Breathing dirty air can cost someone's life s...

Breathing dirty air can cost someone's life span(寿命) months—even years, a new study finds.Worldwide, air pollution lowers average life spans by a year. Scientists shared their new findings in Environmental Science & Technology Letters.

Air pollution has been linked to many health problems.Most earlier studies has looked at how tiny air pollutants affected rates of illness or death. But now an environmental scientist, Joshua Apte, is going even further. He works at the University of Texas, Austin. He together with his team is looking at life expectancy, hoping to make the threat easier to understand.

PM 2.5 is what scientists call tiny particles of pollution in the air. Higher levels of PM 2. 5 can cause health problems and cut months, if not years, from the average life span. This analysis show show pollution affects life expectancy in different parts of the world.

The World Health Organization(WHO) recommends limiting PM 2.5 to 10 micrograms(微克) per cubic (立方)meter of air. Apte's group used data to try to find how this low level would help people. But meeting the WHO standard won't get rid of health damage from dirty air.That's because even below 10 micrograms per cubic meter pollution still causes huge risks.

Reducing air pollution could increase life expectancy. The scientists also compared how other threats shorten life spans across the globe. These risk factors included smoking and cancer.

These results show that in poor countries, cleaning up dirty air could greatly increase life spans. It could have as big an effect as cleaning up drinking water, or curing lung cancer. However, in wealthier countries air pollution shortens life expectancy by less than half a year. All forms of cancer, in fact, shorten the average life expectancy by more than 3.5 years.“Knowing this can really help people, or policymakers, decide where to spend their money,” says Kirk Smith.

1.What is Joshua Apte's team trying to do?

A.Let people understand air pollution better. B.Know how small air pollutants are.

C.Study the life expectancy of different people. D.Study many different healthy problems.

2.What will happen if one country limits PM 2.5 to 10 micrograms per cube meters?

A.Its people will live a healthy life. B.Its air is very clean.

C.It will get a prize from WHO. D.It still has pollution risks.

3.What can we infer from the last paragraph?

A.Cancer is the leading killer in all kinds of diseases.

B.It's very hard to clean up dirty air in a short time.

C.The study will help different countries take different policies.

D.Reducing air pollution can increase all people's lifespans much.

4.What can be the best title for the text?

A.The Effect of Cancer Is Worse than Dirty Air

B.Air Pollution Is Shortening Lives Worldwide

C.Many Factors Are Affecting People's Health

D.Governments Are Trying to Make Life Span Long

高一英语阅读选择中等难度题查看答案及解析

If ____, the dirty air will lead you to fall ill.

高一英语单项填空简单题查看答案及解析

Ways to Book the Cheapest Flights Possible

Unless you are one of those first-class fliers for whom money is not a problem,1.. But ticket prices change every day, and your tickets could end up costing your whole vacation budget. Don't worry. With a little creativity and a lot of research, it is possible to fly affordably.

Plan Accordingly

If you do not have much flexibility（弹性）in your dates, buy your tickets at least 2-4 months in advance.2.. Air fares will rise steadily as the time nears. However, if you have the flexibility to drop everything and go, last minute deals can save you much.

Set air fare Alerts（新知通告）

No matter when you start your planning, it can be helpful to set email alerts for flights to the destination（目的地）of your choice. There are generally recognized days when air fare is the cheapest（Tuesdays or Wednesdays）,3.. Sometimes the best deal will come through a surprise sale.

4.

Yes, it is way more convenient to fly direct from your home airport to your destination. But this depending on where you live. Sometimes, purposely including a stopover can actually save you money.

Search Single Seats

It may be cheaper to buy each ticket individually（个人地）for the same flight,5.. It works because airlines set different prices for different seats on the same plane! When a group of seats are sold together, the airline often charges the highest price among the group for all the seats.

A.Add A Stop.

B.Always Fly Non-stop.

C.even if you are traveling as a group.

D.but you can't necessarily rely on that.

E.you don't want to spend more than you have to on air fare.

F.That might mean you begin researching 4-6 months ahead.

G.That way you'll have plenty of time to get prepared for the trip.

高一英语七选五中等难度题查看答案及解析

As the price is rising, $100 a month can hardly _____ the cost of his life in such a big city.

A. cover                B. afford                C. include                        D. contain

高一英语单项填空简单题查看答案及解析

Do you think about overseas trip but worry that you might make a less-than-worthy choice because you can’t afford to visit all the places on your wish list before you make your final decision? However, little money doesn’t mean you have to stay at home. 1.

Hug the simple joy with travel. 2. Or even climb to the top of a hill and watch the sun set over the ocean. The simple joy of being in a new place is just a matter of going some place new. No tour package required.

3. People need fresh air, exercise, creative excitement, a new relationship and so on. All of these things are simple to get and most of them are free. For fresh air, go outside. For exercise, go out for a jog. For creative excitement, go somewhere new, such as a neighbourhood near your accommodation or just a local market. For a new relationship, make friends with the locals. And you can get a better understanding of the native civilization.

Go slowly. If you live in New York and want to take a 2-week vacation to Africa, it will be very tough to travel with low cost. Time is not money. 4. Instead of buying a plane ticket, take a train or bus, or just hop your bike and ride away from the town. The slower you travel, the less money you will spend.

Try to get your accommodation for free or next-to-nothing. Find kind souls around the world who agree to offer an extra bedroom, sofa, or a corner of the floor to travelers in exchange for the same kindness when they visit your town. This plan involves trading homes for an agreed-on amount of time. 5.

A.Time can be free.

B.Keep your needs to the lowest degree.

C.Walk on the streets of a city and chat with a local.

D.Things like air and water are much cheaper once you get outside.

E.With a bit of creativity and some tricks, you can travel the world cheaply.

F.If you can do what needs to be done around the house, just stay inside for free.

G.It works best if your home is in a place someone wants to visit during your vacations.

高一英语七选五中等难度题查看答案及解析

Years ago, I lived in a building in a large city. 1. There was a woman living there, and I had never met her, yet I could see she sat by her window each afternoon, sewing or reading.

After several months had gone by, I began to notice that her window was dirty. 2. I would say to myself. “I wonder why that woman doesn’t wash her window. It really looks terrible.”

One bright morning I decided to clean my apartment, including washing the window on the inside.

Late in the afternoon when I finished the cleaning, I sat down by the window with a cup of coffee for a rest. What a surprise ! Across the way, the woman sitting by her window was clearly visible (看见). 3.

Then I came to understand that I had been criticizing (批评) her dirty window, but all the time I was watching hers through my own dirty window.

4. How often had I looked at and criticized others through the dirty window of my heart, through my own shortcomings (缺点)?

Since then, whenever I wanted to judge someone, I asked myself first, “Am I looking at him through my own dirty window?” 5.

A.Her window was clean!

B.She got on quite well with her neighbors.

C.I should respect others’ opinions and beliefs.

D.That was quite an important lesson for me.

E.Everything was unclear through the dirty window.

F.The next building was only a few feet away from mine.

G.I try to clean the window of my own world to see the world about me more clearly.

高一英语七选五中等难度题查看答案及解析

Many college students complain about dormitory life： a sweltering room without air﹣conditioning in summer and a dormitory gate which is closed at 11 pm. But they may miss their dormitories after graduation，when they have to spend as much as a third of their income renting a shabby room.

The rising prices of daily necessities， including food， water， gas and electricity， are also making graduates save every penny to make ends meet.

Faced with the high cost of living， college graduates need to make every penny work when they budget their income.

When it comes to renting， try to spend no more than one third of your income on it.Better still， only spend a quarter， according to Hao Qian， a career consultant（咨询师）.

Hao also reminds graduates to set aside about one fifth of their income for social activities. "People have spent more on their social lives because of changes in forms of entertainment，"said Hao. For example， new friends may want to meet you at a quiet club instead of at a noisy house.

In spite of the high cost of living， many college graduates still， try to stay in big cities.They usually work in industries such as finance， public relations and IT， which depend on a booming city economy and technology.

Hao advises such graduates to reduce their expenditure on shopping as much as possible."If you are not in jobs such as PR and sales which require you to dress well， you don't need to spend much on clothes and " accessories ，" said Hao."Spend less than one eighth of your monthly income on shopping. "

1.What does the underlined word "sweltering" in the first paragraph probably mean？

A.Hot and airless.

B.Damp and narrow.

C.Simple and dull.

D.Comfortable and rich.

2.Which item takes up the most income of the graduates according to Hao Qian？

A.Travel.

B.Shopping.

C.Social activities.

D.Renting.

3.How does the author begin the text？

A.By making comparisons.

B.By making analysis.

C.By using an example.

D.By describing processes.

4.We can know from the text that　　　 　.

A.the money spent on social activities is mainly to broaden business cooperation

B.it's unwise to meet your new friend in your dormitory with loud roommates

C.more and more graduates choose to work in small towns or medium cities

D.if you take up a PR job in a firm， you can wear casual clothes

高一英语阅读选择中等难度题查看答案及解析

The martial art of Tai Chi is on the rise as more and more people discover the benefits that come from regular practice.1.With its gentle movements and focus on forms, it' s also a good way to relax and calm the mind while it energizes and build the body.2."Chi" means energy, and it's the focus on energy that makes it different from other martial arts. Tai Chi practitioners believe that, in a struggle, meeting force with force only hurts both parties.

Tai Chi is quite easy to learn. Many recreation centers and community groups offer classes, sometimes in parks and other public places.3.Wear loose and comfortable clothing and shoes, and you can just join in.

One of the major benefits of Tai Chi is that it's a sport you can practice for life. In China, many elderly people continue to do Tai Chi into their eighties and nineties, and the strengthening and balance moves are hugely beneficial to their continued mobility.4.As you focus on your breathing and posture, your mind can clear itself of its worries, which does good to your whole body.

5.All you need is your own body and enough room to stand in. You can do Tai Chi on a mountaintop, in a park, on an ocean beach, or in the middle of a forest. It's a perfect camping activity, and it's a lot of fun. So next time you see someone doing Tai Chi, ask them about it. They might offer to teach you the forms of this fascinating sport.

A.Tai Chi is more than a just a sport.

B.There are many styles and forms of Tai Chi.

C.Best of all, Tai Chi can be performed anywhere.

D.Tai Chi's true name in Chinese is Tai Chi Chuan.

E.More old people than young men practice Tai Chi

F.Often these classes are free and open to anyone who shows up.

G.Also, the slow moves and focus make Tai Chi a relief from stress.

高一英语七选五简单题查看答案及解析

Scientists have discovered a new kind of invisible ink. It’s called water. And all you need for this secret-messaging ink to work is to write with it on a super-hi-tech piece of paper coated with special chemicals. 1. It shows up darker than the surrounding paper under UV(紫外线的)　 light.

When the message has been read and needs to be hidden again, get out your hairdryer, and blow some warm air on the paper. 2.　　

Using hot air from a hairdryer for 15-30 seconds, you were able to reuse the special paper up to 30 times because the heat reorganized the chemical structure of the paper coating. 3.

The invention was made by a group of scientists in China, led by Qiang Zhao of the Institute of Advanced Materials, Nanjing University of Posts and Telecommunications.

Although much of modern communication is digital(数码的), there are still some situations in which it is important to send messages on a piece of paper, such as when the people don’t have Internet. 4. But the problem has always been how to get rid of a message once it has been shown so no one else can read it.

5.. To use it, write with the lemon juice on ordinary paper, iron(熨) the paper with a hot iron and the hidden message will appear. The downside(缺点) is that the paper has to be destroyed to hide the message so no one else can read it.

A.How to make the invisible ink? Follow the steps.

B.Invisible inks have long been used to send secret messages.

C.Without the heat, the message stayed visible for up to three months.

D.Previously, the most readily available invisible ink was lemon juice.

E.Shine a UV light on the coated paper and the water message becomes visible.

F.Then the message will be gone and the paper can be reused, which keeps costs low.

G.Putting water on the paper broke up the structure of the chemicals it was coated with.

高一英语七选五中等难度题查看答案及解析

听下面一段较长对话，回答以下小题。

1.How much did it cost to run an air conditioner 24 hours a day for 2 months 5 years ago?

A. $20.　　 B. $35.　　 C. $40.

2.Where do they live now?

A. In a college dormitory which is not air-conditioned.

B. In an expensive hotel.

C. In an apartment with an air conditioner.

3.Where is the boy going to study?

A. In the library,　　 B. In the dormitory.　　 C. In the comfortable apartment.

高一英语长对话困难题查看答案及解析