Do you like Physics or Chemistry？ Matter （物质） is always changing， either physically or chemically． If a material goes through a physical change， it is still the same material． During a chemical change， one kind of matter changes into another completely different kind of matter． For example， when we burn wood or cook fish， materials change． People use chemistry every day in the kitchen． The food we eat has many different natural chemicals． Many of the chemicals in food are necessary parts of a healthy diet．
Much of the food we eat has been changed in some way from its original form． The changes that food undergoes may be chemical or physical． If a change does not affect the food's chemical composition， we call it a physical change． For example， melted （溶解的） cheese has gone through a physical change． It gets softer when it is heated but it is still the same type of material． Any change that changes the chemicals in the food is a chemical change． Bread contains carbohydrates， which are chemicals made up of carbon， hydrogen， and oxygen． When bread is baked （烘焙）， the carbohydrates break down into black carbon and water． The carbon gives the bread a dark color and a crunchy texture （质地）． The water goes into the air．
To get a closer look at the chemistry of baking， let's watch how a carrot cake is made． The main steps of baking any cake are mixing the ingredients （材料） and baking them together． In the course of making cakes， the dry ingredients are mixed first． They are flour， sugar， salt， baking soda， baking powder and spices． Flour gives the cake structure． Sugar helps to make it sweet． Salt strengthens the cake batter． Baking powder and baking soda make the cake rise．
Next， the carrots may be added to the cake． These help give the carrot cake its flavor， texture， and color． The other ingredients in the carrot cake are oil and eggs． The oil makes the cake tender and moist． Eggs serve two purposes﹣the whites help the cake to rise， while the yolks （蛋黄） give it a creamy texture． All of these ingredients form a mixture． This mixture can be separated into its different components （成分） although it is very difficult． Once the cake mixture is formed， it's poured into a cake pan and baked in an oven． The heat from the oven has caused chemical changes to take place． The cake is finished and the ingredients cannot be separated．
（1）The material doesn't change when we ．
A． melt ice cream
B． burn paper
C． bake apple pies
D． cook beef
（2）What's the correct order of baking a carrot cake in the passage？
a． Carrots， oil and eggs are added．
b． The dry ingredients are mixed．
c． The mixture is baked in an oven．
d． Baking powder and soda make the cake rise．
e． Preparing some dry ingredients．
f． The heat from the oven causes chemical changes．
g． The ingredients cannot be separated．
h． The mixture is poured into a pan
A． b﹣a﹣h﹣f﹣g
B． b﹣h﹣c﹣d﹣f
C． e﹣d﹣c﹣a﹣g
D． e﹣c﹣a﹣g﹣d
（3）After reading the passage， we know that ．
A． water and carbon can give the cake a dark color and a crunchy texture
B． people can separate the mixture of eggs and oil into different components
C． chemicals in different kinds of food that people eat are bad for their health
D． sugar and salt can't be put into the mixture to make a cake at the same time
（4）The passage mainly helps us to ．
A． look at the steps of baking cakes closely
B． learn how to make carrot cakes at home
C． have a healthy diet with natural chemicals
D． understand physical and chemical changes
Recently children have been told to buy traditional alarm clocks instead of mobile phones to wake them up in the morning． Schools will advise pupils to turn off mobile phones or iPads in the evening to have enough sleep．
Researchers from a charity say that using internet﹣connected devices（装置）in the evening can prevent children getting more rest． Moreover， they suggest that school children should invest in a real alarm clock to make sure that they get a good night's sleep and arrive at school on time．
①_____． The result is that 40% pupils in secondary schools can now hardly get on well without these devices． About two﹣thirds of pupils have a habit of taking mobile phones to bed at night．
②______．The study also shows that girls are more likely to be attracted by mobile phones than boys， and often use the Internet to talk to friends by social networking websites， such as Facebook and Twitter． One girl aged 12 said， "I have been told that I am addicted（上瘾的）to the Internet， and prefer being online to being with other people．"
③_______．A girl of 13 told researchers， "I can't imagine if someone takes my iPad away． I walk around the house with it even though it's not turned on． I just like being with it．" Another girl added， "Sometimes I can't sleep without using the mobile phone at night．"
④______．The charity， which was set up to promote（推动）iPads in the classroom， has now given five suggestions to protect children from being affected by electronic（电子的）devices．
（1）To get a good night's sleep， school pupils are asked to buy ．
A． iPads
B． alarm clocks
C． mobile phones
D． electronic devices
（2）The underlined words "invest in" in Paragraph（段落）2 mean ．
A． hand out
B． hand in
C． spend time on
D． spend money on
（3）It is better to put "A study of about 3000 pupils shows that almost half feel to be controlled by electronic devices" in ．
A． ①
B． ②
C． ③
D． ④
（4）From the passage， we can learn that ．
A． most pupils turn off their mobile phones in the evening
B． using mobile phones can make children get more rest
C． one﹣third of pupils get used to sleeping with mobile phones
D． girls are more interested in using mobile phones than boys
（5）What will be talked about in the following paragraph？
A． Examples of boys．
B． More information about the charity．
C． The tips given to children．
D． Instructions about electronic devices
Around the world， people live in homes of many shapes and sizes． In some countryside， people live together with their family in a huge house with gardens or backyards． On the other hand， the buildings in cities are usually very close together．
A home can be any kind of building﹣ large or small． Some people even have homes on boats， in tents or in caravans that can be moved around． Caravans are mobile homes． They are towed（拖，拉） by either a car or a huge truck． Some of them are holiday homes． We can see many families staying together in these caravans．
In the past， rich and important people built strong castles to keep their families safe． The castles（城堡） were built on hill tops with high walls and some even had moats． Moats were deep and wide ditches（壕沟） filled with water． They made it difficult for enemies to attack．
Today， we have different ways of protecting our homes． Some homes are installed（安装） with video cameras and an alarm system． These will help to alert（向……报警） home owners if someone tries to break in．
Homes are important to all the people． Everyone needs a home where they feel sheltered and safe．
（1）How are the buildings in cities？
（2）What is used to tow the caravans？
（3）Who built castles to keep their families safe in the past？
（4）Why were moats built？
（5）What do people use to protect their homes today？
If we want to grow as people，we can't just depend on our own evaluation（评价）of how we're doing.We also need to know what other people think about our performance.Receiving feedback（反馈）from others can help us see the larger picture and show us a way forward to success.However，someone has to give that feedback，and sometimes，that someone will be you.How should you deal with this？
First things first-if you notice a situation in which some feedback would be helpful，give it as soon as you can.If you wait until the matter disappears from the person's mind，they might not understand what you're trying to tell them.Take the person to a safe，comfortable place and offer your advice in private.
When you're giving feedback，it's important to keep in mind that no one likes to be told they're doing a bad job.Make sure you give an equal（相等的）amount of good feedback to balance out（平衡）anything bad.Like the saying goes， " A spoonful of sugar helps the medicine go down."
All good feedback shares something in common.First，it should help achieve a goal.It's less useful to tell your friends that their dish tastes "interesting" than it is to suggest adding a little salt.Feedback should also look toward the future.You can't change what's already happened，but you can prevent it from happening again.Tell your friends they should take more notes in class instead of talking about how they should have studied harder for the big history exam they failed.
Finally，don't think your suggestion is the only correct way to deal with a situation.You might even end up with some feedback on your feedback.Don't take it personally﹣﹣it can only help you give better advice next time.
（1）What does the underlined word "this" in Paragraph probably mean？
| A． |
Seeing the picture. |
| B． |
Giving feedback. |
| C． |
Receiving feedback. |
| D． |
Showing a way to success. |
（2）Why is it important to give feedback in time according to Paragraph 2？
| A． |
You might forget to tell the person later on. |
| B． |
Perhaps the person wants the feedback right away. |
| C． |
Maybe the person needs time to understand your advice. |
| D． |
If you wait to long，the person might forget what's happened. |
（3）What can we infer（推断）from the underlined saying in Paragraph 3？
| A． |
It's helpful to keep on giving bad feedback. |
| B． |
It's difficult to do a good job all the time. |
| C． |
It's better to balance good and bad feedback. |
| D． |
It's important to think twice before giving feedback. |
（4）The passage is mainly about .
| A． |
what characters good feedback includes |
| B． |
how people should give feedback properly |
| C． |
the differences between good and bad feedback |
| D． |
the importance of giving and receiving feedback |
（1）One of my friends sometimes takes aside another friend to talk to her about something she doesn't want me to hear． It makes me feel sad． What should I do？
（2）Some of my friends are in a fight． like them all equally（同样地）， but they say I have to choose sides． Help!
（3）I look up to my sisters． They're both intelligent（聪明的） feel that I'll never be as good as them．
（4）I am the shortest person in my class， and my classmates call me "Tiny Mouse． " How can I make them stop？
（5）I always use the computer and can't stop I feel that I'm not getting any smarter and the computer is warping（扭曲） my brain．
A． It's wonderful that you admire them． but try not to compare yourself to them． Instead of trying to be like them， just try to be the best you possible． You will find that you will be much happier when you try to be true to yourself， rather than when you try to be like someone else．
B． The only way to break a habit is to force yourself to do something different． A world of exciting and interesting activities is just waiting for you． Write a list of things you've always wanted to do， learn， make， or try． When you feel like playing it， do something else．
C． Discuss this with her． Try not to suppose that she talks about you unless you actually hear what she says． But let her know that you are unhappy when she tells secrets around you． If you feel uncomfortable talking to her in person， you could write her a note instead．
D． We often hear from kids who are laughed at about their height． They probably don't mean to hurt your feelings． There are advantages and disadvantages to being any size． You might play along and come up with a funny reply． However， if you feel hurt， try talking to a parent or teacher．
E． Explain to your friends that you like all of them． You can play with each person or group separately． If they don't like this， then you may want to focus on other friendships until these friends work things out． Another idea is to offer to help your friends solve their problems．
阅读下面短文，并根据短文后的要求答题．
Messaging app WeChat is being used for an ever longer period of time and is growing into a lifestyle choice embedded into daily activities and communication， a new survey has found．
In 2016， one﹣third of WeChat's 889million monthly active users spent four hours or more per day on the app， twice that of a year ago， according to the survey showed by Penguin Intelligence， a research arm of Tencent Holdings．
The average（平均）daily time spent is also up a bit，now at 66 minutes，surpassing that of Facebook's average 50 minutes recorded last year．
And it's becoming more popular than ever， spreading into new aspects of life from offline payments to receiving newsfeeds．
The survey also found a larger number of newly﹣added connects（联系） of WeChat users are casual acquaintances（泛好友）， especially in work﹣related communication． Such a developing situation is turning the app into a virtual（虚拟的） workplace． Over 80% of users have handled（接触过） office work on WeChat， from transferring documents and coordinating（协调） tasks to taking video calls and doing business．
"The all﹣in﹣one super app is completely changing the way we live． When lining up for coffee， I can't see a single customer holding a wallet， ， they hold mobile phones over a reader and coffee are theirs，" said Fred Wellington， an Australian auditor working in Shanghai．
1）How many WeChat's monthly active users spent four hours or more per day on the app in 2015？（根据短文内容回答问题）
2）Please translate the underlined sentence in Paragraph 3 into Chinese． （请把第3段中划线句子译成汉语）
3）Why is the app WeChat being turned into a virtual workplace？ Give two examples． （根据短文内容回答问题，并从文中举出两个例子）
4）Fill in the blank in the last paragraph with one word． （根据对文章的理解，在空白处填入一个恰当的词）
5）Please give a suitable title for the passage． （请给文章拟一个标题）
Do you often listen to music at loud volumes？ You should know that this habit is bad for your hearing． Over 1 billion young people are at risk of hearing loss（听力丧失）， because of listening to loud noise for long periods of time． Listening to music or watching a TV show at loud volumes can harm your hearing．
The United Nations has standards for safe listening． It is not safe to listen to sounds that are louder than 85 dB （分贝） for eight hours or 100 dB for 15 minutes．The sound of a busy road is about 85 dB and the sound of a rock concert can be about 100 dB．
Loud noise is harmful to the inner ear． Most of us are born with about 16，000 hair cells（听毛细胞） in our inner ears． These cells notice sounds． However， listening to loud noise for a long time can make these cells work too hard and cause some of them to die． This is what causes hearing loss Once this happens， it's hard to get your hearing back．
Some people might think that their music isn't all that loud． But this can depend on where you are． For example， if you are in a noisy place like the subway， you might turn up your music too loud without realizing it． Later， when you listen to it at the same volume in a quiet place， you might feel uncomfortable．
The "safe level" for most sound is below 80 dB for up to 40 hours a week． a level of 80 dB is about equal to（相当于） the noise of a subway．
Here is some advice on safe listening． Over﹣the﹣ ear headphones（头戴式耳机） are better than in﹣ear ones． They do a better job of stopping outside noise， so you can listen at a lower volume．Don't listen to loud music on your headphones for a long time． Follow the 60： 60 rule： listen to music at 60 percent of your headphones' maximum volume for no more than 60 minutes a day．
根据短文内容，判断下列句子正误．正确的用"A表示，不正确的用"B"表示．
（1）It is safe to listen to sounds that are louder than 100 dB for 15 minutes．
（2）Listening to loud noise for a long time can cause some hair cells in the inner ear to die．
（3）From the fourth paragraph， we know people don't always realize how loud their music is．
（4）In﹣ear headphones are better than over﹣the﹣ear ones because they can stop more outside noise．
（5）This article mainly tells us why ears are an important part of our bodies．
Today，by carefully choosing dog parents，humans have created many different kinds of dog Each kind has its own look and talents and its own role within human society.Here are three examples of "a dog's life" in the human world.
Today，many hospitals let specially trained dogs in to bring love and cheer to patients.Shaynee is a therapy（治疗）dog.She visits children who are in hospital.Dogs like Shaynee help patients feel calm and at peace which can be hard in a busy hospital.They help both children and adults stay strong during long hospital stays，and，some suggest，even help them get better.
Today some beagles（小猎犬）work in airports for the government They are part of the program called he Beagle Brigade.A beagle is good or the work because of its powerful nose，and ability to follow smells.The Beagle Brigade's job is to smell everything that comes into the country.They make officers notice illegal（非法的）fruits.vegetables，and other foods in luggage or in mail.The beagles do the job far better than any human could.
While some dogs are working hard others are free to spend their days resting and playing Across the world，many pet dogs are treated like children.Many have their own rooms and all the things a dog could want Some even have their own clothes.Many of these pets spend their days playing，learning to follow or even going to classes.Their owners give them the best，and enjoy doing so.
Whether as workers or objects of affection（钟情）dogs have become helpful to humans in many ways.There are plenty of advantages for the dog，too.Many kinds of wild dogs have nearly disappeared from the Earth.However，the domestic dog's special place as "man's best friend" has allowed it to survive （存活）in a human world.
（1）What is the main idea of Paragraph 2？
| A． |
Hospitals need many special dogs. |
| B． |
Dogs can take care of patients. |
| C． |
Patients need love in the hospital. |
| D． |
Doctors are too busy to see patients. |
（2）What does the underlined word " domestic" in Paragraph 5 mean？
| A． |
Trained. |
| B． |
Smart. |
| C． |
Hungry. |
| D． |
Valuable. |
（3）What's the purpose of the passage？
| A． |
To ask people to treat dogs as their own children. |
| B． |
To explain why humans need beagles in their work. |
| C． |
To tell people about the history of dogs' development. |
| D． |
To show a good relationship between dogs and humans. |
（4）Which of the following best shows the structure of the passage？
Obey the rules of British roads
British roads， some of the safest in the world． A study in 2018 compared more than 30 countries and found that 3.8 people per 100，000 died in traffic accidents in the UK． This number was lower than any other country． So， what did British drivers do to achieve this？ What are they doing differently？ Here are five top tips for drivers who are planning a trip to the UK．
People in Britain drive on the left side of the road． In fact， a long time ago people drove on the left in most countries， but now only a few countries have this． Don't forget that this also means you must drive the other way around roundabouts （ 环岛）．
British people feel that waiting should be fair for everybody． If you are in a queue of traffic，then don't try to push past the cars in front of yours． This is called "jumping the queue"． You must wait for your turn； otherwise people may get angry with you．
You must stop at the traffic lights when they are red． In many countries． it is OK to go past the red lights if you are turning a corner or if there isn't any other traffic around． In the UK you could have a lot of trouble if you do this．
If another driver flashes （闪烁） his cars lights at you， he is probably trying to tell you that he will wait for you to go first． British people don't like to use their car horn （ 喇叭） much and they think people who do so are rude．
If you get in an accident，don't try to pay the police．The police in the UK never take money，and if you try to offer them some， you could end your holiday visiting British prison．
回答下面5个问题，每题答案不超过六个词．
（1）How many tips are mentioned in the passage？
（2）Which side do British people drive on？
（3）If you jump the queue， how will other drivers feel？
（4）What does the driver probably mean if he flashes his car's lights at you？
（5）If you give the police money， what will happen to you？
Athletics vs． Gardening
The students of Southside School were asked to give their opinions about whether the school should run an athletic program or start a vegetable garden．
An athletic program is hatch better than gardening． How are we ever going to win anything at the Inter﹣School Athletics without proper training？ At the moment， we only do athletics for one tam and the teachers train us． We need experts（专家）to teach us things like throwing and high jump． I know lots of kids say they're tot interested in competitions， but that's because they've never won anything． If they got better training and started winning things， they'd soon change their minds． People always say kids don't get enough exercise． Just because you do gardening outdoors doesn't make it exercise， so I don't sec how it matters． Athletics is much better for fitness and lots of kids can have a go at the same tine． I don't think there would be enough jobs for everyone in a garden． In fact， I think a garden is a really bad idea． I don't know why we're even considering it． Liz， Grade 8 |
I think a vegetable garden is a great idea． We already do hours of sport， including athletics． And not everyone likes sport． Gardening is a great way to get exercise without worrying about whether you're any good at it， or whether you're going to win． And you really do gel exercise when you garden． There's digging， weeding and watering Even picking things can be hard work ﹣ pumpkins aren't light you know! There are lots of kids around here who don't have gardens so they can't grow things even they want to． If you really want to do more sport， you can join a club． And think about it： What helps you to be good at sport？ You need to eat lots of fruit and vegetables． If we learn to cook all the things we grow， the garden will keep us all fit and healthy and then we'll be better at sport． Sam， Grade 8 |
（1）Which of these points do Liz and Sam both make？
A． Kids should take exercise．
B． Kids should eat vegetables．
C． Kids should try to win more．
D． Kids should be outside more．
（2）What is one reason Liz gives for saying "a garden is a really bad idea"？
A． Some students don't like getting dirty．
B． Some students don't enjoy being outside．
C． Some students already know how to garden．
D． Some students may have no chance to garden．
（3）Why does Sam say， "And think about it．： what helps you to be good at sport？"
A． To change the subject．
B． To introduce his next reason．
C． To support Liz's idea．
D． To find an answer to the question．
Sleepwalking（梦游） is when your child gets out of bed and walks around as if he 's awake，but he's actually asleep.Sleepwalking doesn't hurt your child，and it usually disappears when the kid grows up.
Sleepwalking happens during deep sleep.Your child might get out of bed and walk around as if he's awake，but he won't respondnormally to you or anything around him.This may make you upset.But try not to worry﹣your child is OK.
In fact，sleepwalking is quite common.7% to 15% of children sleepwalk，and it doesn't usually mean that there's anything wrong with them.Children aged 4 to 12 are more likely to sleepwalk.Both boys and girls sleepwalk.
Sleepwalking often happens in the first few hours of the night.When it happens，your child 's mind is asleep.However，his body is awake at the same time.
Sleepwalking usually has something to do with age and development.However，some things can increase your child's sleepwalking.For example：
●Bad habits that cause poor sleep
●Fever or some other illnesses
●A family history of sleepwalking
●Medical conditions that cause poor sleep
If your child is sleepwalking at least once every night，it's best to see a doctor.Also see a doctor if your child's sleepwalking is influencing the sleep of other family members，or if you're worried your child might hurt himself while sleepwalking.
（1）The underlined word"respond" means in Paragraph 2.
| A． |
反对 |
| B． |
反应 |
| C． |
喜欢 |
| D． |
体贴 |
（2）Most kids who sleepwalk usually appear during .
| A． |
primary school |
| B． |
junior school |
| C． |
senior school |
| D． |
middle school |
（3）When sleepwalking happens， at the same time .
| A． |
a kid's mind and his body are awake |
| B． |
a kid's mind is asleep and his body falls asleep，too |
| C． |
a kid's mind is awake but his body falls asleep |
| D． |
a kid's mind is asleep but his body is awake |
（4）Which of the following is not true according to this article？
| A． |
The kids whose parents sleepwalked may sleepwalk. |
| B． |
The kids whose habits cause poor sleep may sleepwalk. |
| C． |
The kids who often read before going to bed may sleepwalk. |
| D． |
The kids who sleep badly after they take medicine may sleepwalk. |
（5）From this article，we know .
| A． |
sleepwalking is very dangerous |
| B． |
boys are more likely to sleepwalk |
| C． |
85% to 93% of kids don't sleepwalk |
| D． |
sleepwalking happens in the morning |
Q： At recess（课间休息）， I don't know what to do because all my friends are playing games I don' like or don't want to play． So I end up standing by myself at recess doing nothing． What should I do？
Alex rider，13， Bloomfield，N．J．
A： In fact， recess was my least favorite part of the school day for Grades 1 to 5． I was never really into playing kickball． So， like you， I spent many days at recess standing alone． Take advantage of the extra time you have．I learned that reading a book is the best way to pass time， especially if it is sunny． Books are good for a lonely recess，because they take you out of your world and into another． If reading isn't your thing， then try making new friends． Some other things I would do at recess were chess and paper cutting． Those might be worth trying． Maybe the teacher who is watching over all the kids needs someone to talk to as well． Whatever you want to do， don't let your time go to waste．Johnny Hayes， 15 |
A： Do you believe in time travel， Alex？Because you just dragged me 40 years into the past． When I was 13， half my friends threw themselves into kickball at recess﹣ which was too vigorous（剧烈的） for me right after lunch． So， like you， I stood around a lot． Then， one day， my teacher， Susie， asked me．"What do you want to do？ I had no answer for her． But suddenly， it came to me： marbles! I asked a few friends， and they were happy to join me． Now， I'm not suggesting you play marbles， only that you consider what you feel like doing and can make you happy． And one last idea： There's no harm in trying games your friends are playing that you think you won't like． You might just surprise yourself． Philip Galanes， adult |
（1）Who is asking for advice？
A．Alex Rider．
B．Johnny Hayes．
C．Susie．
D．Philip Galanes．
（2）One of Philips suggestions is to ．
A．read a book
B．talk to a teacher
C．do what you feel like doing
D．stand without doing anything
（3）Why do Johnny and Philip mention the kickball game at their schools？
A．To show they shared similar experiences．
B．To show they were good at the kickball game．
C．To encourage Alex to make use of the new game．
D．To encourage Alex to surprise himself with a new game．
（4）Which part of a newspaper may this passage be taken from？
A．Science Study．
B．Art Style．
C．Sports World．
D．Teenage Problem．
You think it's " cool " to carry your backpacks and head out to school．But if you don' t know exactly how to choose，load，lift and wear them﹣these all﹣important accessories（配件）can be a pain in the back．Not to mention the neck，head and shoulders．
Backpacks can influence your health．Carrying a heavy load improperly can lead to
poor body position；and even hurt the spinal column（脊柱）．This can cause muscle strain，headaches，back，neck and arm pain．
For example，if it is carried on one shoulder，a heavy backpack forces the muscles and spine to balance the unequal weight．This may increase the possible back problems later in life．
More than 50 percent of young people suffer back pain by their teenage years．Research shows that this could be mainly caused by improper use of backpacks．
Here's some advice to help you carry backpacks comfortably and safely．
Choose the right backpack．Forget leather（皮革）! It looks great，but it's far too heavy．Go for canvas（帆布）．Pick a pack that has two wide，adjustable，comfortable shoulder straps（带子），along with a hip or waist strap，and plenty of pockets．Make sure the pack fits properly and its size is suitable for the wearers body．
Packing it properly．Only put in the pack what is needed for that day．It's a good idea to know what each object weighs．The total weight of the filled pack should be no more than 10 to 15 percent of the wearer's own body weight．Pack heaviest objects close to the body，and place little ones outside， away from the back．
Putting the backpack on．Put the pack on a smooth surface，at waist height．Put on the pack，one shoulder at a time，then adjust（调整）the straps to fit comfortably．Remember when lifting a backpack， or anything，to lift using the arms and legs and to bend at the knee．
The right way to wear a backpack，Both shoulder straps should be used，and adjusted so that the pack fits the body，without hanging to one side．Backpacks should never be worn over just one shoulder．You should be able to move your hands between the backpack and your back．The waist strap should also be worn．
Take the above advice，and you may not complain back pain，numbness or weakness in your arms and legs any more．
（1）What could mainly cause some young people to suffer back pain by their teenage years？ ．
A．Too much homework．
B．Poor treatment for backs．
C．Improper use of backpacks．
D．Unhealthy sleep position．
（2）Which of the following does the writer suggest？ ．
①Choose leather backpacks because it looks"cool" to go to school．
②Pick a pack that its size is suitable for the wearer's body．
③Make sure the backpack contains only what is needed for that day．
④Pack heaviest objects close to the body，and place little ones outside．
⑤Put the pack on a smooth surface，above the waist height．
A．①②④
B．①③⑤
C．②③④
D．②③⑤
（3）If a boy weighs 40kg，how heavy should his filled backpack be at most？ ．
A．About 4kg．
B．About 6kg．
C．About 10kg．
D．About 15kg．
（4）What is the passage mainly about？ ．
A．Some problems that teenagers face in their study at school．
B．The suitable backpack material that you should choose．
C．The good influence that backpacks have on your health．
D．Some advice on how to carry backpacks comfortably and safely．
At an early time，a paper ticket was necessary even for passengers who bought tickets online.But now people are saying goodbye to paper tickets.
Passengers can swipe（刷）an ID card to pass through a gate before taking a high﹣speed train. "It's very convenient and fast， "said Wu Yuanzhen，a passenger from Guangxi. "I am a business man and travel a lot by train.For us，time is money.E﹣tickets save time and improve travel efficiency（效率）. "
For passengers who need to change or return their tickets，they can change the tickets or get their fund（退款） through 12306.cn or the ticket office at the station.
Since 2011，passengers have been able to swipe their ID cards at self﹣service machines to take the Beijing﹣Tianjin high﹣speed railway and Beijing﹣Shanghai high﹣speed railway.And now checking﹣in by swiping an ID card is available at high﹣speed railway stations in most cities across China.At stations in some remote（偏远）areas，passengers still need a paper ticket to get on a train.
（1）Were paper tickets necessary when people travelled by train 15 years ago？
（2）What is the advantage of c﹣tickets？
（3）How can you change or return your e﹣tickets？
（4）Is checking﹣in by swiping an ID card available in your hometown？
（5）According to the passage，where do people sill have to use a paper train ticket in China？
Drones（无人机）are like planes， but come in many shapes and sizes． They have no pilots and controlled from outside the drones． During these years， they have been used to attack（进攻）enemies or move goods in dangerous areas．
Now small drones are a part of people's lives． For example， people use drones to take photos or make videos． Besides， a drone delivery （投递） service has proved successful．
Online store JD can use drones to deliver small packages（包裹）． It has built several drone stations so that it can load （ 装载） and deliver its packages．
Drones have made our shopping experience different． We can order a new coat in early morning and it will be delivered before we finish breakfast．
Bizzby Sky， a UK company， has created a delivery service for small goods． Open a smartphone app（应用软件） ，enter your address， set a time and pay enough money for the delivery service． Then in minutes， a drone will do tasks for you．
However， any drone company needs government permission （允许） to fly its drones in many countries． We believe we will see more and more drones with goods fly in the sky very soon．
根据上面短文内容填空：
（1）Drones are like Planes， but come in many ． They have been used in some fields such as attacking enemies or in dangerous areas．
（2）Drones can to take photos or make videos by people． Besides． a drone delivery service has
proved to be another ．
（3）Several have been built by JD to have its packages loaded and ．
（4）If you open a smartphone app， enter ， set a time and enough money on the delivery service， a drone will do tasks for you．
（5）Today's shopping experience isn't the old one because of drones． However， no drone company can fly its drones getting government permission in many countries．
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