官方模考题07

Man: I just got an email saying that the company picnic at Emerald Park has been rescheduled. Woman: Oh, really? How come? Man: Apparently the forecast is terrible next Wednesday... heavy rain. Woman: Oh, that makes sense. Did they mention the new date? Man: Yes, this Saturday, the tenth. Woman: I'll mark my calendar. I'm looking forward to having some food in good company.

Man: I'm having trouble deciding which laptop to buy. There are so many options out there. Woman: Have you narrowed it down at all? Man: Sort of. I'm debating between a high-performance model for gaming and a more budget-friendly one for everyday tasks. Woman: Have you read some user reviews? They might help you decide if the extra cost would be worthwhile. Man: Yeah, maybe. Though the reviews of the sneakers I bought last month said they're super-durable, and yet I have holes in them already.

Man: Before we get started, don't forget that the first draft of your research paper is due on Monday. This draft should include your thesis statement, main arguments, and a preliminary list of sources. It's only a draft, so it's okay if it's not perfect. The goal is to get feedback and refine your ideas. Please submit your draft electronically via the course portal by midnight on Monday.

Man: Today we're exploring neuroplasticity, which means the brain's ability to reorganize itself by forming new neural connections throughout life. Neuroplasticity allows the brain to adapt in response to learning, experience, and other stimulation. This remarkable capacity for change is crucial for cognitive development and skill acquisition. There are two main types of neuroplasticity: structural and functional. Structural neuroplasticity involves changes in the physical structure of the brain, such as the growth of new neurons or the strengthening of synapses. Functional neuroplasticity, on the other hand, refers to changes in the brain's activity patterns, allowing different areas to take over functions previously managed by underperforming regions. For example, if a region responsible for language processing becomes less active, nearby or even distant areas may increase their activity to support language functions. Now, research has shown that engaging in activities that stimulate the brain, such as learning new skills, physical exercise, and cognitive training, can enhance both structural and functional neuroplasticity. Consider aerobic exercises like running or swimming—they help the brain by boosting a special protein called BDNF, which works like fertilizer for brain cells, helping them grow and stay healthy. Understanding neuroplasticity has important implications for creating strategies that promote brain resilience. By leveraging neuroplasticity, researchers and practitioners aim to support cognitive vitality in people of all ages.

Woman: Are you all set for your presentation tomorrow? Man: Almost. I still need to finalize my slides and add a couple more visuals to make it engaging. Woman: If you need any help, let me know. I'm done with mine already. Man: Well, it'd be helpful for me to practice my speech in front of someone... Woman: I'm free at 4:30, if you want to come by my office. Man: Thanks! I appreciate it. I'd love to get your thoughts before I deliver it to the full audience tomorrow.

Man: Environmentally minded students will be happy to know that compost collection bins have been placed next to every paper and plastic recycling receptacle in the student center food court. Now, any uneaten food can be placed into a compost bin. The contents of the bins are collected daily by agriculture students who are transforming our food waste into plant food through the process of composting. Please do your part to keep our campus sustainable through recycling and composting.

Woman: Today, I want to talk about a fascinating topic in chemistry: catalysts—substances that speed up chemical reactions without being used up. Think of them as helpful assistants that make reactions happen faster and more efficiently, while staying unchanged. This means they don't become part of the final product, so they can be reused again and again in multiple reactions. Catalysts are everywhere. In our bodies, enzymes act as natural catalysts, helping with digestion and metabolism. In industry, they're essential for making plastics, medicines, and fuels. What makes catalysts powerful is that they lower the energy needed for a reaction to happen. Imagine baking a cake: the recipe says to heat the oven to 400°F, but someone gives you a special pan that lets it bake perfectly at 300°F. That pan is like a catalyst—it helps the ingredients become a cake, a product, using less energy. Now, let's look at something even more advanced: nanozymes. These are tiny, artificial materials that mimic enzymes. They're more stable in harsh conditions like heat or acidity, cheaper to produce, and can be tailored for specific tasks. For example, nanozymes are used in environmental cleanup efforts. They can break down harmful pollutants in extreme conditions—like polluted water or industrial waste—things like pesticides, dyes, or heavy metals—turning them into safer, less toxic substances.