When lightning caused fires around California’s Big Basin Redwoods State Park north of Santa Cruz in August 2020, the fire spread quickly. Mild fires strike coastal redwood (红杉) forests about every decade. The giant trees resist burning thanks to the bark (树皮), up to about 30 centimetres thick at the base, which contains acids. Their branches and needles are normally beyond the reach of flames. But this time flames shot through the top of 100-metre-tall trees, burning the needles. “It was shocking,” says Drew Peltier, a tree expert at Northern Arizona University. “It really seemed like most of the trees were going to die.”
Yet many of them lived. In a paper published yesterday in Nature Plants, Peltier and his colleagues help explain why: The survivors use long-held energy reserves—sugars that had been made from sunlight decades earlier—and poured them into buds (芽) that had been lying dormant (休眠的) under the bar k for centuries.
“This is one of those papers that challenges our previous knowledge on tree growth,” says Adrian Rocha, an ecosystem ecologist at the University of Notre Dame. “It is amazing to learn that carbon taken up decades ago can be used to sustain its growth into the future.” The findings suggest redwoods have the tools to cope with big fires driven by climate change, Rocha says. Still, it’s unclear whether the trees could cope with the regular infernos that might occur under a warmer climate environment.
The fire in 2020 was so intense that even the top branches of many trees burned and their ability to photosynthesize (光合作用) went up in smoke along with their pine needles. Trees photosynthesize to create sugars and other carbohydrates (碳水化合物), which provide the energy they need to grow and repair tissue. Trees do store some of this energy, which they can call on during a drought or after a fire. Although the redwoods have sprouted (长出) new growth, Peltier and other forest experts wonder how the trees will cope with far less energy from photosynthesis, given that it will be years before they grow as many needles as they had before the fire. “They’re alive, but I would be a little concerned for them in the future.”
1. What’s special about this big fire for coastal redwood forests in 2020?A.It burnt the top of the trees. | B.It was very close to the last fire. |
C.It resisted burning effectively. | D.It caused relatively minor damage. |
A.Sugars protected their barks. | B.Energy reserves promoted the growth of buds. |
C.They got used to hot climate. | D.They took in much carbon to resist fire. |
A.Unpredictable disasters. | B.Changeable climate. |
C.Terrible environment. | D.Uncontrollable fires. |
A.Their tissues can’t be repaired. | B.They can’t save energy anymore. |
C.Their energy saved is not sufficient. | D.They grow too slowly. |
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【推荐1】There are plenty of things you can do to live a greener life, through your day-to-day activities, and most of these apply to anyone.
Save energy. The most effective way to cut down on your carbon emissions (排放) is to save energy in your home. Use energy-efficient light bulbs, turn lights off when they aren’t in use, make sure windows are fully closed, and try to reduce the use of your energy.
Protect water. Every drop of tap water you use consumes (消耗) energy. Remember, it needs several processes before it reaches your tap. It might just be water, but a lot of fossil fuel is used for processing it.
Eat greener food.
A.Use less fuel for transport |
B.Create more ways to save costs |
C.Eat less to reduce carbon emissions |
D.In some places, water itself isn’t enough |
E.You’ll save energy and money at the same time |
F.Eating is one thing everyone must do in the world |
G.Animal products have the biggest impact on the planet |
【推荐2】Every week, Angela looked at her recycling bin, filled with shampoo bottles and plastic containers, with mixed feelings. Sure, it was a lot of plastic, but it was going to be recycled. Or so she thought. Then, her husband sent her some articles revealing that less than 6% of the country’s plastic gets recycled. She was shocked.
Determined to cut back on her plastic consumption, Angela got a starter kit from a company selling refillable household cleaners (家用清洁器). In it were tablets, containing concentrated hand soap as well as glass and bathroom cleaners, and four empty containers. She filled each one with tap water, then dropped in a tablet and watched it dissolve. If she was happy with the cleaners, she would order more tablets but reuse the containers. No new plastic required.
Given plastic’s harmful effects on the environment, nearly three quarters of Americans say they are trying to reduce their reliance on single-use plastic, according to Pew Research Center. Since plastic is everywhere and avoiding it altogether is extraordinarily difficult, some, like Angela, have revived a once-customary practice: refilling containers. Household cleaners seem particularly prepared for a refill revolution, for many can be easily concentrated and reconstituted (with water. If just 10% to 20% of plastic packaging are reused, a report from the World Economic Forum estimates, the amount of plastic waste entering the ocean will be cut in half.
Not everyone is as enthusiastic, though. Jan Dell, a chemical engineer, noted that many cleaning products are packaged in PET or HDPE, two types of plastic with relatively high recycling rates. So she is less concerned about them but far more concerned about the packaging of other products. “What companies should be focusing on is everything else that isn’t recyclable, that is single use and that often becomes plastic pollution,” she said, pointing to plastic bags and cups. “This is just a classic example of big corporations doing something to attract people’s attention over here on something that’s not the main issue to distract from all the single-use plastic they’re pushing out.”
1. Why is Angela mentioned?A.To promote a tablet. | B.To lead in the topic. |
C.To clarify a concept. | D.To recommend a kit. |
A.Float over water. | B.Turn over in water. |
C.Change color in water. | D.Mix with water. |
A.Critical. | B.Favourable. |
C.Conservative. | D.Unconcerned. |
A.A chemistry paper. | B.An academic report. |
C.A lifestyle magazine. | D.A cleaner advertisement. |
【推荐3】A new research shows human activity is changing the sound of the Earth’s oceans and seas. Scientists say the sound changes of our oceans, seas, and other waterways affect many marine (海洋的) animals – from very small shrimps to huge whales.
Sound travels very far underwater, Francis Juanes, an ecologist at the University of Victoria in Canada, told the Associated Press. For fish, he explained, sound is probably a better way to sense their environment than light. Sounds help fish and other marine animals survive and communicate with each other. Sounds also help some ocean animals find food and avoid their hunters.
However, increased noise from humans is making it harder for these animals to hear each other. The noise is coming from shipping traffic, underwater exploration, and other noisy human activities. For many marine animals, their attempts to communicate are being masked (掩盖) by sounds that humans have produced. Experts explain that masking happens when one or more noises in the water block sound important to a marine animal’s living. The overall number of marine animals has gone down by about half since 1970. Some studies show the stress from human noise might also affect the immune system as well as reproductive health or behavior. “Imagine having to raise your kids in a place that’s noisy all the time,” said Joe Roman, a marine ecologist at the University of Vermont.
When people think of problems facing the ocean, we often think of climate change, plastics, and overfishing. But noise pollution is another thing we need to be monitoring. “Sound pollution may be easier to deal with than other ocean problems,” Scientist Juanes says. “If we make something for the ocean, think about how to make it quieter.”
1. Why is sound underwater important for ocean animals?A.It changes with light. |
B.It’s difficult to sense. |
C.It helps them survive and communicate. |
D.It helps hunters to find where they are. |
A.Human noise brings stress to marine animals. |
B.Kids should experience noise to be healthy. |
C.Underwater exploration must be stopped. |
D.Marine animals have got used to sound changes. |
A.To introduce the benefits of sounds. |
B.To show the effects of climate change. |
C.To draw attention to sound pollution. |
D.To share a method of studying oceans. |
1. According to the passage, it is good habit to ______ when you are writing your email.
A.include all of your social network links |
B.send your emails to all of your coworkers |
C.use different font size to make the massage vivid |
D.keep the subject line brief |
A.The subject line is filled with Hey instead of being left blank. |
B.Using capitals is acceptable when offering congratulations. |
C.You are supposed to reply to only one person at a time. |
D.Social network links should be included in your signature. |
A.Economists are just crying wolf while actually the economic future is not so bad. |
B.The government is always crying wolf and has never kept the promise to reduce taxes. |
C.He cried wolf when he received a letter saying that his application had been rejected. |
D.He just cried wolf in comforting her when he didn’t know what had really happened. |
【推荐2】The world’s largest whales are more than just astonishing creatures. Much like the ocean, soil and forests, whales can help save humans from the increasing climate crisis by storing carbon. In a paper published recently, climate researchers suggest that whales are important, but often overlooked, carbon sinks.
The enormous size of these marine mammals, which can reach 150 tons, means they can store carbon much more effectively than smaller animals. And because whales live longer than most animals, they could be “one of the largest stable living carbon pools” in the ocean. Even when whales die, their dead bodies fall down to the deepest parts of the sea and settle on the seafloor, trapping the carbon they’ve stored in their bodies. An indirect way whales can be critical carbon sinks is through their waste. Whale poop (粪便) is rich in nutrients which can be taken up by phytoplankton — tiny organisms that suck up carbon dioxide as they grow.
The process of carbon sequestration helps reduce climate impact, because it locks away carbon that otherwise would have warmed the planet somewhere else for hundreds, if not thousands of years.
Yet whales are threatened, with six out of 13 great whale species classified as endangered or vulnerable due to threats including industrial whaling, as well as trap in fishing equipment, climate change-caused shifts in prey availability, noise pollution and more.
Heidi Pearson, a researcher at the University of Alaska Southeast, said the research shows that protecting whales has a double benefit — helping to stop the biodiversity crisis as well as human-caused climate change. Protecting whales is a low risk and low regret strategy, because there’s really no downside. She said there was no risk to this strategy compared to other untested, expensive solutions to capturing and trapping carbon, such as geoengineering.
But there remain big gaps in knowledge to fully determine how whale carbon should be used to slow down climate changes. Pearson hopes the current paper pushes policymakers to consider whales as a significant part of climate change solution.
1. What does paragraph 2 focus on about whales?A.What their life cycles are like. | B.Why their roles are overlooked. |
C.Why they are called carbon sinks. | D.Where they are on the food chain. |
A.The waste of whales. | B.The carbon trap of whales. |
C.The death of whales. | D.The carbon cycle in nature. |
A.Geoengineering is costly and untested. |
B.The strategy involving whales carries no risks. |
C.Protecting whales can be a natural climate solution. |
D.Whales’ survival is the key to stopping biodiversity crisis. |
A.To call for further research on whales. | B.To call on people to balance the ecosystem. |
C.To present a new reason for protecting whales. | D.To stress the need of addressing climate changes. |
【推荐3】Have you ever considered the way you spend your money? What do you buy? When do you buy? It is important to use your money wisely. Then, you will have enough for the things you want. You can make smart decisions about your money. All it takes is some careful, smart thinking.
One way to be smart with your money is to shop around before you buy. Visit more than one store, check the prices at each store, and try not to be in a hurry to buy. You don’t have to buy at the first store you visit; another store might have what you want at a lower price. You can even check online and compare prices.
Another way to be smart with your money is to wait for a sale. Many stores offer special discounts. For example, suppose you want to buy a camera. Wait until a store has a sale. You can save 20 percent, 30 percent, or more on the price of the camera by waiting for a sale. Some stores also offer a discount if you buy more than one of an item. So, look for sales offering a lower price per item if you buy two of that item. You could save money.
You can also use your money wisely by buying larger sizes of things. For example, large bags of dog food usually cost less per pound than small bags cost. A large pack of pens usually costs less per pen than a small pack of pens. So, even though you may spend more on a large size, you are really saving money per item.
You can learn to be smart with your money. It takes some practice, and it takes patience. You cannot always have what you want right away. But if you are patient, you will save money. Then, you will have more money to spend on what you want.
1. Which is one way to save money?A.By waiting for sales. | B.By shopping at only one store. |
C.By shopping in a hurry. | D.By buying small packages of things. |
A.Material. | B.Brand. |
C.Object. | D.Mail. |
A.Mean. | B.Patient. |
C.Wealthy. | D.Lazy. |
A.Being careful with money is wise. | B.It is not important to save money. |
C.Comparing prices takes tricks. | D.It isn’t a good idea to shop online. |
A.To share a personal story. | B.To explain how to do something. |
C.To introduce the things on sale. | D.To show how to get somewhere. |
【推荐1】Kew Gardens is not only a popular tourist destination in London, but also a botanic garden and a research center that has the largest collection of living plants at a single site. So, let’s explore the Royal Botanic Gardens with CGTN’s reporter Robyn Dwyer.
Palm House
The first stop is the Palm House, a giant indoor rainforest with a wide range of plants. Visitors can enjoy these exotic plants while researchers can study the secrets of these flora. Eatable plants such as cocoa tree and African oil palm are all preserved here to keep the diversity of food resources. At the same time, it houses many medical use plants, including some that are used to treat cancer.
Temperate House
Known as the world’s largest Victorian glasshouse, the Temperate House is home to1,500 species of plants from temperate regions of the world. Some of the species kept here have gone extinct in the wild, such as Encephalartos woodii, a cycad from South Africa. And some are already extinct like Saint Helena olive, but the Kew has stored its DNA.
Mediterranean Garden
In the Mediterranean Garden, one can see plants from the Southern Europe, such as rosemary, olives and cork oak. Walking in the garden, one can feel the non-indoor vibe (氛围) of the Mediterranean and learn about the economic as well as scientific uses of these plants.
On International Day for Biological Diversity this year, join CGTN to travel around the world’s national parks and reserves across seven continents. Our next program is to visit penguins and seals in the Antarctic Ice Aquarium Norway. Please stay tuned!
1. What do the three stops have in common?A.They store plants for medical use. |
B.They have plants of economic value. |
C.They house plants of seven continents. |
D.They own plants for scientific research. |
A.Palm House. | B.Temperate House. |
C.Antarctic Ice Aquarium. | D.Mediterranean Garden. |
A.A botanic dictionary. | B.A TV travel series. |
C.A trip advertisement. | D.A biodiversity essay. |
【推荐2】In recent years, scientists have discovered that mushrooms are much more than just a tasty addition to your favorite dish. In fact, they are the “Internet of trees” — a vast network of underground mycorrhizal (菌根的) fungi (真菌) that connects trees and other plants in a similar way to how the Internet connects people.
The mycorrhizal network is made up of hyphae (菌丝),which connect the roots of different plants and trees. These hyphae act like an underground internet, allowing plants to exchange nutrients, water, and even hormones (激素). For example, if one tree is under stress due to drought or disease, it can send out hormones to warn other nearby trees of the danger. The other trees can then prepare themselves for the coming threat.
Human beings can help trees and mushrooms by practicing “mycorestoration” in regenerative projects. With the Global Tree Initiative working towards reforestation and preserving natural habitats, it is important to share how mycorestoration can supply innovative ways to mitigate the impact of human activities.
Fungi are natural decomposers (分解器) that break down complex organic matter, like dead trees, into simpler compounds that can be absorbed by plants. This decomposition process is crucial for the health of our forests, as it contributes to nutrient cycling, soil formation, and carbon sequestration. By introducing native fungi species into areas where deforestation has occurred, we can help regenerate soil and support the growth of new trees. Fungi form symbiotic (共生的) relationships with tree roots, improving their ability to absorb water and nutrients. This increased access to resources accelerates tree growth and improves their resilience to stress, such as drought or disease.
Fostering sustainable communities through mycorestoration can be conducted through global partnerships that promote ecology within Ecovillage Design Education. The Global Ecovillage Network’s presence in five continents and in over 8,000 communities around the planet, helps the regenerative approach to community building and preservation of existing forests. By promoting sustainable land management practices and reducing our reliance on extractive industries, ecovillages can help prevent deforestation and protect the habitats of countless plant and animal species.
1. The “Internet of trees” can function as ________.A.A linker of hormones. | B.A warning of danger. |
C.A detector of diseases. | D.A destroyer of nutrients. |
A.Assess. | B.Increase. | C.Relieve. | D.Underestimate. |
A.They produce more water and nutrients. |
B.They help form complex plant-friendly compounds. |
C.They accelerate the process of carbon sequestration. |
D.They help with soil regeneration and tree growth. |
A.Promoting ecological education. |
B.Preserving existing forests. |
C.Building independent communities. |
D.Reducing reliance on industries. |
【推荐3】The first great agricultural revolution happened 10,000 years ago, when humans settled on farms. The second was the “green revolution” from the 1930s to the 1960s, in which advances in fertilization, mechanization, and irrigation dramatically increased global food production. The third is likely to come from information, as digital technology and big data help farmers make better decisions and drive up crop production.
Michael Stern, president and chief executive officer of Climate Corp., said that the ability to gather detailed information about farmers’ fields, coupled with advances in weather forecasting, computing power, and artificial intelligence, will change farming from a business that often reacts to the past—applying insecticide this year because of a disease outbreak last year—to one that uses real-time data and weather forecasts to make more accurate decisions for the season to come.
Over the course of a growing season, farmers make 40 to 50 key decisions that affect crop performance. Recent trends that have swept other areas of society—such as cheap data storage, the ability to transfer data witlessly, and dramatic increases in computing power—have the potential to transform the farm.
Stem offered the example of a farmer preparing for the regular fall fertilizing of his fields who delays the application after being informed of a coming storm. That decision reduces runoff, keeps fertilizer on the field, and helps controls farmer’s costs. As data gathers season after season, computer models will help farmers better manage fertilizer and other additions to optimize production and minimize runoff.
Remote sensing is another way that modern technology can help farmers know what’s going on in their fields. Many farmers drive around to monitor growth and watch for pests and diseases. But these surveys are typically random and don’t cover more than 2 percent of a field. Remote sensing can provide accurate data that covers an entire field and cables recommendations tailored to what’s going on in the stricken area.
1. What may the third agricultural revolution help farmers do in the future?A.Make reasonable decisions. | B.Grasp computing ability. |
C.Deal with big data. | D.Develop business potentials. |
A.To confirm the coming of a storm. | B.To explain the reason of fertilizer runoff. |
C.To stress the effect of information application. | D.To show the use of computer models. |
A.It can show typical random. | B.It can drive up crop production |
C.It can remove pests and diseases. | D.It can offer exact statistics. |
A.Opposed. | B.Neutral. | C.Positive. | D.Unclear. |