相关试卷

The research began with what they see in daily life: in environments like crosswalks where people walk straight toward opposite directions, stable paths form naturally. But in spaces like airport terminals (航站楼) where people move at various angles, chaos usually wins. To understand why, mathematician Karol Bacik and his colleagues created mathematical models that study crowd movement like flowing water, looking at different walking angles and how people avoid bumping into each other. Based on these models, they predicted that when people' walking directions spread apart beyond a certain critical angle, the orderly lane formation would break down into disorder.

The research team then tested their idea in a lab-designed crosswalk. Volunteers wearing uniquely coded hats walked across a pretended intersection (十字路口) while overhead cameras tracked their movements. The team varied starting points and walking angles across hundreds of trials, mapping how crowds flowed or clashed. By analyzing thousands of crossings, the team confirmed their prediction — when the average walking direction went beyond 13 degrees, orderly lines collapse into inefficient, potentially dangerous disorder.

"This isn't just about math — it's about real-world safety," explains Bacik. "A shopping mall designed with this 13-degree rule in mind could prevent dangerous crowding, while subway stations might arrange exits to naturally guide people into efficient paths."

The implications extend beyond urban design. Emergency planners could use these findings to design better escape routes, and Al systems might better predict crowd flows in smart cities. As Bacik's team prepares to test their model in real life, one thing is clear: even in something as ordinary as walking, hidden patterns govern our behavior — and science is just beginning to understand them. Moreover, this study transforms an everyday observation into measurable facts, proving once again that mathematics can reveal order in the seeming chaos of everyday life.

Once we assign people or ourselves to a group, several psychological effects take hold. First of all, the group members assume an identity. A label is placed on them, which over time achieves a level of permanency. For example, if you decide yourself as belonging to the "I'm really not creative" group, you tend to view yourself as primarily and permanently uncreative. The longer this belief lasts, the harder it is to change.

Moreover, groups provide us with a false sense of comfort. By joining the "I'm not creative" group, we also conveniently protect ourselves from moving beyond the borders of that group into new and often unfamiliar areas. Like birds that hesitate to leave their cages even when the door is open, we eschew the desire to get out of our comfort zone—not because we can't, but because we won't. There are not just many like-minded people in the group, but it offers a safe environment to work and play.

But the problem doesn't end there. There is a tsunami of books and articles that use language such as the following: "Creative people are individuals like Leonardo, Edison, Picasso, or Einstein who have changed our culture in some important respects" and "Creative people are the ones who get ahead in their jobs, start new businesses, invent products... paint pictures, and make things of beauty." When reading these statements, we automatically assign ourselves to that "other group", knowing that we can never measure up.

However, as psychological research has convincingly demonstrated, creativity is not exclusive to a select few; it is a birthright shared by everyone. So, be mindful of what you read. Sometimes, others may be putting you in a box without your knowing.

Bees, like humans, breathe out water into the air. The more active the bees, the more wetness they put in the air. Sudden cold worsens this: each time my grandson rushed in from the snow, our heater struggled — the bees' energy rewarming forces them to release more wet air. I learned to minimize hive checks after mid-fall. Checking inside interrupts their winter preparations — closing cracks between the boxes and adjusting airflow. Now, I listen with a simple tool to listen for activity instead.

Feeding syrup (糖浆) late also backfires. Sugar syrup must be thickened to between 14% and 21% wetness. Any wetness beyond that percentage must be released into the hive as bees process their food, breathing out extra water. My solution? Ensure hives save enough honey by fall's end. I keep spare beehives in low temperature, transferring them if stores run low. Winter bees — "fat bees" packed with nutrients — handle cold better, their food processing drier.

Yet there's no universal fix. My Pacific Northwest strategies — like tipping hives slightly for water runoff — might fail elsewhere. One truth holds: bees teach patience. Every misstep (like tapping hives "just to check") carries consequences. Now, I journal successes and failures, adapting as my buzzing mentors (导师) demand.

Last winter, all five hives survived. Opening them this spring, I found lively groups — no deaths, just the steady sound of survival. Beekeeping isn't about control, but partnership. Sometimes, the wisest step is stepping back.

How are courses graded?

Your course grade is calculated out of 300 points. The minimum score required to pass and become qualified for college credit is an overall course grade of 70%. To qualify for academic honors, you need an average score of 261. You can earn points from lesson quizzes (about 30%), final exams (about 50%) and course assignments (about 20%). Check the course guidebook to see a full breakdown of the point distribution for each course.

Can I test out of material I already know?

Many of our courses have placement tests, which allow you to test out of the material you already know. Check the overview page of your course to find out if a placement test is available. In this case, you will find a blue "Take Placement Test" button underneath the course progress bar.

What is a Study.com exam and how does it work?

A Study.com exam is an exam in which a student's activity and environment are monitored to imitate a traditional testing experience. Tests are monitored virtually through our third-party partner Software Secure. Users simply download Software Secure to their device and follow directions.

If you find yourself unable to achieve a passing score in your Study.com course, we recommend speaking with an advisor at your school. They may be able to recommend alternative courses that you can take to meet the requirements for your degree plan.

At one time children made May Day baskets to celebrate spring and enjoy the rewards of giving surprising gifts to their beloved ones. When I was in perhaps the third grade, our class took on such an adventure. For several days, we worked on creating paper baskets. We cut colorful stripes of construction paper and wove them together, following our teacher, Miss Anderson. We cut and wove and glued. Then we decorated them with our crayons and more cutting and gluing. Finally, we fitted paper handles onto the tops so that we could secretly hang our creations on the doors of unsuspecting receivers: surely our mothers.

We were finished right on time. Miss Anderson brought armloads of flowers for us to use in stuffing our prizes. Lilacs and tulips and al the colorful flowers of spring. We had to wait until the day was nearly over before we were allowed to choose the flowers that were just right for our baskets. I chose the biggest, most beautiful blossoms, allowing myself to be selfish for the sake of my mother. Then we fidgeted (烦躁) away what remained of our day, waiting for the clock to tick down the minutes to our release.

Finally, mercifully, the bell rang! We threw on our coats, gathered our homework and our lunch boxes, tied on our scarves and then, carefully, we cradled our offerings of love and off we ran to our individual homes! I was so excited! I ran as fast as I could down the hill, across the street, up the block, heading home. I paused at the corner of my house, to catch my breath and savor the moment. Then I glanced down to admire my offering one last time before I hung it lovingly over the doorknob. Horrors! Shock, dread and depression! My flowers were gone! Apparently, bouncing out on my mad dash home, all that was left was a sad, messed-up, wrinkled little empty basket! I stood on the doorway and burst into mournful sobbing tears.

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。

Para 1

By and by, my mom came to the door to discover the source of the sorrow.

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Para 2

Soon, my newly-decorated basket was ready to be offered again.

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内容包括：1. 活动内容；2.注意事项。

注意：1. 写作词数应为80左右；

2. 请按如下格式在答题卡的相应位置作答。

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The Beautiful Forbidden City

The Forbidden City, one of the most famous landmarks in China, (stand) at the heart of Beijing, carrying over 600 years of history. Having witnessed the reigns of 24 emperors, it has become a symbol of China's rich cultural heritage.

Visitors are often amazed by the grand halls and delicate gardens, which are designed with great accuracy (reflect) traditional Chinese culture. As they pass through the big red gates, they are immediately transported back in time. The intricate carvings and golden rooftops, which shine brilliantly under the sun, add to the palace's (glorious). Although China is home to many historical sites, few are more (impress) than the Forbidden City. It is a place ancient art and imperial power are perfectly combined, attracting millions of tourists each year. Strict rules have been applied to prevent damage from careless visitors, ensuring its charm remains well reserved future generations.

The site appears especially magical in winter, when a thin layer of snow (cover) the rooftops makes the golden bricks shine even brighter. In recent years, modern technologies (use) to protect and restore this ancient masterpiece. Thanks to these efforts, people can continue to appreciate (it) magnificence for centuries to come.

For those who love history and architecture, a visit to the Forbidden City ismust. It is not only a historical landmark but also a treasure of Chinese civilization.

We were hit by the worst stormy weather I'd ever experienced when3 Boston's Logan International Airport. The plane shook sharply. I4 the woman next to me and said, "Hey, would you mind talking with me for a few minutes? I'm really5." We hadn't spoken much during the flight6 the brief greetings. But my seatmate seemed friendly, and I suddenly felt anxious for a7 with others.

"Sure, my name is Sue Pernick." the woman replied with a warm smile. "What brings you to Boston?" I started to explain that I was on a business trip. Then the plane trembled violently, and I blurted out (脱口而出), "I might need to8 your hand." She took my hand in both of hers, patted it, and held on9. She was so10 and soothing. "This is a little bumpy, but we'll be on the ground safely soon," she told me.

On that11 flight to Boston, I almost cried12 because of Sue's firm hold, which kept me safe like a lifeline. Her gentle smile and the way she held my trembling hand will never13 from my memory. From Sue, I learned that it's OK to ask for14 from a stranger if you need it. Now whenever I am stressed or15, I just say to myself, "Just think of Sue!"

Master eye contact

Eye contact, if handled properly, can change people's opinions of you. But there's a thin line between making eye contact and staring blankly. The trick here is to maintain comfortable eye contact when you're listening or speaking.

Pick the right gestures

Our gestures can reveal our thoughts and emotions, often more accurately than our words. To command others' attention, just use simple, controlled movements such as raising an eyebrow or offering a slight nod. They convey a sense of self-confidence and sophistication(老练).

Use deliberate (刻意的) pause

I'm referring to the deliberate pause — that moment of quiet that gives weight to your, words and actions. Don't rush through your sentences in conversations. Instead, take your time, and pause at the right moments to let your message sink in.

Show active listening

Listening is a skill, and believe it or not, it shows in your body language. Are you leaning in slightly, maintaining eye contact, and nodding at appropriate moments? Or are you glancing around the room and using your phone? True class is about making others feel valued and heard by staying engaged.

A. Don't be afraid to let your true self shine.

B. One makes you look classy, the other awkward.

C. However, don't engage in overly dramatic gestures.

D. Pay attention to how you occupy and respect personal space.

E. It's not always about the words you say or the clothes you wear.

F. So next time you're in a conversation, try to be fully concentrated.

G. In the rush of conversations, we tend to forget the power of silence.

People can't bridge language gap and understand each other without iconicity. When playing a game of charades (猜字谜) , we act out our meaning, using our hands and bodies to describe the sizes and shapes of objects. The key to this process of forming new symbols is the use of iconicity. Not limited to gesturing, iconicity appears in our visual communication too. Traffic signs, food packaging, maps. . . wherever there are people communicating, you will find iconicity.

According to our research, iconicity might also exist in our voices. We organized a contest in which we invited contestants to record a set of sounds to express different meanings. The winner of the contest was determined by how well listeners could guess the intended meanings of the sounds based on a set of written options. Critically, the sounds that contestants submitted couldn't include actual words or onomatopoeias (拟声词) .

Listeners were remarkably good at interpreting the meanings of the sounds. Yet, all of the contestants and listeners were speakers of English. Thus, it was possible that listeners' success relied on some cultural knowledge that they shared with the speakers. Did the listeners also understand the speakers from completely different cultural backgrounds?

Later, an Internet survey translated into 25 different languages was carried out. Participants listened to each sound from the English speakers and guessed the meaning by choosing from six written words. Guessing accuracy for the different groups ranged from 74 percent for English speakers to 34 percent for Portuguese speakers. It is far from perfect, but well above the chance rate of eight percent expected by us.

Taken together, these studies show that our capacity for iconic communication has played a critical role. Without this special talent, language would likely never have gotten off the ground.

AI is designed to copy the human brain in decision-making and learning with the computing power to learn tasks in days or even hours. Most AI systems working in medicine employ smart algorithms (算法) and are accompanied by speech recognition and machine vision, thus helping them make their decisions more quickly and accurately when they are used in the medical field.

AI systems should learn about human medicine before they can be adapted for people in hospitals and homes. As a result, they are trained on large data sets of real-life cases. Detailed patient information in quantity is able to help fuel AI technologies, which plays a hugely important role in the success of medical AIs. One of the most important areas for AI's influencing global health is in the field of epidemiology (流行病学). Predicting disease outbreaks can save millions of lives by having resources ready if the worst happens: The company AIME has successfully combined public health data with AI to create a prediction engine able to predict epidemics months in advance with great accuracy.

Another field where medical AIs are making rapid advances is in diagnostics. AIs use pattern recognition to work through X-ray, CT and MRI images with unbelievable speed and accuracy. They have been able to do better than junior doctors and even senior specialists in some tests.

Rima Arnaout, an expert on heart disease, developed an AI that beat human doctors at correctly interpreting images by 79 percent to 92 percent. "Despite the result, as experts, we read the images and then go to see the patient," she said. "So we're both reading images and practicing medicine. I don't think that the second piece will be taken over so quickly."

Known as "Dr. Tatiana", the professor performs physics tricks with boundless energy and enthusiasm. Videos of her theatrical demonstrations have racked up (积累) hundreds of millions of views across social media platforms. In the videos, Erukhimova uses a range of everyday objects in her experiments, from ping pong balls and toilet paper to bicycle wheels and hair dryers.

It's clear she knows what it takes to get young people excited about a hard science. But it isn't always that way. When she first started teaching college freshman classes almost two decades ago, she struggled to grab the attention of her younger students. She was used to teaching juniors (大三学生) and found it easier to teach them. "By junior year, students enrolled in physics are determined to learn," she says. "But when it comes to teaching a large lecture hall of 100-plus first-year students, first impressions are important. Unfortunately, I did not grab their attention on the first day — that was my mistake!"

By the second semester, she found her footing, adjusting her approach to make her lecture halls feel smaller and get her students engaged. "Talk to your students before and after class. Walk up and down the stairs when you teach your class rather than stay on the stage, she says. "And add showy demonstrations, which help students connect the abstract concepts with real life."

Erukhimova has earned more than just recognition on social media. In October 2023, she was honored with a national award for science outreach "for leadership in bringing the excitement of physics through innovative education programs."

You are invited to join us to help explore the amazing variety of slippery and fascinating creatures usually hidden below the Hudson River's surface. We'll be using a fishing net to capture, identify, count and release fish species found splashing in the net that afternoon.

Data will be shared with NYS Department of Environmental Conservation to help understand the changes in the numbers and distribution of fish, and how they may be responding to different water and weather conditions. Much of the catch may be young fish, underlining the importance of the river's nursery habitat.

What to expect &what to bring

During the fish count, you may jump into long rubber boots (provided) to join in the fun of pulling the net through the water and checking out the fish, crabs and other river-life caught in the net, which is always filled with surprises. If you don't want to get wet, you are always appreciated to take photos on the shore, record our catch and share our results by texting or posting on Twitter or Facebook to compare notes with other participating groups.

Please note that this is a rain or shine event. If the weather is extremely hot, people may wish to walk in the water without rubber boots, but anyone doing so must have water shoes. We will provide the net, buckets, sorting containers and fish ID booklets.

When to begin

The event is scheduled for Saturday, August 10, 2:30 pm-4:00 pm at Schodack Island State Park, Schodack Landing, NY. This is a free event, but pre-registration is required. Registration opens at noon on August 6 and closes at noon on Friday, August 9.

My husband and I enjoy seeing life through the eyes of our children. It's amazing to watch as they discover their world.

While we were outdoors last summer enjoying the sunshine, our oldest daughter, Kaytlin, called me to the doorway. Beneath the steps was a baby red squirrel.

We watched it from a distance, not wanting to disturb it or scare off its mother. But after a long wait—and looking all around our house for signs of a nest or a mother—we realized the tiny squirrel was lost.

Shaking terribly, he was weak, thin, and hungry. We tried to find an expert to help, but the Inland Fisheries and Wildlife website showed that there were no wildlife experts in our area. After some quick research, we concluded that the best way to give the squirrel a fighting chance was to care for him ourselves. So a trip to the local store for milk and supplies was in order. More research taught us how much to feed him, how to estimate his age, how and when to wean (断奶) him, and that we should let him go as soon as he could survive on his own.

Our daughters and I took turns in feeding "Squirt." Kaytlin took on the most responsibility. She taught him to eat from a bottle, and she woke in the night for his feeds.

To our relief, Squirt soon became healthy and strong. Within a few weeks he became more active. He would chatter (吱吱叫) for his next meal, playfully go around the girls, and lie down on them for sleep. It wasn't long before he was weaned onto solid food and reintroduced to the wild.

His first few visits to the great outdoors were funny. Just like a child, he would play in the grass some and then run back to Kaytlin for safety. Soon she had him climbing trees and finding nest material.

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。

One day in the trees, Squirt met up with a family of gray squirrels.

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One night, Squirt didn't come back to our house and it rained hard.

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1.活动目的

2.活动内容

注意：1.写作词数应为80左右；

2.请按如下格式在答题卡的相应位置作答。

Notice

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Recently, foreigners have been more aware that traditional Chinese medicine (TCM) has scientific basis and the global growing interest turning to TCM to solve wellness problems is helping remove its "mystical" label. TCM is earning itself huge trust as effective medical practice.

The latest (strike) example of this shift happened when US influencer IShowSpeed streamed his trip to Chengdu, Southwest China's Sichuan Province on Monday, following three other trips across China. During the livestream, IShowSpeed visited a local traditional Chinese store, he explored various practices such as pulse diagnosis, bone setting, and acupuncture. Though afraid initially, he decided to experience the treatment was so pleasantly surprised to find that his headache had disappeared. The livestream video (view) millions of times on social media platforms within China and abroad in the past few weeks.

In Han Shiming's moxibustion (艾灸) store in Hunchun, Northeast China's Jilin Province, there have often been Russians crossing the border (special) to do moxibustion in recent years. These overseas guests have expressed satisfaction with the (effective) of the treatments, Han noted.

"The influence of the IP has helped awaken public cultural recognition of TCM. TCM is not outdated. Even in modern-day efforts to treat disease, TCM still has the ability (keep) the trend. Hopefully, it can be (far) developed and fully utilized," Sun Haishu, associate professor with the China Academy of Chinese Medical Sciences in Beijing said.

His job was to4 elementary school classes, listening to students read to him. He gave5 attention to the readers and never corrected or laughed at them when they stuttered. After reading, students would put a6 on Henry's nose, which he'd catch in his mouth.

One day, David, a special education student,7 us in class. Henry lay against the boy's shaking knees as he worked with great8 to read his picture book. Words9 in his throat. Henry licked his hands, and David tried again: "Cat... in... the..." Then a cool10 pushed the page with a picture of a hat. "HAT!" David shouted. Now they had a game: Henry smelt the book, and David read three words.

The moment they finished, the teacher whispered, "That's amazing!" Thinking she11 Henry, I replied, "Yes, he's quite a dog."

"No," she said, "David has never read so12 before!"

It's just one of the many times I saw the value of tiny13 Henry created. Over 200 school visits, Henry was rewarded over 600 biscuits and14 silent fears into brave voices. Children outgrew picture books, and classrooms changed posters, but my red-furred listener remained15.

It's common for many oceanic species to stick to specific habitats and only seldom swim beyond them. That is especially true for many immature animals, which are small and easy to fall victim to predators. This, however, can cause unexpectedly big problems for oceanic species, especially when infrastructure (基础设施) gets in the way.

Take, for example, the green sawfish living near the mouth of the Ashburton River in the Pilbara region of Western Australia. In 2017, engineers working on a local oil and gas processing plant built a new loading facility consisting of a large piling jetty (码头) and solid rock wall, which stretched 500 meters offshore. Later, scientists realized that the green sawfish were unable, or unwilling, to pass around the barrier. But that could prevent the animals from reaching valuable feeding grounds and other habitats.

This discovery leads to a surprising new idea that sea animals, much like land species, need a helping hand getting around human infrastructure. In the case of the green sawfish, engineers could have created underpasses in the jetty through which the fish could swim.

As the climate continues to change, many sea species are moving north and they need suitable habitats to move through. Whether creating pass-throughs in artificial structures or plotting routes away from warming oceans, thoughtfully designing our infrastructure could go a long way toward protecting animals as we continue to engineer the ocean.

Yong Suk Lee, associate professor of technology, economy and global affairs, was the lead author for the study. "Our research focused on Japan because it is a super-aging society that provides a good example of what the future could involve elsewhere — a declining population, a growing share of senior citizens and a declining share of working-age people," Lee said, "We need to be ready for this new reality."

In a future where there are more senior citizens requiring care, using robots in a targeted fashion could benefit workers and patients alike, Lee said. The study analyzed three types of robots that are increasingly used in assisted living facilities. Transfer robots, which nurses use to lift, move and rotate patients in beds and around rooms. Mobility robots, which patients use to move around and to bathe. Monitoring and communication robots, which include technologies such as computer vision and bed sensors that can record and examine patient data such as movement and share it with care providers.

"We found that robot adoption aids care workers by reducing quit rates. This is important because employee turnover is a big concern in nursing homes. Workers typically experience a great deal of physical pain, particularly in their knees and back. The work is hard and the pay is low. So robot use was associated with employee retention." Lee said, "Robots can improve productivity by shifting the tasks performed by care workers to those involving human touch, empathy and flexibility. Ultimately, robots can help workers provide a higher level of patient care."

"This research provides critical insights into how societies can successfully navigate the challenges of caring for aging populations," Lee said.

Puebla

This city in central Mexico attracts visitors with its UNESCO-recognized historic structures. Spring marks the final few months of Puebla's dry season, with temperatures just right for wandering through the city or admiring baroque architecture.

Machu Picchu

Spring is a time of transition at Machu Picchu. Tourists looking for ideal weather can book a trip in May, the beginning of this Peruvian heritage site's dry season. Whenever you visit, you'll be glad to set eyes on the 600-year-old Inca Citadel, one of the New Seven Wonders of the World.

Yellowstone National Park

As the snowfall starts to slow down, baby animals emerge in Yellowstone, making this national park an excellent place to spot wildlife in spring. Tourists can hike on the lower elevation (高度) trails that open in April and May, while mammal lovers can keep their eyes peeled for bears coming out of hibernation with their cubs.

Arches National Park

You'll be comfortable while exploring the park's 2,000 arches or biking along its scenic paved roads. If you like risking a cold front, you can avoid the crowds during a March trip. During the peak months of April and May, all park visitors will need a reservation to enter—an easy trade-off for perfect weather and seeing desert blooms sprout.