The world has just endured its hottest year on record, with global average temperatures
China, the world's largest developing country and a responsible major country,
Because of global warming, extreme weather events are increasing in frequency and intensity. Building
2 . One of the things that make humans mammals (哺乳动物) is that we’re warm-blooded — our bodies have high metabolism (新陈代谢) that maintains our internal temperature independent of the surroundings, unlike cold-blooded animals that have to lie in the sun for heat. Among modern animals, only mammals and birds are warm-blooded and our ability to keep ourselves warm has enabled us to survive in icy weather and make long migrations. But it’s been a mystery exactly when mammals evolved their high metabolism. In a new study, scientists point to an unlikely source for determining when ancient mammal ancestors became warm-blooded.
The ears of all living creatures that have backbones contain tiny canals (管道) filled with fluid that helps us balance. The runniness (流动性) of that fluid changes based on temperature, and our inner ears have evolved different sizes so that the fluid can flow correctly. Cold-blooded animals’ ear fluid is cooler and thicker, so it needs wider spaces to travel through, while warm-blooded animals have runnier ear fluid, so our canals are different.
“Canals were generally used to predict the movement of fossil organisms. However, by carefully looking at their biomechanics (生物力学) , we figured that we could also use them to infer body temperature,” says Romain David, one of the study’s lead authors. “This is because, like honey, the fluid inside canals gets runnier when temperature increases, impacting function. Therefore, during the transition to endothermy (温血性) , physical adaptation was required to keep best performances, and we could track ear canals in mammal ancestors. ”
To track these evolutionary changes, the researchers compared the sizes of the inner ear canals of over 300 animals, including 243 living species and 64 extinct ones. They found that mammal ancestors didn’t develop the kinds of inner ear structures ideal for warm-blooded animals until 233 million years ago.
The origin of mammalian endothermy is one of the great mysteries to be solved. Many different approaches have been used to try to predict when it first evolved, but they have often given unclear or conflicting results. This method shows real promise because it has been confirmed using a very large number of modern species.
1. Which of the following might be the key to mammals’ long migrations?| A．The large body size. | B．The rich food resources. |
| C．The warm-bloodedness. | D．The adaptability to surroundings. |
| A．They have much bigger backbones. |
| B．Their inner ear canals are relatively narrow. |
| C．They are much more sensitive to outside sounds. |
| D．Their ear fluid seldom changes with temperature. |
| A．Theories on the evolution of mammal ancestors. |
| B．The reason for studying the inner ears of mammals. |
| C．The importance of physical adaptation to mammals. |
| D．Possible ways to predict the movement of fossil organisms. |
| A．Appreciative. | B．Doubtful. | C．Negative. | D．Unconcerned. |
3 . In a small tea shop located in Bisalpur, Uttar Pradesh, one can spot unique furniture like stools (凳子) and tables made of bricks and recycled plastic. Other than customers, tourists who come to visit the nearby Jawai Dam often stop by here to hand plastic waste over to the shopkeeper. Run by Kana Ram Mewada, the shop not only sells tea and snacks, but also leads a campaign to reduce the use of single-use plastic in the village.
According to a report of the Central Pollution Control Board (CPCB) in 2019—2020, 3. 5million metric tons (公吨) of plastic waste is annually generated in India, and will remain in landfills (垃圾填埋场) for the upcoming hundreds of years.
Kana was deeply disturbed after reading that report on the Internet and began thinking about ways to raise the villagers’ awareness and make his village free of plastic.
He started a campaign by collecting plastic waste from his own shop and roadside. Whenever customers came, he explained the campaign. In order to attract more people, he started giving something in return for the waste they brought. Sometimes, he purchased a few things made of recycled waste to show the villagers and told them they were created from their plastic waste contribution. He also made decorative items out of the waste and placed them around the shop.
As a result, people from the village became curious about his campaign. Even tourists began participating in the exchange. And today, the forest, rivers and public spaces that were once filled with plastic waste are cleaner than before.
He hopes that he can also help the neighboring villages recycle plastic waste and make the whole area plastic-free. “When an ordinary person like me decided to start a cause, it was inspiring that a whole village stood by me and supported me. We can all become torchbearers (启蒙者) for a better tomorrow. What we have to do is take a step forward,” he said.
1. What led Kana to start the campaign?| A．An online report. | B．Tourists’ behavior. |
| C．Customers’ advice. | D．His visit to landfills. |
| A．To get more people to join his campaign. | B．To teach shoppers how to make them. |
| C．To make his shop much more beautiful. | D．To advertise the goods in his shop. |
| A．Considerate and proud. | B．Ambitious and generous. |
| C．Responsible and creative. | D．Determined and humorous. |
| A．A shopkeeper’s path to success. | B．A historic tourist spot in Bisalpur. |
| C．A unique way of turning waste into art. | D．A shopkeeper’s campaign for plastic recycling. |
4 . Watford and her family have lived in Curtis Bay, Baltimore for generations. Her community has faced environmental injustice. Heavy industries continued to move in her community. As a result, her neighbors have had to live with serious respiratory (呼吸的) problems.
When she knew a plan to build the nation’s largest trash-burning incinerator (焚化炉) less than a mile away from her high school, she realized she had to take action. The incinerator was being sold wrongly as clean, renewable energy equipment but actually it would be a source of brain-damaging chemicals and would release 200 million tons of greenhouse gases per year, both worse than coal burning. Watford felt she had a responsibility to warn her community to work together to shut this plant down.
She co-founded Free Your Voice (FYV), a 10-person student organization devoted to community rights and social justice. Together, they decided to start a campaign to take down Energy Answers, the incinerator’s developer. They went door-to-door talking to neighbors and organizing protests.
When it was discovered that Baltimore City Public Schools (BCPS) was going to be a customer of Energy Answers, the organization fought with the board and presented their case, urging BCPS to withdraw from the project. BCPS was convinced to cancel their contract, which in turn inspired 22 other customers to do the same. Without any financial gain, Energy Answers had no market to move forward with its plan.
Watford continues to work with Curtis Bay residents toward fair development. They have a vision for the future which includes building a zero-waste movement, a solar farm, and green jobs. She wants the entire human family to join the fight for environmental justice because survival as a species depends on our ability to take action.
1. What caused respiratory problems in Watford’s community?| A．Poor medical care. | B．Terrible environmental conditions. |
| C．Constant bacterial infection. | D．Unbalanced distribution of resources. |
| A．Unfavourable. | B．Doubtful. | C．Unclear. | D．Indifferent. |
| A．BCPS lost financial support. | B．Energy Answers stopped its plan. |
| C．The investors found new market. | D．Many customers revised their contracts. |
| A．A teenage hero against urban pollution |
| B．A teenage hero fighting for an advanced city |
| C．A battle for Baltimore’s sky by a teenage hero |
| D．The social justice challenge for a teenage hero |
5 . In South Africa, the African Penguin Nest Project team made up of researchers and wildlife protectors from around the world has designed handmade ceramic (陶瓷的) nest boxes over the last five years to protect endangered penguins from the warming weather caused by climate change.
In the past, the seabirds laid their eggs in holes dug into centuries old layers of their own waste. But in the late 1800s, most of the waste was collected as plant food by traders. Since then, many penguins have nested in the open, exposing them to heatstroke and their eggs to their enemies. “We have put this species at risk of extinction, mainly because of human desires,” said Shaun Welman, a zoologist at Nelson Mandela University. The population of these seabirds in Africa has fallen from 3 million to 48,000 since 1900, according to reports.
But thanks to the team, more than 1,500 ceramic nests have been made and placed across five different penguin colonies (群落) in South Africa. The structures are able to stand up to higher temperatures than traditional holes and outperformed cement (水泥) and fiberglass models, according to a study co-authored by Welman.
The ceramic nests are built by hand. The 72-hour process requires a high level of attention to details to make sure the raw materials are combined successfully. A number of air holes designed to give out heat and keep penguins cool are drilled into the top of the nests, says Kevin Graham, leader of the African Penguin Nest Project.
Having spent three years researching and testing the nests, Graham placed the first 200 structures in two South African penguin colonies in 2018. Within the first month, researchers discovered eggs in 40%of the nests in one colony and 25%of the nests in the other.
“If everything goes well and these nests continue to work, we can keep giving them homes,” said Graham. “Each one we build is eco-friendly.” He added, “We can’t solve the population decline with just the nests, but at least we can give them a place to raise kids.”
1. What led to the fall in penguins’ population at first?| A．Sea pollution. | B．Human activity. |
| C．Climate change. | D．Introduced pests. |
| A．They are easier to build and repair. |
| B．They are more environmentally friendly. |
| C．They can better protect penguins from the heat. |
| D．They can better stop the eggs from being attacked. |
| A．The ceramic nests are effective. |
| B．The penguins’ eggs are hard to find. |
| C．The ceramic nests need improvements. |
| D．The two colonies have different living habits. |
| A．To offer suggestions on wildlife protection. |
| B．To find out the threats African penguins face. |
| C．To show the achievements of an African project team. |
| D．To introduce a handmade nest benefiting penguins. |
6 . Mark Covington, founder of the Georgia Street Community Collective in Detroit, stands in a corner of his urban farm, breathing the fresh air in the early morning.
In 2007, Covington lost his job and returned to his childhood street.
Covington started with a small community garden.
| A．But if he planted stuff, they might not. |
| B．It’s a typical morning scene at the collective. |
| C．He saw garbage piled high in vacant, abandoned lots. |
| D．Covington made the garden a little bigger to plant more. |
| E．And almost immediately neighbors began asking to participate. |
| F．He planted a garden to help feed residents and enrich their lives. |
| G．What began as an effort to remove trash has turned into a site of community. |
7 . The world’s nations have promised to limit global temperature increases to 1.5 degrees over pre-industrial levels, which involves shutting down fossil fuel extraction (化石燃料开采) as quickly as possible. But despite this promise, first reached six years ago during the Paris Climate Accords, the fossil-fuel producing nations are on track to extract more than twice as much coal, oil and natural gas as would be permissible under this plan, a new United Nations report says.
To have a chance of limiting temperature increases to 1.5 degrees, production of coal needs to drop by 11% every year between 2020 and 2030. while production of oil and gas needs to drop by 4% and 3%, respectively, the report finds. Instead, production of oil and gas is set to increase, while coal production is projected to drop slightly.
The so-called production gap, the difference between countries’ climate promises and their fossil fuel production plans — hasn’t changed since the United Nations first examined it in 2019, indicating that international climate accords are still closer to theoretical promises than detailed plans.
The report looks at fossil fuel production in 15 countries — including Australia, Brazil, Canada, India, the U.S. and the United Kingdom — hat are collectively responsible for three-quarters of the world’s fossil fuel production. Most of these countries have promised to reach zero emissions by mid-century, but they are planning to increase their fossil fuel extraction until at least 2030.
So far, climate efforts from major fossil fuel extractors, including industry, have “focused on extracting fossil fuels in less-polluting ways, not on winding down production levels in line with climate goals,” the report says. While these efforts, such as developing carbon-capture (碳捕捉) technology and reducing methane leaks (甲烷泄露) are important. they fall far short of the changes science demands if global temperatures are to stay at a livable level.
To close that gap, the report urges governments to make realistic plans for winding down fossil fuel extraction, starting with state-owned companies, which arc responsible for more than half the world’s extraction of such fuels.
1. What does the new United Nations report say?| A．Climate promises are being made worldwide. |
| B．Fossil fuels arc being extracted in large quantities. |
| C．Global temperature will soon increase by 1.5 degrees. |
| D．Production of coal will drop sharply in the next decade. |
| A．To imply an energy crisis. |
| B．To show the efforts made by now. |
| C．To indicate how to close the production gap. |
| D．To stress the goal of the Paris Climate Accords. |
| A．They will achieve zero emissions by 2030. |
| B．They think little of carbon-capture technology. |
| C．They should turn to the United Nations for help. |
| D．They are on the way to breaking their promises. |
| A．Coal mines owned by the government. | B．Gas stations run by private companies. |
| C．Power plants owned by the government. | D．Car factories run by private companies. |
Puppies that mainly eat dog food are more likely to have problems with their gut (下消化道) health in later life compared with those
Anna Hielm-Björkman at
The researchers surveyed each dog owner multiple times in this period and also asked them whether their dog
The team wanted to determine the effect that a dog’s diet at an early age had
The researchers found that 22 per cent of dogs developed CE in adulthood,
Their diet as a puppy, aged between 2 months and 6 months,
9 . A solar tree is a structure like a tree that generates solar energy using photovoltaic panels (太阳能光伏板). It helps solve an urgent global challenge: Replacing greenhouse gas-emitting energy sources like oil and gas with renewable energy. But the power generation potential of solar trees is relatively limited, and their primary purpose is to raise public awareness about renewable energy by getting people to notice and interact with solar energy in new ways.
Solar trees generally have a firm metal, plastic, or stone base that extends up and out into “branches” on which solar panels are mounted. Beyond this basic structure, there is great diversity in the design of solar tree units. The solar tree’s photovoltaic “leaves” absorb sunlight, converting it into electricity that is conducted down through the trunk-like central pillar of the structure to an inside battery. Many designs feature rotating (旋转的) panels that can move throughout the day in order to obtain the greatest amount of sunlight.
Solar trees help power homes, businesses, and public services. They can create shade to help reduce the urban heat island effect and provide shelter in severe weather such as rainstorms and heatwaves, creating greater urban adapting ability in the face of climate change. They also enhance public spaces, providing charging stations, and powering streetlights.
In comparison to other kinds of ground-mounted solar panel devices, solar trees don’t require much land. They make solar energy generation possible in areas with little land that can’t support vast solar arrays, as well as places that lack sufficient rooftop space for panels. However, solar panels are much cheaper than solar trees at present and have far greater energy generation capacity. Therefore, present solar tree designs often serve as a extra source rather than as a primary energy source.
At present, solar trees aren’t designed as large-scale solar projects, which limits their ability to contribute to the low-carbon energy transition. Still, their varied designs are appealing. This makes solar trees effective at displaying and thereby educating people about solar energy, and promoting a business or organization’s commitment to renewable energy.
1. What is the main purpose of building solar trees?| A．To beautify the urban environment. | B．To draw public attention to solar energy. |
| C．To replace non-renewable energy resources. | D．To provide charging services in emergencies. |
| A．It stores energy in its own battery. |
| B．It can adjust its height automatically. |
| C．It is made of environmentally friendly materials. |
| D．It transforms sunlight into electricity by its metal base. |
| A．The design features of solar trees. | B．The ways of saving energy in cities. |
| C．The benefits of solar trees to humans. | D．The difficulties of promoting solar trees. |
| A．They occupy much less land. | B．They are cheaper to manufacture. |
| C．They are more effective in generating energy. | D．They can work in various weather conditions. |
10 . A new form of real estate(不动产)is appearing along the beaches of South Africa and on the dry islands off its coast-tiny white beach huts. With good ventilation and a sea view, they are just big enough to fit a family of African penguins. Their unique selling point: a safe and cool place for penguins to breed.
African penguins, unlike their relatives that live in snow and ice, live well in the cold currents of the South Atlantic Ocean. But when they come to land, their thick black coat absorbs the heat, and they desperately look for cover-both for themselves and their fragile eggs.
Historically, the penguins dug burrows in layers of guano-accumulated seabird and bat feces- that lined Africa’s penguin colonies, but in the 19th century, traders started selling guano(鸟粪)as fertilizer, leaving the penguins and their eggs increasingly exposed to predators and the baking sun. This, combined with other threats such as egg poaching, overfishing and climate change, has caused African penguin populations to plummet. In 2019, they were thought to be less than 20,000 breeding pairs, down from an estimated 1.5 to 3 million birds in 1900.For more than a decade, the species has been listed as endangered by the IUCN.
To date, the African Penguin Nest Project has installed more than 1,500 nests across five of South Africa’s penguin colonies, and plans to expand into Namibia next year, the only other country with breeding populations of the species.
“This is still just a drop in the bucket,” says Graham, who anticipates they will need to deploy at least 4,500 more ceramic homes to protect penguins currently nesting in exposed areas. “The goal is that every penguin that needs a nest will get one.”
1. What is the reason for building the beach huts?| A．To beautify the beach. | B．To conduct research. |
| C．To house the penguins. | D．To balance the ecology. |
| A．Four. | B．Five. | C．Six. | D．Seven. |
| A．Innovate. | B．Increase. | C．Swing. | D．Decline. |
| A．Culture. | B．Environment. | C．Technology. | D．Art. |
