1 . According to a new USDA(the U.S.Department of Agriculture)report,U.S.forests could worsen global warming because they are being destroyed by natural disasters and are losing their ability to absorb planet-warming gases as they get older.The report predicts that the ability of forests to absorb carbon will start declining after 2025 and that forests could release up to 100 million metric tons of carbon a year as their emissions from decaying(腐烂)trees go above their carbon absorption.Forests could become a“substantial carbon source”by 2070,the USDA report says.
The loss of carbon absorption is driven in part by natural disasters such as wildfires, tornadoes and hurricanes,which are increasing in frequency and strength as global temperatures rise.The disasters destroy forestland,destroying its ecosystem and decreasing its ability to absorb carbon,according to Lynn Riley,a senior manager of climate science at the American Forest Foundation.Aging forests also contribute.The report found that older,mature trees absorb less carbon than younger trees of the same species,and U.S.forests are rapidly aging.
This trend is likely to continue,as forests come under increasing threat from climate change and exploitation(开采).The typical tropical forest may become a carbon source by the 2060s,according to Simon Lewis,professor in the school of geography at Leeds University. “Humans have been lucky so far,as tropical forests are cleaning up lots of our pollution,but they can’t keep doing that indefinitely,”he said.“We need to cut down fossil fuel emissions before the global carbon cycle starts working against us.”
U.S.forests currently absorb 11 percent of U.S.carbon emissions,or 150 million metric tons of carbon a year,equal to the combined emissions from 40 coal power plants,according to there port.The loss of forests as natural carbon absorbers will require the U.S.to cut emissions more rapidly to reach net zero.“As we work to decarbonize(碳减排),forests are one of the greatest tools.If we were to lose that tool,it means we will contribute that much more in emissions,”Riley said.
1. What is the main finding of the report?| A．Forests are suffering from decaying trees. |
| B．Forests could contribute to global warming. |
| C．Forests are being destroyed by natural disasters. |
| D．Forests have become substantial carbon absorbers. |
| A．The key role of forests in the ecosystem. |
| B．The consequences of frequent natural disasters. |
| C．The impact of rising global temperatures on forests. |
| D．The reasons for forests’ declining ability to absorb carbon. |
| A．Reducing fossil fuel emissions. |
| B．Cleaning up decaying trees in time. |
| C．Planting trees on a large scale. |
| D．Limiting the exploitation of forests. |
| A．To offer suggestions on forest management. |
| B．To stress the significance of forest protection. |
| C．To present the efforts made to reach net zero. |
| D．To show the carbon emissions from coal power plants. |
2 . Boston Marathon runners in recent years may have seen a smiling furry face around the two-mile mark. It’s Spencer, the therapy (治疗) dog, who became known as an unofficial mascot (吉祥物) for the marathon, He’s shown up on the sidelines every year since 2015—rain or shine.
One particularly rainy marathon catapulted Spencer’s fame, In 2018, his owner, Richard Powers, decided to put a bright yellow rain coat on the dog, making him stand out even more than he usually does. Photos of Spencer, who holds a “Boston Strong” flag in his mouth, went viral, and he became an inspiration to runners and onlookers alike, During the marathon, some runners stop in their tracks to take selfies with the dog-the line sometimes growing to 20 runners long.
But in 2020, Spencer was diagnosed with a tumor (肿瘤). His owner was worried, but Spencer is a fighter. He got the care he needed and survived. In 2021, he was back on the course and it was really kind of a miracle and that really hit home to a lot of people.
Unfortunately, Spencer caught another tumor—this one cancerous—and Spencer began chemotherapy. Powers didn’t think his beloved dog would make it out to the marathon of 2022. “Miraculously, he’s still here with us and an even bigger miracle, he was strong enough to go to the marathon,” he said.
After recovering, Spencer was back to work—not just at the marathon—but as a therapy dog, alongside his companion, Penny, who is also a golden therapy dog. Powers takes his two therapy dogs around to schools, hospitals and senior living centers.
“He’s a gift to us and we’re very lucky to have him. He’s too good so we want to share him with as many people as we possibly can. He does make a difference,” Powers said.
1. Why is Spencer referred to as a mascot for Boston Marathon?| A．He has a smiling furry face. | B．He appears at the event annually. |
| C．He is not recognized officially. | D．He works as a therapy dog for runners. |
| A．Motivation. | B．Satisfaction. | C．Fantasy. | D．Barrier. |
| A．A failure in the marathon. | B．Caring for his owner. | C．Fighting against a disease. | D．Going viral. |
| A．Confident, | B．Supportive. | C．Objective. | D．Negative. |
3 . Wildlife conservation is the practice of protecting plant and animal species and their habitats. As part of the world’s ecosystems, wildlife provides balance and stability to nature’s processes. Wildlife conservation is aimed to ensure the survival of these species and educate people on living sustainably with other species.
The number of people has grown to more than eight billion today, and it continues to rapidly grow. The economic growth endangers the habitats and existence of various types of wildlife around the world, particularly animals and plants that may be displaced for land development, or used for food or other human purposes. This threat is at top of the list and means natural resources are being consumed faster than ever by the billions of people on the planet. The introduction of invasive species from other parts of the world is another threat to wildlife. Other threats include climate change, pollution, fishing and hunting.
International organizations like the World Wildlife Fund, Conservation International, Wildlife Conservation Society and the United Nations work to support global animal and habitat conservation on many different fronts. They work with the government to establish and protect public lands, like national parks and wildlife protection areas. They help write legislation(法规), such as the Endangered Species Act(ESA)of 1973 in the United States, to protect various species. They work with law enforcement to charge those with wildlife crimes. They also promote biodiversity to support the growing human population while preserving existing species and habitats.
National Geographic Explorers, like conservation biologists Camille Coudrat and Titus Adhola, are working to slow the extinction of global species and protect global biodiversity and habitats. Environmental filmmakers and photographers, like Thomas P. Peschak, are essential to conservation efforts as well, documenting and bringing attention to endangered wildlife all over the world.
1. Which is a goal of wildlife conservation according to the text?| A．To stop introducing invasive species. | B．To encourage harmonious coexistence. |
| C．To control the number of world people. | D．To increase the use of natural resources. |
| A．Hunting. | B．Human activity. | C．Pollution. | D．Climate change. |
| A．The activities of protection areas. |
| B．The importance of biodiversity promotion. |
| C．The relevant efforts of international organizations. |
| D．The great impact of wildlife crimes on ecosystems. |
| A．The necessity of legislation. |
| B．The wildlife conservation’s achievements. |
| C．The individuals’ contributions to the environment. |
| D．The statistics about the wildlife conservation efforts. |
4 . This is the time of year when many gardeners are harvesting tomatoes. Gardening expert Jessica Damiano recently reported about the many pictures of strangely shaped tomatoes sent to her from fans of her gardening advice.
Not every tomato on an affected plant will be deformed (改变形状), however. What are the possibilities? Under the right conditions (temperatures that are too hot or even too cold), this could affect one or two tomatoes per plant, depending on where they are in the development process and what the (weather) conditions are, said Timothy McDermott, a professor at Ohio State University. The possibility of one of your tomatoes developing a locule oddity (怪异) is about one in a thousand, McDermott said.
And, when harvesting your crop, remember:
| A．select the good-looking ones. |
| B．Any tomato can grow an extra locule. |
| C．the funny-looking tomatoes taste just as good! |
| D．What causes the unusual appearance of tomatoes? |
| E．Unless otherwise diseased, they are perfectly good for eating. |
| F．She said people sometimes question if the tomatoes are okay to eat. |
| G．Provide shade for your plants when temperatures are predicted to remain above 32℃. |
5 . During the summer of 2021, I flew to Greece to learn more about the wildfires there. I wanted to hear people’s stories, to understand what it meant to be displaced by environmental disaster.
In a cafe for people surviving the fire, I met brave children who now have to live with terrible scars, physical and emotional. I met a man who could not even speak to me, his eyes filling with tears.
I was expecting to hear a lot about loss; I was not expecting to learn so much about the attribution (归因) of blame. I came to understand how desperately people needed to blame a tangible entity (实体) –a person, a group of people, the government. Indeed, this was understandable and reasonable. The outbreak and mishandling of the fire needed to be explored, looked into and dealt with.
What surprised me, however, was that the survivors were completely silent over any mention of the climate crisis and global heating. It was made clear to me that this subject was unacceptable. Survivors felt that these issues had nothing to do with what they had suffered, and that the people actually responsible needed to pay.
But when it comes to climate breakdown, blame did not come to just one person, one corporation, one country. In Greece, the fire didn’t rage so hard because someone had set off a spark—— it raged so hard because years of global heating had dried up the land, part of a set of unsustainable (不能持续的) practices and inaction that had set our planet on fire. And now the fires are even worse.
The more I spoke to people, including climate scientists, the more I came to see that there is often a gap that separates science from public awareness. In her book “Engaging With Climate Change” Sally Weintrobe says that “many people who accept global warming continue to regard it as a problem of the future”. To my astonishment, this seemed to apply even to people who had themselves been affected directly by wildfires.
1. What did the author hardly expect to learn in Greece?| A．Kids’ scars. | B．Economic loss. |
| C．Survivors’ blame. | D．Duration of the fire. |
| A．It was closely related to global heating. |
| B．They couldn’t accept its massive destruction. |
| C．The government should be responsible for it. |
| D．It resulted from someone’s setting fire to the forest. |
| A．Much attention has been given to it. |
| B．People don’t consider it serious now. |
| C．Scientists are urged to apply efficient way to it. |
| D．People should make their opinions about it heard. |
| A．To inform readers of wildfires in Greece. |
| B．To encourage readers to donate to survivors. |
| C．To equip people with surviving skills in wildfires. |
| D．To raise people’s awareness about the climate crisis. |
6 . Soaring to 29, 035 feet, the famous Mount Everest had long been considered unclimbable due to the freezing weather, the obvious potential fall from cliffs and the effects of the extreme high altitude, often called “mountain sickness.” But that was to be changed by Edmund Hillary.
When he was invited to join the British Everest expedition in 1953, Edmund Hillary was a highly capable climber. The glacier-covered peaks in his hometown in New Zealand proved a perfect training ground for the Himalaya. It was his fourth Himalayan expedition in just over two years and he was at the peak of fitness.
On May 28, 1953, Edmund Hillary and Tenzing Norgay, an experienced Sherpa (夏尔巴人) set out and reached the South Summit by 9 a. m. next day. But after that, the ridge (山脊) slightly fell before rising suddenly in a rocky spur (尖坡) about 17 meters high just before the true summit. The formation is difficult to climb due to its extreme pitch because a mistake would be deadly. Scratching at the snow with his ax, Hillary managed to overcome this enormous obstacle, later to be known as the Hillary Step.
At 11:30 a. m, the two men found themselves standing at the top of the world. “Not until we were about 50 feet of the top was I ever completely convinced that we were actually going to reach the summit.” Hillary later recounted, “Of course I was very, very pleased to be on the summit, but my first thought was a little bit of surprise. After all, this is the ambition of all mountaineers.”
Emerging as the first to summit Mount Everest, Hillary Hillary continued by helping explore Antarctica, and establishing the Himalayan Trust (信托基金), through which he provided a number of beneficial services to the Himalayan peoples. He also a sizeable legacy that mountain climbers have chased ever since. As a young climber said, “It was not just Hillary and Tenzing that reached the summit of Mount Everest. It was all of humanity. Suddenly, all of us could go.”
1. What made Edmund Hillary a capable climber on the 1953 expedition?| A．His undisputed reputation. | B．His remarkable physical condition. |
| C．His previous training on Mount Everest. | D．His exceptional ability to adapt to the cold. |
| A．A mistake Hillary avoided making. | B．A steep spur of rock Hillary conquered. |
| C．An ax Hillary used to scratch snow. | D．A sudden fall of a ridge Hillary skipped. |
| A．Overwhelming joy. | B．Enormous pride. |
| C．Complete disbelief. | D．A touch of astonishment. |
| A．It opens up possibilities for other climbers. |
| B．It enabled him to give back to his hometown. |
| C．It left financial benefits for climbers to pursue. |
| D．It led to friendly regulations for mountaineering. |
7 . Cancer-fighting genes in elephants could help tackle one of the biggest killers of people, according to research. Despite their large bodies and long lifespans, elephants are much less likely to die from cancer than humans, with death rates of less than 5 percent.
The paradox has puzzled scientists because more cells lead to greater replications (复制), which increases the possibility of the body failing to detect damaged DNA or a faulty cell that can result in tumors(肿瘤). Elephants live for almost as long as humans and weigh up to five tons.
However, a group of British and European scientists say they have taken a big step towards solving Peto’s paradox, named after the British epidemiologist Sir Richard Peto. Elephants, they say, carry a much larger more diverse group of tumor-fighting proteins.
The findings, published last week in the journal Molecular Biology and Evolution, raise hopes that the cancer fighting genes in elephants could be the key to tackling cancer, which kills about 167, 000 Britons yearly. Cells keep dividing throughout an organism’s life, each carrying the risk of producing a tumor. One of the body’s weapons is a gene called p53 known as the “guardian of the genome”, which hunts cells with faulty DNA. It encourages the cell to repair itself or self-destruct, keeping the cell from combining with others and producing tumors.
Humans have two versions of p53 but elephants have 40, said the researchers. Biochemical analysis and computer simulations also showed that an elephant’s p53 genes are structurally slightly different, providing a much larger anti-cancer toolkit. The researchers suspect that while faulty cells might be able to skirt two p53 versions, they cannot combine with other cells as easily in the face of dozens.
The findings will open the way for research on how p53 genes of elephants are activated and on medical treatment for humans.
1. What has puzzled scientists?| A．Few elephants end up dying from cancer. | B．Elephants live long and weigh enormously. |
| C．More cells lead to higher chances of tumors. | D．A larger body is less likely to discover faulty cells. |
| A．How many Britons die each year. | B．How the anti-cancer gene works. |
| C．How the research was carried out. | D．What the findings have been applied to. |
| A．Strengthen. | B．Detect. | C．Escaped. | D．Cure. |
| A．Scientists find elephants live longer than humans. | B．P53 genes play essential role in preventing cancer. |
| C．Elephant genes could be key to fighting cancer. | D．Groundbreaking treatment for cancer is on the way. |
8 . This summer has brought extreme heat and droughts to places around the world. The droughts are leading to serious problems, including shortages of food and energy, problems with transportation, and food price increases. The effects of the droughts are likely to be felt for years.
From Africa to Europe to the US to China, record temperatures and low rainfall have been causing problems. Droughts aren’t new, but Earth’s rising temperatures because of global warming are making them much harder to avoid.
The drought in the Horn of Africa may be the most serious situation. For several years, the area has had very little rain during the rainy seasons. Now the area, which includes Ethiopia, Kenya, and Somalia, is suffering from its worst drought in 40 years.
Almost two-thirds of Europe is threatened (威胁) by what may be the worst drought there in 500 years. With temperatures reaching 40℃ and hotter, many crops have been damaged. In France, Spain, Portugal, and even Britain, firefighters have struggled to control wildfires.
In the US, many states that use water from the Colorado River are struggling with low water levels. Farmers in California and Arizona have been hit particularly hard. In California water use is being limited now and farmers aren’t able to grow as many crops. That can drive up food prices, and that affects everyone.
China is facing similar problems. It has been attacked by a terrible drought this summer, with temperatures as high as 45℃. The drought has dried up much of the water in the Yangtze, China’s longest river. That has cut the amount of energy produced by the world’s largest dam by 40%.
There are no easy solutions for any of these droughts. It took years to create the climate crisis, and it will take a long time to get it under control. For now, governments and people will need to carefully manage water supplies and other resources to limit the damage as much as possible.
1. What does the underlined word “them” in Paragraph 2 refer to?| A．Problems. | B．Droughts. |
| C．The effects of the droughts. | D．Earth’s rising temperatures. |
| A．Wildfires. | B．Food prices. |
| C．Water limits. | D．High water levels. |
| A．By giving some examples. | B．By offering some reasons. |
| C．By answering some questions. | D．By explaining some puzzles. |
| A．The Reasons Behind Worldwide Droughts |
| B．The Effects of Extreme Heat and Droughts |
| C．Droughts Cause Problems Around the World |
| D．Solutions Are Needed for Worldwide Droughts |
9 . Do you know that the oldest tree is a 5, 000-year old bristlecone pine (狐尾松) located in the forests of Nevada? Unfortunately, many of these precious old-growth trees are starting to disappear from our planet. The term old-growth refers to trees that are 150 years or older. This means that many of the trees on the Earth today are younger, smaller, and have shorter lifespans.
As the Earth’s temperature warms up due to climate change, it is having unintended effects on the world’s forests. When temperatures rise, trees close their pores (气孔) to prevent the loss of moisture, and this, in turn, slows down the process of photosynthesis (光合作用). As a result, these trees are shorter and grow slowly, as well as have a high deathrate. Climate change also increases the possibility of droughts and wildfires. After wildfires, it takes a while for the forest ecosystems to recover, and in some cases, the forests are lost permanently. Trees that are stressed are also susceptible (易受影响的) to attacks by bacteria (细菌). Finally, humans have changed the forest landscape through logging (伐木).
There are some who claim that increased greenhouse gas emission is helping trees grow faster because CO2, is needed for photosynthesis. While some younger trees may benefit from this, we are seeing significantly more loss of forests than gain.
Old-growth forests are a storehouse of carbon, and when they die, the stored CO2, is released into the air worsening the greenhouse effect. Older forests have higher biodiversity, which is beneficial as each organism has a role to play and there is a wide variety of species. As these forests disappear, species that once called them “home” are forced to relocate, affecting the biodiversity of those ecosystems. Unfortunately, some endangered species are unable to adapt and go extinct.
With trees dying continuously, will future generations miss out on the wonders of forests?
1. What is the main idea of the second paragraph?| A．Why bacteria may attack old trees. | B．What leads to the rising temperatures. |
| C．Why old-growth forests are disappearing. | D．How global warming causes natural disasters. |
| A．Species. | B．Older forests. | C．Organisms. | D．Roles organisms play. |
| A．a doubt | B．a warning | C．a blame | D．a suggestion |
| A．To urge people to reduce gas emission. | B．To explain the greenhouse effect on trees. |
| C．To introduce the process of photosynthesis. | D．To call on people to protect old-growth trees. |
10 . Whales are threatened by a variety of human activities off the West Coast of the United States, including fishing, ship traffic, and pollution. They have bad effects on whale populations, but are rarely addressed by current whale-protection policies in California, according to a study from the University of California, Davis.
The study, published for open access this week in the journal Marine Policy, examines the main causes of death for nine whale species in the California Current Ecosystem, which stretches from British Columbia, Canada to Baja California, Mexico. The whales considered in the study include gray, blue, fin, minke, North Pacific right, and killer whales.
“We find that it is people that deem fishing causes whale death,” said co-leading author Eliza Oldach. “But a number of human activities have made the modern ocean a really tough environment for whales to survive. We’re excited about efforts that look broadly to rebuild healthy oceans.”
The report found that main contributors to whale death are currently, targeted with relevant policy responses: noise, water quality and marine (海洋的) rubbish. But three other threats-nutritional stress, disease and predation (捕食) -need to also be considered to provide a more whole approach toward managing whale deaths.
“Gray whales migrate (迁徙) over 5,000 miles between their breeding grounds at either end of the California Current,” said co-leading author Helen Killeen. “Throughout their journey, they must pass through a large number of human activities, fighting with changes to their environment caused by climate change.”
The study comes as the California Ocean Protection Council (COPC) aims to develop a plan for achieving zero death for whales in the California Current Ecosystem this year. Achieving such a goal requires understanding the key drivers of whale deaths and opportunities for policy change, the report said.
1. Which activity will lead to whales’ death?| A．Going fishing with your friends in a river. | B．Playing with your friends beside the sea. |
| C．Going sailing with your family on weekends. | D．Throwing rubbish in the sea as you are playing. |
| A．Catch. | B．Complain. | C．Think. | D．Describe. |
| A．Gray whales are fond of travelling. | B．Gray whales’ migration is full of danger. |
| C．Human being is the only killer of whales. | D．Whales’ death is mainly caused by climate. |
| A．Get rid of the present policy. | B．Plant more trees along the sea. |
| C．Know what actually leads to it. | D．Find a right place for them to live. |
