1 . The colorful anemonefish (海葵鱼), also known as clownfish, possesses a cheerful and carefree image among humans. However, their actual behavior might not always align with the family-friendly portrayal seen in a Pixar film. They can aggressively defend their territory against other anemonefish they perceive as threats.
To investigate how these fish identify group members, a team from Japan conducted two experiments with lab-raised common clownfish that had never encountered any other species.
In the first experiment, researchers introduced different species of anemonefish, distinguishable by the number of white bars on their bodies, into a tank in small cases. They observed that the common clownfish were particularly hostile toward members of their own species that displayed three white bars. These fish fought 80 percent of their specific-targeted fish for up to three seconds. In contrast, invaders from other species, like the orange skunk clownfish with no side bars and a white line along its back, were barely attacked. The two-barred Clarke’s clownfish and three-barred saddleback clownfish were “mildly bullied”, according to the team.
During the second experiment, the researchers exposed a colony of clownfish to various plastic discs. The discs were painted with anemonefish coloration and measured the level of aggression towards these artificial models. Similar to reactions to live fish, models with two bars were less frequently attacked, and those without any bars saw the least aggression. According to study co-author and ecologist Kina Hayashi, the findings “suggest that clownfish is capable of counting the number of bars to recognize the species of the invader”.
The team also found that a rigid hierarchy (社会等级) within clownfish colonies determines which specific fish attack the invader. Earlier studies have shown that the social position of the clownfish is determined by very slight differences in size. This study used fish that had not matured and were in a lab setting, but the team still observed the same size-based hierarchy. The largest clownfish led the charge against the invader.
1. What does the underlined word “hostile” mean in the third paragraph?| A．Unfriendly. | B．Tolerant. | C．Patient. | D．Sympathetic. |
| A．By introducing a new concept. | B．By comparing different clownfish. |
| C．By observing clownfish’ behaviors. | D．By analyzing statistics of previous studies. |
| A．Clownfish can’t reach maturity in a lab setting. |
| B．Skunk clownfish is the most modest clownfish. |
| C．The social position of a clownfish depends on its size. |
| D．Clownfish identify threats by the number of vertical bars. |
| A．Barred and Bullied: Attacks from Anemonefish. |
| B．Clownfish and Conflicts: Strict Social Hierarchies. |
| C．Beyond the Screen: The identification of Clownfish. |
| D．From Lab to Tank: Aggression Among Anemonefish. |
2 . The corn eaten around the world today originated in Mexico nearly 10,000 years ago. From the ancient rituals of the Mayans to modern-day dishes like tortillas, corn is central to culture, cuisine, and identity in this region.
To protect this heritage, Mexico is fighting to phase out genetically modified (GM) U. S. — grow n corn this year. The Mexican government claims that banning GM corn will protect the country’s native corn varieties. Yet the announcement aroused strong objections from the U. S., whose largest annual customer for GM corn is often Mexico. The U. S. claims that the GM ban breaks the trade agreement between the two countries.
Mexico insists that modified seeds threaten Mexico’s agricultural traditions and cultural identity. In the U. S., most corn is grown with seed produced by large companies, which create just a handful of genetically identical corn varieties grown at mass scale. In Mexico, however, seeds come from seed-sharing practices among small-scale farms, which facilitates more diversity and allows farmers to grow corn that ranges widely in color and size.
“Traditional varieties maintain a substantial amount of genetic diversity,” says Jeffrey Ross-Ibarra, an ecologist at the University of California, but he doesn’t think banning GM corn will help preserve these varieties, and points to adec line in small-scale farms as the greater threat to native corn. “If traditional farmers abandon subsistence farming, we’re potentially losing diversity whether that crop is GM or traditionally bred, so economic policy has a much bigger impact on the risk of corn diversity than an adoption of GM corn.” Since Mexico began importing U. S. corn, small-scale farms have been declining.
Mauricio Bellon, a research professor at the Swett Center for Sustainable Foods Systems, believes that while threatened species are often stored in gene banks, the relationship between a farmer and their crop plays a crucial conservation role. “Evolution at scale continues with corn in Mexico through millions of farmers,” says him.
1. Why is Mexico prohibiting GM corn?| A．To safeguard its own types of corn. | B．To reduce the cost of importing corn. |
| C．To get rid of the dependence on the US. | D．To stop the decrease of small-scale farms. |
| A．The technology of farming. | B．The source of corn seeds. |
| C．The ownership of farmland. | D．The relationship between farmers. |
| A．Approval. | B．Concerned. | C．Critical. | D．Tolerant. |
| A．GM corn has negative effects on traditional farms. |
| B．Endangered species are well preserved in gene banks. |
| C．Species diversity contributes to the evolution of species |
| D．Traditional farming practices help in preserving corn varieties. |
3 . The sun near the equator is never-ceasing, bearing down as I lead Elaine, a dark brown horse, through thick bushes. It’s been a long day on horseback. My legs ache and our camp signals across a ridge of ancient folding hills in the Lolldaiga Range of northern Kenya, a mosaic (马赛克) of twisted landscapes and communities.
Suddenly Elaine’s ears flick into alert, and the muscles of her body tense beneath me. Our guide Nicholus stretches out a lean arm toward a bush just meters away. My eyes focus, trying my best to see what the others already have: two amber balls glowing from a shadowed form. It’s a young lion, quick and strong, in the middle of the high grass.
A wild silence hangs between us.
Without the defensive hunting vehicle, I feel completely exposed. Peering into the bush, I’m suspended between wonder and terror, the distance between myself and the Savannah’s most notorious hunter unbelievably small. Usually, I’m the one tracking the lion, camera in hand. Now, the lion shifts in my consciousness from object to subject. I shift, too, strongly aware of the soft flesh of my own body.
Nicholus nods his head in the other direction, a safer distance away. He points to shallow holes in the dust. “Look, this is a big lion, and these are young ones, some cubs,” he says. “Probably a mother.” Pawprints marked the earth, each telling the story of more lions, moving in different directions.
It was time to go.
Horseback safaris are still the most immersive way to view wildlife in Kenya. To journey on horseback is to break down the walls — meant to protect, but also to separate us from the natural world. And as we’re absorbed in the thrill of the experience, we’re vividly reminded of the importance of protecting these wild spaces.
Out here your horse is your translator, responding to the low hiss of a leopard, the soft scent of an elephant herd, the cool morning breeze descending from Mount Kenya’s glacial peaks. Your job is to learn how to listen.
1. Which words can NOT describe my horseback journey?| A．Thrilling. | B．Tiring. | C．Breathtaking. | D．Boring. |
| A．I regretted not having driven a vehicle. |
| B．I felt extremely tense in case of lions’ attack. |
| C．There will be a big battle between lions and us. |
| D．It was out of my expectation to break into a lion’s world. |
| A．Horses are much cheaper than vehicles. |
| B．Visitors will experience the wildlife anytime. |
| C．It is a safe and exciting way to enjoy the wildlife. |
| D．It offers a chance to reconsider the connection between humans and wildlife. |
| A．Find more animals to feed. | B．Ask your horse for translation. |
| C．Feel nature with your heart. | D．Listen to the sound of every animal. |
4 . Do you see a bird right now? Can you hear one chirping? If so, you might be getting a mental health boost. A study recently published in the journal Science found that being in the presence of birds made people feel more positive.
Andrea Mechelli, a psychologist at King’s College London, found himself studying the natural world accidentally. Initially he was searching for answers to why people who lived in cities seemed to tend to suffer mental illness, particularly psychosis. In 2015, he created the smartphone app Urban Mind to search for patterns in users’ environments. “Our first finding is that nature has a very powerful effect,” says Mechelli. He and his colleagues then wondered if some aspects of nature were more beneficial than others. They turned to birds for their ubiquity (普遍存在) in rural and urban environments.
Their latest study included 1,292 participants mainly in the United Kingdom and Europe. For two weeks, participants were prompted to fill out a questionnaire about their surrounding environment and their mental state three times a day. Mechelli performed a statistical analysis that found an obvious improvement in wellbeing when birds were present, even when eliminating other factors like the presence of trees or waterways. The mental health benefit was true both for people who disclosed a depression diagnosis and those without any diagnosed mental health conditions.
Peter James, an environmental health scientist at Harvard, would like to see more data. He found that environmental health studies like these lack diversity. Yet, a psychologist at Trent University in Canada, Lisa Nisbet says, “This kind of study helps us understand how people’s everyday experience with specific elements of nature, such as birds, can be restorative.”
Appreciating birds seems to be a promising avenue for nature-based health and wellbeing interventions. At Mechelli’s clinical practice in London, he focuses on early intervention therapies. He suggests his patients go for walks to observe the trees and plants growing in the city, and the bird fluttering by from branch to branch. “It has no side effects,” he says. “It’s something they could try, and they have nothing to lose.”
1. What can be inferred about Andrea Mechelli’s study?| A．Diverse environments are rewarding only for depressed people. |
| B．The presence of birds is beneficial to mental health. |
| C．Peter James thought highly of Mechelli’s research. |
| D．It was originally targeted at the research on birds. |
| A．Defeating. | B．Identifying. |
| C．Considering. | D．Removing. |
| A．Early intervention shows no significance. |
| B．The access to nature helps people be more confident. |
| C．Nature-based intervention functions well in mental health. |
| D．People’s daily experience is connected with mental problems. |
| A．Use Nature in Supporting Mental Health | B．Get Outside for a Quicker Mental Recovery |
| C．Analyze Data to Make a Good Treatment Plan | D．Turn to Birds for Better Understandings of Humans |
5 . The climate crisis may lead the human race to decrease in size, as mammals (哺乳动物) with smaller bodies appear better able to deal with rising global temperatures, a leading fossil expert said.
Prof Steve Brusatte, a palaeontologist (古生物学家) at the University of Edinburgh, suggested that the way in which other mammals have previously responded to periods of climate change could offer an insight into humans’ future.
He compared the potential situation of people as similar to that of early horses, which became smaller in body size as temperatures rose around 55m years ago, a period called the Paleocene Eocene Thermal Maximum.
Writing in The Rise and Reign of the Mammals, Brusatte notes that animals in warmer parts of the world today are often smaller than those in colder areas, an ecological principle known as Bergmann’s rule. “The reasons are not entirely understood, but it is probably, in part, because smaller animals have a higher surface area compared to their size than bigger animals and can thus better get rid of extra heat” he writes.
Brusatte said that becoming smaller was “a common way that mammals deal with climate change”. He added, “That’s not to say every species of mammal would get smaller, but it seems to be a common survival trick of mammals when temperatures spike pretty quickly, which does raise the question: if temperatures do spike really quickly, might humans dwarf, might humans get smaller? And I think that’s certainly convincing.”
In a recent study, researchers studying human remains over the past million years have also suggested that temperature is a major predictor of body size variation, while scientists studying red deer have said that warmer winters in northern Europe and Scandinavia may lead to the body size of these animals becoming smaller.
However, not all experts agree that rising temperature causes mammals to decease. Prof Adrian Lister, of the Natural History Museum in London, said the relationship shown by the recent human remains study is weak, while the strong relationship between temperature and mammal body size may often result from the availability of food and resources.
Lister doubts whether humans will shrink as the climate heats. “We are not really controlled by natural selection,” he said. “If that was going to happen, you’d need to find large people dying before they could reproduce because of climate warming. That is not happening in today’s world. We wear clothes, we have got heating, we have got air conditioning if it is too hot.”
1. According to the passage, the early horses got smaller in body size .| A．to keep cool | B．to save food |
| C．to keep warm | D．to avoid being killed |
| A．Rise | B．Drop | C．Balance | D．Change |
| A．Every species of mammal would get smaller as the temperature goes up. |
| B．Animals in warmer areas are definitely smaller than those in colder areas. |
| C．Smaller animals have a higher surface area and so they can cool down quickly. |
| D．The change of Mammals’ body size is closely related to their food and other resources. |
| A．Climate Change Causes Natural Disasters. | B．Climate Change Leads to Heated Discussions. |
| C．Climate Change Causes Changes in Body Size. | D．Climate Change Leads to Changed Lifestyle. |
6 . Many people have long believed that bright lights draw, or attract flying insects. But that is not exactly what is going on, a new study suggests.
Researchers believe that artificial lights at night may cause problems with flying insects’ natural navigation systems. As a result, the creatures fly in confusion around porch lamps, street lights and other artificial lights. “Insects have a navigational problem,” said Tyson Hedrick of the University of North Carolina, Chapel Hill. He added, “They’re accustomed to using light as a cue (提示) to know which way is up.”
Insects do not fly directly toward a light source, but actually “tilt their backs toward the light,” said Sam Fabian of Imperial College London. Fabian was a co-writer of the study that appeared recently in Nature Communications. This tilting action would make sense if the strongest light source was in the sky. But in the presence of artificial lights, the result is midair confusion.
For the study, researchers attached very small sensors to moths and dragonflies in a laboratory. They then filmed “motion-capture” video of flight — similar to how filmmakers attach sensors to actors to follow their movements. Researchers also used high-resolution cameras to film insects flying around lights at a field in Costa Rica. Such films permitted researchers to study in detail how dragonflies circle endlessly around light sources, positioning themselves with their backs facing the light. Researchers also documented that some insects fly upside down — and often crash land — in the presence of lights that shine straight upward like search lights. Insect flight was least disrupted by bright lights that shine straight downward, the researchers found.
“For millions of years, insects oriented themselves by sensing that the sky is light, the ground is dark — until people invented artificial lights”, said Avalon Owens of Harvard University.
1. What can we learn from the study?| A．Insects have a navigational problem. |
| B．Artificial lights will make insects confused. |
| C．Not all insects do fly directly toward a light source. |
| D．Small sensors are used to film an insect documentary. |
| A．Insects are unlikely to fly upside down. |
| B．Insects can position themselves facing the light. |
| C．Insects failed to orient themselves because of artificial lights. |
| D．Insect flight was interrupted by downward-shining bright lights. |
| A．Ambiguous. | B．Objective. | C．Optimistic. | D．Indifferent. |
| A．In an advertisement. | B．In a science textbook. |
| C．In a nature magazine. | D．In a news report. |
7 . The Japanese government said it planned to begin the discharge (排放) of slightly radioactive wastewater from the Fukushima Daiichi nuclear plant on Thursday, rejecting calls for a delay from some people in neighboring countries.
An earthquake and tsunami knocked out power at the Fukushima nuclear plant on March 11, 2011, causing meltdowns at three reactors. Tritium (氚) and carbon-14 are, respectively, radioactive forms of hydrogen (氢) and carbon, and are difficult to separate from water. They are widely present in the natural environment, water and even in humans, as they are formed in the Earth’s atmosphere and can enter the water cycle. Both emit very low levels of radiation but can pose a risk if absorbed in large quantities. Water which was used to cool reactor cores as well as rainwater and groundwater that flowed into or near the plant have been contaminated with radioactive substances. Plant operator Tokyo Electric Power, or Tepco, has stored the water in more than 1,000 tanks at the facility but says it is running out of room.
Tepco says it will reduce the concentration (浓度) of nearly all radioactive substances in the wastewater to a safe level with the exception of tritium, an isotope (同位素) of hydrogen. The water will then get diluted (稀释) with seawater so the concentration of tritium is reduced to a safe level before the discharge, according to Tepco. As the water is diluted further in the ocean, the concentration of tritium will almost equal the natural level by 6 miles from the discharge point, which is at the end of an undersea tunnel about six-tenths of a mile from the shoreline, a Tepco official said.
But that hasn’t reassured many of Japan’s neighbors, with officials from China and the Pacific Islands voicing alarm and opposition to the plan. Beijing will take “necessary measures” to safeguard food safety and its people’s health, said Chinese foreign ministry spokesperson Wang Wenbin on Tuesday, adding they “strongly urge the Japanese side to correct its wrongful decision”. Meanwhile, fishing communities in Japan and South Korea worry the wastewater release could mean the end of their livelihoods — with consumers across the region already beginning to quit seafood from Japan and its nearby waters, and some governments even banning imported food from parts of Japan, including Fukushima.
1. The meltdowns at three reactors were caused by ________.| A．the greenhouse effect | B．human behaviour |
| C．climate change | D．natural disasters |
| A．purified | B．reduced | C．polluted | D．operated |
| A．More than 1,000 tanks at the facility can store all the radioactive wastewater. |
| B．The concentration of all radioactive substances will be reduced to a safe level. |
| C．The discharge won’t affect the coastal residents since the discharge point is about 0.6 miles offshore. |
| D．The concentration of tritium will be nearly at the natural level after being diluted further in the ocean. |
| A．people in these areas couldn’t make a profit in the future |
| B．it would threaten people’s physical health and livelihoods |
| C．it would be more difficult to import food from parts of Japan |
| D．the local seafood would be unaffordable for people in these areas |
8 . Colorado’s grays peak rises 14,278 feet above sea level, high enough that trees can’t grow toward the top, though there are plenty of shrubs and rocks. It was in this unforgiving landform that Bev Wedelstedt was unlucky enough to get seriously injured in her left knee.
It was August 2018, and Wedelstedt, 56, was on her way back down the trail with three friends. A storm was brewing, and they were anxious to get off the mountain. When they approached a rocky drop of a couple of feet, Wedelstedt decided to leap. She landed on her left leg. Then she heard the snap. Every step after that was agony (剧痛). Before long, she had to stop. As one friend ran down to get help, a number of other hikers, all strangers, attempted to help Wedelstedt down the narrow trail by walking on either side of her to support her weight, but that proved slow and dangerous. “One man was so close to the edge that I could see rocks falling down from where he stepped on them.” Wedelstedt says.
Finally, one hiker, Matt, asked her, “How do you feel about a fireman’s carry?” Before she knew it, he had lifted her over his shoulder. “Now, I’m not tiny,” says Wedelstedt, a former college basketball star. Matt clearly couldn’t carry her all the way down by himself. So six hikers and one of her friends took turns carrying her while she tried to make light of a difficult situation: “I told them I wanted to meet a lot of guys, but this isn’t the way I wanted to do it.” Three hours and two rock-strewn miles later, this human conveyor belt finally met the medics, who took Wedelstedt to the hospital.
She stayed in hospital for a period time. Now she has mostly recovered from her ill-fated hike, but Wedelstedt knows she’ll never shake one thing from that day: the memory of the band of strangers who came to her rescue. “I’m still in awe.”
1. What made it difficult for Wedelstedt to go downhill?| A．The changing weather. | B．The rocky path. |
| C．The thick bushes. | D．Her broken leg. |
| A．Advancing. | B．Transforming. | C．Freezing. | D．Weakening. |
| A．Only one hiker had firefighting experience. | B．Wedelstedt refused help from the rescuers. |
| C．The medics were unwilling to provide help. | D．The narrow trail slowed down the rescuers. |
| A．Wedelstedt has got a complete recovery. | B．All Wedelstedt’ rescuers were strangers. |
| C．Wedelstedt’s rescue left a deep impression on her. | D．Wedelstedt has benefited a lot from her experience. |
Jiangsu, known for its unique blend of innovation and preservation, is a true treasure. I was
My first stop was Suzhou.
Actually, the mindset of modernization with deep respect for the past isn’t only unique to Suzhou
10 . Artificial intelligence (AI) is showing promise in earthquake prediction, challenging the long-held belief that it is impossible. Researchers at the University of Texas, Austin, have developed an Al algorithm (算法) that correctly predicted 70% of earthquakes a week in advance during a test in China and provided accurate strength calculations for the predicted earthquakes.
The AI was provided with a set of statistical features based on the team’s knowledge of earthquake physics, and then instructed to train itself using a five-year database of earthquake recordings. Once trained, the AI provided its prediction by listening for signs of incoming earthquakes within the background rumblings (轰隆隆) in the Earth.
This work is clearly a milestone in research for AI-driven earthquake prediction. “You don’t see earthquakes coming,” explains Alexandros Savvaidis, a senior research scientist who leads the Texas Seismological Network Program (TexNet). “It’s a matter of milliseconds, and the only thing you can control is how prepared you are. Even with the 70% accuracy (精确度), that’s a huge result and could help decrease economic and human losses and has the potential to remarkably improve earthquake preparation worldwide.”
While it is unknown whether the same approach will work at other locations, the researchers are confident that their AI algorithm could produce more accurate predictions if used in areas with reliable earthquake tracking networks. The next step is to test artificial intelligence in Texas, since UT’s Bureau TexNet has 300 earthquake stations and over six years worth of continuous records, making it an ideal location for these purposes.
Finally, the authors hope to combine the system with physics-based models. This strategy could prove especially important where data is poor or lacking. “That may be a long way to go, but many advances such as this one, taken together, are what moves science forward.” concludes Scott Tinker, the bureau’s director.
1. Which words can best describe the earthquake-predicting technology?| A．Reliable but outdated. | B．Effective but costly. |
| C．Potential and economical. | D．Groundbreaking and promising. |
| A．By identifying data from the satellites. |
| B．By analyzing background sounds in the Earth. |
| C．By modeling data based on earthquake recordings. |
| D．By monitoring changes in the Earth’s magnetic field. |
| A．The ways to reduce losses in earthquakes. |
| B．The importance of preparing for earthquakes. |
| C．The significance of developing the AI prediction. |
| D．The limitation of AI algorithms in earthquake prediction. |
| A．Conducting tests in different locations. |
| B．Applying the AI approach to other fields. |
| C．Building more earthquake stations in Texas. |
| D．Enlarging the database to train the accuracy. |
