Scientists have designed “transparent wood” that could replace conventional glass in windows. The innovation was developed using wood from the balsa tree, which is native to South and Central America, and claims to be five times more thermally efficient than glass.
The team treated balsa wood in an oxidizing bath (氧化池) that bleaches (漂白) it of nearly all visibility and then poured it into a synthetic polymer (合成物) called polyvinyl alcohol (PVA 聚乙烯醇), creating a product that is virtually transparent.
Unlike traditional glass, the transparent wood can bear much stronger impacts and will bend or separate when damaged, instead of being destroyed into tiny pieces.
The transparent wood was created by teams at the University of Maryland and University of Colorado, which set out to find a greener alternative to conventional glass—a production that creates 25,000 tons in emissions each year.
Along with contributing to greenhouse gases, glass contributes to a loss of energy.
“Residential building windows in particular account for 10-25% of the heat loss due to their poor thermal (保热的) management capability,” the team wrote in the study.
“Exploring energy efficient window materials is thus highly desirable to address heating costs, energy shortages, and the global impact of climate change associated with increased carbon emissions.”
The team notes that the bonding between PVA and cellulose (纤维素) in the wood, creates a tightly packed structure that allows for more thermal protection and makes it more durable and lighter than glass.
“Switching to transparent wood could prove to be cost efficient as well,” researchers shared in a statement.
“It is approximately five times more thermally efficient than glass, cutting energy costs.”
“It is made from a sustainable, renewable resource with low carbon emissions. It’s also compatible (兼容的;可共存的) with existing industrial processing equipment, making the transition (过渡) into manufacturing an easy process.”
1. How many key steps are to take to make balsa wood transparent based on the passage?A.One. | B.Two. | C.Three. | D.Four. |
① being more thermally efficient
② bearing much stronger impacts
③ breaking into tiny pieces when damaged
④ cutting energy costs
⑤ contributing to a loss of energy
⑥ being more durable and lighter
A.①②③④⑥ | B.①②④⑤⑥ |
C.①②④⑥ | D.①②④⑤ |
A.They developed the transparent wood from the balsa tree native to South and Central America |
B.They set out to find a greener alternative to conventional glass because glass contributes to loss of energy. |
C.They claimed the transparent wood was five times more thermally efficient than glass. |
D.They concluded the process of producing the transparent wood is more difficult than that of producing glass. |
A.a new technology of replacing transparent wood |
B.a production of a new type of building material |
C.an innovation (改革;创新) of new residential (适于住宅的) building glass |
D.an invention of a new energy efficient window material |
相似题推荐
【推荐1】Apple’s well publicized iPhone X finally went on sale in pre-orders last week. With a starting price of $ 999, the iPhone X has the highest price of any iPhone ever offered. Yet Apple says its latest smartphone has so far been “off the charts.”
One of the most-talked about features of the iPhone X is the new Face ID recognition system, which replaces the Touch ID on other Apple devices that used a fingerprint to unlock the phone. It works by projecting more than 30, 000 dots on the face of users to create a kind of map- An infrared (红外线的) camera then reads these marks to create an image that can be confirmed as having the same appearance. Apple says the system is also designed to continually learn. Each time the face is used to unlock the phone, it is supposed to note any changes, such as facial hair or the person getting older. The system can then remember the changes to keep recognizing the person over time.
A face can unlock iPhone X, but can it be fooled?
One fairly common failure was that the Face ID sometimes did not unlock the iPhone X if the user wore a pair of sunglasses. Not surprisingly, wearing any kind of disguise (化妆) ---even one covering just part of the face—caused Face ID to fail. It was found to work correctly when the user was wearing headphones or a hat.
Several attempts were made to trick Face ID into unlocking the phone with a photo of a person instead of a real face. The iPhone X was able to pass these tests by knowing the difference between a photo and a face. Wall Street Journal reporter Joanna Stern tried something a little different. She went to a mask maker and asked for a recreation of her face to see if the iPhone X would be fooled. It was not.
Apple says its research shows there is only a one in a million chance of another person being able to unlock someone else’s iPhone X with Face ID. The company has promised the system will become “the new gold standard” for all facial recognition.
1. What does the underlined part “off the charts” in Paragraph 1 probably mean?A.far from satisfactory. | B.extremely successful. |
C.surprisingly unpopular. | D.unbelievably disappointing. |
A.It is a hot topic worth debating. |
B.It works in the same way as Touch ID. |
C.It is smart enough to continue learning. |
D.It can function well without an infrared camera. |
A.When he or she wears a hat. |
B.When he or she wears a mask. |
C.When he or she uses a photo. |
D.When he or she wears glasses. |
A.Doubtful. | B.Puzzled. |
C.Positive. | D.Pessimistic. |
【推荐2】As a senior school graduate, with COVID-19 cases rising and lockdown hitting, I’ve had plenty of concerns. Losing my graduation ceremony was one of them. But being unable to lend a hand to my community at such a terrible time was the greatest concern. Except for wearing my mask, following the health officials’ guidelines, and assisting seniors to get their groceries, there wasn’t anything more I could do.
Then it struck me. Solving COVID-19 relied only on individual steps and the goodwill of human awareness. But the next challenge we have to deal with ahead is climate change known as the silent pandemic without a vaccine. So all I could think of was: Why don’t we do the same for it, and try to deal with global warming through our everyday activities?
I have decided to take a gap year and created an app to help people reduce carbon emissions from their shopping and transport activities. Even though I’d never written any program before, my will was greater than any excuse I could think of. The first version was just a one-screen app. Through the lockdown, I’ve had only 70 people to test the concept with and barely created any impact. Plus, the process of leading a social organization seemed like a small boat in a rough sea to me. But instead of giving up, I chose to fill the gap. And the coolest thing was that the more I was learning, the more people got interested in the idea. Through every leadership program, I built a stronger user community where each person was equally passionate and brave to make a change. Their enthusiasm was my greatest fuel for innovation.
Today, through the app, over 4,000 people reduced more than 150,000 kg carbon emissions. The app turned into an international movement. I proved to myself that miracles really happen when you dare to make a change.
1. What inspired the author to create the app?A.The active involvement of thousands of users. |
B.The author’s contributions to community service. |
C.The influence of human activities on global warming. |
D.Similarities between fighting climate change and COVID-19. |
A.It is a well-designed app. |
B.It is for leading an organization. |
C.It inspires people worldwide to make changes. |
D.It became an instant hit when it was first invented. |
A.Determined and creative. | B.Brave and adventurous. |
C.Friendly and cautious. | D.Kind and humorous. |
A.Solving Covid-19 is the key to inventions. |
B.Ups and downs often lead where you belong. |
C.Creativity results from challenging the authorities. |
D.Miracles do occur if you have the courage to make a change. |
【推荐3】Google’s AlphaGo defeated the South Korean Go grandmaster Lee Sedol four games to one Artificial intelligence had suddenly reached a new and unexpected height.
But AlphaGo is no longer the best Go “player” in the world Google’s artificial intelligence group, DeepMind. has created the next generation of its Go-playing program, called AlphaGo Zero The new A1 program is unique in the way it learned to play Go Instead of learning from human matches, as its predecessor (前任) did, AlphaGo Zero mastered Go in just two days without any human knowledge of the game and defeated AlphaGo by day three, reported The Guardian It then went on to defeat AlphaGo 100 games to zero.
To learn how to play Go, AlphaGo Zero played millions of matches against itself using only the basic rules of the game to rapidly create its own knowledge of it tike the previous version, it used “reinforcement (增强) learning to become its own teacher, ”ccording to DeepMind’s website.
“It’s more powerful than previous approaches. ’’ David Silver, AlphaGo’s lead researcher, told The Guardian, “because by not using human data, or human expertise in any fashion, we’ve removed the constraints (约束) of human knowledge and it is able to create knowledge itself . ”
AlphaGo Zero’s approach to selt-learning is a significant advancement in AI could be applied to help solve some of the world s biggest problems, according a recent research report published in the journal Nature. For example, DeepMind co-founder DemisHassabis argues that AlphaGo Zero could probably find cures for a number of serious diseases within weeks, according to The Telegraph Indeed, the AI is now being used to study protein folding, which is connected to diseases such as Parkinson’s and Alzheimer’s.
So now that AI has surpassed human beings in some ways, perhaps the question is not about what AI can learn from humans, but what humans can learn from AI We can only wait and see.
1. What can we learn from the first two paragraphs?A.AlphaGo defeated Lee Sedol five games to zero |
B.AlphaGo Zero defeated AlphaGo within one day |
C.AlphaGo Zero is the first program to defeat a human at Go |
D.AlphaGo Zero has become the new best Go player |
A.It can collect human knowledge automatically |
B.It can create knowledge with human data |
C.It can become its own teacher in learning Go skills |
D.It can play many matches without a break |
A.Treating diseases. | B.Making new Go rules. |
C.Solving math problems. | D.Creating new proteins. |
A.increased | B.outdone |
C.declined | D.hidden |
【推荐1】Do you use the weekends to catch up on sleep? If so, you may want to rethink that. in young adults, using weekends to catch up for lost weekday sleep can cause health risks. The take-home message is basically that you can’t make up for lost sleep by sleeping a few more hours on weekends.
Weekends may seem like a great time to catch up on sleep. Scientists, however, weren’t sure that would work. So Christopher Depner and his colleagues decided to test it out. Depner is a sleep physiologist. He works at the University of Colorado, Boulder.
The team looked at three groups of people in their mid-20s. For roughly two weeks, each group followed a set sleep schedule. One group slept about eight hours every night. Another group only got about five hours of shut-eye a night. The third group snoozed (打盹) some five hours each weeknight, but could sleep whenever and however much they wanted over the weekend. That last group stayed up until midnight or I am on Friday and Saturday nights. The following mornings, they slept in until sometime between 11 am and noon. But they also stayed up late on Sunday. That left them only about six hours of snooze tine before the next workweek started. Over the whole weekend, these people got only about 1.1 hours more sleep than what their bodies needed, the researchers found.
People in the study who got too little sleep every night gained weight. So did the weekend sleep-in crowd. By the end of the experiment. people in both groups had gained an average of 1.5 kilograms.
Depner says this could be because losing sleep interferes with hormones that control hunger. Since weekend-catch-up sleepers both woke up later and went to bed later, they shifted (改变) their bodies’ internal clocks. As a result, they may have gotten hungry later. During the workweeks, both groups ate roughly 400 to 650 calories in late-night snacks.
1. Why did the team carry out the research?A.To help promote a healthy lifestyle. | B.To find a proper time for sleep on weekends. |
C.To make improvements for the people who stay up. | D.To find out the disadvantages of losing sleep. |
A.It can’t make up for the lost sleep. | B.People should pay much attention to it. |
C.More research is needed for the effects. | D.It is supposed to benefit those in need of sleep. |
A.They ate more than what their bodies needed. | B.Their bodies’ internal clocks were shifted. |
C.They always felt hungry on weekends. | D.They had a good appetite on weekdays. |
A.Staying up leads to weight gain. | B.Young adults should eat regularly. |
C.Sleeping in on weekends won’t work. | D.Finding new ways to sleep well is essential. |
【推荐2】If someone created a flying machine capable of tracking you down by listening for your voice, you might be terrified. But what if you were trapped in ruins after a natural disaster and first responders couldn’t locate you? Maybe then a human-seeking drone(无人机) wouldn’t be such a terrible idea. That concept is the focus for engineers at Germany’s Fraunhofer FKIE Institute, who’ve built a drone to find people by detecting(探测) human screams.
“The human-seeking drone would be ideal for post-disaster situations, such as earthquakes, hurricanes and wildfires,” said Macarena Varela, one of the lead engineers. “They could hover over an area that rescue crews have difficulty getting to and locate exactly where people may be trapped.”
Locating people by sound presents its share of challenges. An auditory(听觉的) system would need to distinguish human cries from sounds that often happen in nature, such as animal calls and wind. It might also need to recognize patterns associated with kicking, clapping or other ways people try to get the attention of rescue teams.
Engineers took those situations into account when building out their concept drone. They recorded themselves screaming, tapping and creating other noises that might be a sign of people in trouble. Then, they analyzed each sound frequency to find common signatures and used those to train artificial intelligence software. They also worked to remove the noise created by the drone and other environmental sounds.
Once the software part was complete, the team placed tiny digital microphones under the drone and used signal processing techniques that enabled them to track where human noises are coming from. The microphones also enhanced the volume and clarity of the speech. So far, they have conducted successful open field experiments, finding that the drone can estimate a victim’s location within a few seconds of picking up sound.
Next, they would like to add a higher frequency microphone to a drone to acquire more audio sound signals. The idea is to pick up noises from hundreds of meters away, Varela said. In the real world, victim’s location data might one day be sent wirelessly to emergency crews carrying a tablet.
1. What is the advantage of the human-seeking drone?A.Its high speed of flying. | B.Its long working hours. |
C.Its quick response to screams. | D.Its easy access to disaster scene. |
A.Recognize human cries. |
B.Pick up sounds from far away. |
C.Send victim’s location data to a tablet. |
D.Improve the quality of human screams. |
A.Effects. | B.Features. | C.Symbols. | D.Situations. |
A.AI Enables Drones to Give Better Performance. |
B.Human-seeking Drones Replace Rescue Crews. |
C.Rescuers Use Drones to Locate Disaster Survivors. |
D.Engineers Teach Drones to Hunt Human Screams. |
【推荐3】Neck pain is a widespread complaint in the information age, with many more of us spending a great deal of time glued to a computer, tablet or phone, or sitting in front of the TV. It’s also a common disease of aging, due to increasing wear and tear on the spine’s (脊椎) joints and tissues. At any given time, an estimated 39 percent of people over 65 have discomfort in their necks. Assuming an injury or potential disease isn’t causing the condition, here are some tips from some experts for managing the discomfort, as well as the best stiff (僵硬) neck remedies.
Sleep off a stiff neck. If you’re looking for stiff neck relief, getting a good night’s sleep — which represents roughly a third of your day — is a good place to start. Choose a relatively firm mattress (床垫) and use only enough pillows to keep your head level with the rest of your body — one is usually sufficient. For sleep that is even more neck-friendly, try lying on your back with pillow support under your knees. This will flatten and relax your spinal muscles.
When it comes to computer use, make sure the monitor is at arm’s length and eye level. Laptops have poor posture built into their designs: if the keyboard is near enough to be comfortable, then the screen is too close, and if the screen is positioned correctly, the keyboard is too far away, forcing you to bend forward. You can solve this problem by placing the device on a bunch of large books or a laptop stand and using a separate keyboard and mouse.
There is evidence to suggest home exercises may be effective against short-term neck discomfort (lasting for 12 weeks or less). “There are many possible reasons for neck pain, including stress, poor posture and organ aging,” explains Dr Michael Westaway, a musculoskeletal clinical specialist. “Treatment is often varied and may include an exercise program. For severe cases, there are painkillers, injections and surgery. However, resist the urge to immediately take aggressive measures, since simpler steps will often ease this everyday pain,” Michael Westaway warned.
1. Why do people suffer more from neck pain in the information age?A.Various stresses from work. | B.More access to the digital facility |
C.Poor diets and unhealthy eating habits. | D.Higher cost of going to see the doctor. |
A.More pillows to support your head. |
B.Less than 1/3 of your day for sleeping every day. |
C.Sleeping on your back with pillows under the knees. |
D.Selecting a relatively soft and comfortable mattress. |
A.Applications. | B.Technologies. | C.Position of the body. | D.Size of the laptops or computers. |
A.Physical exercises every day is the only way for the neck suffering. |
B.Painkiller is the immediate solution to neck pain. |
C.There’s no cure for severe neck pain sufferers. |
D.Simple steps of neck exercises really works. |
【推荐1】The Nutrition Company on a Special Mission
Pūratae is a socially responsible health and wellness company that was founded on the principles of helping others live a more pure, balanced life—while Pūratae is also doing something that distinguishes itself from other nutrition companies—feeding children in need around the world.
Their Pure Superblend is a supplement powder designed to be taken in the morning. Designed to help balance the body in every area, it provides:
—14 supplements that not only provide your essential vitamins and minerals, but also support a healthy gut (肠道) and increase and stabilize the natural energy of the body.
—10 grams of plant and vegetable based protein to stabilize the blood sugar and maintain lean mass.
—And, it's natural, allergen-free, and PURE—free of artificial colors, flavors, preservatives and sweeteners.
At $ 3.00 per day, retail, they are also committed to making it affordable. When using the discount code for 15% off, it drops to $ 2.50 per day when you buy your monthly supply.
With every Pure Superblend purchased, the company provides 10 meals to children in need. Pūratae currently has a giving outreach in 20 countries (including the US and Canada) and provides over 1,000 meals a day to children in need.
1. What is special about the Pūratae company?A.Its products are natural and pure. |
B.It provides meals to kids in need. |
C.It helps consumers live a balanced life. |
D.Its products contain essential minerals. |
A.About $ 45. | B.About $ 10. |
C.About $ 90. | D.About $ 75. |
A.To comment. | B.To advertise. |
C.To offer tips. | D.To entertain readers. |
【推荐2】PENRICE
COMMUNITY COLLEGE
Cornwall County Counicl
We Need Two
ASSISANT HEADTEACHERS
From January 2006
L13—17(£44,703—£49,314)
Penrice Community College is a highly regarded and successful 11-16 specialist languages college. Following the recent appointment of a new headteacher we’re restructuring the leadership team to create two new roles.
One post will involve leading teaching teams with responsibility for developing curricula(课程) and time-tabling.
The other post will be leading student based teams and responsibility for student learing outcomes and the removal of barriers to student success such as poor attendance or disaffection.
Penrice Community College is:
A school with 1,350 wonderful students
High achieving with results well above average
Mentioned twice in HMCl’s outstanding schools list
A British Council International School
Situated in a beautiful part of mid-Cornwall
All enquires for information and application packs should be made to Danielle Eyres on 01726—72613 or at secretary@penricornmvall .sch.uk
Closing date for applications is Tuesday October 4th at noon. Interviews will be held on Monday 17th and Tuesday 18th October 2015.
1. The underlined word “restructuring’ probably means ________.A.formally telling sb to do | B.Joining the two parts together |
C.rebuilding sth and making it work again | D.extending the size of sth |
A.introduce the advantages of a school | B.report the appointment of a new head teacher |
C.call on more students to go to school | D.advertise for new assistant headteachers |
A.stop students missing classes | B.get students interested in learning |
C.lead students-based teams | D.arrange new curricula |
A.an educational organization | B.a school leader |
C.a political party | D.a news reporter |
【推荐3】Ever since the beginning of human civilization, we are trying to reduce manual efforts by making simple to extremely complex machines. The next step in the same process is robotics and automation. Robotics and automation is a field with abundant potential. It expands its scope from household applications to solving mysteries of the Universe to curing untreatable medical conditions.
Up until the beginning of 2020, robots of any kind are made up of nor-living materials. Recently scientists from the University of Vermont & Tufts University introduced Xenobots, which have opened a whole new Universe for this field. Xenobots are the world’s first living and self-healing microbots. These robots are designed with the help of computer-generated- evolutionary algorithm(算法). The living cells used for its creation are skin, heart and stem cell from the African frog embryos(胚胎).
These microbots are very basic in nature, made up entirely from the organic substance. They can move forward, turn around, spin in circles and flip over. They are smaller than a millimetre and can travel inside the human body. Just imagine the possibilities we will have, once scientist is able to teach Xenobots to do the desired task. One day they even might be able to fight cancer cells. They will be able to clear microplastics in the oceans and lots more.
But if these bots are a life form, why are we calling them robots? This is because scientists are designing them to move or work according to their wills. A certain arrangement for skin and heart cells in an Xenobot will make it move in a straight line, while a different arrangement of the same cells will be required to move them in circular motions.
Xenobots are positively a great step. Scientists are also calling them a brand new life form on the planet. The future is unseen but is undoubtedly full of countless possibilities.
1. Which of the following is the potential of the robotics?A.Making complex machines. | B.Reducing manual efforts. |
C.Expanding our scopes. | D.Clearing space mysteries. |
A.In nature. | B.In size. | C.In movement. | D.In materials. |
A.Travel inside the human body. | B.Create new life. |
C.Fight cancer cells. | D.Clear microplastics in the oceans. |
A.Doubtful. | B.Positive. | C.Ambiguous. | D.Disapproving. |
【推荐1】On November 27, 2020, two giant pandas, “Da Mao” and “Er Shun,” arrived in Chengdu, capital of Sichuan province, after finishing their stay at a Canadian zoo ahead of schedule, as the COVID-19 pandemic made their bamboo supply difficult to continue.
The two pandas were shipped from China to Canada on March 25, 2013. The original plan was that the two, Da Mao, a 4-year-old male from the Chengdu Research Base of Giant Panda Breeding in Sichuan, and Er Shun, a 5-year-old female from Chongqing Zoo, would stay in Canada for 10 years under a conservation agreement between the two countries, the first five years at Toronto Zoo followed immediately by another five years at Calgary Zoo.
At present, “Da Mao” and “Er Shun” have been sent to Chongqing Municipality for quarantine, according to the Chengdu Research Base of Giant Panda Breeding.
As we know, on average, each giant panda consumes about 40 kilograms of bamboo daily. The Calgary Zoo had been importing fresh bamboo from China because of the climate in Canada, but struggled to meet the pandas needs when the coronavirus grounded most flights in March.
The zoo said staff worked with the San Diego Zoo and Suncoast Nursery to arrange weekly shipments of fresh bamboo, but the process of finding the right bamboo has been expensive and time-consuming.
In May, the zoo announced it would have to return the two animals earlier than planned so that they could enjoy China’s abundant supply of fresh bamboo instead.
The zoo said on Friday that after months and months of hard work it had secured international permits to get their beloved pandas home to China.
Throughout their trip home, each panda has about 100 kilograms of bamboo to consume along with pears, apples and biscuits.
After spending five years at the Toronto Zoo, the two moved to the Calgary Zoo in March 2018 with twin babies, “Jia Panpan” and “Jia Yueyue,” which had traveled home to China in January.
Times Nov.30, 2020
1. How many years earlier did the two pandas return to China?A.More than two years | B.Less than two years |
C.About four years | D.More than three years |
A.the two giant pandas come from China | B.Canada wanted to be grateful for China |
C.pandas eat nothing but bamboo from China | D.the climate in Canada is unfit for bamboo to grow |
A.being based on something | B.stopping a child from going out |
C.connecting something to the ground | D.preventing the flights from taking off |
A.The two giant pandas are both 12 years old now. |
B.Throughout their trip home, the two pandas only ate bamboo. |
C.The two pandas’ twin babies came back to China earlier than them. |
D.The two pandas are from the same Chinese zoo and stayed together in Canada. |
【推荐2】The UK has a wellrespected higher education system and some of the top universities and research instructions in the world.But to those who are new to it all,sometimes it can be confusing.
October is usually the busiest month in the college calendar.Universities have something called Freshers’ Week for their newcomers.It’s a great opportunity to make new friends,join lots of clubs and settle into university life.
However,having just left the comfort of home and all your friends behind,the prospect(前景) of meeting lots of strangers in big halls can be nervewracking(令人焦虑不安的).Where do you start?Who should you make friends with?Which clubs should you join?
Luckily,there will be thousands of others in the same boat as you worrying about starting their university social life on the right foot.So just take it all in slowly.Don’t rush into anything that you’ll regret for the next three years.
Here is some top advice from past students on how to survive Freshers’ Week:
•Learn rules.Make sure you know British social etiquette(礼节).Have a few wine glasses and snacks handy for your housemates and friends.
•Be kind.Sometimes cups of tea or even slices of toast can give you a head start in making friends.
•Be sociable.The more active you are,the more likely you’ll be to meet new people than if you’re someone who never leaves his room.
•Bring a doorstop.Keep your door open when you’re in and that sends positive messages to your neighbors that you’re friendly.
So with a bit of clever planning and effort,Freshers’ Week can give you a great start to your university life and soon yon’ll be passing on your experience to next year’s new recruits.
1. Which of the following statements is NOT true according to the passage?A.October is generally the busiest month for universities. |
B.It’s a good idea to put a doorstop in your door. |
C.A bit of planning can make Freshers’ Week easier. |
D.The first week of your every year at university is called Freshers’ Week. |
A.courses | B.freshers |
C.neighbors | D.challenges |
A.the newcomers usually miss the days living at home |
B.most of the students in the UK spend three years in universities |
C.many freshers are worried about how to fit university life |
D.all the new students will make new friends and join certain clubs |
A.tell the newcomers how to make a new start in universities |
B.introduce something about higher education system of the UK |
C.discuss something about the Freshers’ Week in the UK |
D.advise the freshmen how to behave well in the beginning |
【推荐3】The victims were carried in one by one, their paws and fur burned, suffering from dehydration(脱水) and fear. Their caretakers bandaged their wounds, wrapped them and laid them in baskets with the only thing that was familiar -- the leaves of a eucalyptus (桉树) tree.
As catastrophic fires have burned more than two million acres in Australia, dozens of koalas have been rescued from burning trees and ashen ground. The animals, already threatened as a species before these latest fires destroyed an essential habitat, are being treated in rescue centers, and at least one private home, along the country’ s east coast.
The difficult situation of the koala—a national symbol of Australia—has raised questions among conservationists and scientists about what it will take to preserve biodiversity in a country increasingly exposed to intense fire, extreme heat and water scarcity, and which already has among the highest rates of species extinction in the world.
While koalas have evolved to exist alongside wildfires, the animals are facing new threats not just from climate change but also from human development, which has dislocated local populations, damaging their ability to survive fires. In some regions, scientists say, koalas’ numbers have declined by up to 80 percent, though it is difficult to know how many remain across Australia.
“We have these unique animals not found anywhere else on this planet, and we’re killing them,” said Cheyne Flanagan, the clinical director of the Koala Hospital, the only facility of its kind in the world. “This is a big wake-up call.”
1. What happened to koalas after the catastrophic fires in Australia?A.The koalas were taken good care of after being rescued. |
B.Most of koalas have been rescued from burning trees. |
C.The victims only suffered from severe burns and a lack of water. |
D.Koalas have been listed among the highest rates of species extinction. |
A.illegal hunting. | B.fires in the wild. |
C.human development. | D.climate change. |
A.negative. | B.supportive. | C.indifferent. | D.worried. |
A.Climate Changes --- A Big Wake-up Call | B.Koala --- A National Symbol of Australia |
C.Catastrophic Wildfires Burning in Australia | D.Saving the Fire Victims Who Cannot Flee |