It is the golden decade,the time in your life when you are carefree and at your happiest.Never again will you enjoy the freedom and thrills of your 20s.A new study has now confirmed the fears of anyone approaching middle-age-people's 20s are their happiest years.
But,while researchers warn of lower life satisfaction for 40 years,there is hope.Their findings show that life does get better at 65,with happiness levels rising.Dr Ioana Ramia,from the University of New South Wales in Australia,said,"Satisfaction over life decreases from the early 20s,plateaus for about 40 years and then increases from about 65 up."
The aim of the research was to help develop policy to target specific age groups.Dr Ramia and her team found that happiness follows a U-curve with the highest levels experienced by those aged 15 to 24 and over 75.
Dr Ramia said,couples reported greatest satisfaction at life just before having their first child and a decrease from the child's first year of life through to when the child reaches six years old and starts school.She said,"It then stays low,but increases slightly,and is the highest around the age of 80.So that's something to look forward to."Her team's research shows a strong connection between the middle-age happiness state and employment opportunities and financial situations,when"money and...jobs matter most".
There was a greater emphasis on the quality of housing itself into middle age and beyond,along with neighborhood and community."At this time happiness is at its lowest and it only starts to increase when people start focusing on other things,like their free time,"said Dr Ramia.Safety was an important aspect of life satisfaction in every age group,while health appeared twice-in the mid-30s with the first awareness of physical fallibility or illness,and again later in life,she said.
Though her research had shed some light onto the drivers of happiness,Dr Ramia said the peak at young and old age remained poorly understood,with question marks around how satisfaction could remain constant across the major parameters described yet manage to increase with age overall. Defining what"satisfaction"was and how it was rated by subjects was also a challenge for future research,she said.
1. The early 20s are thought to be the happiest years possibly because people| A．enjoy their school life very much then |
| B．can enjoy more freedom during that period |
| C．usually have lots of friends in those years. |
| D．are going to have their own family in their life |
| A．keeps a relatively stable level |
| B．keeps changing |
| C．reaches a very low level |
| D．turns more complex |
| A．the factors influencing people's satisfaction at life |
| B．the differences between the young and the old |
| C．the reasons why happiness follows a U-curve |
| D．the matters concerning the middle-aged group |
| A．We still have a poor understanding on the old. |
| B．The drivers of happiness need further research. |
| C．It's still a challenge to remain happy in our life. |
| D．People are hard to be satisfied because of their age. |
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【推荐1】Go on a 15-minute Tour
Didn’t someone say that life is about the journey, not the destination?
To commit some time to the journey, take some time to walk around where you work and notice your surroundings.
After your first observation tour, select a different day to tour your workspace for moods. Other people’s moods can provide you with critical clues about how things are going.
Schedule 15 minutes to tour your workplace twice a week for a month and be sure to avoid making too many assumptions or conclusions — just simply observe.
| A．You’ll be amazed at what you see along the way. |
| B．Spare a little time to closely monitor each person’s progress. |
| C．Notice what people may be feeling when you drop by to talk briefly. |
| D．During any workday, take just 15 minutes to observe neglected things. |
| E．You generally love the breathtaking landscape and people’s performances. |
| F．Going on a short tour will help you get in tune with other people and their emotions. |
| G．To become socially aware, remember to enjoy the journey and notice people along the way. |
【推荐2】For most people traveling abroad, their first choice is probably to make a beeline for (直奔) tourist sights. For me, I find lots of joy in grocery (食品杂货店) shopping on holiday.
As a vegetarian (素食主义者), finding restaurants that meet my needs is not always easy abroad.
The variety of foods attracts me every time I travel somewhere new. In Malta, I found the most delicious chocolate-filled cakes, a product I would struggle to find even in the UK.
Grocery shopping on holiday sounds unusual. But it means being involved in the day-to-day lives of a country’s citizens. I can pretend I am a local and put myself in their shoes. I can watch kids begging their parents for sweets, an international experience that needs no language, or watch couples pick up snacks and drinks for a party on a Friday night.
| A．I ended up eating these every day for breakfast. |
| B．The challenge of finding food is interesting, too. |
| C．So I always make sure to book a place with a kitchen. |
| D．Grocery shopping was a vital part of the holiday experience. |
| E．It’s an act of understanding people as much as of buying food. |
| F．Corn pancakes always require a trip to the bigger grocery store. |
| G．By wandering around in a new country, I start to see what they value. |
Do your research first. Don't just trek off into the wilderness; get a solid understanding of your surroundings first. Studying a map of the area where you're going -- and making sure to bring it with you -- will increase your chances of not getting lost tremendously. Educate yourself about the flora and fauna of the area you are exploring.
Don't panic if you’re lost. Panic is more dangerous than almost anything else, because it interferes with the operation of your single best, most useful and versatile survival tool: your mind. The moment you realize that you are lost, before you do anything else, stop.
Signal your location. Make noise by whistling, shouting, singing, or banging rocks together.
| A．Bring a means of communication. |
| B．If you can, mark your location in such a way that it's visible from the air. |
| C．Knowledge of the local plants and animals can save your life |
| D．If you want to know how to survive in the woods, just follow these steps. |
| E．Starvation won't be a big problem. |
| F．Take a deep breath and stay calm. |
| G．Having strength in numbers will help you survive. |
【推荐1】You can tell the man sitting next to you in the movie theater is a smoker, you can smell it on his clothes. But since he's not lighting up and smoking your way, it's OK, right? Not at all. A new study out of Yale University says thirdhand smoke is also dangerous.
Thirdhand “smoke” isn't actually smoke at all. It's the tobacco contaminants （烟草污染物） that stick to walls, bedding, carpet and even a smoker's body and clothes.
Science has known about the environmental pollution caused by smoking for years, leading to the creation of smoking and non-smoking rooms at hotels, restaurants and the like. But thirdhand smoke has also been found in environments that were not known to be polluted by smokers, leading researchers to ask how that could happen.
To find out, Professor Gentner and his students set up an experiment in a movie theater that had not allowed smoking for more than 15 years. They supplied fresh air into the theater, making sure no smoking or other pollutants entered it. Special equipment measured the elements in the air before and after moviegoers arrived.
The team saw a sharp increase in levels of dangerous chemicals. As people came into the theater, the concentrations （浓度） went up, and then dropped over time. But they didn't completely disappear after the audience left. In many cases, the lasting pollution was noticeable the following day in the empty theater. Pollution happened where smoking had never occurred. Even more worrying: the harm of it could equal that of smoking 10 cigarettes by the end of the movie.
“If future research has the same findings on thirdhand smoke, it means that smokers could potentially still do harm even if the act of smoking took place in a different space.” said Narula, a doctor who was not involved in the research. “And the only way to be free from thirdhand smoke is nothing short of banning （禁止） smoking everywhere.”
1. What do we know about thirdhand smoke?| A．It is the main factor of environmental pollution. |
| B．It causes much less harm than smoking cigarettes. |
| C．It's the remains of harmful chemicals from smoking. |
| D．It does not occur in an environment without smokers. |
| A．Add some background information. |
| B．Introduce the procedure of the experiment. |
| C．Provide some research data for the readers. |
| D．Make a summary of the previous paragraph. |
| A．Concentrations. | B．People. | C．Levels. | D．Dangerous chemicals. |
| A．Smokers should keep away from non-smokers. |
| B．The harm of thirhand smoke remains to be proved. |
| C．Future research will hardly produce the same result. |
| D．There is no way to remove the harm of thirdhand smoke. |
【推荐2】Honesty and humility best predictors of job performances
A latest study finds that ratings of honesty and humility among employees may predict how their bosses view job performance.
Over a period of a year and a half, Dr. Wade, a professor Baylor University, and his team conducted online surveys of about 270 employees from 25 companies in the health care field.
Employees who self-reported high levels of honesty and humility consistently received better job performance reviews by their supervisors.
Wade acknowledges that honesty and humility will not predict job performance in every field, especially for jobs where a high level of self-promotion is necessary, such as sales roles or entertainers. He said, however, that in many workplaces, employees who show honesty and humility will be liked by their colleagues.
| A．Those invited are honest and humble. |
| B．Honesty and humility in jobs are essential. |
| C．Partly difficult to measure, humility is alternative. |
| D．They are trustworthy, down-to-earth, and easy to relate to. |
| E．Most worked in jobs that involved one-to-one care of challenging clients. |
| F．As honesty and humility increase, inspector ratings of job performance increase. |
| G．Participants in 20 states were asked to self-report on their own character qualities. |
【推荐3】Over 7,000 species around the world are considered endangered. That number doesn’t even include the plants, animals, and other lifeforms that are listed by some scientists as vulnerable, critically endangered, or extinct in the wild.
The International Union for Conservation of Nature (IUCN) maintains the most-comprehensive list of endangered species around the world. The Red List of Threatened Species, as it’s called, judges each species on five different standards for an in-depth scientific approach. According to the IUCN, an endangered species is one that meets any one of the following criteria (标准): a 50%-70% population decrease over 10 years, a total geographic area less than 5,000 square kilometers, a population size less than 2,500 adults, a restricted population of 250 adults, or a statistical prediction that it will go extinct within the next 20 years.
Though the IUCN’s Red List covers a wide range of what qualifies as an endangered species, it doesn’t quite say how a species reaches those low points. Prepare to feel guilty: the most common factor when it comes to species decline is human intervention. Loss of habitat, the introduction of a foreign species into the environment, hunting, pollution, disease, and loss of genetic variation (基因变异) are all causes of species decline and most often are a result of human activities. Take the bald eagle for example: the rise in human population and urban development of North America limited the animal’s habitat; an increase in hunting the eagles for sport lowered their population size; and the use of the pesticide DDT on farms harmed the animal’s reproductive capabilities.
But even though humans are the number one cause of species decline, classifying species as endangered encourages action to reverse the effects of human intervention. Conservation efforts by the US Fish and Wildlife Service criminalized (使非法) the hunting of bald eagles and the use of the pesticide DDT in the mid- to late 20th century. The effect was positive, as bald eagles have been on the rise and were taken off the endangered species list in 1995.
1. Which of the following species can be considered endangered?| A．One that will go extinct within the next 50 years. |
| B．One whose population size is less than 5,000 adults. |
| C．One whose habitat is less than 2,500 square kilometers. |
| D．One whose population decreases 20% over twenty years. |
| A．The causes of species decline. |
| B．The disadvantages of the pesticide. |
| C．A list of worldwide endangered species. |
| D．Common features of endangered species. |
| A．To show its rareness. |
| B．To blame humans for its decline. |
| C．To stress its importance in nature. |
| D．To show the meaning of ranking it endangered. |
| A．Entertainment. | B．Health. | C．Science. | D．Education. |
【推荐1】What if there was a kind of technology that could help someone with low or no vision increase their spatial (空间的) awareness? Eugene Choi, Raffu Khondaker, Irfan Nafi and Pranav Ravella founded Team Atheia and set out to do just that. The four teenagers are students at Thomas Jefferson High School for Science and Technology in Virginia, US.
“We noticed that the computer-vision field has gotten to a point where it could detect objects with really good accuracy and describe a scene just like a human would,” Choi told IEEE Spectrum magazine. “The immediate application we thought of was a visual aid for people with low or no vision.”
Since 2019, they had been attempting to make an assistive (辅助的) device in the form of a glove with a camera—but it failed. They realized that they lacked input from potential users. So they used Facebook to find people with vision problems and ask about their needs. Based on the feedback collected, the team scrapped the glove and started developing wrist- and head-worn devices and eventually a mobile app.
After spending hundreds of dollars of their own money and much experimentation，they finally had a working prototype (原型). By adopting the latest computer-vision models and machine learning techniques, the students’ app Atheia can accurately recognize, count and pinpoint (精准确定) objects in the user’s field of view. It can even answer open-ended questions about the person's environment, such as the shapes and sizes of objects or the time of day.
Their app’s data is processed locally on the mobile device instead of through a cloud service. This means they can fulfill user requests regardless of whether they have a cellular signal (蜂窝信号).“Through our testing, we realized how critical it was to serve our users no matter where they were,” Ravella told Congressional App Challenge. “It was an immense(极大的) challenge to convert our huge，heavy computer-vision models into something an iPhone could run. But thanks to Apple’s Neural Engine, it was possible—and worth it.”
Compared to other assistive devices for the blind, Atheia will charge its users an affordable monthly subscription (订阅) fee of around $10 (about 63.7 yuan), and it will be available only on iOS.
1. What do we know about Atheia?| A．It can remove physical barriers for people with no vision. |
| B．It can answer all questions raised by users. |
| C．It’s more expensive than other similar devices. |
| D．It can help the blind improve spatial awareness. |
| A．Adjusted. | B．Abandoned. | C．Adopted. | D．Upgraded. |
| A．They didn’t know the needs of their target users |
| B．They lacked the money to use the latest technology. |
| C．Their models were too big for an iPhone to run. |
| D．They found it difficult to popularize their product. |
| A．Ambitious and sociable. | B．Creative and humorous. |
| C．Intelligent and modest. | D．Innovative and determined. |
【推荐2】Men are as likely as women to suffer from postnatal (产后的) depression, a study shows. One in ten fathers — the same ratios as mothers — are found to suffer before or after birth. By the time their child reaches 12 weeks, as many as one in four are feeling down.
The symptoms observed in the American study are not thought to be hormonal — as they are in women — and are instead probably a response to the pressures of fatherhood. These include the expense of having children, changed relationship with partners and fear of paternal (父亲的) responsibility. In the early weeks, the lack of sleep and extra domestic chores also take the toll.
The study put the overall rate of depression among new fathers at 10.4 percent — double the estimated 4.8 percent for all men in any 12-month period. Around 8 percent were affected in the 12 weeks before and after birth, according to the Eastern Virginia Medical School Research. The study found parents were more likely to be down if their partner was too.
It is estimated that around one in ten women suffers postnatal depression, even if they have never had mental health problems. Without treatment the condition can last for months. Although most women have a few days of “Baby Blues” shortly after birth, postnatal depression can kick in up to six months later. Experts say that paternal depression is serious because it can have “substantial emotional, behavioural and developmental” effects on children.
1. The “Baby Blues” effect among fathers may be caused by the following except _____.| A．domestic chores |
| B．fatherhood pressure |
| C．paternal responsibility |
| D．hormone imbalance |
| A．Cost a lot of money. |
| B．Take the lead. |
| C．Have a bad effect. |
| D．Have no links. |
| A．Therapy for Depression |
| B．Father Getting Baby Blues |
| C．Effects of Father Blues |
| D．Postnatal Recovery |
【推荐3】Microsoft plans to erase its entire carbon footprint since its foundation in 1975. Microsoft aims to accomplish "carbon negative" by 2030, meaning that it will erase more carbon from the environment than it emits(排放). The company will minimize carbon emissions across its entire supply chain to zero. And the following step is to clean up all the carbon emissions it has produced since 1975, when it was founded. What the company further proposed was that it would try to push for policies to price carbon and help clean energy technology develop faster. It is among the companies that approve of carbon tax.
More attention has been drawn to removing carbon from the atmosphere. There are a variety of methods toward that, including nature-based ones, like planting trees, and technological ones, like capturing carbon directly from the air.
“Microsoft will initially focus on nature-based methods like restoring degraded forests and planting new trees, ”said Lucas Joppa, the company's Chief Environmental Officer. An investment of one billion dollars will also be provided for the development of carbon removal and reduction technology. Microsoft's decision of counting its supply chain's emissions is an extension of its previous commitment to run data centers mainly on the renewable energy.
The company's intention to promote low-carbon policies was highly recognized by environmentalist. “A company's most powerful tool for fighting climate change is its political influence, and we're eager to see Microsoft use it, ”Elizabeth Sturcken, Managing Director of EDF+Business said.
Other industries are also encouraged to follow Microsoft's example. But none of them has such a commitment, according to Gary Cook, senior analyst of Greenpeace. Nevertheless, Cook, together with some other environmentalists, criticized Microsoft for continuously cooperating with oil and gas companies. Amazon's AWS service has faced the same criticism for working with fossil fuel clients.“There's a real disconnection between what they're doing within their own company and their empowering of dirty energy, ” Cook said.
1. What do we know about Microsoft In its “carbon negative” commitment?| A．It will reduce its carbon emissions to almost zero. |
| B．It will remove all the carbon from the environment. |
| C．It plans to clean up its previously released carbon. |
| D．It plans to include its clients in its future campaign. |
| A．Collecting carbon tax | B．Capturing carbon from the air |
| C．Exploring renewable resources | D．Funding carbon reduction technology |
| A．They criticize it for its unrealistic promise. |
| B．They think highly of it for its political influence. |
| C．They praise it for its push for low-carbon policies |
| D．They speak ill of it for its partnership with Amazon. |
| A．Health. | B．Politics | C．Technology. | D．Environment. |
【推荐1】To describe the sorrow of bookstores is to join the dirge-singing chorus. Everyone knows the tune: sales at bookstores have fallen because buyers are ordering books online or downloading them to e-readers. Bookstores may be great places to browse and linger, but online is where the deals are. In the latest chapter in the Borders legend, the bookstore chain has agreed to sell its assets（资产）for $215m to Direct Brands, a media-distribution company owned by Najafi, a private-equity firm, which would also assume an additional $220m in liabilities（债务）. This will serve as the opening bid for the company’s bankruptcy-court auction（拍卖），scheduled for July 19th.
Whatever happens at the auction will decide the fate of the bookseller, which has already closed more than a third of its stores. Because Direct Brands is an online and catalogue-based distributor of music. DVDs and books, some think that a deal with Najafi will do little to keep the remaining bookstores open. Rather, the company will probably see value in the Borders distribution network and liquidate（清算）almost everything else. Regardless, the story doesn’t look good for store employees and their shrinking customers.（The company, which employs more than 11,000 people, has racked up more than $191m in losses since seeking bankruptcy protection in February, according to the Wall Street Journal.）
Nashville, Tennessee, is still facing several bookstore closings, including a Borders and the more beloved Davis-Kidd. The result, as reported in the Nashville Scene, is an“object lesson in how truly awful it is to live in a town where used bookstores and the pitiful offerings of Books-a-Million are all we have.”The problem, however, is that no one seems willing to buy full-price books anymore. Campaigns to get people to buy books from their local bookstores—such as“Save Bookstores Day”on June 25th—miss the point. While there is a demand for real bcicks-and-mortar places to gather, drink coffee and read new books, such places can’t exist if the market can’t accommodate them.
Besides coffee, access to Wi-Fi and yoga mat, what will people pay for to enable a bricks-and-mortar bookstore? Could independent stores charge membership fees, which grant access to books at slightly lower prices? Would a corporate-sponsorship model work? Perhaps bookstores could become tax-subsidized（补贴税收的）places where people can browse and linger, but only borrow the books for limited periods of time—what the hell, let’s call them libraries.
At any rate, the market is squeezing out a meaningful public space. It will be interesting to see what fills the void（真空）these bookstores leave behind.
1. According to Paragraph 1, Borders went bankruptcy because ______.| A．its bookstores are not cozy enough to stay |
| B．a media-distribution company has purchased it |
| C．customers tend to buy books online or read e-books |
| D．online bookstores have totally replaced it |
| A．people in Nashville have protested against bookstore closings |
| B．the campaign to save bookstores did have some effect |
| C．people’s reluctance to buy full-price books is a reason for bookstore closings |
| D．people in Nashville feel indifferent to the bookstore closings |
| A．Local business and government should help out. |
| B．There is no proper and feasible method by now. |
| C．Bookstores should learn management from libraries. |
| D．Bookstores should enlarge entertainment places. |
| A．Goodbye to Bookstores |
| B．Online Reading or Buying Books from Bookstores? |
| C．The Bankruptcy of Borders |
| D．How to Save Bookstores from Closing? |
【推荐2】China’s Tianwen 1 Mars probe (探测器) conducted its fourth orbital correction on Friday evening, as the spacecraft makes ready for its arrival in orbit around Feb. 10, according to the China National Space Administration.
The name comes from the long poem Tianwen, meaning Heavenly Questions or Questions to Heaven, written by Qu Yuan, one of the greatest poets of ancient China. In Tianwen, this name conveys the Chinese nation’s steady effort in pursuing truth and culture of exploring nature and the universe. CNSA also unveiled ( 发 布 ) the logo of China’s planetary exploration missions, featuring the letter C, signifying China, international cooperation and capacity of entering space.
Tianwen I has flown for 197 days and more than 465 million kilometers on its journey to the planet. It is now around 184 million km from Earth and I. 1 million km from Mars. Depending on the two planets’ orbits, Mars is between 55 and 400 million km from Earth. Mars probe Tianwen I is seen in its first selfies in space on Oct. 1, 2020. The administration also published a black-and-white picture of Mars taken by Tianwen I, the first snapshot (抓拍的照片) from the Chinese craft.
Tianwen I, the country’s first independent Mars mission, was launched by a Long March 5 heavy-lift carrier rocket on July 23 from the Wenchang Space Launch Center in Hainan province, kicking off the nation’s planetary exploration program.
A successful landing would make China only the second nation to place a spacecraft on the Martian planet. China would also be the first to successfully orbit, land and deploy ( 部署) a vehicle in the same mission. According to experts, searching for signs of life on Mars will be the first and foremost scientific goal. China is open and inclusive in the development of its space technology not least because it believes that the exploration of outer space should help build a community with a shared future for mankind.
1. Why is Qu Yuan’s poem mentioned in the text?| A．To tell the origin of space exploration. |
| B．To describe space exploration vividly. |
| C．To highlight the importance of space exploration. |
| D．To show Chinese continuous struggle in space exploration. |
| A．function | B．development | C．operation | D．structure |
| A．To build a common future for man. | B．To prove our achievement in space research. |
| C．To discover signs of life on this planet. | D．To expand the understanding of the space. |
| A．Letter C Logo symbolizes creation between countries. |
| B．China was the first nation to land a spacecraft on Mars. |
| C．Tianwen I made its fifth orbital correction around Feb. 10. |
| D．Tianwen I started a new chapter in Chinese planetary exploration. |
【推荐3】Composite image of Europe and North Africa at night, 2016. Credit： NASA Earth NPP Observatory images by Joshua Stevens, using Suomi VIIRS data from Miguel Roman, is oftenNASA's Goddard Space Flight Center. Artificial light seen as a sign of progress: the march of civilization shines a light in the dark； it takes back the night； it illuminates. But a chorus of scientists and advocates argues that unnaturally bright nights are bad not just for astronomers but also for nocturnal (夜间活动的)animals and even for human health.
Now research shows the night is getting even brighter. From 2012 to 2016 the earth's artificially lit area expanded by an estimated 2. 2 percent a year (map), according to a study published last November in Science Advances. Even that increase may understate the problem, however. The measurement excludes light from most of the energy-efficient LED lamps that have been replacing sodium-vapor technology in cities all over the world, says lead study author Christopher Kyba, a postdoctoral researcher at the German Research Center for Geosciences in Potsdam.
The new data came from a NASA satellite instrument called the Visible Infrared Imaging Radiometer Suite (VIIRS). It can measure long-wavelengths of light, such as those produced by traditional yellow-and-orange sodium-vapor street lamps. But VIIRS cannot see the shortwavelength blue light produced by white LEDs. This light has been shown to disrupt human sleep cycles and nocturnal animals, behavior.
Credit: Mapping Specialists ； Source: Artificially Lit Surface of Earth at Night Increasing in Radiance and Extent," by Christopher C. M. Kyba et al. , in Science Advances, Vol. 3, No. 11, Article No. E1701528 ； November 22, 2017.
The team believes the ongoing switch to LEDs caused already bright countries such as Italy, the Netherlands, Spain and the U. S. to register as having stable levels of illumination in the VIIRS data. In contrast, most nations in South America, Africa and Asia brightened, suggesting increases in the use of traditional lighting. Australia actually appeared to lose lit area一but the researchers say that is because wildfires skewed the data.
"The fact that VIIRS finds an increase (in many countries) , despite its blindness in the part of the spectrum that increased more, is very sad," says FabioFalchi, a researcher at Italy's Light Pollution Science and Technology Institute, who did not participate in the study. In 2016 Falchi, along with Kyba and several other members of his research team, published a global atlas of artificial lighting that showed one third of the world's population currently lives under skies too bright to see the Milky Way at night.
The data also cast doubt on the idea that the LED lighting revolution will lead to energy cost savings. Between 2012 and 2016 the median nation pumped out 15 percent more long- wavelength light as its GDP increased by 13 percent. And overall, countries, total light production correlated with their GDP. In other words, Kyba says, "we buy as much light as we are willing to spend money on."
1. Which is not true about the spread of lit areas?| A．Lit area expanded by an estimated 2. 2 percent a year. |
| B．Artificial light is often seen as a sign of progress. |
| C．The increase in GDP is due to the increase in light. |
| D．It is bad for noctumal animals and even for human health. |
| A．It is a kind of NASA satellite device. |
| B．It can record and analyzed long-wavelength light. |
| C．The blue light generated by white LEDs can disrupt human sleep cycles. |
| D．VIIRS has found an increase of traditional lighting in lots of nations. |
| A．Artificial LED lights at nights are harmful to people's health. |
| B．It is a sign of civilization in modern society. |
| C．The blue light disrupts human and animals" life cycles. |
| D．Artificially lit surface of Earth increasing because of LEDs. |
| A．show the VIIRS data from NASA |
| B．demonstrate the significance of VIIRS for its measurement of wavelengths |
| C．reveal the relationship between wavelength light and GDP |
| D．arouse peoples awareness of light pollution |
