get into thewater，cry out for help．
    Remember that danger is never so far awayas you think．Take care of yourself at all times!

59．Why do students like the self-protection lesson？D
①?Because there are no tests．
②?Because the lessons are boring．
③?Because they can learn how to save lives．  ④Because they can know how to stop danger beforeit happens，
A．??①②
B．②③??
C．①②??④
D．①③??④
60．What will you do ifa bicycle hurts you？B
A．I will remember the bicycle number．
B．I won't let the rider go until I call myparents．
C．I will let the rider go before I call myparents．
D．I will let the rider go because I knowthe rider．
61．If your house is on fire，you mustC．
A．put dry things on your body
B．run quickly and take the lift
C．run away and find an exit as quickly asyou can
D．take everything you have and then runaway
62．Which of the following is the best title for this passage？A
A．Self-protection                       
B．How to keep calm
C．A Usual Lesson                      
D．Danger．

查看答案和解析>>

科目：初中英語 來源： 題型：閱讀理解

3．This March，the H7N9virus （病毒） hit Shanghai，Anhui，Jiangsu，Zhejiang and so on．It seemed that most people who were infected（被感染） with H7N9had the common flu．Some people suffered from a fever or a cough．Don't be afraid-it's not easy to be infected with the virus．Here is some advice to help you protect yourself when it comes．
Wash your hands．You need to wash your hands with soap and hot water before you eat，after you use the toilet，and after you touch animals，because your hands may carry viruses．
Cover your nose and mouth．When someone sneezes（打噴嚏） or coughs，flu viruses can travel as far as one meter through the air，so you'd better stand a proper distance （距離） while talking to someone who has a cold．And always cover your mouth and nose with a piece of paper when you sneeze or cough，and then clean your hands．
Wear a mask（口罩）．Some doctors say that masks can stop the flu as much as 80%，but if you don't wash your hands often，it's no use wearing a mask．And it's necessary to wear the mask in the groups of people．
Do sports often．Exercises will help make your body strong enough to  resis the
 virus．

51．When did the H7N9virus hit Shanghai？A
A．In March，2013．   B．In May，2013．   C．In March，2012．
52．Which of the following is TRUE according to the passage？B
A．Some people who were infected with the H7N9virus had a toothache．
B．You should cover your mouth and nose with a piece of paper when you sneeze or cough．
C．Some doctors say that masks can stop the flu as much as 100%．
53．How many ways to stop the virus are mentioned in the passage？B
A．Three．   B．Four．   C．Five．
54．What does the underlined word resist"mean in Chinese？A
A．抵抗   B．傳播   C．感染
55．What's the main idea of this passage？C
A．It tells us how to wash hands．
B．It tells us why we should use masks．
C．It gives us some advice on how to protect ourselves when the H7N9virus comes．

查看答案和解析>>

科目：初中英語 來源： 題型：閱讀理解

13．SUMMER SKIN CARE
-RIGHT OR WRONG？
In summer everybody needs to be careful with the sun．Do you know how to spend time in the sun without burning or damaging your skin？Read the ten rules below．Some of them are RIGHT and the others are WRONG．
①Always wear a baseball cap．It protects you from the sun and looks cool，too．
WRONG You need to wear a hat，but choose your hat carefully．Baseball caps protect your eyes，but they don't protect your ears or your neck．Use a proper sun hat．
②Use sun cream．You need to put it on at least twenty minutes before you go out．
RIGHT Sun cream starts to work twenty minutes after you put it on．
③Put sun cream around your eyes and on your eyelids to protect them from the sun．
WRONG Sun cream hurts the eyes．Wear sunglasses instead．
④You only need a little sun cream．Too much sun cream is bad for your skin．
WRONG You need to use a lot of sun cream．The sun dries out your skin．Sun cream moisturizes（滋潤） and protects it．
⑤Put more sun cream on every two hours．
RIGHT You need to put sun cream on often，especially when you're swimming．
⑥You need to use sun cream even on a cloudy day in summer
RIGHT The sun can damage your skin even
⑦On a hot sunny day，wear light-colored clothes-white or yellow are best．
WRONG Light-colored clothes don't protect you from the sun．The best solution is to wear dark-colored
⑧You need to spend time in the sun for healthy skin．
RIGHT You need to spend time in the sun to get enough vitamin D for healthy skin and bones（骨頭），but don't forget to use sun cream．Without sun cream you have a bigger risk of skin cancer．
⑨You need to spend a lot of money to get a good sun cream．
WRONG There are many different kinds of sun cream．Find the one that is best for you．Expensive ones are not always better than cheap ones．Use a sun cream labeled（標(biāo)明）SPF30+and it should give you the same protection as one that is more expensive．
⑩In summer，people with dark skin can also get burnt．
RIGHT People with fair skin and blonde or red hair need to be extra careful and use a high factor sun cream．People with fair skin，but they do need to protect their skin from the sun，too．

50．What are the right clothes to protect your skin from the sun？D
A．A baseball hat and light-colored clothes．
B．A baseball hat and dark-colored clothes．
C．A sun hat and light-colored clothes．
D．A sun hat and dark-colored clothes．
51．Where shouldn't you put sun cream on your body？B
A．On your ears and neck．
B．Around your eyes and eyelids．
C．On dry skin．
D．On darker skin．
52．What is the right way to use sun cream？C
A．Use a little and often            
B．Use a lot，two or three times a day．
C．Use a lot every two hours．
D．Use a little every two hours．
53．Why is it important to spend time in the sun？D
A．You can drink more water．
B．It improves dry skin．
C．It's a chance to wear cool sunglasses．
D．It helps keep your skin and bones healthy．
54．According to the text which of the following is true about sun cream？C
A．Sun cream is usually very expensive．
B．Black people don't need sun cream．
C．Sun cream reduces the risk of skin cancer．
D．Sun cream starts to work immediately．

查看答案和解析>>

科目：初中英語 來源： 題型：填空題

20．閱讀短文，根據(jù)短文內(nèi)容及首字母提示，在空白處填入一個適當(dāng)?shù)膯卧~，必要時進行詞形變化．
Making friends is a skill．Like most skills，you can improve it if you are patient．If you want to meet people and makes （61）friends，you must be willing to take action．You must first go where there are people．You won't make friends staying home alone．
Joining a club（62）or a group，talking to those who like（63）the same things as you do is much easier．Or join someone in some activities．
Many people are nervous when you talk（64）to new people．After all，meeting strangers means seeing the unknown．And it's human nature to feel a bit unpleasant about the unknown．Most of fears about dealing with new people come from doubts（懷疑） about ourselves．We imagine other people are judging us-finding us too tall or too short，too this or too that．But（65）don't forget that they must be feeling the same way．Try to accept yourself as you are，and try to make others feel at home．You'll all feel more confident（66）．
Try to be brave even if you don't feel that way when you enter（67）a room full of strangers．Walk straight，look directly at other（68）people and smile．
If you see someone you'd like to speak to，say something．Don't wait for（69）the other person to start a conversation．
Just meeting someone new does not mean that you'll make friends with that person．Friendship is based on mutual（相互的） likings and"give and take"．It takes（70）time and effort（精力） for us to develop friendship．And there are things that stop a new friendship from growing．

查看答案和解析>>

科目：初中英語 來源： 題型：填空題

17．我認為好朋友使我開心．
I think a good friendmakesmehappy．

查看答案和解析>>

科目：初中英語 來源： 題型：填空題

18．Thereis （be） some milk in the cup．

查看答案和解析>>

同步練習(xí)冊答案