Đề ôn thi Đề thi vào lớp 10 Trường Phổ thông Năng khiếu môn Tiếng Anh - Mã đề PTNK-64

Wind is a form of solar energy that results from the uneven heating of the atmosphere by the sun. Essentially, wind is just air in motion. This movement creates kinetic energy, which humans have used for centuries. Because the wind will always blow as long as the sun shines, it is a powerful and renewable resource. This means that we can use it to generate power without worrying about it running out, unlike fossil fuels like coal and oil.

To capture wind energy, we use special machines called wind turbines. A typical wind turbine has a very tall tower with large blades, (21) __________ look like propellers on a plane. These blades are carefully designed to capture the maximum amount of wind energy. The size and shape of the blades can vary depending on the location and the average wind speed, but they all serve the same fundamental purpose.

The process of generating electricity from wind is quite straightforward. When the wind blows, it pushes against the blades, causing them to spin. The kinetic energy from the wind is transferred to a central rotor. This rotor is connected through a series of gears to a generator. This rotation powers a generator to create electricity, which is then sent out to power homes and businesses. It's a (22) __________ effective process.

One of the greatest advantages of wind energy is that it is a clean fuel source. It doesn't pollute the air like power plants that rely on burning fossil fuels. (23) __________, it is a domestic source of energy, which can increase a country's energy security. Large groups of turbines, known as wind farms, are often built in windy locations like coastlines or open plains. Each turbine can generate enough electricity for hundreds of homes.

The main benefit of wind energy is that it is a renewable resource that produces no greenhouse gas emissions during operation. As the world continues to seek cleaner energy solutions to combat climate change, wind power will undoubtedly (24) __________ a crucial role in our sustainable future, helping to create a healthier planet for generations to come.

For many students worldwide, academic demands can feel overwhelming. Late-night study sessions, early morning classes, and extracurricular activities often leave young people feeling drained. In this quest for an instant pick-me-up, energy drinks have become a common companion. They promise a quick burst of focus and stamina to power through homework or stay alert during a long lecture. But is this perceived advantage truly beneficial, or are students unknowingly engaging in a risky health gamble when they reach for these popular beverages? [I]

[II] Brands like Sting and Red Bull, with their vibrant packaging and aggressive marketing, are staples in every convenience store and street stall. Their easy accessibility and affordable price points make them readily available to a young, active demographic, including teenagers. When a mid-afternoon slump hits or a boost is needed for an evening cram session, reaching for one of these cans can seem like the most obvious choice.

The immediate "boost" these drinks provide primarily comes from their potent combination of high sugar content and significant doses of caffeine. [III] Caffeine is a well-known stimulant that can temporarily enhance alertness and reduce fatigue, while the added sugars contribute to a sudden rush of energy. This can make you feel more awake, focused, and ready to tackle tasks, which is why many students find them appealing. However, this quick surge often masks the underlying issue of exhaustion rather than truly resolving it.

[IV] However, relying on these artificial pick-me-ups comes with a considerable health gamble. The initial energy spike is often followed by an inevitable "sugar crash," leaving you feeling more tired and irritable. High caffeine intake can lead to jitters, anxiety, headaches, and disrupt crucial sleep patterns, making it harder to focus the next day. Regular consumption can also contribute to dental erosion due to acidity, and in more severe cases, cause heart palpitations or other cardiovascular stress, especially in developing bodies.

Ultimately, while an energy drink might offer a momentary feeling of alertness for that evening class or exam preparation, it’s vital to understand the true cost to your body and mind. Instead of a sustainable solution, they offer a temporary fix with potential long-term drawbacks. For students aged 14-15, it's crucial to prioritize genuine well-being. Opting for balanced nutrition, adequate sleep, regular physical activity, and sufficient water intake are far more effective and healthier ways to maintain focus and energy throughout your demanding academic life. Making informed lifestyle choices is key.