Đề ôn thi Đề thi vào lớp 10 Trường THPT Chuyên KHXH môn Tiếng Anh - Mã đề KHXH-40

The Earth's oceans represent a vast and (35) __________ source of untapped renewable energy. Beyond the familiar power of the sun and wind, the ocean itself provides a consistent force we can harness: the tide. Tidal energy is a method of generating electricity by using the natural rise and fall of sea levels, offering a clean and sustainable alternative to fossil fuels.

This daily movement of water is caused by the gravitational pull of the Moon and Sun. Because the movements of these celestial bodies are known with great accuracy, the resulting tides are extremely (36) __________. The cycle of high and low tides happens every day without fail, which means we can calculate the availability of this energy source far into the future.

To capture this power, engineers place large underwater turbines in areas with strong currents. These machines, which look similar to wind turbines, are designed to withstand the ocean environment. They (37) __________ be placed in specific locations, such as estuaries or narrow channels, where the water flow is strongest. As the tide moves in and out, the water turns the blades of the turbines to (38) __________ electricity.

One of the biggest benefits of tidal power is its reliability. It is much (39) __________ consistent than wind or solar power, which can be affected by changing weather. (40) __________ means that grid operators can depend on a steady supply of energy. Furthermore, the technology is remarkable. Not only (41) __________ it clean and renewable, but its underwater placement also means it has a low visual impact on the landscape.

(42) __________, tidal power is an exciting and growing field of renewable energy. While it is not yet as common as other forms, its potential for providing dependable, clean electricity to coastal regions is enormous. With continued development, the powerful, daily pulse of the ocean could play a key role in our future energy mix.

From a bustling Ho Chi Minh City apartment to a quiet student dormitory in Hanoi, the sight and smell of instant noodles are unmistakably familiar. Vietnam is one of the world's top consumers of this quick-fix meal, with brands like Hảo Hảo and Omachi being household names. For busy students, they represent a perfect solution: a hot, savory meal ready in just three minutes. This convenience, however, comes with questions about its nutritional value and long-term effects on health, turning a simple meal into a complex topic of discussion.

The global popularity of instant noodles is easy to understand. First, they are incredibly affordable, making them accessible to people on a tight budget, especially students. Second, they are convenient; all you need is hot water and a few minutes. They also serve as a versatile base for a meal, allowing for the addition of eggs, vegetables, or meat. A significant part of their appeal is also the long shelf life, which means they can be stored for months without spoiling, making them a reliable option to have in the pantry.

Despite their convenience, most instant noodles are not a model of healthy eating. Nutritionally, they are often high in calories, sodium, and saturated fats, while being low in essential nutrients like fiber, vitamins, and minerals. A single packet can contain more than half of the recommended daily sodium intake, which can contribute to high blood pressure over time. Furthermore, to extend their shelf life, manufacturers often use a preservative called Tertiary-butyl hydroquinone (TBHQ). While approved for consumption in small amounts, some health experts worry about the potential negative effects of consuming it regularly.

However, this does not mean you have to give up instant noodles entirely. With a few simple modifications, you can make them a much healthier meal. A key strategy is to use only half of the seasoning packet to significantly reduce sodium intake. Another excellent tip is to 'pimp your noodles' by adding fresh ingredients. Tossing in some green vegetables like bok choy (cải thìa) or water spinach (rau muống), a boiled egg for protein, or some lean chicken can transform a basic snack into a more balanced and nutritious dish.

In conclusion, instant noodles are neither a superfood nor a dietary villain. Like many convenience foods, their health impact depends on frequency and method of consumption. Enjoying them occasionally as a quick meal, especially when enhanced with fresh ingredients, is perfectly fine. For students juggling studies and a busy life, the key is moderation and being mindful of turning a simple, quick meal into a more nutritious one.