1 . A genetic change known as the Himalayan gene has made this breed’s fur extra sensitive to temperature — but also leaves them easy to get certain diseases.
With 73 cat breeds recognized by the International Cat Association, it can be difficult to discern a Ragdoll from a Ragamuffin. Most of us, though, can pick out a Siamese cat. Known for their dark eye masks, nose, and tail — called “points” that stand out against their cream-colored bodies and sparkling blue eyes, the Siamese is one of the world’s easily recognized breeds.
Those trademark points stem from a genetic change known as the Himalayan gene, which was discovered in the breed in 2005. This hidden gene; passed down from both parents, also gives the felines (猫科动物) temperature-sensitive fur that can change color.
In the mother’s body, Siamese kittens develop at temperatures of about 101 Fahrenheit, a cat’s normal temperature. Once born, all-white kittens eventually begin to cool at their extremities (端点), such as their tail, legs, ears , and face. These lower temperatures cause the Himalayan gene to activate the body’s melanin (黑色素), also found in people. That’s why a Siamese cat’s warmer bodies stay light, but their cooler parts become darker as they mature.
“You can see them change,” says Betsy Arnold, a vet who runs a cats-only practice in Rochester, New York, and started breeding Siamese when she was in her teens.
At about two weeks old, Arnold says, dark color begins to spread to their limbs. By about a month old, their final color emerges, which may be one of several varieties, among them blue point, lilac point, chocolate point, and seal point, which has a light, cream-colored coat with dark brown color on its paws, tail, nose, and ears.
1. What may the underlined part in paragraph 2 mean?| A．Take care of those sick cats. | B．Tell the difference between them. |
| C．Take them back to the rescuer center. | D．Evaluate their health conditions. |
| A．It stands out against other cream-colored cats. | B．Its fur is sensitive to the temperature outside. |
| C．It has a genetic change — the Himalayan gene. | D．Its extremities are all dark-colored with blue eyes. |
| A．The color change of a Siamese is a gradual process. | B．An elderly Siamese can change its color. |
| C．A Siamese can only change its color to black. | D．Siamese cats are sensitive to climate change. |
| A．How Siamese Cats Change Their Colors | B．How a Mysterious Gene was Found in Nature |
| C．What Scientists Found in Himalaya | D．Why a Siamese Cat Looks Strange |
2 . Bred to be more sweeter, today’s cherries, bananas and apples taste different than they used — to but not necessarily better. Among fruit farmers, the word “quality” is now routinely used as a standard for “high in sugar”, though firmness, color and size are also considerations. In a recent study about ways to enhance the sweetness of fruit using “molecular (分子的) approaches”, a group of plant scientists wrote that, in general, the sugar content of many fruits are now higher than before owing to continuous selection and breeding. Modern apple varieties, the scientists stressed, were on average sweeter than older ones.
The sweetness of fruit depends not just on how it is bred but also on growing conditions, yield and harvest. The lead researcher, Sugiura, said, “If you could taste an apple harvested 30 years ago, you would feel the difference.” He believed that modern apples are picked so early that even if they are bred for sweetness, they often don’t develop their full character. The fragrance (香味) never develops in fruit that is harvested too early.
Jim Cooper, an apple farmer in England, is regretful to admit the fact that many people will never taste the “strawberry hint” in a really ripe Pearmain, a type of heritage apple. In a way, the rise of consistently sweeter fruit in our lifetimes has been a victory of plant breeding. After all, it’s a rare person who would seek out bitter grapes if they could have sweet ones instead.
But the sweetness of modern fruit is not without its problems, especially for people with diabetes (糖尿病), who have to reduce their intake of higher-sugar fruits. Fruit that is bred sweeter also tends to be lower in the chemicals that make it healthy. Considering health, maybe the real problem with modern fruit is that it has become yet another sweet thing in a world with sugar. Even grapefruits, which used to be quite bitter, are sometimes now as sweet as oranges. If you’ve never tasted a sour cherry, how can you fully appreciate a sweet one?
1. In what aspect is many fruits different from before?| A．Sugar content. | B．Soft skin. | C．Bright color. | D．High yield. |
| A．They are bred too early. | B．They taste so sweet. |
| C．They are losing a good flavor. | D．They need a higher yield. |
| A．Favorable. | B．Critical. | C．Ambiguous. | D．Indifferent. |
| A．It’s a wise choice to breed fruits for sweetness. |
| B．Breeding sweet fruits improves the quality of fruits. |
| C．Some fruits like grapes and cherries taste the same. |
| D．The sweetness of fruits will cause health issues. |
3 . Wild turkeys are a familiar sight throughout New Hampshire, where flocks wander along roadsides and through backyards.
In 1975, Ted Walski, the biologist for New Hampshire Fish and Game, released 25 turkeys from the back of his truck in Walpole, a town in the western part of the state. It was part of a reintroduction effort to bring back a species that had been wiped out in New England before the Civil War, where it used to suffer heavy blows — forests vanished for unknown reasons and people got their own way to hunt.
“Originally, I never thought it would get beyond a few thousand turkeys,” says Walski, who spent nearly 50 years working with the birds before retiring in 2019.
Instead, New Hampshire’s turkey population has exploded beyond all expectations, now around 45,000 animals — the highest since the reintroduction, and probably the most the state can approach. Reintroduction efforts in neighboring states and around the country have created a similar story — there are 70,000 wild turkeys in Maine, up to 50,000 in Vermont, and more than 30,000 in Massachusetts — all of which total up to about six million animals reproducing in all states but Alaska.
So what made the wild turkey one of the most successful wildlife reintroduction programs in American history? Most likely, it’s due to the bird’s surprising and unexpected ability to live among humans. In the suburbs, turkeys can take advantage of edge habitat, like woods and open spaces, and dine on a never-ending buffet of food provided by people — particularly birdseed. Besides, it doesn’t hurt that native predators, such as wolves and cougars, have largely disappeared from most parts of the turkey’s range.
But everyone is not thankful for the New England turkey boom. The infamously bold birds are troublesome, disturbing traffic and pecking at front doors, as well as potentially dangerous. In 2019, a 35-year-old pregnant woman was attacked by turkeys on the streets of Cambridge, Massachusetts — twice. As conflicts between these 20-pound birds and people are on the rise, particularly during the spring breeding season, wildlife officials are trying to cope with the reality that the turkey is here to stay.
1. What had made turkeys extinct in New England before the Civil War?| A．Disappearing forests and unrestricted hunting. |
| B．Ted Walski’s reintroduction policy and its effects. |
| C．Turkeys’ inability to reproduce and coexist with humans. |
| D．Native predators’ occupation of most parts of turkeys’ range. |
| A．Their explosive population is completely out of the control of New Hampshire. |
| B．The number of wild turkeys amounts to around six million in Alaska. |
| C．Their abilities to reproduce fall short of people’s expectations. |
| D．They feed on adequate food from human beings. |
| A．It is urgent to protect wild turkeys from being attacked. |
| B．Turkeys are posing a potential threat to natural environment. |
| C．Nobody appreciates the increase in turkeys due to their evil deeds. |
| D．Measures will be taken to tackle conflicts between turkeys and humans. |
| A．New England witnesses a turkey boom but not all appreciate it. |
| B．The wildlife reintroduction program of wild turkeys is quite successful. |
| C．Wild turkeys’ sharp increase does harm to human beings and environment. |
| D．There is a contradictory relationship between wild turkeys and human beings. |
4 . On Christmas Eve, a team of reindeer (驯鹿) will help Santa Claus deliver gifts to children all around the world. The reindeer, led by their fearless leader Rudolph, won’t be the only ones doing something special. Back in the highest Arctic, their cousins have a remarkable ability changing their eye color.
During the summer months, when the days are long and the sun is bright, reindeer’s tapetum lucidum (荧光膜), a mirror-like layer at the back of their eye, appears golden, which helps bounce the majority of light off the eyes, effectively acting like a pair of natural sunglasses. As winter comes, and the days become shorter and darker, the tapetum lucidum turns blue to absorb more light, allowing reindeer to improve their night vision and see clear in low light conditions.
With these adaptations, reindeer can adapt and thrive in one of the harshest environments on Earth. Unlike humans, reindeer can see well into the shorter Ultra Violet (UV) range. This UV vision enables them to spot food and predators more effectively in the snowy landscape. Lichens, a key part of their winter diet, absorb UV, so they show up dark against UV-reflecting white snow. Wolf and polar bear fur also absorb UV, so instead of disappearing against snow they pop out in high contrast, allowing reindeer to spot potential threats from a distance.
Reindeer change their eyes by adjusting their tapetum lucidum, which is made of collagen fibers. In winter, the collagen fibers become packed tighter, causing the tapetum lucidum to mainly reflect blue light. This change happens when reindeer dilate their pupils (瞳孔). In summer, the reindeer’s pupils return to a smaller size, which helps reindeer reduce the amount of light entering the eye.
But their unique adaptation may hurt them. Today, the increasing use of artificial lighting, especially during the winter months, poses a potential threat to their sensitive eyes. It can make reindeer lose their way, affecting their ability to survive in their challenging environment. So it is crucial for us to be mindful of our use of electricity and make efforts to minimize light pollution to ensure the well-being and survival of these magnificent creatures.
1. What do we know from paragraph 2?| A．The shape of reindeer’s eyes varies with seasons. |
| B．It is difficult for reindeer to live in low light conditions. |
| C．The tapetum lucidum helps reindeer adapt to seasonal changes. |
| D．Reindeer’s eyes appear golden in winter while blue in summer. |
| A．To help them see clear in dark nights. |
| B．To distinguish food of different colors quickly. |
| C．To protect their eyes from harsh sunlight in summer. |
| D．To better locate food and enemies during snowy days. |
| A．Relax. | B．Expand. | C．Narrow. | D．Hide. |
| A．To call on people to protect reindeer from light pollution. |
| B．To show the reasons for the decline in reindeer population. |
| C．To present humans’ great efforts to reduce artificial lighting. |
| D．To prove reindeer’s strong adaptability to harsh environments. |
5 . New animals
In northern Vietnam, in thick forests in the North Annamite Mountains, there is a wildlife park called Vu Quang. In 1986, the area was made an official forest reserve. In 2002, 550 square kilometers of the area were declared a National Park.
The new animals discovered at the park include the Vu Quang ox or Saola, a “slow” deer, a giant muntjac (the world’s largest, in fact), a black deer and a “holy” goat.
The Saola was the first new species of large mammal to be discovered in more than fifty years, so it caused a lot of excitement in the scientific world. It is a strange goat-like creature that looks as if it is somehow related to cattle. It has horns that can be between one and two feet long, and that seem to come out of the animal’s head at slightly different angles.
The creature had hidden safely for generations in the Vu Quang area. But once it was discovered, it was in danger.
| A．That’s why it attracts hunters |
| B．Vu Quang is no ordinary park, though |
| C．Hunters have no respect for new species |
| D．But that’s not all that is unusual about Vu Quang |
| E．Five new species of fish have also been found there |
| F．This was the first time so many new species had been found in this area |
| G．That’s why it is called “Saola”, meaning “spinning wheel posts” in Vietnamese |
6 . It turns out our plants are just like us in some ways. We turn to medicines to relieve a minor flu or headache, and plants too have their ways of self-medicating. They protect themselves from environmental hazards like insects, drought and heat by producing salicylic acid (水杨酸). It is responsible for the anti-inflammatory action of aspirin, a drug which has been used by humans for centuries to counter pain and inflammation.
Researchers have found that plants’ salicylic acid, which is produced in chloroplasts (叶绿体), is usually generated in response to the stress caused by climate change. “It’s like plants use a painkiller for aches and pains, just like we do,” said plant biologist Wilhelmina van de ven from the University of California, River-side (U. C. R)
“We’d like to be able to use the finding to improve crop resistance (作物抗性),” said U. C. R.plant geneticist Jin-Zheng Wang. “That will be crucial for the food supply in our increasingly hot, bright world.”
Human skin produces ROS (Reactive oxygen species) (活性氧) in the absence of sunscreen. This causes freckles and burns. Similarly, environmental stresses result in the formation of ROS in plants which, at high levels, can cause death.
At low levels, however, ROS serves an essential function in plant cells. “ROS is a double-edged sword,” said Wang. “At non-lethal levels, ROS are like an emergency call to action, enabling the production of protective hormones ( 激素) such as salicylic acid.” The acid then acts to protect the plants’ chloroplasts, known to be the site of photosynthesis.
“With climate change, things like salicylic acid: helping plants stand up to stresses have become more common. So, being able to increase plants’ ability to produce it represents a step forward in challenging the impacts of climate change on everyday life,” said Katayoon Dehesh, UCR professor of molecular biochemistry.
“Those impacts go beyond our food. Plants being in trouble are a sign of what the future holds for us,” she continued. “Plants clean our air by removing the carbon dioxide from it while also offering us shade, and providing habitats for numerous animals. For humankind, the benefits of boosting plants’ ability to survive are becoming increasingly essential.”
1. What is the main function of salicylic acid in plants?| A．To secure plants. | B．To produce chloroplasts. |
| C．To relieve pain and inflammation. | D．To generate hormones. |
| A．Lack of sunscreen. | B．Chloroplastic acid. |
| C．Environmental stresses. | D．Use of Photosynthesis. |
| A．To explore the history and significance of aspirin in human medicine. |
| B．To invent a device that can make plants do self-medicating. |
| C．To compare the differences between plants and humans in self-medicating. |
| D．To improve crop resistance by increasing plants’ ability to produce salicylic acid. |
| A．Plants can be improved to resist environmental hazards. |
| B．Plants produce their own aspirin to cope with stress. |
| C．Plants and humans share some common features and needs. |
| D．Plants contribute to the well-being of humans and animals. |
7 . It was a typical summer day in my small town, with the sun shining and the sky clear. I was sitting on my porch, enjoying the peaceful view of the rolling hills and the calm lake, when suddenly a strong wind blew in from the west. The peaceful sky turned dark as a storm approached.
I went inside, grabbing my raincoat and heading to the barn to secure the animals. The cows were nervous, sensing the approaching storm. I quickly tied them up and ran back to the house, just as the rain started to pour down. The wind was howling and the rain was pounding against the windows. Lightning and thunder followed, making the atmosphere even more electric. I sat by the window, watching the raging storm and praying that everything would be okay.
After what seemed like hours, but was only a few minutes, the storm passed. The clouds moved away, revealing a bright and sunny sky. I walked outside, taking in the fresh air and surveying the damage. The trees were bent over and some branches had been blown off. Our vegetable garden was flooded, but other than that, everything seemed to be fine. I breathed a sigh of relief as I realized that no serious damage had been done.
That evening, as I sat by the fireplace with a cup of hot coffee, I reflected on the experience. It reminded me that nature can be both powerful and unpredictable, but that we must persevere and adapt to whatever it throws at us. The next morning, as I watched the sun rise over the now-calm landscape, I felt a sense of pride knowing that my family and I had weathered the storm together.
1. What does the word “weathered” mean in the last paragraph?| A．enjoyed | B．survived | C．forecasted | D．changed |
| A．Angry | B．Relieved | C．Scared | D．Sad |
| A．Problem and solution | B．Cause and effect |
| C．in order time | D．by Comparison |
| A．The author explains how to prepare for and cope with a storm. |
| B．The author describes how a storm ruined his day and his garden. |
| C．The author compares and contrasts the different weather conditions in his town. |
| D．The author recounts how he and his family withstood a sudden storm and learned a lesson from it. |
8 . “I like pigs,” Winston Churchill supposedly once said. “Dogs look up to us. Cats look down on us. Pigs treat us as equals.” Whether Churchill’s contemporary George Orwell also liked pigs is less clear. But he, too, surely saw something in them that was lacking in many domestic (驯养的) animals, for it was they who ended up running the show in his novel, Animal Farm. Pigs, then, are intelligent social creatures.
And, like all animals, they sometimes fight. Some pigs tend to be attackers; others tend to be victims. Who is what depends largely on weight. Among pigs, pounds mean power. The attacker might bite, kick or push the victim. Most conflicts end in seconds, but some last a minute or two.
In most animal species fights would be like that. However, many of the conflicts among pigs Dr Norscia, a biologist, observed had interested parties beyond the fighters. He therefore wanted to understand the role of these bystanders in solving conflicts—and what this says about pigs’ cognitive (认知的) abilities.
Since there was usually not enough time for a bystander pig to become involved in the heat of a conflict, though this did occur, Dr Norscia looked at what happened in the three minutes immediately following a fight. Sometimes, he found, the fighters reconciled with each other on their own. The more distantly related the fighters were, the more frequently this happened. Dr Norscia guessed that relations between close relatives are more secure to start with, so rebuilding friendly relations rapidly is less necessary for them.
On other occasions, however, a third pig stepped in. Sometimes this bystander interacted with the attacker, which reduced the number of attacks coming after. Sometimes, the bystander interacted with the victim. This appeared to calm the victim down, for it reduced anxiety-related behavior.
Social intelligence need not, though, be entirely selfless. Pigs are more likely to step in after a conflict if they are closely related to either the attacker or the victim. This is probably an example of kin selection (亲属选择), which favors the development of behavior.
1. Why are Churchill and Orwell mentioned at the beginning?| A．To show their preference for pigs. | B．To add some related backgrounds. |
| C．To introduce the topic of the text. | D．To present their attitude to animals. |
| A．They aim to show power. | B．They have audiences. |
| C．They last a little bit longer. | D．They happen more often. |
| A．Caught up. | B．Kept in touch. | C．Made up. | D．Changed in tune. |
| A．Offering comfort to victim pigs. | B．Forming special bonds with strangers. |
| C．Sticking to their behavior. | D．Caring for others with selfless devotion. |
9 . Conifers (针叶树) are generally better than broad-leaved trees at purifying air from pollutants. But deciduous (落叶的) trees may be better at taking in particle-bound pollution. A new study led by the University of Gothenburg shows that the best trees for air purification depend on the type of pollutants involved.
Trees and other greener in cities provide many benefits that are important for the well-being of residents. Leaves and needled on trees filter air pollutants and reduce exposure to poisonous substance in the air. But which trees purify the air most effectively? Researchers from the University of Gothenburg have collected leaves and needle from eleven different trees growing in the same place in the Gothenburg Botanical Garden (GBG) to analyse which cub-stances they have absorbed.
“This tree collection provided a unique opportunity to test many different species of trees with similar environmental conditions and exposure to air pollutants,” said Jenny Klingberg, a researcher of the GBG
A total of 32 different pollutants were analysed, some of which are bound to articles of various sizes. Others are gaseous. This project has focused on paths (多环芳烃). In cities, traffic is the biggest source of these pollutants, which are released due to incomplete burning in engines.
“Our analysis show that different species of trees have different abilities to absorb air pollutants. Conifers generally absorb morn gaseous paths than broad-leaved trees. Another advantage of conifers is that they also act as air purifies in winter, when air pollution is usually at its highest,” said Jenny Klingberg.
“This study contributes to improving our understanding of the ability of trees to clean the air and which species are best at absorbing air pollutants,” said Jenny Klingberg. This known-edge is important for urban planning when designing sustainable cities. While trees and green-era can contribute to better air quality in cities, at the end of the day, the most important measure is to reduce emissions.
1. Which is the determining factor in choosing the most suitable tries to purify air?| A．Air quality. | B．Geographical location. | C．The height of plants. | D．The kind of pollutants. |
| A．To compare their shapes. | B．To create a tree collection. |
| C．To figure out what they absorb. | D．To display them on exhibition. |
| A．Fuel vehicle’s. | B．Electric engines. | C．Traffic accidents. | D．Complete burning. |
| A．Decreasing emissions. | B．Planting more conifers. |
| C．Raising public awareness. | D．Designing sustainable cities. |
10 . Teen Eco-Art Exhibition
Young artists share your artwork and viewpoints on our environment in the Teen Eco-Art Exhibition this Spring!
Submission is open to artiste from Grades 11-12 who reside in West Vancouver or attend a West Vancouver secondary school.
Submissions will be reviewed by a Selection Committee. Artwork will be assessed on creative use of materials and expression of the theme.
Submission criteria (标准)
•Artwork addressing environmental themes such as clean water, climate change, sustainability, conservation, pollution, etc.
•Artwork created primarily from sustainable, repurposed, recycled materials. Other media such as paint, photography, paper, etc. can be used in combination with repurposed materials.
•Size. Wall-mounled (固定在墙上的) artwork: no larger than 36''×36''. Sculpture: no larger than l'5''×1'5''×1'5''.
•Artwork should be exhibition ready. Wall-mounted artwork should have hanging wire, D-rings or hangers. Sculptures should be able to stand on their own.
Artist statement: clear and brief, 100-200 word statement regarding your art practice and the concept/ theme of the work being considered.
How to submit
Complete the submission form & upload the required materials.
Submission close
March 25, 6 pm.
Results
Artists will be notified by April 6.
Exhibition location
West Vancouver Memorial Library, 1950 Marine Dr.
Exhibition Dates
April 15-May 29.
If you have any questions please contact Gallery Coordinator Steven Snider at steven. wvcac@shaw. ca. We look forward to seeing your artwork!
1. What do we know about the event?| A．It is open to artists of all ages. |
| B．It welcomes half-finished art pieces. |
| C．It is looking for creative works from students. |
| D．It disapproves of works with artists’ statements. |
| A．It should be larger than 36''×36''. |
| B．It should be able to stand on its own. |
| C．It should avoid repurposed materials. |
| D．It should highlight environmental problems. |
| A．March 25. | B．April 6. | C．April 15. | D．May 29. |
