In cooperation with German experts, Several s...

In cooperation with German experts, Several scientists from the University of Bradford believe that they finally solved a mystery that has been confusing millions of people: why our hair turns gray with age.

The researchers came up with their results by examining native hair and cells from human hair follicles（毛囊）. They say the secret turns out to be hidden in catalase（过氧化氢酶）, which is causing hair to turn gray.

Catalase production goes down with age and stress, allowing hydrogen peroxide（过氧化氢） in the hair to do its favorite job—making hair gray, and then white, by blocking the normal production of melanin（黑色素）. Melanin is our hair's natural pigment that is responsible for the color of hair. It also determines the color of our eyes and skin.

Dr. Gerald Weizmann, an editor of a journal, says," All of our hair cells make a tiny bit of hydrogen peroxide, but as we get older, this little bit becomes quite a lot, and our hair turns gray and then white."

The new study brings hope for millions of people who have to color their hair: to finally obtain some shampoo that will decrease levels of hydrogen peroxide and therefore restore gray or white hair to its natural color or even prevent it from turning gray.

The researchers are already conducting an experiment with such a drug on a few volunteers with gray hair and expect to get the results in the next two to three months. If everything works out, millions of people will choose between this drug and other previously used expensive dyes. However, even if the drug works, it will take at least several years before it can be brought to the market.

1.What is the passage mainly about?

A. The effect that gray hair has on people.

B. The chemical elements of people's hair.

C. The reason why people's hair turns gray.

D. New drugs to prevent people's hair from turning gray.

2.According to the passage, people's hair turns gray because of______.

A. a decrease in catalase　　 B. the death of hair cells

C. the production of melanin　　 D. a decrease in hydrogen peroxide

3.Which of the following statements is TRUE according to the passage?

A. The new study shows it's harmful to color our hair with dyes.

B. Dr. Gerald Weizmann is in charge of the new drug experiment.

C. Our hair cells make lots of hydrogen peroxide when we are young.

D. We may restore our gray or white hair to its natural color with shampoo.

4.What can we learn from the last paragraph?

A. Only a small number of people can use the new drug.

B. Most of the volunteers in the experiment are old people.

C. The drug cannot be brought to the market soon even if it works.

D. The researchers have already known the results of the experiment.

高三英语阅读理解困难题查看答案及解析

This year, Facebook, the social media website, announced that it would cooperate with several news organizations —including The New York Times, The Guardian, and the BBC —to place news stories directly into users’ personal Facebook webpage. Stories published using Facebook Instant will load more quickly and keep the style of the original publisher, who will keep all the advertising income the stories earn —at least for now. The deal shows how important social media has become to news organizations, and it is a clear sign of how the world of news is changing —and has been for a while.

Many thought of it as the death of the newspaper, when Google News began in 2002. It had no human editor. Instead, Google used, and still uses, a secret computer program that selects and displays news stories according to the reader’s personal interests. More recently, Associated Press and Yahoo have been punishing computer-written articles. Both use special software to automatically produce stories about company financial results and sports reports —areas where the quality of writing is felt to be of secondary importance to the accuracy of the data.

I think we should be concerned about such developments. One concern is that Facebook, Google and other social media websites see journalism as a sideline(副业), a way of putting people in front of advertisements. It isn’t their primary function —so if it stops making them lots of money, they're likely to stop doing it.

There’s another concern that computer-written articles are not actually journalism at all, because what a human news team produces is actually quite complex. A well-written news story puts information in context, offers a voice to each side of an argument and brings the public new knowledge.

Though economics and speed of delivery mean readers will probably choose a computer-written story over a carefully shaped article — at least for daily news —I don’t think the computers will be writing any in-depth articles for a while yet.

1.What is the main purpose of the article?

A. To report on a new computer service offered by Facebook.

B. To advise readers against reading computer-written news.

C. To express concern about recent trends in online news.

D. To describe the process of online news reporting.

2.Computer-written news reports have so far focused on sports and finance because ________.

A. these are the most popular topics for online readers

B. writing style is less important than accuracy in these areas

C. information on these topics is more easily available

D. there are fewer journalists specializing in these areas

3.What does the underlined word “It” in Paragraph 3 refer to?

A. Journalism.        B. Advertising.        C. Facebook.        D. Business.

4.In Paragraph 4, which of the following is mentioned as a characteristic of a well-written news article?

A. The information presented is up-to-date.

B. The author's opinion is clear

C. The language used is vivid.

D. Different views on the topic are presented.

高三英语阅读理解中等难度题查看答案及解析

This year, Face book, the social media website announced that it would cooperate with several news organizations — including The New York Times, The Guardian, and the BBC — to place news stories directly into users’ personal Face book webpage. Stories published using Face book Instant will load more quickly and keep the style of the original publisher, who will keep all the advertising income the stories earn — at least for now. The deal shows how important social media has become to news organizations, and is a clear sign of how the world of news is changing — and has been for a while.

Many thought of it as the death of the newspaper, when Google News began in 2002. It had no human editor. Instead Google used, and still uses, a secret computer program that selects and displays news stories according to the reader’s personal interests, More recently, Associated Press and Yahoo have been publishing computer-written articles. Both use special software to automatically produce stories about company financial results and sports reports — areas where the quality of writing is felt to be of secondary importance to the accuracy of the data.

I think we should be concerned about such developments. One concern is that Facebook, Google and other social media websites see journalism as a sideline （副业）, a way of putting people in front of advertisements. It isn’t their primary function — so if it stops making them lots of money, they’re likely to stop doing it.

There’s another concern that computer-written articles are not actually journalism at all, because what a human news team produces is actually quite complex. A well-written news story puts information in context, offers a voice to each side of an argument and brings the public new knowledge.

Although economics and speed of delivery mean readers will probably choose a computer-written story over a carefully shaped article — at least for daily news — I don’t think the computers will be writing any in-depth articles for a while yet.

1.What is the main purpose of the article?

A. To report on a new computer service offered by Facebook.

B. To advise readers against reading computer-written news.

C. To express concern about recent trends in online news.

D. To describe the process of online news reporting.

2.Computer-written news reports have so far focused on sports and finance because ________.

A. these are the most popular topics for online readers

B. writing style is less important than accuracy in these areas

C. information on these topics is more easily available

D. there are fewer journalists specializing in these areas

3.What does the underlined word “It” in Paragraph 3 refer to?

A. Business.　　 　 B. Advertising.

C. Facebook.　　　　　 D. Journalism.

4.In Paragraph 4, which of the following is mentioned as a characteristic of a well-written news article?

A. The information presented is up-to-date.

B. The author’s opinion is clear.

C. The language used is vivid.

D. Different views on the topic are presented.

高三英语阅读理解简单题查看答案及解析

LONDON----Here’s a new warning from health experts: Sitting is deadly.

Scientists are increasingly warning that sitting for prolonged 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," Ekblom-Bak said. 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 were spread across the day, rather than in a single bout.（一回）

　Still, in a study published last year that tracked more than 17,000 Canadians for about a dozen years, researchers found people who sat more had a higher death risk, independently of 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 2003-2004 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," Ekblom-Bak said. "But when they’re in the office, they should try to interrupt sitting as often as possible," she said.

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

2.According to the research,______________.

A. the more time you spend in exercising in a single bout, 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 effect of sitting too much.

D. you had better not sit for more than four hours in a single bout.

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.

4.In the opinion of Ekblom-Bak, you’d better have a rest in the office by________.

A. sending your friends e-mails

B. having a walk around your office

C. chatting online or playing computer games

D. listening to music with your head on the desk.

高三英语阅读理解困难题查看答案及解析

134. The German expert you saw just now works in a cotton textile _____ , a joint venture enterprise in China.

高三英语单项填空简单题查看答案及解析

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.

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

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

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.

4.The underlined word “offset” in Paragraph 10 most probably means “________”．

A．improve　                         B．avoid

C．ignore　                             D．achieve

高三英语阅读理解中等难度题查看答案及解析

A team of scientists from University of Freiburg in Germany are developing a shoe with a sensor to automatically tie its laces(鞋带)that could be taken off when users click their heels together．

It’s been 26 years since we saw them magically tightening Marty McFly’s Nike boots in the film Back to The Future．

Now，self-tying shoelaces could actually become a reality this year，proving right one of the film’s fantastical predictions for what 2015 would be like．

Engineers have designed a shoe that can automatically lace up，adjusting itself to the shape of your foot．

Simply slip the controller on and pressure sensors will tell the ‘smart shoe’ when your foot is in position，triggering(触发)a tiny motor in the heel that pulls the laces tight.

When you want to take off the shoes，you click your heels together twice and the motor will release a spring(弹簧)in the shoe’s tongue，which loosens the laces enough for you to slip them off．

And the invention doesn’t even need to be plugged in to charge or have its battery replaced because it runs on power generated by the swing of your foot as you walk.

Engineer K1evis Ylli，of the Institute for Micromachining and Information Technology in southern Gemany，said the shoes could help a variety of different people.

“One focus is that it could be used in shoes for elderly people who have mobility problems，”he said．“But it could also work for children，or as a lifestyle product．”．

The design，which is still in a prototype(雏形)stage，cleverly gets the energy of the foot’s swing when opposing magnets in each shoe move past each other. It then uses that power to charge a battery．An hour of walking is enough to tighten the laces once，and it requires no energy to undo the shoes because that relies on the spring alone.

1.Which of the following can be the best title of the text?

A．A fantastical prediction

B．A great invention in Germany

C．A shoe with self-tying laces

D．A popular lifestyle product

2.What can we learn about the shoes?

A．They can automatically take off．

B．They can adjust themselves to your foot．

C．They need to be charged once．

D．They have been in design for 26 years．

3.From the last paragraph we can know ____________．

A．the shoes have been put into use

B．the shoes need power to take off

C．the shoes promise to be popular

D．how the shoes work to produce energy

高三英语阅读理解中等难度题查看答案及解析

A team of scientists from University of Freiburg in Germany are developing a shoe with a sensor to automatically tie its laces(鞋带)that could be taken off when users click their heels together．

It’s been 26 years since we saw them magically tightening Marty McFly’s Nike boots in the film Back to The Future．

Now，self-tying shoelaces could actually become a reality this year，proving right one of the film’s fantastical predictions for what 2015 would be like．

Engineers have designed a shoe that can automatically lace up，adjusting itself to the shape of your foot．

Simply slip the controller on and pressure sensors will tell the ‘smart shoe’ when your foot is in position，triggering(触发)a tiny motor in the heel that pulls the laces tight.

When you want to take off the shoes，you click your heels together twice and the motor will release a spring(弹簧)in the shoe’s tongue，which loosens the laces enough for you to slip them off．

And the invention doesn’t even need to be plugged in to charge or have its battery replaced because it runs on power generated by the swing of your foot as you walk.

Engineer K1evis Ylli，of the Institute for Micromachining and Information Technology in southern Gemany，said the shoes could help a variety of different people.

“One focus is that it could be used in shoes for elderly people who have mobility problems，”he said．“But it could also work for children，or as a lifestyle product．”．

The design，which is still in a prototype(雏形)stage，cleverly gets the energy of the foot’s swing when opposing magnets in each shoe move past each other. It then uses that power to charge a battery．An hour of walking is enough to tighten the laces once，and it requires no energy to undo the shoes because that relies on the spring alone.

1.Which of the following can be the best title of the text?

A．A fantastical prediction

B．A great invention in Germany

C．A shoe with self-tying laces

D．A popular lifestyle product

2.What can we learn about the shoes?

A．They can automatically take off．

B．They can adjust themselves to your foot．

C．They need to be charged once．

D．They have been in design for 26 years．

3.From the last paragraph we can know ____________．

A．the shoes have been put into use

B．the shoes need power to take off

C．the shoes promise to be popular

D．how the shoes work to produce energy

高三英语阅读理解中等难度题查看答案及解析

New Scientist Discovery

Tour Amazing science-inspired tours across the globe with experts on board and in the company of fellow travelers who enjoy the discovery of science

Space: Past and Future: USA

14 days for £4.799

Departing 6th May and 14th September 2020

Follow the USA's footsteps in exploring space with this comprehensive tour of NASA's space centers and other key sites, including the Very Large Array in attractive New Mexico. Plus, visit the world's first commercial spaceport with leading researchers.

The Science of the Renaissance（文艺复兴）: Italy

7days for £1,825

Departing 3rd March and 3rd November 2020

Embark on a cultural adventure to the great science cities of Florence and Bologna, as architecture expert Andrew Spira and science historian Professor David Wootton guide you through the great discoveries and minds of the Renaissance.

Land of Fire and Ice: Iceland

8 days for £2,249

Departing 31st October and 7th November2020

Marvel at erupting geysers（喷泉）, glaciers and waterfalls on a trip of volcanic and geological（地质的）adventure. Joined by volcanologist Tamsin Mather, discover the best of Iceland with a chance to see the Aurora Borealis.

Tiger Conservation Safari: India

9 days for £3,850

Departing 10th April 2021

Involve yourself in jungle life in the search for the Bengal tiger. Learn how to protect the rich wildlife you encounter at India's reserves, complete with a masterclass in tracking and stay in a cozy lodge（小屋）.

1.Which tour is scheduled in May?

A.Space: Past and Future: USA

B.The Science of the Renaissance: Italy

C.Land of Fire and Ice: Iceland

D.Tiger Conservation Safari: India

2.How much will it cost if you are interested in Florence?

A.£4,799. B.£1,825.

C.£2,249. D.£3,850.

3.What can tourists do during the Iceland tour?

A.Explore space with researchers.

B.See geysers，glaciers and waterfalls.

C.Discover the culture of the Renaissance.

D.Learn about protecting wildlife while travelling.

高三英语阅读理解简单题查看答案及解析

A research project jointly carried out by scientists from several British universities and institutes has drawn people’s attention to the toothbrush again.

Researchers have found that your toothbrush is home to more than 100 million bacteria. But there are hundreds of microorganisms in the mouths and your toothbrush probably won’t make you sick unless there is an unhealthy balance of bacteria. Our immune system can usually take care of bacterial invaders. However, if others use your toothbrush, or you use someone else’s, bacteria can be spread.

They have also found the toothbrush holders are the third-most dirty household items (behind dish sponges and kitchen sinks), thus advocating cleaning the toothbrush holder regularly.

The storage of your toothbrush in your bathroom is also important. Here are some storage tips from the researchers to keep your toothbrush as healthy as possible:

 Put your toothbrush as far away as possible from the toilet flushing.

 Let your toothbrush dry thoroughly between brushings.

 Don’t use toothbrush covers, which can create a perfect breeding ground for bacteria.

 Keep your toothbrush upright in a holder. rather than lying down.

 Keep toothbrushes separate. If toothbrushes touch, they can exchange and spread bacteria.

There are products available that claim to sanitize（消毒）your toothbrush. While some of these products do kill　 some　 bacteria, there is　 no　 evidence that　 using them will　 reduce your　 risk　 of　 illness,　 according to　 the researchers.

They recommend replacing your toothbrush every three to four months or more often if you are sick or if you have a weakened immune system. Children’s toothbrushes may need to be replaced more often than adult brushes.

1.Who will probably find this text helpful?

A. People concerning their heath

B. People decorating their house

C. People caring about their diets

D. People carrying out experiments

2.What can we infer from the text?

A. Products of sanitizing the tooth brush are of no use at all.

B. Adults need to replace toothbrushes more often than children.

C. Sharing your toothbrush with others may be harmful to your health.

D. Your toothbrush will probably make you sick if there is a healthy balance of bacteria.

3.What are people advised to do in the text?

A. Clean the toothbrush holder regularly.

B. Keep the toothbrush covered after the use.

C. Keep the toothbrush lying down after using it.

D. Have the toothbrush dry partly between brushings

4.Which might be the best title for the text?

A. How to Replace Your Toothbrush Economically?

B. How to Clean Your Toothbrush Correctly?

C. How to Store Your Toothbrush Healthily?

D. How to Use Your Toothbrush Properly?

高三英语阅读理解困难题查看答案及解析