相关试卷

History shows many foods' status (地位) has changed. In 18th-century Europe, pineapples were uncommon and expensive, grown in heated glasshouses. They were used at parties to show off wealth, not for eating. However, once steamships could transport them, they became common and lost their luxury status. Similarly, oysters were once a cheap food for the poor in the 18th and 19th centuries. But overfishing and pollution made them hard to find, increasing their value and turning them into a symbol of fine dining.

Some items like sugar, tea, coffee, and cocoa were once expensive gifts only the rich could afford. Europeans' desire for them led to control over foreign lands and the use of enslaved labor. As production grew, costs dropped, making them everyday items for everyone, though they still appear in luxury gift sets.

The story of lobster (龙虾) is also surprising. It was so common on the US East Coast that it was fed to prisoners. Railway companies started serving canned lobster to passengers, who turned out to enjoy it. This new demand made lobster a luxury item in restaurants.

Several factors make a food luxurious. Scarcity is key — if a food is hard to get, like the historical pineapple, it becomes more valuable. High cost, often due to skilled labor, also makes food limited, like Japanese Wagyu beef. Marketing plays a big role too. If famous people or social media advertise a food, it can quickly become a must-have item, even if it's not rare.

Looking ahead, climate change may make some foods luxurious again. Chocolate and coffee are becoming harder to grow, which may make them expensive in the future. A new idea of sustainable (可持续的) luxury is also appearing. People want food that is not only special but also good for the earth, so they care about how food is produced. The true luxury isn't just about how expensive or uncommon something is.

It all started by chance. When Jackson was very little, Nick once wore a Batman T-shirt and also dressed his son in a Batman onesie (连体衣). He thought it would be a cute picture and took one. The next year, they happened to wear new Batman shirts again, so Nick took another photo without remembering the first one. By the third year, Nick realized he had created a tradition without planning to. He then decided to continue it every year.

Nick had shared these photos on his private social media over the years. Recently, he posted a collage (拼图) of the pictures on Reddit, and the story became very popular online. Many people loved seeing the changes in the father and son.

For Nick, the best part is looking back at how his son has grown. He also finds the tradition a good way to bond with Jackson, as they both like superheroes. Nick plans to keep taking these photos as long as possible. He thinks it will be funny to see when Jackson becomes taller than him.

Though Nick doesn't have special plans for the photos, he may make a collage or a video for his son's important birthdays. For him, the tradition is not just about pictures — it's about recording time and the love between a father and his son.

Caltech invites everyone to join its events. You can explore the exciting connections between art, science, and engineering. Join us online or in person for our upcoming events.

Astronomy on Tap

Date: October 27, 2025

Time: 7:30 PM — 9:30 PM

Place: Dog Haus Biergarten

What do we know about planets outside our solar system? Join us to find out! We will have two short talks, a Q&A session, and fun space facts. You can also enjoy watching stars with telescopes. Live music will be played during breaks.

Special Performance about Mars

Date: October 30, 2025

Time: 7:30 PM — 9:00 PM

Place: Beckman Auditorium

This special show uses music and visuals to tell the story of Mars. It follows our dream of reaching the Red Planet. Could humans live on Mars one day? Come and explore this question.

Science Journeys Saturday

Date: Saturday, November 8, 2025

Time:11:30 AM — 13:00 PM

Place: Beckman Auditorium

After a hands-on pre-show, Caltech graduate student Alejandro will present his science research, including a drone(无人机) show, and share how he creates inventions and explores new knowledge.

Writers in Residence Program

Date: November 10, 2025

Time: 6:00 PM — 7:00 PM

Place: Dabney Hall, Lounge

Writer Daryl Gregory and Professor Jocelyn Holland will talk about Gregory's new novel, When We Were Real. The book asks a big question: what if our world is not real? Join the conversation about reality and science.

I was on a delayed train from London, anxious about missing my last connecting train home. The carriage was full, and a friendly lady sat next to me. We first talked about the delay, and then about our own wonderful experiences.

"Sometimes, delays happen for a reason," she said softly. Though I didn't fully understand then, her thoughtful words stayed with me as the station grew near.

Soon it was clear that I would miss my connection by minutes. With home a four-hour drive away, I faced finding a hotel. Just as I stood up to leave, the lady said, "You could stay with me tonight." Though I felt I could trust her, I knew I must call my mother first. "Mum, a kind lady on the train has offered me a room," I said. Feeling worried, my mother asked to speak to her directly.

What happened next was wholly unexpected. As they spoke, the woman's expression changed — from polite attention to gentle surprise. She handed the phone back, and my mum's voice was different now. "You may stay. That is Mrs Lewis, who was my English teacher years ago," Mum told me. What a surprise! The kind stranger beside me was someone who had once taught my mother.

That evening, Mrs Lewis led me into her study. From the top shelf, she took down a worn notebook. "Your mother was one of my most thoughtful students," she said, opening it to a certain page. In my mother's youthful handwriting, there was an essay titled "Kindness Is a Circle". Beside it, in Mrs Lewis's red pen, was a note: "True. And sometimes the circle takes years to complete." I stared in surprise. It was as if these words had been waiting in silence for tonight to make perfect sense. Mrs Lewis explained, "Your mother wrote that kindness passes like a circle and may return to its starting point in unexpected ways. I think tonight that circle has closed."

注意：

(1)续写词数应为150个左右；

(2)请按如下格式在答题卡的相应位置作答。

The next morning, Mrs Lewis took the notebook with her and drove me to the station.

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Holding that notebook, I understood it was a bridge between the past and the present.

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(1)阐述分享的重要性；

(2)举例说明分享带来的收获。

注意：

(1)写作词数应为80个左右；

(2)请按如下格式在答题卡的相应位置作答。

Benefiting from Sharing Ideas

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A pioneering substation (变电站) in Xiong' an New Area, Hebei Province, is providing a fresh (solve) for sustainable urban power supply. The Fuxing 220-kilovolt substation, China's first circular steel-structured substation and the first full-lifecycle near-zero carbon facility in Xiong'an, (feed) green energy into the new area since its operation began on June 30.

Zhang Longyue, staff member at State Grid Hebei Electric Power Construction, said that the circular shape increases wind speed, empowering natural wind (take)away heat from equipment without using extra energy for cooling. This design also reduces land use by nearly 30 percent compared to (convention) substations. In addition, temperature control in the building (achieve) by means of aluminum panels with small holes. Its roof is equipped with 1,600 square meters of solar panels, (generate) about 320,000 kilowatt-hours annually to power its needs.

The substation is masterfully designed to be both eco-friendly and (functional)vital. By replacing walls with permeable bricks and plants, the substation exists in harmony the environment. It has an annual transmission capacity of 900 million kilowatt-hours, can meet the electricity needs of 220,000 households. As such, it serves as a crucial power source for the area's projects and supports the local sustainable growth.

When I first spoke with him, I realized that what he4 most was not medical knowledge but a sense of5. So, I said to him, "Don't worry, Mark. It is a small6, and it is surely risk-free." I explained the procedure7, in order that he could picture each step in his mind. Then I showed him a simple model of the skin. As he watched, his face8, and meanwhile, he screamed excitedly, "Amazing I9 to know more about medicine in the future." Apparently, his10 replaced his anxiety.

The next day, Mark walked into the outpatient room, somewhat nervous but quite determined. During the operation, I regularly talked to him so that he would maintain11 stability. Within thirty minutes, the cyst was12, and when he saw the bandage on his shoulder, pride spread across his face. His mother let out a long breath of relief.

During his hospitalization, Mark shared that the experience13 him — he now hopes to become a doctor. Such14 moments reminded me why I chose this work; Even a small operation could15 a young heart. His courage turned that day into a turning point, encouraging us both.

So, that may help explain why journal writing is powerful. All you simply need is pretty much a pen, a journal, and a determination to write. And you have the right to write whenever you feel like writing.

By insisting on writing, you will have a better understanding of what you have been through, what you need, and what you should throw away. This simple act of putting words to your experiences can be worthwhile in your lifetime.

One question for those learning how to write journals is what they should write about. There are no strict rules about what makes up "proper" journals. Just remember: You can write anything that matters to you. That's because journal writing is about the process, not perfection.

Many journals may begin with the concrete details of a day. This can serve as a warm-up, allowing your writing muscles to engage before diving into deeper reflection. From this starting point, you may naturally transition into exploring your thoughts and feelings about these events. Grab your pen, get curious in your journal, and start the journey of exploring yourself.

A. Another advantage is its convenience.

B. Besides, journal writing is challenging.

C. Actually, journal writing helps you to enrich your life.

D. It is a judgment-free zone where all topics are welcome.

E. It is unlike other forms of writing that may be created for an audience.

F. You may write what happened or who you interacted with in daily life.

G. So, setting a limit on the content of your journals is the key to perfection.

Research gives us a clear answer: Our brains work best, and we feel happiest, when the thermostat (恒温器) is set to about 70°F-72°F (around 21℃-22℃) with moderate humidity (40%-70%). A good mood matters because it helps us think more clearly, be more creative, and get along better with others — all things we need in our daily lives. For anyone living or working in today's world, this ideal temperature range of 70°F-72°F should be simple to plan around. If you're going to spend time indoors, take a moment to dress in a way that fits this mild, temperate setting. But if you dress as if you're heading to a hot jungle or a bitterly freezing area instead, you'll almost certainly end up feeling too warm or too cold — and that's a result of your own clothing choice, not the thermostat's setting.

There's a little flexibility around 70°F. Small changes might depend on where people live and their life experiences. But since most people in the same space have similar experiences, these tiny differences rarely cause arguments. Other things matter more: Where the thermostat is placed, whether blinds are up or down, and how much air circulates. Even room colors help — cool colors make you feel a bit colder, while warm colors feel warmer and more comfortable. And remember: Our feet get cold easily, so floor heaters work well, while our heads feel heat more, so ceiling air conditioners are smart.

If you want more help, the Center for the Built Environment at the University of California, Berkeley, has a useful online tool. It suggests temperature settings and even considers what you're wearing. Next time there's a temperature fight, speak up for 70°F-72°F — it'll boost your brainpower and make you feel better!

The advantages of medical VR systems begin with their user-friendly design. Modern VR wearable devices feature lightweight construction and wireless connectivity, ensuring comfortable extended use. High-definition displays create realistic virtual environments, while integrated sensors precisely track body movements. Advanced models even combine eye-tracking technology to monitor patients' visual attention, providing valuable data for healthcare professionals. Beyond creating realistic experiences, these systems employ complicated software to enhance treatment outcomes. Artificial intelligence algorithms (算法) can analyze patients' movements in real time, automatically adjusting therapy difficulty to match individual progress. The combination with cloud technology allows for secure data storage and enables remote monitoring by medical teams. This connectivity also lets different systems work together by connecting with other digital health platforms, like telemedicine services and wearable fitness trackers.

The practical benefits of VR in healthcare are epoch-making. For patients, interactive virtual environments increase engagement and motivation during recovery exercises. For medical institutions, these systems can reduce staff workload while providing detailed progress tracking. Some VR systems have already obtained official medical device certification, confirming their safety and effectiveness for clinical use.

Looking ahead, as technology continues to advance, VR applications in medicine are expected to expand further. Current research explores their potential in treating psychological conditions, managing chronic pain, and enhancing medical education. While not replacing traditional methods entirely, VR technology offers a valuable supplement to traditional treatments, potentially making healthcare more accessible and effective for patients everywhere.