1 . Until recently, gravitational waves could have been the stuff of Einstein’s imagination. Before they were detected, these waves in space time existed only in the physicist’s general theory of relativity, as far as scientists knew. Now, researchers are on the hunt for more ways to detect the waves. “The study of gravitational waves is booming,” says astrophysicist Karan Jani of Vanderbilt University in Nashville. “This is just remarkable. No field I can think of in fundamental physics has seen progress this fast.”
Just as light comes in a variety of wavelengths, so do gravitational waves. Different wave lengths point to different types of origins of the universe and require different kinds of detectors. Gravitational waves with wavelengths of a few thousand kilometers—like those detected by the United States, Italy and Japan—come mostly from pairs of black holes 10 or so times the mass of the sun, or from collisions of dense cosmic blocks called neutron stars (中子星). These detectors could also spot waves from certain types of exploding stars and rapidly moving neutron stars.
In contrast, huge waves that span light-years are thought to be created by orbiting pairs of bigger black holes with masses billions of times that of the sun. In June, scientists reported the first strong evidence of these types of waves by turning the entire galaxy (星系) into a detector, watching how the waves make slight changes to the timing of regular blinks from neutron stars throughout the Milky Way.
Physicists now hope to dive into a vast, cosmic ocean of gravitational waves of all sorts of sizes. These waves could reveal new details about the secret lives of exotic objects such as black holes and unknown parts of the universe.
Physicist Jason Hogan of Stanford University thinks there are still a lot of gaps in the coverage of wavelengths. “But it makes sense to cover all the bases. Who knows what else we may find?” he says. The search for capturing the full complement of the universe’s gravitational waves exactly could take observatories out into the moon, to the atomic area and elsewhere.
1. What does Karan Jani think of the current study on gravitational waves?| A．It is rapid and pioneering. |
| B．It is slow but steadily increasing. |
| C．It is interrupted due to limited detectors. |
| D．It is progressing as fast as any other field. |
| A．The creation of different kinds of detectors. |
| B．Collisions of planets outside the solar system. |
| C．The presence of light in different wavelengths. |
| D．Activities involving black holes and neutron stars. |
| A．By analyzing sunlight. |
| B．By locating the new galaxy. |
| C．By using the whole galaxy as a tool. |
| D．By observing the sun’s regular movement. |
| A．It’ll exclude the atomic field. |
| B．It’ll focus exactly on the mapping of the galaxy. |
| C．It’ll require prioritizing certain wavelengths on the moon. |
| D．It’ll explore potential places to detect gravitational waves. |
2 . 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. |
Alexis Langlois, who manages a large farm, heard her neighbor crazily knocking on her front door on a Monday afternoon.
“There’s an emergency”, Amber Countryman yelled. “The horses are stuck in the water.” Langlois was struck with “absolute panic”. She threw on her winter boots — without socks — and rushed toward the small pond on the 80-acre property. She was surprised by what she saw: four horses were in the water up to their necks in 10 feet of ice water.
She immediately called 911.While waiting for help to arrive, “people just started showing up,” she said. “Neighbors were pouring in. People came with ropes, chainsaws, shovels and pick axes.”
“I grabbed a bunch of supplies,” said Countryman, whose two teenagers and their friend also as sited with the effort.
“It was-8℃that day,” she said, adding that she brought out handwarmers and water for the helpers.
Everyone was determined to get the horses out of the pond — which is about 15feetwide.
Beneath a six-inch layer of ice, the water was “just barely above freezing”, said Chris Yerkes, the South Kalispell Fire Department chief who rushed to the pond with about a dozen volunteer personnel.
When the firefighters arrived, neighbors had already attempted to pave a path through the ice toward the edge of the pond using pick axes, sledgehammers and shovels, and “we continued with that effort.” Yerkes said. Unfortunately, “as we got closer to the edge, we realized there was about three to four inches of mud.”
The thick layer of mud — which the rescuers couldn’t cut through — blocked the horses from climbing out. Firefighters enlisted additional support from Flathead County Animal Control, as well as staff from local equestrian organization Rebecca Farm.
“There had to have been at least 60 people here,” Langlois said. “It was very swift action on everybody’s part.”
注意：
1.续写词数应为150左右；
2.请按如下格式在答题卡的相应位置作答。
Paragraph 1
It took nearly two hours to find a workable solution that could bring all four horses to safety.
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Paragraph 2
To get the horses out, they used a powerful tractor (拖拉机) to get the animals out of the mud and ropes to pull them over the edge.
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4 . “You should get a cat, ”my therapist(治疗专家)said. “A cat?” I couldn’t even look after myself. . I took a deep breath and carefully considered the idea of welcoming a feline (猫科的)friend into my life. This seemed like too easy a fix for the fact that I couldn’t leave the house without bursting into tears.
When my partner and I found Cinnamon, her adoption profile made her out as the perfect kitten. We filled out the paperwork and prepared for her arrival.
When she came home, it became increasingly obvious that Cinnamon didn’t understand “no”, “stop it” or “don’t do that”. She was the worst cat I’ve ever owned. I was beginning to doubt my therapist’s advice.
After visiting our vet, she concluded that Cinnamon just wanted our attention. She fought tooth and nail to get a bite of our meals. She’d fearlessly lick sharp knives when left unattended for a split second. Cinnamon stole my heart with her bravery and kept me busier than I’d ever expected.
We decided to start taking her for walks. I could barely leave the house before, but my heart couldn’t say no to Cinnamon. Cinnamon showed me what bravery looked like. She didn’t stop to consider every possible outcome of a situation; she simply went for it. If there was a dog at a park, she would run toward it. She jumped without knowing where she would land. She loved adventure. I found myself mirroring her behavior after a while, jumping out of bed without a second thought. I began to find the motivation to get out of bed in the morning.
Cinnamon unfortunately passed away after a medical accident. I’m no stranger to sadness or grief, but losing my pet so suddenly was the most confusing emotional experience I’ve had to date. She no longer wakes me up at 5 am begging for breakfast, but she’s still the reason I get up every morning.
Our time is often cut unpredictably, unmistakably short. It would be a shame to live life being anything less than brave and adventurous.
1. Why did the author’s therapist recommend that she get a cat?| A．To learn how to interact with animals. | B．To help the author fill up her spare time; |
| C．To solve the author’s fear of going out. | D．To distract the author’s attention from her pain. |
| A．Thrilled. | B．Amazed. | C．Pleased. | D．Disappointed. |
| A．Walking Cinnamon outdoors became an adventure for the author. |
| B．The author was positively affected by Cinnamon’s courageous behavior. |
| C．Cinnamon loved going outside and took consequences into consideration. |
| D．The author decided to take Cinnamon outside as she was too troublesome to stay in. |
| A．Life is short and unpredictable. | B．The loss of a pet can be painful. |
| C．We should have the courage to take risks. | D．Animal-assisted therapy is the best cure for mental illness. |
5 . Ekaterina Sky is a wildlife conservation (保护)artist. She began her art journey at the School of Fine Arts in Yaroslavl, Russia. There, she completed a fine arts program, which gave her the background she needed to become a conservation artist. She also received a scholarship to the Art School of Museum of Tel-Aviv. There, she expanded upon her knowledge and skills, learning to create her own unique style. She combined her love for animals and art to create the works we see today.
Ekaterina painted pictures at wildlife reserves and rescue centers, in high schools and in visitors’centers. She painted a piece for the Burning Man festival, choosing to paint primates(灵长类动物的)eyes since they are closely related to humans. This piece gave her the confidence to start a world tour, as she had never painted a picture that size before.
Ekaterina went on a tour to different countries worldwide, painting pictures of various endangered species. She hoped that her paintings would encourage viewers to look deeply into their own lifestyles and question how they might harm animals. She said, “We all can make a difference if we look at ourselves as a small piece of a greater whole.”
With each picture, she made the audience look directly into the animals’ eyes. She painted pictures to encourage people to show more compassion and care to animals and raise awareness of the importance of efforts in wildlife conservation. “As I believe, we connect through our eyes, which are windows into our soul, and I believe that when we get to meet someone’s soul, we don’t have a heart to hurt them,” she said.
1. What does paragraph 1 mainly tell us about Ekaterina Sky?| A．Her art works. | B．Her unique drawing skills. |
| C．Her love for animals. | D．Her road to a conservation artist. |
| A．The painting gave her confidence. | B．Primates are closely related to humans. |
| C．She’d like to make more money. | D．She wanted to expand on her skills. |
| A．Pity. | B．Blame. | C．Motivation. | D．Gratefulness. |
| A．Reducing garbage thrown by tourists. | B．Introducing various animals worldwide. |
| C．Drawing attention to endangered animals. | D．Advertising the school she graduated from. |
6 . Antarctic blue whales have been perceived again in the sub-Antarctic island of South Georgia. An international-team of researchers discovered the animals five decades after whaling (捕鲸业) nearly caused them to disappear forever. “The ocean resources at South Georgia were heavily developed during the early 20th-century industrial whaling,” says lead author Susannah Calderan, an ecologist with the Scottish Association for Marine Science.
Antarctic blue whales were plentiful in the area until whaling began there in 1904, kicking off the beginning of industrial whaling in the Southern Ocean. While hunters originally focused on species that could be easily caught, like the humpback whale, the focus quickly moved to the blue whale. Between 1904 and 1973, 345,775 Antarctic blue whales were killed in the Southern hemisphere (半球）and in the northern Indian Ocean. Around South Georgia, blue whale catches were reported year-round without stopping. Between 1904 and 1971, industrial whaling caused 42, 698 blue whales’ death, Blue whales almost disappeared in these areas.
Researchers studied all Antarctic blue whale data from the last three decades. They examined sightings (目睹)from scientific surveys collected by observers on ships, as well as opportunistic sightings reported by seamen and ship passengers to the South Georgia. They also examined acoustic(声音的）recordings of blue whale.
They found that whale surveys from ships off South Georgia resulted in just one blue whale sighting between 1998 and 2018. But more recent surveys suggest better news. A survey in February of 2020 found nearly 60 blue whale sightings, and several acoustic detections (探测).A total of 41 blue whales have been recognized through photos from South Georgia between 2011 and 2020.
“Their return is very meaningful, as it was widely thought that blue whales at South Georgia might have been hunted beyond a point where they could recover, and might never be seen again in great numbers at South Georgia,” Calderan says. “Our research shows that, populations can recover even from very low levels if they’re given enough protection.”
1. What does the underlined word “perceived” in paragraph 1 mean?| A．Kept. | B．Found. | C．Hunted. | D．Destroyed. |
| A．The development of industrial whaling. |
| B．The cause of blue whales’ disappearance. |
| C．The wide spread of blue whales in the past. |
| D．The tricks of catching blue whales easily. |
| A．There is an increasing return of blue whales. |
| B．Blue whales are in a more dangerous situation. |
| C．More and more people like watching blue whales. |
| D．South Georgia is a good place to watch blue whales. |
| A．The risk of killing whales at higher rates. |
| B．The sign of Antarctic blue whales’ return. |
| C．The way of protecting Antarctic blue whales. |
| D．The effect of the great loss of ocean resources. |
7 . Western monarch butterflies(帝王蝶) spend their winters on the central California coast. A few months later, they produce young in the Central Valley and as far north and east as Idaho. But where they go in between remains an open question to biologists. Therefore, a group of biologists call on anyone who spots a monarch north of Santa Barbara this spring to get a quick shot and email them the photo with a date and a location.
“Something’s going on in early spring,” said Cheryl Schultz, a professor at Washington State University Vancouver. Winter survival isn’t the problem in the short term, but they don’t know whether the monarchs are not making it to producing places, not finding plants to feed themselves along the way, she said.
The Western monarch population stood in the millions in the 1980s. In 2017, an annual count found 200,000 butterflies. In 2018, the number fell to about 30,000 — a figure that held steady last year. The monarchs’ decline is part of a larger trend among dozens of butterfly species in the West. What exactly caused the decline? Biologists attach it to a variety of reasons. Many chemicals are sprayed on the milkweed monarchs will feed on. Climate change also plays a role in challenges facing monarchs. Yet, they’re not nearly as threatening as those leading to loss of their living room. Farms used to have rough borders that were grounds for the plants monarchs love and live in. However, newly applied practices pushed crops to the edge of fields.
“Butterflies often have good years and bad. We do think there’s potential to turn the situation around,” Dr. Schultz said. And she said she saw two reasons for that. First, the population decline seen in 2017-2018 wasn’t repeated last year. And second, she’s seen butterfly populations recover before.
1. Why do the biologists need the public’s help?| A．To confirm monarchs’ producing places. |
| B．To find how monarchs survive the winter. |
| C．To address the unknown about monarchs. |
| D．To know the distance that monarchs cover. |
| A．New farming practices. | B．Lack of healthy food. |
| C．Wide use of chemicals. | D．Severe climate change. |
| A．Doubtful. | B．Positive. | C．Worried. | D．Cautious. |
| A．What Is Happening to the Monarchs | B．Why the Monarchs Are Flying Away |
| C．Where All the Monarchs Have Gone | D．How the Monarchs Adapt to Nature |
8 . California’s Pacific Grove Monarch Sanctuary(保护区) didn’t have a single monarch butterfly(帝王蝶) sighting last year, so no one knew what to expect for this year’s migration(迁徙). The pleasant surprise, according to SFGate :“The butterflies are back in town”, more than 13,700 of them , per the sanctuary’s count as of November 20,2021.What’s more , the high point of the overwintering season —which runs from October through February—is not even set to hit for several more weeks.
The butterflies typically head west from the Rocky Mountains each year to spend the winter along the Pacific coast; on the other side of the country , butterflies from the East Coast and Canada head to Mexico before the cold weather hits. The population decline(下降)over the years has been noticeable : For example , between 4 million and 10 million butterflies spent the winter in the Golden State in the 1980s, though by the late 1990s that number fell to just over 1 million. By 20I8, the butterflies numbered about 30,000, and last year , there were only about 2,000 seen across the California coast.
Researchers believe different factors have led to the butterflies’ population decline over the years, including climate change, use of pesticides, and loss of living space. And recent Wildfires in California have exacerbated the situation. Scientists say the public can help by planting milkweed ( the butterflies lay their eggs on the plant and their young feed on it; cutting down on pesticide use; and helping observe them.
Still , even though last year’s numbers were worrying, some experts say it may not be as terrible as it seems. David James, an entomologist at Washington State University, tells SFGate that the butterflies seem to be adaptable(能适应的), based on a recent study he led, and that he’s “ confident ” they’ll avoid extinction. Xerces Society conservation biologist Emma Pelton agrees, saying that “ We can make a difference. There is still time to act. ”
1. What did SFGate find surprising about the butterflies ?| A．Their growing number. | B．The time when they migrate. |
| C．The places they head to. | D．Their shorter overwintering period. |
| A．The butterflies prefer heading to Mexico. |
| B．The population of the butterflies has fallen for years. |
| C．The living space of the butterflies has been badly damaged. |
| D．The butterflies have difficulty adapting to new environments. |
| A．Worsened. | B．Covered. | C．Changed. | D．Saved. |
| A．They are too weak to migrate far. |
| B．They will be widely protected soon. |
| C．They can avoid the danger of extinction. |
| D．They make him worry about our Earth’s future. |
A group of frogs were traveling through the woods, and two of them
At first, both of the two frogs didn't care their words and tried
The other frog continued to jump as hard as he could. Once again，the crowd of frogs shouted at him to stop the pain and just die. He jumped even
This story teaches us two lessons: There is power of life and death in the tongue. Well-meant words can help people in trouble. But, evil words sometimes can kill them. Be careful of
Remember the power of words. Anyone can speak words
10 . In a remote corner of Brazil's Amazon tropical（热带的）rainforest, researchers have spent decades catching and measuring birds. Over 40 years, dozens of Amazonian bird species have declined in mass（质量）. Many species have lost nearly 2% of their average body weight each decade, researchers report November 12 in Science Advances. Some species have grown longer wings. The changes could help birds stay cool in a hotter, more changeable climate, the researchers say.
"Climate change isn't something of the future. It has been happening and has effects we haven't thought of," says Ben Winger, an ornithologist（鸟类专家）at the University of Michigan, who wasn't involved in the research but has documented similar shrinkage（缩水）in migratory birds.
To see if non-migratory birds have also been shrinking, Jirinec and colleagues analyzed data collected from 1979 to 2019 in a remote region in the Amazon that spans 43km. The data include over 11,000 individual birds of 77 species as well as climate for the region.
All species declined in mass over this period, the researchers found. Species lost from about 0.1% to nearly 2% of their average body weight each decade. The motmot, for example, shrunk from 133g to about 127g over the study period.
These changes coincided with an overall increase in the average temperature of 1℃ in the wet season and 1.65%℃ in the dry season. Birds' mass decreased the most in a year or two after especially hot and dry seasons, which tracks with the idea that birds are getting smaller to deal with heat stress.
Wing length also grew for 61 species, with a maximum increase of 1% per decade. Jirinec thinks longer wings make for more efficient, and thus cooler, fliers.
"The Amazon rainforest is mysterious, remote and full of biodiversity," Jirined says. "This study suggests that even in places like this, far removed from civilization, you can see signatures of climate change."
1. What changes have happened to Amazonian birds over 40 years?| A．They have lost weight. | B．They have grown prettier. |
| C．They have become fewer. un | D．They have become larger. |
| A．Contrasted with. | B．Compared with. | C．Corresponded to | D．Contributed to. |
| A．Climate change | B．Food shortage. | C．Massive hunting | D．Scientific research |
| A．Researchers measuring birds in Amazon | B．Climate change shrinking tropical birds |
| C．Longer wings improving flying efficiency | D．Human activities damaging Amazon rainforest |
