1 . With no special equipment, no fences and no watering, two abandoned agricultural fields in the UK have been rewilded (重新野化), in large part due to the efforts of jays, which actually “engineered” these new woodlands. Researchers now hope that rewilding projects can take a more natural and hands-off approach and that jays can shed some of their bad reputations.

The two fields, which researchers have called the New Wilderness and the Old Wilderness, had been abandoned in 1996 and 1961 respectively. The former was a bare field, while the latter was grassland—both lay next to ancient woodlands. Researchers had suspected that the fields would gradually return to wilderness, but it was impressive to see just how quickly this happened, and how much of it was owed to birds.

Using aerial data, the researchers monitored the two sites. After just 24 years, the New Wilderness had grown into a young, healthy wood with 132 live trees per hectare, over half of which (57%) were oaks. Meanwhile, the Old Wilderness resembled a mature woodland after 39 years, with 390 trees per hectare.

“This native woodland restoration was approaching the structure (but not the species composition) of long-established woodlands within six decades,” the researchers explained in the study.

Part of this reforestation was done by the wind, and researchers suspect that previous ground disturbance may have aided the woodland establishment—which is good news, as it would suggest that agricultural areas may be reforested faster than anticipated. However, animals—Eurasian jays, thrushes, wood mice, and squirrels—also played an important role in helping the forests take shape. This handful of species provided much of the natural regeneration needed for the forest to develop. Jays, in particular, seem to have done a lot of heavy lifting.

1. What does the underlined word “shed” in Paragraph 1 refer to?

A．Be opposed to.

B．Be ashamed of.

C．Get used to.

D．Get rid of.

2. Which aspect of the changes in the two fields impressed the researchers?

A．The scale of the woodlands.

B．The diversity of the fields.

C．The rate of the changes.

D．The frequency of the wilderness.

3. What does the author want to tell us by providing some data in Paragragh 3?

A．The woodland restoration was approaching the structure of long-established ones.

B．Much of the wilderness of the fields was owed to birds.

C．Previous ground disturbance aided the woodland establishment.

D．How quickly the fields returned to wilderness over time.

4. What does the last paragraph mainly talk about?

A．The essential role of humans in the reforestation.

B．The factors that contribute to the reforestation.

C．The importance of woodland establishment.

D．The threats faced by a handful of wild animals.

2 . Lichens (地衣)

Lichens look like splashes of paint left behind by a careless painter. Unlike many plants, they do not require soil to grow. They grow on trunk of trees in steaming tropical rain forests, on farmers’ fenceposts, on the bricks of big-city buildings, and on old gravestones. Lichens can tolerate extremes of climate. They grow on rocks in hot springs, on wind-swept mountaintops, and on stones in the driest deserts. In the Arctic, lichens are the principal source of food for reindeer. Whole mountainsides in Antarctica appear green and orange because of the presence of lichens; they are one of the few plants that can survive there. They are among the oldest of known plants. Recently, scientists discovered lichen fossils on a rock in a mine in southwest China that date back 600 million years.

When conditions become harsh, lichens become dormant (休眠). If there is not enough moisture, they simply dry up, but a short rain or even a heavy dew gives them new life. When growing on rock surfaces, lichens produce acids that dissolve (溶解) the minerals, contributing to the process of weathering by which rocks are slowly turned to soil. This property enables lichens to be pioneers. They appear on barren rock rubbed clean by glaciers, fires, lava flows, or floods, beginning the process of soil formation that allows mosses (苔藓) and other plants to later take root. But, despite their hardiness, lichens are extremely sensitive to airborne particles(颗粒). That’s why they serve as an early warning system for air pollution.

It is the acids lichens produce that give them their distinctive colors. Lichens are often spoken of in the same breath as mosses, and some lichens are even called mosses, but true mosses are all distinctively green, whereas lichens appear in many vivid colors. At one time, acids from lichens were used to make dyes, such as the purple dye, the blue dye, and the red dye, and they are sometimes still used that way today. Some lichens, such as oakmoss, contain oils that produce fragrant odors used in scented soaps, cosmetics and perfumes. Some lichens are also known to have antibiotic properties to kill bacteria.

So definite are the form, color, and characteristics of these organisms that for hundreds of years lichens were constantly under scientists’ microscope.

1. What characteristic of lichens is mainly talked about in paragraph 1?

A．They grow only on rock surfaces.

B．They live primarily in cold places.

C．They have adapted to a wide variety of environments.

D．They live in remote locations far from human communities.

2. The author refer to lichens as pioneers in paragraph 2 because they __________.

A．have their primitive structure

B．grow in areas before other plants do

C．are found in remote parts of the world

D．develop so early in the history of the planet

3. According to paragraph 3, humans use lichens in the following ways EXCEPT __________.

A．as a means of coloring clothing

B．as a type of medicine

C．as a source of food

D．as an ingredient in perfume

4. Which of the following cases would be probably dealt with in the next paragraph?

A．Lichens are important in Canada because of their abundance in the north.

B．Extracts of lichens were sold as herbal medicines to facilitate hair growth.

C．Glacier Park’s vast array of lichens indicate relatively good air quality.

D．A German botanist first found lichens are composed of two life forms.

3 . It turns out that sunflowers are more than just a pretty face: the ultraviolet (紫外线的) colours of their flowers not only attract pollinators (传粉者), but also help the plant regulate water loss, according to new research.

The yellow sunflower is a familiar sight, but it’s hiding something from the human eye — an ultraviolet bullseye (靶心) pattern, invisible to humans but not to most insects including bees. These bullseye patterns have long been known to improve the attractiveness of flowers to pollinators by increasing their visibility.

“Unexpectedly, we noticed that sunflowers growing in drier climates have flowers with larger ultraviolet bullseyes, and found that those flowers are able to keep water more efficiently. This suggests that these larger ultraviolet bullseyes help plants adapt to these drier environments,” says Dr. Marco Todesco.

Dr. Todesco and his colleagues grew almost 2,000 wild sunflowers of two species at the university in 2016 and 2019. They measured the sunflowers’ ultraviolet patterns, and analyzed the plants’ genes, and found that wild sunflowers from different parts of North America had ultraviolet bullseyes of very different sizes.

Larger floral ultraviolet patterns that have more of these compounds could help reduce the amount of water loss from a sunflower in environments with lower humidity (湿度), preventing too much water loss. In humid, hot environments, smaller ultraviolet patterns would promote the water loss, keeping the plant cool and avoiding overheating.

Sunflowers are planted for various purposes, including sunflower oil production, a roughly $20 billion industry in 2020. This research could help add to knowledge about how to attract pollinators, potentially increasing crop yields, says Dr. Todesco. “This work also helps us understand how sunflowers, and potentially other plants, better adapt to different areas or temperatures, which could be important in a warming climate.”

1. What do we know about sunflowers?

A．They don’t need pollinators.

B．Their flowers have special functions.

C．Their flowers can drive the insects away.

D．They can be grown in extremely cold areas.

2. What did Dr. Todesco and his colleagues do?

A．They analyzed 2000 kinds of sunflowers.

B．They planted sunflowers to carry out research.

C．They travelled to different parts of South America.

D．They helped people in North America plant sunflowers.

3. What is Dr. Todesco’s attitude to the research on sunflowers?

A．Positive.	B．Doubtful.
C．Negative.	D．Critical.

4. What can be the best title for the text?

A．A Hidden Function of Flowers of Sunflowers

B．Researchers Found a New Species of Sunflower

C．Sunflowers Can Change the Colours of Sunshine

D．Ultraviolet Bullseye Patterns Attract More Insects

4 . Being highly connected to a strong social network has its benefits. Now a new study is showing the same goes for trees, thanks to their underground neighbors. The study is the first to show that the growth of adult trees is linked to their participation in fungal networks living in the forest soil. Though past research has focused on young trees, these findings give new insight into the significance of fungal networks to older trees — which are more environmentally beneficial for functions like capturing carbon.

“Large trees make up the main part of the forest, so they drive what the forest is doing,” said researcher Joseph Birch, who led the study. When they live in the forest soil, fungal networks act as a sort of highway, allowing water, nutrients and compounds to flow back and forth among the trees. The network also helps nutrients flow to resource - limited trees like family units that support one another in times of stress.

Cores taken from 350 Douglas firs (花旗松) showed that annual tree ring growth was related to the extent of fungal connections a tree had with other trees. They had much higher growth than those that had only a few connections. The research also showed that trees with more connections to many unique fungi had much greater growth than those with only one or two connections. “If you have this network that is helping trees grow faster, that helps capture more carbon year after year. These networks may help trees grow more steadily even as conditions become more stressful, and could even help protect them against death.” said Birch.

Birch hopes his findings lead to further studies in different kinds of forests in other geographical areas, because it's likely that the connections among trees change from year to year. He said, “Knowing whether fungal networks are operating the same way in other tree species could factor into how we reforest areas after harvesting them, and it could inform how we want to plant trees to preserve these networks.”

1. In what way do the new findings differ from the previous ones?

A．They confirm the benefits of fungal networks.	B．They demonstrate a new way to capture carbon.
C．They clarify misunderstanding of fungal networks.	D．They reveal the value of fungal networks to adult trees.

2. How do fungal networks help trees?

A．By fighting against diseases.	B．By bettering forest soil conditions.
C．By acting as the center of family units.	D．By maintaining the balance of resources.

3. What does the underlined “They” refer to in Paragraph 3?

A．Tree rings.

B．Fungal networks.

C．Douglas firs.

D．Cores from Douglas firs.

4. Which field will most benefit from the study according to the text?

A．Geography.

B．Agriculture.

C．Reforestation.

D．Microbiology.

5 . An Oil for Life

Maria Alcala of Madrid speaks for many Mediterranean people when she says that “a meal without olive oil would be a bore.” No one knows when the Mediterranean civilizations fell in love with olives. That occurred before recorded history. However, there is evidence that the cultivation (种植) of olive trees began in countries around the Mediterranean Sea in approximately 4000 B.C., and 2000 years after that people in the eastern Mediterranean area began to produce oil from olives. The Mediterranean still accounts for 99 percent of all world olive oil production.

From ancient times until today, the basic process of producing the oil is the same. First, whole olives are pressed hard into pieces. Then, the liquid is separated from the solids. After that, the valuable oil is separated from the water.

Many olive growers make their ancient traditions continue and still harvest the olives by hand. “We harvest in the traditional way,” says Don Celso, an olive farmer from Tuscany, Italy. “It would be less expensive to do it with machines, but it’s more a social thing. Twenty people come to help with the harvest, and we pay them in oil.”

Olive oil has had a variety of uses through its long history. In ancient times, olive oil was used as money and as medicine. It was even used during war—heated up and dropped down on attackers. It is still used in religious ceremonies. It is great for protecting the freshness of fish and cheese. There are even olive oil lamp and olive oil soaps.

One important study shows that Mediterranean people have the lowest rate of heart disease among Western nations. This is partly associated with their frequent use of olive oil. Other studies show that food cooked in olive oil is healthier, and that eating olive oil twice a day reduces women’s risk of getting breast cancer. The world is beginning to understand its benefits, and olive oil is no longer an unusual sight at dinner tables outside the Mediterranean area. The olive oil producing countries now sell large amounts of olive oil to countries in Europe, Asia, Africa, and North and South America.

Olive oil improves the lives of people everywhere. Its benefits, recently confirmed by science, were already understood in ancient times. Mediterranean people are happy to share their secret with the world.

1. Which step occurs first in olive oil production?

A．Drying the olives under the sun.	B．Separating the oil from the water.
C．Separating the liquid from the solids.	D．Pressing the whole olives into pieces.

2. Which use of olive oil is NOT mentioned in the passage?

A．Paint.

B．Medicine.

C．Money.

D．Soap.

3. Why does the author include information about several studies of olive oil?

A．To give reasons why olive oil is similar to medicine.

B．To show how the biology of Mediterranean people is special.

C．To explain the growing interest in olive oil around the world.

D．To prove that olive oil is more important for women than for men.

4. What is the passage mainly about?

A．Discussing olive oil production outside the Mediterranean area.

B．Explaining the history, production, benefits, and use of olive oil.

C．Showing why olive oil is produced around the Mediterranean Sea.

D．Comparing Mediterranean olive oil with that produced in other places.

6 . Flower scents (香味) help pollinators (传粉者) locate their favorite plants. Scientists have established that air pollutants change those scents, throwing off the tracking abilities of such beneficial insects as honeybees. But new lab experiments are the first to confirm that one pollinator, the tobacco hawkmoth, can quickly learn that a pollution-changed scent comes from the jasmine tobacco flower that the insect likes.

Chemical ecologist Markus Knaden and colleagues focused on one pollutant-ozone, the main element in smog. In the lab, his team blew an ozone-changed scent from a tiny tube into a tunnel, with a moth (飞蛾) awaiting at the far end of the tunnel. Usually, when the moth smells the unchanged scent, it flies upwind and uses its long, skinny mouthparts to probe the tube the way that it would a flower. The researchers expected that the changed scent might throw the moth off a little. But the insect wasn’t attracted at all.

In addition to scent, tobacco hawkmoths track flowers visually, so Knaden’s team used the feature, along with a sweet snack, to train the moth to be attracted to a pollution-changed scent. The researchers wrapped a brightly-colored artificial flower around the tube to trick the moth back across the tunnel, despite the unfamiliar scent. And the team added sugar water to the artificial flower. After a moth was given four minutes to taste the sweet stuff, it was attracted to the new smell when sent into the tunnel 15 minutes later, even when neither the sugar water nor the visual signal of the artificial flower was present.

This study focused on only one moth species, but Knaden’s team is now working on planning experiments with other pollinators that are easier to follow than tobacco hawknoths. While he guesses honeybees might also be as adaptable as the moth was, that won’t be true of every pollinator. “The situation can become very bad for insects that are not as clever or cannot see that well. I don’t want the take-home message to be that pollution is not a problem.”

1. What does the underlined word “probe” in paragraph 2 mean?

A．Surround.

B．Favour.

C．Access.

D．Examine.

2. According to the passage, ________.

A．not all moths were attracted to ozone-changed scent as expected

B．the current research conducted by Knaden is pioneering and wide-ranging

C．not all pollinators are adaptable to human-driven changes to their environment

D．the moth didn’t like the new smell without sugar water and artificial flower

3. What’s Knaden’s attitude towards the finding of the study?

A．Positive.

B．Cautious.

C．Unclear.

D．Critical.

4. What does the text mainly talk about?

A．A moth can be rid of the tracking ability to locate its favourite plants.

B．A moth is able to establish a relationship between pollution and scents.

C．A moth may outsmart smog by learning to like pollution-changed scent.

D．A moth is born with an ability to adapt to the changes in the environment.

7 . Mutualism—win-win ecological partnerships perfected over evolutionary time-lengths—is a less-known ecological relationship that is also weak and easily hurt by the effect of a rapidly changing planet.

Bees and flowers are typical examples of mutualism. Some bee tongues are perfectly evolved to tap into certain flowers. By specializing in those plants, the longer-tongued bees reduce competition with insects that can't access those sweet foods.

That mutualistic relationship, however, has been impacted in at least one population of bees and flowers. As certain flowers in Colorado have become rarer due to warming temperatures, the tongues of the bumblebees（大黄蜂）that historically fed on them have become shorter.

Like many of their relatives, bumblebees are on the decline. To find out what's going on, a team of researchers headed to Colorado. The researchers examined bumblebee samples collected on three mountains from 1966 to 1980 and also gathered a fresh set, which they collected in the same places from 2012 to 2014. They performed the task of measuring all the historic and recently caught bees' tongues.

As the team reports in Science, both of the species tongues have declined in length over time. The team found a nearly 25-percent decrease in tongue length between the bees collected decades ago and those living in the same region today.

Next they turned to the flowers. Looking at contemporary and historic botanical data, the scientists confirmed that the number of flowers with short tubes did not increase in large quantities. They found that in response to warmer temperatures, flowers have been moving up the mountains and becoming rarer at lower altitudes. This altitude-climbing effect has ultimately resulted in an approximate loss of millions of flowers.

The findings paint a telling picture: hotter summers caused bumblebees' choice flower species to disappear, forcing them to evolve shorter tongues to tap into the remaining food sources. Then, competition with generalist species, more time and energy needed and a forced reliance on alternative sources all likely contributed to the bees' overall decline.

1. What was the cause of bumblebees' tongues shortening in Colorado?

A．Decrease of certain flowers.	B．Fight within populations.
C．The pollution of their food.	D．Common growth problems.

2. What do we know about the research on bumblebees?

A．Clear results were published.	B．It was based on assumptions.
C．It was carried out for decades.	D．It intended to study bee diseases.

3. Why do flowers in Colorado tend to move up the mountains?

A．For more sunlight.	B．For cooler environment.
C．For more growing space.	D．For defence against insects.

4. What is the text mainly about?

A．A research on bees' tongues.	B．Facts and causes of bees' decline.
C．The relation of flowers and bees.	D．The climate influence on mutualism.

8 . Most of Florida is a flat peninsula (半岛) with water on three sides and houses built as close to the shoreline as possible. For one thing we are more frequently the target of hurricanes than any other state; for another, our geography makes us more easily to be hurt by rising seas.

A news story about climate change in Florida popped up. Historically, scientists believed mangroves (红树林) didn’t live farther north than Cedar Key, in the middle of Florida’s Big Bend. But that’s not the case anymore. Samantha Chapman, a biology professor who’s been studying how Florida’s mangroves have been migrating (迁移), found them up near the St Mary’s River, which forms the border between Florida and Georgia. It seems that they soon be marching through Georgia and becoming a thriving new component of coastal habitats.

But a coastal biologist named Blair Witherington took issue on the matter. The mangroves weren’t spreading into a new territory, he pointed out. They were entering areas that had been classified as saltmarsh (盐沼), where the landscape was dominated by cordgrass. Saltmarsh and mangrove create very different habitats that attract a very different set of animals. “When one community replaces the other, this diversity is lost,” Witherington remarked. Changing the animals’ habitat has the potential to influence the whole food chain, making a widespread difference.

What was driving this? “Mangroves can survive a short freeze, but not a prolonged, hard freeze. By combing through the weather records kept by the state’s orange juice industry, biologists have been able to document that Florida is having fewer prolonged hard freezes than it used to. Then the mangroves have adapted by expanding their range.” Samantha explained.

“They’ve adapted in another way, too. Not only are the mangroves spreading into areas that once were unfriendly to them, but they have also changed their life cycle to speed things up. Normally it takes them about 15 years of growth before they start making seeds. Now, as they get into these marshes, they’re producing seeds when they’ re only a couple of years old,” Samantha said.

The problem with having too many mangroves by the sea is that climate change may overwhelm them. A study by the US Geological Survey said sea level rise could wipe out mangroves all along the Florida coast. So, here’s the question we humans have to consider: Nature is finding ways to adapt to how we’ve changed the climate. What are we doing to adapt to it? Or at least slow it down?

1. What can we learn about the state of Florida?

A．It could be affected by high tides easily.

B．Its geography fuels shipbuilding industry.

C．Its houses are built in a high-lying but flat area.

D．It is often hit by tornadoes and suffers huge losses.

2. What is the news story about Florida’s mangroves?

A．They migrate to warmer regions.

B．They are marching into a new habitat.

C．They form the border between Florida and Georgia.

D．They are introduced into Florida to prevent flooding.

3. Which of the following would Blair Witherington agree with?

A．Saltmarsh is fragile and requires urgent protection.

B．Florida includes a rich diversity of natural habitats.

C．The benefits of the mangroves outweigh their troubles.

D．Everything in the ecosystem is connected complicatedly.

4. What are the 4th and 5th paragraphs mainly about?

A．What mangroves had to face in their habitats.

B．Whether mangroves had influence on other plants.

C．How mangroves adapted to the changing environment.

D．Why mangroves had a different life cycle in marshes.

5. What can we infer from the last paragraph?

A．Human beings are supposed to worship nature.

B．It is urgent to grow more mangroves along coastlines.

C．Measures against mangroves’ migration are far from enough.

D．What we should do to stop the climate change is still up in the air.

9 . Directions: Fill in each blank with a proper word chosen from the box. Each word can be used only once. Note that there is one word more than you need.

A. removed; B. guaranteed; C. quality; D. ranks                 E. threats; F. access; G. long-term; H. unproductive        I. effective; J. overlooking; K. characterize

Coffee’s Climate Crisis

Howard Schultz wants to know if I drink coffee. The Starbucks boss is sitting on a balcony     1     the company’s leafy farm in the Costa Rican province of Alajuela, where I’m told the coffee — harvested and roasted on-site — is a must-try. Like more than 60% of Americans, I drink coffee at least once a day. The Costa Rican blend Schultz pours me has a special taste that mixes citrus and chocolate flavors.

But the future of my cup of Costa Rican Arabica is not     2    , Schultz says. After nearly four decades at Starbucks, he is leaving at the end of June, and in the role of executive chairman for almost 15 months, he has been looking past Starbucks’ day-to-day operations to its     3     challenges and opportunities. Climate change     4     high among them. As temperatures rise and droughts intensify, good coffee will become increasingly difficult to grow and expensive to buy. Since governments are reacting slowly to the problem, companies like Starbucks have stepped in to save themselves, reaching to the bottom of their supply chains to ensure reliable     5     to their product. “Make no mistake,” Schultz tells me, “climate change is going to play a bigger role in affecting the     6     and integrity of coffee.”

This farm, with its verdant vistas and a trickling waterfall, seems far     7     from the rising sea levels, unbearable heat and destructive storms that     8     climate change. But global warming is exactly why Starbucks bought the 600-acre plot in 2013, and why Schultz makes the 3,500-mile trip from Seattle a few times a year as he has done on this March day. The farm is Starbucks’ field laboratory into the     9     posed to coffee by climate change and its testing facility for how it can adapt to the challenge. Schultz hopes that the research here will inform agricultural practices for millions of farmers across the globe, including the ones that supply the company. “We have to be in the soil, growing coffee, to understand firsthand how to fix the situation,” he says. Study after study has laid out the threat climate change poses to the coffee industry. Rising temperatures will bring drought, increase the range of diseases and kill large swaths of the insects that pollinate coffee plants. About half of the land around the world currently used to produce high-quality coffee could be     10     by 2050, according to a recent study in the journal Climatic Change.

10 . He was wandering in a rice field of dreams.     1     After walking a while he lay down in the leaf-shade with a friend, quite hidden. A rest was a good idea, because the wonder-plants went on and on. In fact, they covered the world.

Then Yuan Longping woke up, laughing.     2    . But they still deserved their name of super rice. The leaves were straighter and taller than ordinary, and the grains plumper. They had all the vigor of the wild strain that he and his team had found after much searching and had cross-bred, over careful years, with the domesticated variety.

The figures spoke for themselves.     3    . In Yunnan province more than 17000 kilograms had been produced per hectare. China’s rice crop had risen from 57m tonnes in 1950 to 195m in 2017; from food deficiency, to food security. Higher rice-yields allowed farmers to turn more land to other uses-fruit, vegetables, fishponds-so that people ate more and well.

For this he won the Medal of the Republic, China’s highest, and the World Food Prize. An asteroid was named after him. There was talk of the Nobel, too.     4    . Though he was rich, from his shares in a seed company that used his name, he looked like a peasant, thin as a twig, with his face leathered by sun and his big hands rough from “playing in the mud” all day.

He was far happier in his short-sleeved work-shirts, out in his rice, or stripped off swimming in any wild river he could find, than in a tang suit in some conference hall.

A．Nothing but the continuous development of his beloved country seemed to attract him

B．With his new hybrid rice the annual yield was 20-30% higher, so at least 60m more people could be fed every year.

C．His dreams focused on his people and his country, where all enjoyed food and wealth.

D．All that seemed just smoke to him.

E．The plants were taller than men. Each grain is as big as a peanut.

F．The rice plants he had tended for decades at Anjiang and then Changsha, sowing and nurturing them, visiting daily on his motorbike to inspect them, were not quite there yet.