LONDON—Here’s a new warning from health experts:Sitting is deadly.Scientists are

LONDON—Here’s a new warning from health experts:Sitting is deadly.Scientists are

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LONDON—Here’s a new warning from health experts:Sitting is deadly.
Scientists are increasingly warning that sitting for long periods—even if you also exercise regularly—could be bad for your health.And it doesn’t matter where the sitting takes place—at the office,at school,in the car or before a computer or TV—just the overall number of hours it occurs.Several studies suggest people who spend most of their days sitting are more likely to be fat,have a heart attack or even die.
In an editorial published this week in the British Journal of Sports Medicine,Elin Ekblom­Bak of the Swedish School of Sport and Health Sciences suggested that authorities rethink how they define physical activity to highlight the dangers of sitting.
While health officials have issued guidelines recommending minimum amounts of physical activity,they haven’t suggested people try to limit how much time they spend in a seated position.
“After four hours of sitting,the body starts to send harmful signals,”said Ekblom­Bak.She explained that genes regulating(调节) the amount of glucose(葡萄糖) and fat in the body start to shut down.
Even for people who exercise,spending long periods of time sitting at a desk is still harmful.Tim Armstrong,a physical activity expert at the World Health Organization,said people who exercise every day—but still spend a lot of time sitting—might get more benefit if that exercise was spread across the day,rather than in a single bout(一回).
Still,in a study published in 2009 that tracked more than 17,000 Canadians for about a dozen years,researchers found people who sat more had a higher death risk,whether or not they exercised.
“We don’t have enough evidence yet to say how much sitting is bad,” said Peter Katzmarzyk of the Pennington Biomedical Research Center in Baton Rouge,who led the Canadian study.“But it seems the more you can get up and interrupt this sedentary behavior,the better.”
Figures from a U.S. survey in 2003­2004 found Americans spend more than half their time sitting,from working at their desks to sitting in cars.
Experts said more research is needed to figure out just how much sitting is dangerous,and what might be possible to offset those effects.
“People should keep exercising because that has a lot of benefits,” Ekblom­Bak said.“But when they’re in the office,they should try to interrupt sitting as often as possible,” she said.
小题1:What is the best title for the text?
A.Not Sitting Too Much While Working
B.How to Avoid Sitting Too Much
C.Sitting Too Much Could Be Deadly
D.More and More People Sit Too Much
小题2:According to the research,________.
A.the more time you spend in exercising in a single bout(一回),the healthier you will be
B.those who often sit too much are sure to grow fat or suffer from a heart attack
C.regular exercise is effective to get rid of the side effects of sitting too much
D.you had better not sit for more than four hours in a single bout
小题3:How does the danger of sitting too much affect the human body?
A.It results in a higher death risk.
B.It increases glucose and fat in the body.
C.It makes a person unable to exercise long enough in a day.
D.It causes the gene to fail to balance the glucose and fat in the body.
小题4:The underlined word “offset” in Paragraph 10 most probably means “________”.
A.improveB.avoid
C.ignoreD.achieve

答案

小题1:C
小题2:D
小题3:D
小题4:B
解析

小题1: C
解析 标题归纳题。文章首先提出最新研究发现,即:久坐会致命。之后围绕该主题对研究进行介绍,并对此研究发现进行分析。故选C项。
小题2: D
解析 推理判断题。根据第五段第一句“‘After four hours of sitting,the body starts to send harmful signals’...”可推断选D项。
小题3: D
解析 细节理解题。根据第五段第二句“She explained that genes regulating(调节) the amount of glucose(葡萄糖) and fat in the body start to shut down.”可知,坐了四个小时后,身体会开始发出有害信号,此时调节体内葡萄糖和脂肪量的基因会停止工作,从而导致体内葡萄糖和脂肪量失衡。
小题4: B
解析 词义猜测题。最后一段中艾克布洛姆­巴克的话是对“what might be possible tooffset those effects”进行具体说明,即告诉人们如何避免久坐的不利影响,故选B项。
举一反三
You will go to college some day and college is one of the most exciting stages of one’s life.If you wish to make the most of your campus(校园) experience and become a better person after those four years,then first you ought to make friends.Close friends contribute to your self­growth for they provide you with moral support that is so important to survive the stressful college life.Friends can lend a helping hand when necessary like collecting your homework when you’re too sick to leave your dorm,and help you develop the right attitude by pointing out to you your weaknesses.
Being home most of your life and then suddenly finding yourself on your own in a large campus without your parents to hold your hand can be annoying.However,rather than thinking about your missing home too much,why not see this new stage in your life as an opportunity for self­growth and develop the right attitude that will prepare you for the rigors of post­graduation life,particularly when you join the workforce?
Special­interest clubs or organizations are great for self­growth.Here,not only do you get the opportunity to meet with like­minded people,you can also discover more things about your field of interest.Club meetings usually include lively discussions,so go there with the right attitude.You should try to build a good name in the organization by being respectful,active and considerate to others.
You might not like all of your professors,but they are there to provide knowledge you need to be successful in your chosen field.Thus,show up for each class with the right attitude and determination to learn.Whether you get along well with your professors or not has a huge effect on your self­growth as it is a measure of how well you can respect authority and obey requirements.
Actively participating in a class debate(辩论) or lecture contributes to your self­growth as it helps you build confidence in speaking up and improves your communication skills.It also helps you develop the right attitude by exercising diplomacy(外交术) when you choose your words carefully especially when discussing a very politically sensitive issue and exercising patience when dealing with classmates who shoot down your ideas.
小题1:In the writer’s opinion,how can college students develop a positive attitude?
A.By joining special­interest clubs.
B.By focusing on their studies.
C.By taking up part­time jobs.
D.By making friends with others.
小题2:According to the text,college students should do many things EXCEPT ________.
A.forget the family
B.be respectful at club meetings
C.try to attend each class
D.take an active part in a class debate
小题3:We can learn from the text that ________.
A.college life is very interesting
B.friendship can help college students avoid stress
C.students should choose words carefully at any occasion
D.it is important to have a good teacher­student relationship
小题4:The purpose of the text is to ________.
A.introduce how to show yourself in college
B.tell college students how to socialize with others
C.give college students some advice on self­growth
D.explain the importance of four­year college life

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Internet dating has become one of the biggest and most successful business ventures on the Internet.Basically,Internet dating is a way to meet people for either friendship or dating without actually having to meet them in person first.
The first thing to do if you decide to try Internet dating is to build your profile (简介) which can include your hobbies,hopes for the future,and so on.A photograph is optional,but many sites claim that a photograph increases the number of people who look at your profile.Many Internet dating sites will charge a one­time registration fee to use their services.
Internet dating makes it possible to meet people from all over the world.Your call even narrow the search down to your area by zip code (邮政编码).Another advantage is that you can communicate by e­mail before you meet in person.Thousands of people have met,fallen in love,and married through Internet dating.It is an excellent way for shy people to meet.It is also a way for people with busy lives to connect with others,and an easy way to meet people who share your interests.
Just as in conventional dating and love,there are some pitfalls to be aware of in Internet dating.The person you have been talking to on the Net may not be who they say they are.Be very aware that there are some people who misrepresent their appearance or private details,such as marital status,income,and so on,for their own reasons.It would not be the first time that someone has been taken in,and talk shows are full of cheating partners who have been caught dating over the Internet in their spare time.Nevertheless,taking a few simple precautions (防范措施) should help ensure that your Internet dating experience is fun.
小题1:The purpose of writing the passage is to________.
A.persuade readers to go dating on the Internet
B.inform us how to date on the Internet
C.warn readers against web love
D.introduce Internet dating to us
小题2:Which of the following is a must to make an Internet dating possible?
A.A photo.B.A profile.
C.Registration fee.D.Business experience.
小题3:The underlined word “pitfalls” in Paragraph 4 most probably means________.
A.rulesB.trends
C.problemsD.skills
小题4:What is probably talked about following the last paragraph?
A.Conventional dating.B.Hidden advantages.
C.Safety measures.D.Romantic love.

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If you want to learn a new language,the very first thing to think about is why.Do you need it for a____reason,such as your job or your studies?__2__perhaps you’re interested in the____,films or music of a different country and you know how much it will help to have a____of the language.
Most people learn best using a variety of____,but traditional classes are an ideal(理想的)start for many people.They____an environment where you can practice under the ____ of someone who’s good at the language.We all lead ____ lives and learning a language takes____.You will have more success if you study regularly,so try to develop a____.It doesn’t matter if you haven’t got long.Becoming fluent in a language will take years,but learning to get by takes____.
Many people start learning a language and soon give up.“I’m too____,” they say.Yes,children do learn languages more ___ than adults,but research has shown that you can learn a language at any____.And learning is good for the health of your brain,too.I’ve also heard people____ about the mistakes they make when____.Well,relax and laugh about your mistakes ____you’re much less likely to make them again.
Learning a new language is never ___.But with some work and devotion,you’ll make progress.And you’ll be ____by the positive reaction of some people when you say just a few words in ___ own language.Good luck!                                 (2013·安徽)
小题1:
A.technicalB.political
C.practicalD.physical
小题2:
A.AfterB.So
C.ThoughD.Or
小题3:
A.literatureB.transport
C.agricultureD.medicine
小题4:
A.viewB.knowledge
C.formD.database
小题5:
A.paintingsB.regulations
C.methodsD.computers
小题6:
A.protectB.change
C.respectD.provide
小题7:
A.controlB.command
C.guidanceD.pressure
小题8:
A.busyB.happy
C.simpleD.normal
小题9:
A.courageB.time
C.energyD.place
小题10:.
A.theoryB.business
C.routineD.project
小题11:
A.some risksB.a lot less
C.some notesD.a lot more
小题12:
A.oldB.nervous
C.weakD.tired
小题13:
A.closelyB.quickly
C.privatelyD.quietly
小题14:
A.ageB.speed
C.distanceD.school
小题15:.
A.worryB.hesitate
C.thinkD.quarrel
小题16:
A.singingB.working
C.bargainingD.learning
小题17:
A.ifB.and
C.butD.before
小题18:
A.tiresomeB.hard
C.interestingD.easy
小题19:
A.blamedB.amazed
C.interruptedD.informed
小题20:
A.theirB.his
C.ourD.your

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Global warming is when the earth heats up,the temperature rises.It happens when greenhouse gases—carbon dioxide,water vapor,nitrous oxide(二氧化氮),and methane(沼气) trap heat and light from the sun in the earth’s atmosphere,which increases the temperature.This is like when heat is trapped in a car.On a very hot day,the car gets hotter when it is out in the parking lot.This is because the heat and light from the sun can get into the car,by going through the windows,but it can’t get back out.Once the light is inside the car,it is trapped and the heat builds up,just like it does in the earth’s atmosphere.This is what the greenhouse effect does to the earth.The heat and light can get through the atmosphere,but it can’t get out.As a result,the temperature rises.
Sometimes the temperature can change in a way that helps us.The greenhouse effect makes the earth appropriate for people to live on.Without it,the earth would be freezing,or on the other hand it would be burning hot.We would not get the sun’s heat and light to make the night somewhat warm.During the day,especially during the summer,it would be burning because the sun would be up with no atmosphere to filter(过滤) it,so people,plants,and animals would be exposed to all the light and heat.
Although the greenhouse effect makes the earth able to have people living on it,if there gets to be too many gases,the earth can get unusually warmer,and many plants,animals,and people will die.They would die because there would be less food (plants like corn,wheat,and other vegetables and fruits).This would happen because the plants would not be able to take in the heat.This would cause us to have less food to eat,but it would also limit the food that animals have.Gradually,people,plants,and animals would all die of hunger.
People are doing many things to try to stop global warming.One thing people are doing is carpooling.Carpooling is driving with someone to a place that you are both going to.This minimizes the amount of greenhouse gases put into the air by a car.
Another thing that people are doing is being more careful about leaving things turned on like the television,computer,and the lights.A lot of people are taking time away from the television,and instead,they are spending more time outdoors.This helps our planet out a lot.Now,more people are even riding buses,walking to school,and riding their bikes to lower the amount of greenhouse gases in the air.
Planting trees and recycling also help.If you recycle,less trash goes to the dump,and less trash gets burned.As a result,there are fewer greenhouse gases in our atmosphere.Although adults do many things to help stop global warming,kids can do just as much.
小题1:By the example given in Paragraph 1,the author wants to ________.
A.explain how greenhouse gases work
B.show his feeling in a car in hot summer
C.tell us cars are causes of greenhouse gases
D.say that there are greenhouse gases in every car
小题2:The underlined word “it” in Paragraph 2 refers to “________”.
A.lightB.heat
C.temperatureD.greenhouse effect
小题3:What is the main idea of Paragraph 3?
A.If there is greenhouse effect,all the plants will die.
B.Human beings are likely to disappear from the earth.
C.Crops can’t take the heat if there is greenhouse effect.
D.Although greenhouse effect is necessary,too much of it causes us to die.
小题4:What will the author most probably discuss in the paragraph that follows?
A.Why cars and buses pollute the air a lot.
B.What kids can do to help stop global warming.
C.What global warming is doing to the environment.
D.Who should be responsible for the environmental problems.

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Against the supposition that forest fires in Alaska,Canada and Siberia warm the climate,scientists have discovered that cooling may occur in areas where burnt trees allow more snow to mirror more sunlight into space.
This finding suggests that taking steps to prevent northern forest fires to limit the release of greenhouse gases may warm the climate in northern regions.Usually large fires destroyed forests in these areas over the past decade.Scientists predict that with climate warming,fires may occur more frequently over the next several centuries as a result of a longer fire season.Sunlight taken in by the earth tends to cause warming,while heat mirrored back into space tends to cause cooling.
This is the first study to analyze all aspects of how northern fires influence climate.Earlier studies by other scientists had suggested that fires in northern regions sped up climate warming because greenhouse gases from burning trees and plants were released into the atmosphere and thus trapped heat.
Scientists found that right after the fire,large amounts of greenhouse gases entered the atmosphere and caused warming.Ozone (臭氧) levels increased,and ashes from the fire fell on far­off sea ice,darkening the surface and causing more radiation from the sun to be taken in.The following spring,however,the land within the area of the fire was brighter than before the fire,because fewer trees covered the ground.Snow on the ground mirrored more sunlight back into space,leading to cooling.
“We need to find out all possible ways to reduce the growth of greenhouse gases in the atmosphere,” scientists said.They tracked the change in the amount of radiation entering and leaving the climate system as a result of the fire,and found a measurement closely related to the global air temperature.Typically,fire in northern regions occurs in the same area every 80 to 150 years.Scientists,however,found that when fire occurs more frequently,more radiation is lost from the earth and cooling results.Specifically,they determined when fire returns 20 years earlier than predicted,0.5 watts per square meter of area burned are soaked up by the earth from greenhouse gases,but 0.9 watts per square meter will be sent back into space.The net effect is cooling.Watts are used to measure the rate at which energy is gained or lost from the earth.
小题1:According to the new findings,taking steps to prevent northern forest fires may________.
A.result in a warming climate
B.cause more forest fires
C.lead to a longer fire season
D.protect the forests there
小题2:The following are the immediate effects after a forest fire EXCEPT________.
A.large amounts of greenhouse gases enter the atmosphere
B.the levels of ozone which is a type of oxygen increase
C.snow on the ground mirrors more sunlight back into space
D.ashes from the fire fall on the ice and darken the surface
小题3:Earlier studies about northern forest fires________.
A.had analyzed all aspects of how northern fires influenced climate
B.had indicated that forest fires would pollute the atmosphere
C.had suggested that people should take measures to protect environment
D.had suggested that the fires would speed up climate warming
小题4:We can infer that forest fires in Alaska,Canada and Siberia may________.
A.warm the climate as the supposition goes
B.cool the climate by reflecting more sunlight into atmosphere
C.make more space for the growth of young trees
D.help to gain more energy rather than release more energy

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