Are you carrying too much on your back at school?You're not alone．Back experts in the United States are worried that young students are having back and neck problems as a result of carrying too much 题目和参考答案——青夏教育精英家教网—

题目内容

15．Are you carrying too much on your back at school？You're not alone．Back experts in the United States are worried that young students are having back and neck problems as a result of carrying too much in their backpacks （schoolbags）．
"It hurts my back when I run，"said Oberlin Reyes，a student in Virginia．"It's hard to get up the stairs with my backpack，because it's too heavy．"
     Oberlin is among students whose backpacks were weighed for a week in a recent study．
     They had regular backpacks with two straps （带子） to carry them，but a number of students with heavy loads had switched to rolling backpacks （which have wheels and can roll on the ground）．Shirley Park，whose backpack weighed 10 kilograms，said she changed to a rolling backpack because she was starting to have back pain．How much is too much？Experts say students should carry no more than 10 to 15 percent of their own body weight．
     A few students had one suggestion to lighten the load：less homework．
     P．S．（附） Doctor's suggestion：
     ①Lighten the load．Clean out binders （活页材料） and take home only the books you need that night．
     ②Wide straps are better．They send out the weight over your shoulders more evenly （均匀）．And be sure to
       wear both straps rather than hanging the pack over one shoulder．
     ③Pack smart．The heavier things should be packed closed to the back
     ④Bend both knees when you pick up the pack，and don't just bend over at the waist （腰）．
51"D"is the main idea of the text．
A．The problem of backpacks is worth studying
B．The problem made by heavy backpacks
C．What is the best backpack for a student
D．How to make students'backpacks light
52．According to Oberlin Reyes and Shirley Park，we knowA
A．students have to do too much homework
B．students have to carry heavy backpacks
C．backpacks without wheels are bad for students
D．too much homework leaves students no free time
53．The expression"switched to"in the text perhaps meansA
A．started to use     B．turned to     C．caught up   D．used for
54．According to the passage，it's better for a student of 40 kilograms to carry a backpack ofC at most by the words of experts．
A.10 kg       B.8 kg        C.6 kg       D.7 kg
55．If students follows the doctor's suggestions，theyC．
A．may lighten their backpacks            B．can learn how to help themselves
C．may feel their backpacks are lighter     D．will know how to wear backpacks．

分析这篇短文主要描述了中美学生的书包都很重，这会对学生的身体造成不良影响．专家对此提出了建议，并号召老师和家长采取适当的措施．

解答 51-55 DAACC
51题答案：D 主旨题．根据第一段Are you carrying too much on your back at school？You're not alone．Back experts in the United States are worried that young students are having back and neck problems as a result of carrying too much in their backpacks （schoolbags）．本文主要谈论了美国学生们的书包里所背的东西太多太重，如何才能使学生们的书包减轻，故本题选D．
52题答案：A 细节题．根据第五段A few students had one suggestion to lighten the load：less homework．所表示的含义为学生有太多的作业从而导致书包太重，故本题选A．
53题答案：A 词汇题．根据第四段A number of students with heavy loads had switched to rolling backpacks前面许多背着很重东西的学生，后面可以在地上转动的书包，所以"switched to"的含义为开始使用的含义，故本题选A．
54题答案：C 细节题．根据第四段 Experts say students should carry no more than 10 to 15 percent of their own body weight．，所表示的含义为学生们所背的东西重量不要超过自身重量的百分之10到15，所以40公斤的学生背的东西重量不要超过6公斤，故本题选C．
55题答案：C 细节题．根据本文最后提到了医生的4点①Lighten the load．Clean out binders （活页材料） and take home only the books you need that night．②Wide straps are better．They send out the weight over your shoulders more evenly （均匀）．And be sure to wear both straps rather than hanging the pack over one shoulder．③Pack smart．The heavier things should be packed closed to the back④Bend both knees when you pick up the pack，and don't just bend over at the waist （腰）．减轻学生负荷的建议，如果学生采取，他们可能会减轻他们的书包重量，故本题选C．

点评题目涉及多道细节理解题，做题时结合原文和题目有针对性找出相关语句进行仔细分析，结合选项选出正确答案．推理判断也是要在抓住关键句子的基础上合理的分析才能得出正确的答案．

练习册系列答案

3．Different vitamins are found in different foods．Then which foods should be eaten to keep us healthy？Let's look at some important vitamins for the answer．

Vitamin A helps to protect skin from becoming dry．It is also helpful to the eyes．Without vitamin A，you cannot see well in darkness．Vitamin A is found in animal liver and yellow part of eggs．Sweet potatoes，carrots and other dark colored fruit and vegetables have something that the body can change into vitamin A．

Vitamin B changes foods into energy and helps the heart and nervous system（神经系统） to work smoothly．Without it，we will be weak and will not grow．It is found in grains and other foods like beans，nuts，meat and fish．
Vitamin B helps to produce red blood cells．It is found in foods like eggs，meat，fish，milk and green leafy vegetables．

Vitamin C is needed for strong bones and teeth，and for healthy blood vessels（血管）．It also helps wounds to heal（意合） quickly．The body stores little vitamin C，so we must get it in foods like oranges，and cabbage．

Vitamin D increases the levels of calcium（钙） in the blood．Calcium is needed for verve and muscle（肌肉） cells to work normally，as well as to build strong bones．Fish liver oil has vitamin D．In some countries，milk producers add vitamin D to milk so that it will be good for children．

36．WithoutA，We cannot see will in darkness．
A．vitamin A
B．vitamin B
C．vitamin C
D．vitamin D
37．According to the passage，vitamin B can be found inB．
A．fish liver oil
B．grains，meat and fish
C．milk and vegetables
D．animal liver and eggs
38．From the passage，we know that vitamin C is good forC．
A．the skin
B．the heart
C．blood vessels
D．nerve and muscles
39．Some milk producers add vitamin D to milk mainly to help children toC．
A．have good eyesight
B．produce blood cells
C．get enough calcium
D．heal wounds quickly
40．According to the passage above，which of the following is"TRUE"？D
A．We can get vitamins from everything．
B．We can live healthily with few vitamins
C．Vitamins are not important to our health．
D．Different vitamins can help us in different ways．

3．Pollution means adding dirty or harmful（有害的） things to land，air，water and so on．
As a result，they are no longer pleasant or safe to use．Pollution is bad for animals and plants，and it even makes people's health in danger．In our daily life，we can see different kinds of pollution in many places．There are three main forms of pollution：land pollution，air pollution and water pollution．
    Land pollution is caused by solid waste，such as cans，bottles and some plastic things which aren't broken down quickly．It makes the environment look very bad．However，air pollution is more serious than land pollution．It is much worse in cities and towns because of the fumes（废气） from traffic and the waste from human（人类的） activities．When people drive their cars，fumes which are most made up of CO2，NO2 and SO2 are given off．After the gases get into the air，they may mix wit h clouds．Then they will become some harmful chemicals falling on the ground with rain．It is one of the reasons for soil erosion（土壤侵蚀） which is one example of water pollution．
    Various kinds of pollution will cause many health problems．People have realized they must change this serious situation．There are many ways to control pollution．To develop alternative energy（替代能源）is very popular in many countries．China，for example，has made up its mind to be a leader in this field．It is trying hard to make full use of energy from the sun and wind．It has paid plenty of money to make electric cars and trains instead of traditional traffic．We should also take action to make our environment cleaner every day．Take cloth bags while going shopping and drive cars less．We have only one earth．We must take small steps no w to help protect our environment for the future wherever we are．

根据短文内容选择最佳答案．
46．The underlined word"solid"in the passage means"C"in Chinese．
A．气体               B．液体            C．固体
47．When people live in a polluted area，B．
A．they will control the use of alternative energy
B．their health will be in danger
C．they will get stronger and stronger
48．PictureAtells us how harmful chemicals pollute our environment．

49．Which of the following is TRUE according to the passage？C
A．There are only three forms of pollution．
B．China doesn't want to develop other kinds of energy．
C．Water pollution includes soil erosion．
50．The main idea of this passage should beA．
A．to introduce the kinds of pollution and the ways to control it
B．to introduce the harmful chemicals and soil erosion
C．to introduce the alternative energy and the ways to use it．

10．New Energy in the Twenty-first Century
Energy from the wind
Wind is a kind of clean energy，and there is lots of it，But，if there's no wind，there is no wind energy．
Energy from the water
When water moves from a high place to a lower place，it can make electricity（电）without pollution．However，people have to build dams（水坝） to use this energy，and building dams is very expensive．
Energy from the earth
There is heat in the rocks under the earth．Scientists use the heat to make geothermal（地热的）energy．This kind of energy is cheap，but it is only possible in a few places in the world．
Energy from the sun
Solar panels （太阳电池板） on the roofs of houses can turn energy from the sun into electricity．Solar power is clean and plentiful（丰富的）．but when the weather is bad，It doesn't work．

New Energy in Twenty-first Century

	Advantages	Disadvantages
Wind Energy	Clean．There is a lot．	It needs （57）wind．
Water Energy	（58）No pollution	It is expensive．
Geothermal Energy	（59）Cheap	only possible in a few places．
Solar Energy	Clean and plentiful．	It depends too much on （60）weather．

20．It's summer now and the weather is getting hotter．You are thirsty playing basketball or riding home from school．A cold drink may be just the thing．There are plenty of"energy drinks"on the market．Most of them have beautiful colors and cool names．The lists on them tell you they are helpful to your health．Sounds great!But be careful what you are drinking．Something that looks cool may not be good for your health．
After a careful check you may find that most energy drinks have lots of caffeine （咖啡因） in them．These drinks are especially aimed at （以…为目标） young people，students，busy people and sports players．Makers sometimes say their drinks make you better at sports and can keep you awake．But be careful not to drink too much．
Caffeine makes your heart beat fast．Because of this，the International Olympic Committee has limited （限制） its use．Caffeine in most energy drinks is at least as strong as that in a cup of coffee or tea．Possible health dangers have something to do with energy drinks．Just one box of energy drink can make you nervous，have difficulty sleeping and can even cause heart problems．Scientists say that teenagers should be discouraged from taking drinks with a lot of caffeine in them．

根据短文内容，选择最佳的答案．
71．The weather is gettingA
A．hotter       B．cooler      C．colder
72．Most of energy drinks have beautiful colors and coolC
A．maps       B．cards       C．names
73．Caffeine makes yourC beat fast．
A．ear         B．face        C．heart
74．Many people like drinking energy drinks for the following reasons except thatA
A．they have lots of caffeine
B．they can keep them awake and better at sports
C．they are said to be helpful to health
75．Which of the following can be the best title （标题） of the passage？C
A．What's the Use of Energy Drinks？
B．What's That in Energy Drinks？
C．Why Can't We Take Energy Drinks？

7．"I sometimes get up at three or four in the morning and I surf the net．"
"I often check my e-mail forty times a day．"
"I often spend more than three hours during one time on the net．"
"I spend more time in chat rooms than with my'real-life'friends．"
Do you know any people like these？They are part of a new addiction （癖好，沉溺） called Internet addiction．Internet addicts spend at least thirty to forty hours online every week．The use of the Internet can be an addiction like drug （毒品） use．People lose control （控制） of the time they spend on the Internet．
For example，one college student was missing for several days．His friends were worried，and they called the police．The police found the student in the computer lab：he was surfing the net for several days straight．
Studies show that about 6to 10% of Internet users become addicted．And people worry about the teens because the Internet is changing the playing field for some of them．They spend more time on the net than in the real world of friends and family．
Is"surfing the net"a hobby or an addiction for you？You may have a problem if you have these symptoms （症状）：
•You do not go to important family activities or you do not do school work because you like to spend hours on the Internet．
•You can't wait for your next online time．
•You plan to spend a short time online，but then you spend several hours．
•You go out with your friends less and less．

41．What can we learn from the first four sentences？D
A．Why to write this text．
B．Where to find an Internet addict．
C．How to become an Internet addict．
D．What an Internet addict often does．
42．According to the text，an addict is like aB
A．smoker B．druguser
C．policeman D．lazy student
43．The example in the text shows thatD
A．all Internet addicts don't sleep at all
B．all college students like Internet very much
C．the police often help to look for Internet addicts
D．some of the Internet users have already been seriously addicted
44．Why do people worry about the teens？D
A．The teens used to work on the Internet．
B．The playing field of the teens will disappear．
C．The teens waste too much money on Internet．
D．More and more teens will become Internet addicts．
45．What does the writer want to tell us？A
A．Don't be addicted to Internet．
B．Go to fatuity activities more．often．
C．Do things as you have planned．
D．Stay with your parents as often as possible．

4．Have you ever been annoyed with yourself when you forget something important？Maybe
you think you have a bad memory，Do you know your memory，can be developed？Here are
some ways for you to have a try．
★Be positive．Do not tell yourself your memory is bad，or your mind will believe it and you won't remember things easily．If you think you can，then you can
★Relax yourself．People are too nervous to remember things well．Relaxing will help you a
lot．Take deep breathe（深呼吸）and you can remember things easily．
★Think more．Things you know may help you to remember something new．For example，when you remember the word"classroom"，think of the old words"class"and"room"，it will help you remember quickly．
★Do more practice．Like your body，memory can be improved through exercise．The more times you practice，the more easily you will remember something．
★Eat healthy feed．Healthy eating can improve your memory．It is reported that fish is good for improving memory，so try to eat more fish from now on．

根据短文内容．判断下列各句正（T）、误（F）．
76．An active attitude is good for you to improve your memory．T
77．Relaxing is not useful for people Io develop memory．F
78．Something you already know may help you remember what you are learning．T
79．Memory can't be improved by practicing．F
80．If you want to have a better memory．，a healthy eating habit is very important．T．

5．-Do you have a TV？-______（　　）

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