In 1988，Wang Chengbang retired（退休）from the army.Instead of enjoying a relaxing life，he volunteered to save the soil from desertification（沙漠化）by planting trees in Korla，Xinjiang.
It is no easy job.The high temperature in Korla makes it difficult for anyone to work day after day in the sunshine.Besides，water is a big problem.In fact，Wang Chengbang's work in the first few years failed as very few trees survived（存活）.
But Wang Chengbang would not give up."After trying many different ways，I have learned how to grow young trees in a better way，" said Wang Chengbang.He also worked out new ways to save water.With his hard work，more and more trees have survived.So far，he has planted more than 1.5 million trees.Those green trees prevent desertification，make the air cleaner and protect people from the hot sun.Now，Korla is a model city in environmental protection.
Wang Chengbang is also successful in fighting cancer（癌症）.In 2005，he had cancer and was told that he had only six months to live.However，he continued taking care of his trees rather than lying on the hospital bed."Working is the best medicine.Planting trees helps to fight cancer，" he often jokes.
Now，at the age of 85，Wang Chengbang is still working.
（1）Is it an easy job for Wang Chengbang to plant trees？
（2）How many trees has Wang Chengbang planted so far？
（3）What is Wang Chengbang successful in？
（4）In the summer holiday，do you want to be a volunteer to work with Wang Chengbang？Why or why not？
The Youth Climate Summit（气候峰会） a week﹣long festival of climate action for primary and middle schools in the UK，starts on 9 November.It aims to create a fairer，more environmental world and make promises that will help the planet.Climate change is the long﹣term changes in the world's weather patterns that are mostly caused by human activity. "Unlike world leaders， "say the summit's organizers. "young people are refusing to let it drop off the plan. "
Each day has a topic，which includes food and fashion，looking at how humans harm the environment and how to save the planet.Organizations are leading some on line activities.For example，the Marine Conservation Society is hosting meetings on protecting sea fish.Separately，the environmental organization Greenpeace is running a workshop on how to turn worn﹣out clothing into something new and wearable.
The summit will finish on 13 November，when youth ambassadors（大使）wants schools to stop paper waste.Max，another 16﹣year﹣old ambassador wants schools to organize more trips and activities that get students outside to experience the beauty of nature.As part of the summit，hundreds of schools across the country are signing up to the Let's Go Zero activity，aiming to become carbon﹣zero（零碳的）by 2030.
Carbon﹣zero schools are ones that promise to stop emitting carbon in seven areas，including where they get their food and how they use water and recycle their waste.The activity is run by Ashden，a charity working towards climate solutions.Ashden hopes that schools will be able to help each other by sharing ideas and methods.It is also calling on the Government to back the promise.Head over to transform﹣our﹣world.org where you can find out more.
（1）The writer develops the first sentence in Paragraph 2 mainly by .
| A． |
telling stories |
| B． |
comparing facts |
| C． |
giving examples |
| D． |
listing numbers |
（2）Max advises schools to .
| A． |
recycle and reuse old clothes |
| B． |
prevent students from wasting paper |
| C． |
have meetings on saving endangered sea fish |
| D． |
provide more chances for students to enjoy the nature |
（3）The underlined word " emitting" in Paragraph 4 is the closest in meaning to" ".
| A． |
using up |
| B． |
taking in |
| C． |
sending out |
| D． |
cutting down |
（4）The purpose of the passage is mainly to .
| A． |
explain the problems with climate change |
| B． |
develop children's ability to solve social problems |
| C． |
introduce the environmental organizations to schools |
| D． |
encourage young people to care more about climate change |
Do video games do harm to our children？Today，many children spend a lot of their free time playing games on the Internet.In the UK，99%of kids aged8 to 15 play video games every week.This information tells us that the benefits and dangers of video games must be carefully considered.
For many people，video games are fun.They have bright lights，funny cartoons and exciting stories.Everywhere you look，you can see children playing these games.They play on buses and trains，in restaurants and even at school.
Video games are educational too.They make kids think in a creative way and theyhave to move their hands and eyes quickly.This can improve the way that a child's brain works.What's more，video games make children use their imagination.The player has to do many creative things，like drawing，telling stories and building things.Video games are also a good way to teach children about technology because they can learn how computers and other devices work while they play.
However，a recent study suggests that video games can also be bad for children.First，children can download many games for free.This means that parents often don't know if their children are playing violent or scary games.Second，many children spend too much time playing games on computers and this can lead to health problems.Third，if children spend too much time playing games instead of doing homework，they can have problems at school and get bad grades.Finally，video games can affect children's social skills.If children spend too much time playing video games by themselves，they might not learn how to play with their friends.
In conclusion，it seems clear that video games have some advantages and some disadvantages.It is up to parents to know what games their children are playing and how much time they spend on them.Parents should also make sure their children get enough exercise and spend time with other children.
（1）The underlined word "they" in Paragraph 3 refers to .
| A． |
kids |
| B． |
computers |
| C． |
video games |
| D． |
playmates |
（2）Which disadvantages of video games are mentioned in the passage？
a.Result in bad grades.
b.Make kids feel bored.
c.Lead to health problems.
d.Affect children's social skills.
e.Cause problems between parents and kids.
| A． |
c，d，e |
| B． |
b，d，e |
| C． |
a，c，d |
| D． |
a，b，c |
（3）In the writer's opinion， should play an important role in video games play for kids.
| A． |
family |
| B． |
society |
| C． |
schools |
| D． |
game companies |
（4）What's the structure of the passage？
| A． |
|
| B． |
|
| C． |
|
| D． |
|
Governments around the world are pushing for an end to plastic straws （吸管） and bags.More and more businesses are turning to paper products as a choice.Paper is considered by many to be better than plastic.However，it，too，is harmful to the environment.
Firstly，paper bags and straws are made from trees.Trees，as you know，can reduce （减少） carbon dioxide （二氧化碳） levels in the atmosphere. Theycan slow down climate （气候） change.An increase in the use of paper bags can cause more acts of cutting down trees.
Secondly，products made from paper require more energy and water.About 10 percent more energy and four times as much water is used to produce a paper bag than a plastic one.You might say that we can use recycled paper to save that energy and water.This seems to be a good idea.However，it takes even more energy and water to go through the recycling process than to make a brand new paper bag.Products made from recycled paper are also often short﹣lived.
Thirdly，paper products are heavier than plastic ones.That means they require more oil to transport.Seven trucks are needed to transport two million paper bags，while only one truck is needed to transport the same number of plastic bags.The increased weight also leads to a large amount of waste once the bags are thrown away.
Paper products are actually a lose﹣lose for both the environment and businesses.They are more expensive than plastic products.A paper straw costs about 5 to 12 cents，while a plastic one usually costs only about 2 cents.
The most environment﹣friendly solution is to avoid single﹣use products altogether.Products like glass water bottles and steel straws can be used over and over again.They are much better than either paper products or plastic products.Through increasing the use of these products，you can greatly reduce your throwaway waste and truly make our Earth a greener place!
（1）What does the underlined word " They" in Paragraph 2 refer to？
| A． |
Plastic products. |
| B． |
Trees. |
| C． |
Paper products. |
| D． |
Businesses. |
（2）Compared with transporting two million plastic bags，transporting two million paper bags requires .
| A． |
fewer trucks |
| B． |
six more trucks |
| C． |
twice as many trucks |
| D． |
the same number of trucks |
（3）The writer compared the price of a paper straw and that of a plastic straw to show that .
| A． |
paper products are not a good choice for businesses |
| B． |
it is difficult for all businesses to turn to paper products |
| C． |
most people believe paper products are better than plastic ones |
| D． |
paper products are as harmful to the environment as plastic ones |
（4）By writing this article，the writer mainly wanted to .
①compare plastic products with paper ones
②correct people's wrong ideas about paper products
③suggest people use reusable products like steel straws
④list the advantages and disadvantages of using paper products
| A． |
①② |
| B． |
③④ |
| C． |
①④ |
| D． |
②③ |
If your pencil box is broken，the batteries（电池）in your flashlights run out，or you have some leftover food，how will you deal with these things？You will probably throw them all into one rubbish bin.But actually，we need to sort（分类）all the rubbish separately.If you don't sort your rubbish，all of it will go to a special place where it is buried（埋藏）together.As a result，it will take up some fields.Some rubbish will pollute the groundwater.Some rubbish that can be reused will be wasted.
In recent years，some Chinese cities have been working hard on rubbish sorting.
Shanghai has called on all the people living in this city to sort their rubbish into four groups：wet，recyclable，harmful and dry.Wet waste is known as household waste.They are things you don't want but pigs can eat.Paper，metal，glass，plastic and other things that can be reused are recyclable waste.Harmful waste includes thins like medicine，batteries.Finally，any waste that is not wet，recyclable or harmful will go to the "dry waste" bin.
Many other Chinese cities are also using this way to sort their rubbish.For example，Deyang has been sorting its rubbish into the same four groups since several years ago.Students in Deyang have already received waste﹣sorting guidebooks.They have studied these books and known how to sort the rubbish.
China is now improving its waste﹣sorting efforts.There is still a long way to go.But it's never too late to learn how to sort your rubbish rightly.We should take an active part in it.
（1）How many bad results will there be if all the rubbish is buried together？
A.Two.
B.Three.
C.Four.
D.Five.
（2）What does the underlined phrase "take up" in Paragraph 1 mean？
A.处理
B.改变
C.占用
D.从事
（3）Which of the following is harmful waste？
A.Metal.
B.Paper.
C.Medicine.
D.Glass.
（4）What can we learn from the passage？
A.Students in Deyang have known how to sort the rubbish.
B.Paper and metal can be thrown into a "dry waste" bin.
C.The whole world is working hard on rubbish sorting.
D.China has already succeeded in sorting the rubbish.
When you have a cold，your friends can't visit you because they don't want to get a cold.When you are part of a family，if one of you gets a cold，often all of you get it.
（1） .Below are four ways to help stop a cold spreading and to feel better again.
●Wash your hands.
Washing your hands is the most important way to stop the spread of colds.Cold germs （病菌） are spread by touch.The germs get onto your hands and from there into your eyes，nose and mouth.Wash your hands carefully using soap and hot water.（2） ，they will be much less likely to get the cold.
●Cover your nose and mouth.
There is a saying that "coughs and sneezes spread illness". （3） when coughing and your nose if sneezing.That way，the cold germs won't get onto your hands and spread to things you touch such as doorknobs，tap handles or cups and plates.
●（4） .
Cold germs are spread very easily.You can use a disinfectant （消毒的） cleaner to clean doorknobs，taps，toilet handles.Be sure to use only your own towel，toothbrush and cup.
●Take care of yourself.
（5） .Eat healthy simple foods such as soup or rice.Get enough rest and sleep.Stay in bed，read a book.Do your schoolwork and practice your English!
Remember that a common cold only lasts a few days.You will feel better soon.
A.Some cold medicines can help stop aches and fever
B.Cold germs can be spread by coughing and sneezing
C.If all the members of your family wash their hands too
D.Always use a piece of soft paper to cover your mouth
E.When you wash your hands every half an hour
F.Clean your house
G.There is no good method of treating the common cold
Here at Nature Loving Kids，we know how much you want to make a positive（积极的）difference to our world!So，read on to find out how to protect our earth…
| Save energy and water! - On a fine and clear day，hang things outside to dry!This saves energy that would have been used on the dryer（烘干机）. - If you can，try cycling，walking，or using public transport to get out and about，instead of using the car. - Turn the taps（水龙头）off while brushing your teeth，and take short showers of four minutes or less! |
Be an advocate（倡导者）! - Share your knowledge with others，and help them become eco﹣heroes too!It takes lots of people working together to make changes happen - so share，share，share! |
| Reduce，reuse，recycle! - Before you throw something away，stop and think about what else it could be used for! |
Be friendly to wildlife! - Make your garden wildlife﹣friendly!You could build a bee hotel，or even create a pool. - If you own a cat that goes outdoors，put a bell around its neck so that vulnerablewildlife can hear it coming and make their escape! |
What else can you do to make the world better？
Now，get out there and save the world - you can do it!
（1）To save energy or water，you'd better .
| A． |
dry things in the sun |
| B． |
drive a car to work |
| C． |
take long showers |
| D． |
brush teeth with water running |
（2）To call on more people to work together，you should .
| A． |
save energy and water |
| B． |
be an advocate |
| C． |
reduce，reuse and recycle |
| D． |
be friendly to wildlife |
（3）What does the underlined word " vulnerable" mean in Chinese？
| A． |
野生的. |
| B． |
家养的. |
| C． |
强壮的. |
| D． |
弱小的. |
（4）The purpose of the passage is to .
| A． |
help the kids learn English |
| B． |
help people learn more about kids |
| C． |
teach kids how to keep animals |
| D． |
tell the kids how to protect the earth |
（5）This passage is from .
| A． |
a guidebook |
| B． |
a science book |
| C． |
a website |
| D． |
a newspaper |
More children in China are putting on weight.In 2018，16 percent of Chinese children were overweight，according to the National Health Commission（NHC）.
Being too fat is bad for children' s health.According to the World Health Organization （WHO），overweight children are more likely to develop diseases like diabetes（糖尿病） at a younger age.This can lead to a higher chance of earlier death.
On Oct 23rd，the NHC，together with five other national departments，worked out a plan.The plan aims to reduce the growth of fatness among children aged 0﹣18 years by 70 percent from 2020 to 2030，Xinhua reported.
Kids are putting on weight because of changes in their diet and lifestyle，according to experts.Too much schoolwork and greater use of electronic devices（ 电子产品） could also be a cause.
According to the plan，teachers should not allow their classes to run too late or too early.They should make sure that students have breaks and enough physical（躯体上的） activity.School students should have at least three hours of active physical activity each week.
Parents should reduce their children's use of electronic devices and stop their children from eating foods that are high in sugar，fat and salt.
（1）According to the WHO，we know .
| A． |
16% of Chinese children were overweight in 2018 |
| B． |
Being too fat is good for children's health |
| C． |
Overweight children are more likely to develop diseases |
| D． |
Fatness can lead to a higher chance of long life |
（2）Which one is NOT experts' opinion？
| A． |
We should reduce the growth of fatness among adults. |
| B． |
Changing in children's diet and lifestyle leads to being too fat. |
| C． |
Too much schoolwork maybe leads to being too fat. |
| D． |
Greater use of electronic devices could cause children to put on weight. |
（3）School students should have active physical activity for .
| A． |
three hours a day |
| B． |
more than three hours every day |
| C． |
at least three hours each week |
| D． |
less than three hours each month |
（4）What's the main idea of the passage？
| A． |
Overweight isn't a problem. |
| B． |
Say no to children's getting too fat. |
| C． |
Putting on weight is necessary for the kids. |
| D． |
Teachers should not allow their classes to run too late. |
根据短文内容，从下列选项中选出能填入空白处的最佳选项。选项中有两项多余。
The COVID﹣19 epidemic（新冠疫情）is sill spreading rapidly throughout the world.Luckily，it is under control in China with the efforts of our government and all the people.However，we should still be careful in our daily life.There're some rules for us to follow.
① Get vaccinated （打疫苗）
Since there's still no special medicine to cure（治愈） COVID﹣19， （1） The government is providing available vaccine（疫苗）for everyone in our country.If you're over 18 years old and in good health，you can get vaccinated near your community. （2）
②Wear masks（口罩）
People have been used to wearing masks since the epidemic broke out.It is summer now，maybe wearing masks in hot weather makes you feel uncomfortable.However， （3）
So whenever you go out，don't forget to put on your mask.You may look cooler with a mask on!
③Wash your hands
（4） Especially when you get home from school or work，or return from any other public places，the first thing you should do is to turn on the tap（水龙头），pick up the soap and wash your hands completely.
④Keep safe social distance（距离）
You'd better not go to crowded places.The summer vacation is beginning.If you have to go to the stores，movies，parties，supermarkets，etc，besides wearing masks，remember to keep social distance. （5）
Anyway，take good care of yourself and live a safe and happy life!
| A.Wash your hands as often as possible. B.But you have to pay! C.we don't need to do anything about it. D.What's more，it is free! E.Avoid getting too close to other people. F.the vaccine is the most important way to prevent it. G.it is still a good way to stop the virus（病毒） from spreading among people. |
Li Tao，a Junior 1 student，was quite busy over the past winter vacation but not just with homework.Li，together with his 10 classmates made a volunteer group to call on people to join in The "Clean Your Plate Campaign" （光盘行动） .
The 11 students went to many restaurants and told people the importance of saving food. "Excuse me，do you know that 950 million people around the world still haven't got enough to eat？Please don't waste food." They would say that hundreds of times every day.
China in these years has serious problems with wasted food.CCTV reports that the food Chinese people waste every year is enough to feed 200 million people for a year.
Chinese people are well ﹣ known for being generous （慷慨的）.Many even feel that they lose face if their guests have eaten all the food.
To reduce food waste is a big task，and it needs time.It's important that everyone should do their bit，just like Li.Did you finish your meals today？
Judge the following statements True（T） or False（F）.
（1）Li Tao was only busy with his homework over the past winter vacation.
（2）The 11 students went to the same restaurant and said the same words many times.
（3）The problems with wasted food in China are serious.
（4）Many Chinese people feel proud if their guests have eaten all the food.
（5）Everyone should save food to reduce food waste.
Recycling is a way to take rubbish and turn in into new products.helpful to our environment There are a number of different recycling steps that allow materials to be used more than once.
All kinds of materials can be recycled.Some of the most common things in use today include recycling plastic glass，metals and paper Things made of these materials include soda cans，plastic milk boxes，newspapers，computers and cardboard boxes.
There are a number of advantages for recycling.These include：Landfills ﹣Recycling materials means less rubbish and saves space in landfills.Resources﹣ When we use materials again，this means we can take fewer resources from the earth Pollution in general，recycling materials can produce less pollution，helping to keep our environment clean.
Be sure to recycle everything you can in your house and school There is almost a "recycle" rubbish can around.Be sure to drop your used aluminum cans and plastic bottles there.At home，be sure to put paper things like the newspapers.paper bores.and homework pages into the recycle box.
Plastics are usually marked with an identification code that shows a recycling symbol and a number from 1 to 7.This shows that the type of chemicals，or materials，is used in making the plastic.Used paper can be recycled around seven times.
It is high time we set up a recycle station in every street，across the city and the country so the cleaners can transport the rubbish conveniently.This is the only way out for handling rubbish without causing danger to the environment and our health.For ourselves，our children and our children's children，let's take action NOW!
（1）From the first paragraph，we know that .
| A． |
A we can make more money from recycling |
| B． |
recycling is helpful to our environment |
| C． |
recycling is common and popular |
| D． |
there is too much rubbish around us |
（2）In paragraph 3，we know that recycling has many advantages including .
| A． |
less rubbish |
| B． |
more space |
| C． |
less pollution |
| D． |
all the above |
（3）What kinds of materials are usually marked with an identification code？
| A． |
Paper. |
| B． |
Plastics. |
| C． |
Glass. |
| D． |
Metals. |
（4）The underlined word "handling" in the last paragraph means in Chinese.
| A． |
处理 |
| B． |
生产 |
| C． |
收购 |
| D． |
变卖 |
（5）What does the writer mainly want to tell us？
| A． |
We should recycle everything in our daily life. |
| B． |
Many resources can be saved by recycling. |
| C． |
We should take action to recycle rubbish. |
| D． |
Recycle stations should be set up in the street. |
Pollution is one of the biggest problems in the world today.In many places，rubbish is thrown into lakes and rivers.（1）
In some cities，the air is filled with pollution.（2） If it is not cleaned up，more people will be hurt.
（3） Land and water pollution kills many animals every year.
If we do not act to improve the environment，more living things will be killed by pollution.
（4）
We should separate rubbish into different groups.In this way，it can be recycled and reused.We had better plant more trees.（5） What's more，we shouldn't put the waste into lakes or rivers.
If we can do these，we will make the world a better place to live in.
A.This makes some old people and children ill. B.As well as people，animals are also harmed by pollution. C.We can make our lakes and rivers cleaner and cleaner. D.It's time for all of us to take action right away! E.Because of this，these places have already been polluted. F.Trees reduce dust and help keep the air clean. G.A few of us should take action to protect the environment. |
What do you do with your rubbish？Throw it out？You don't know what you're missing!Look closely at the two figures on your left.They were made from things most people throw away.The figures were made from used bottle caps.Those two bottle﹣cap figures were exhibited （展示） in a museum.
Folk art is art made by common people who have not been trained as artists.Their work is often based on traditions in their culture.Fine art，on the other hand，is usually made by people who have had training in art.Works of fine art are valued for their artistic beauty.They are supposed to be looked at but not used.Works of folk art，however，are often made for everyday use.
There were more than 800 pieces of folk art from nearly 50 countries in the exhibition.All of the pieces were made from used metal，wood，cloth，and plastic.The artists come from many different cultures.Still，they all share one thing.They take objects that are normally thrown away and change them into objects that are beautiful，useful，and fun.The artists may not think of what they do as recycling，but that's exactly what it is.Fine artists might work with expensive materials.They might use expensive tools to shape these materials into works of art.On the other hand，in poor countries rubbish might be the only material folk artists and toy makers can afford.The exhibition shows that a rich imagination is very important when there are only poor materials.Recycled art began long before people began to think about recycling.Some of the objects in the exhibition date from the 1930s.
Even if you don't create art out of rubbish，it's good to save our natural resources.Remember the three rules：reduce，reuse，recycle.If you reduce waste，true things instead of throwing them out，and recycle materials such as paper，plastic，and glass，you will protect the environment.
（1）Which idea belongs in the empty box？
Conclusion （结论） |
Details |
Art based on cultural traditions |
|
Art made for everyday use |
|
Art made with used materials |
A.Folk art is made by people who are not trained artists.
B.The artists come from many different cultures.
C.Recycled art began long before people started recycling.
（2）What can we learn from Paragraph 3？
A.There was more than 800 pieces of fine art.
B.Folk artists can't shape expensive materials into works of art.
C.Poor materials also can be made into works of art.
（3）What is the same thing of the pieces in the exhibition share？
A.They are all woks of fine art.
B.They are all made from used materials.
C.They are all made by the trained artists.
（4）What can we do to protect our environment？
A.Throw away used materials.
B.Only use expensive materials.
C.Recycle materials.
（5）Which of the following would be the best title for the passage？
A.Used Bottle Caps
B.The Art of Recycling
C.A Museum Exhibition
What do you do with your rubbish？Throw it out？You don't know what you're missing!Look closely at the two figures on your left.They were made from things most people throw away.The figures were made from used bottle caps.Those two bottle﹣cap figures were exhibited （展示） in a museum.
Folk art is art made by common people who have not been trained as artists.Their work is often based on traditions in their culture.Fine art，on the other hand，is usually made by people who have had training in art.Works of fine art are valued for their artistic beauty.They are supposed to be looked at but not used.Works of folk art，however，are often made for everyday use.
There were more than 800 pieces of folk art from nearly 50 countries in the exhibition.All of the pieces were made from used metal，wood，cloth，and plastic.The artists come from many different cultures.Still，they all share one thing.They take objects that are normally thrown away and change them into objects that are beautiful，useful，and fun.The artists may not think of what they do as recycling，but that's exactly what it is.Fine artists might work with expensive materials.They might use expensive tools to shape these materials into works of art.On the other hand，in poor countries rubbish might be the only material folk artists and toy makers can afford.The exhibition shows that a rich imagination is very important when there are only poor materials.Recycled art began long before people began to think about recycling.Some of the objects in the exhibition date from the 1930s.
Even if you don't create art out of rubbish，it's good to save our natural resources.Remember the three rules：reduce，reuse，recycle.If you reduce waste，true things instead of throwing them out，and recycle materials such as paper，plastic，and glass，you will protect the environment.
（1）Which idea belongs in the empty box？
| Conclusion （结论） |
Details |
| |
Art based on cultural traditions |
| Art made for everyday use |
|
| Art made with used materials |
A.Folk art is made by people who are not trained artists.
B.The artists come from many different cultures.
C.Recycled art began long before people started recycling.
（2）What can we learn from Paragraph 3？
A.There was more than 800 pieces of fine art.
B.Folk artists can't shape expensive materials into works of art.
C.Poor materials also can be made into works of art.
（3）What is the same thing of the pieces in the exhibition share？
A.They are all woks of fine art.
B.They are all made from used materials.
C.They are all made by the trained artists.
（4）What can we do to protect our environment？
A.Throw away used materials.
B.Only use expensive materials.
C.Recycle materials.
（5）Which of the following would be the best title for the passage？
A.Used Bottle Caps
B.The Art of Recycling
C.A Museum Exhibition
Dogs might have the latest tools in the fight against cancer （癌症）：their noses!Researchers at California's Pine Street Foundation （PSF） say they have trained five dogs to smell cancer on a prison's breath.This could be exciting news.
A dog's sense of smell may be 10，000 to 100，000 times stronger than ours.But can dogs really smell illness？PSF researcher Michael McCulloch says yes. "We were very surprised by how exact they were，" he said. "They were telling who had cancer，and they were also saying who didn't."
McCulloch and his team asked four healthy people and one with cancer to blow into plastic tubes （塑料管）.Special materials in the tubes kept the things of each breath.The tubes were then placed one yard apart.Finally the dogs were allowed to smell the tubes.Each dog had been trained for three weeks to sit when it smelled cancer.Ninety﹣nine percent of the time，the dog sat next to the tubes blown into by patients with lung cancer.The dogs were right 88 percent of the time about breast cancer.
| Dogs in the Pine Street Foundation test were trained to sit when they smelled cancer.How well did they perform？Take a look at this chart to find out. |
||
| Breath Sample |
Number of Times the Dogs Sat Down |
Number of Times the Dogs Kept Standing |
| Breath from lung cancer patients |
564 |
10 |
| Breath from healthy persons |
4 |
720 |
No lab test for cancer has given more correct results than this test.The results are so amazing that many experts question the dogs' smelling power.They wonder if there were other reasons why the dogs did so well.For example，they thought the way the dog trainers behaved could have influenced how the dogs acted.However，most experts agree that this study is important.The information could help scientists create a simple breath test for cancer in the future.Once again humans may be getting a helping paw or nose﹣from their best animal friends.
（1）What's the latest tool a dog might have in the fight against cancer？
A.Tooth.
B.Nose.
C.Ear.
（2）What happened first in the Pine Street Foundation test？
A.The dogs were trained.
B.The tubes were placed one yard apart.
C.The dogs smelled the tubes.
（3）What was a dog supposed to do when it smelled cancer？
A.Smell again.
B.Turn around.
C.Sit down.
（4）Look at the chart.How many times did the dogs keep standing when they smelled the breath from healthy persons？
A.Less than 10 times.
B.Almost 600 times.
C.About 700 times.
（5）Why do many experts question the dog's smelling power？
A.Because no lab test for cancer has given more correct results.
B.Because the dog trainers influenced how the dogs acted.
C.Because they don't think this study is important.
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