Đề ôn thi Đề thi vào lớp 10 Trường THPT Chuyên KHXH môn Tiếng Anh - Mã đề KHXH-117

Sea salt is (35) __________ essential mineral that has been used by humans for thousands of years, not just for flavoring food but also for preserving it. The method for obtaining salt from the ocean is a fascinating natural process, assisted by human effort. This process, known as solar evaporation, is most effective in coastal regions with hot, dry climates and low rainfall.

The first step is to channel seawater into a series of large, shallow ponds. These large ponds are also known as salt (36) __________. They are designed to be shallow so that a larger surface area of water is exposed to the sun and wind, which speeds up the evaporation process. The water is then moved from one pond to another as it becomes saltier.

As the water sits in these pans under the hot sun, it slowly begins to disappear into the air. The water level drops (37) __________ the sun and wind cause evaporation, leaving behind a highly concentrated saltwater solution. This is the most crucial stage, as it relies entirely on the right weather conditions to be successful.

Once most of the water has evaporated, salt crystals begin to form. This process involves (38) __________ large piles of salt which are then raked and collected by workers. A worker once explained that the weather (39) __________ crucial for a good harvest. After collection, the raw salt is often washed. Any remaining impurities are carefully (40) __________ to ensure the salt is pure before it is packaged.

For people who live in these coastal regions, harvesting salt is not rocket science; it's (41) __________. The entire system is a beautiful example of using nature's own power to produce a valuable resource. If the climate were not hot and dry, this entire process (42) __________ possible. It shows a simple yet effective way humans have worked with the environment for centuries.

Have you ever thought about the impact your daily life has on the planet? Every time you turn on a light, charge your phone, or travel to school, you are contributing to what is known as your 'carbon footprint'. This term represents the total amount of greenhouse gases, primarily carbon dioxide (CO2), released into the atmosphere because of your activities. These gases trap heat, leading to global warming and climate change. Understanding your carbon footprint is the first step towards making more environmentally conscious decisions.

On a larger scale, the concept of a carbon footprint applies to countries as well. As Vietnam's economy continues to grow rapidly, there has been a significant increase in its national carbon emissions. This growth, while positive for development, presents a major environmental challenge. In response, the Vietnamese government has implemented policies like the National Strategy on Climate Change, which aims to promote a low-carbon economy. This strategy encourages industries to adopt cleaner technologies and pushes for the development of renewable energy sources, balancing economic progress with environmental protection.

So, how does this relate to you, a teenager in Vietnam? Your individual choices add up. Think about your daily routine. Do you travel to school by motorbike, bicycle, or electric bus? Do you leave your computer on all night? The food you eat also matters. Locally grown produce has a smaller carbon footprint than imported goods that travel thousands of kilometers. All of these small decisions define the size of a teenager's personal carbon footprint and their overall impact on the environment.

The good news is that reducing your carbon footprint doesn't require drastic changes. Simple habits can make a big difference. For instance, unplugging chargers and electronics when they are not in use can cut down on 'phantom' energy consumption. Choosing to walk, cycle, or use public transport instead of private vehicles reduces emissions significantly. Furthermore, being mindful of waste by reducing single-use plastics and recycling properly helps conserve resources and energy.

Ultimately, tackling climate change is a collective effort. While government policies and corporate actions are crucial, the power of individual choice should not be underestimated. By understanding and actively working to reduce your carbon footprint, you are not just making a small personal change. You are becoming part of a global movement of young people who are taking responsibility for the future of our planet. Your choices today will shape the world of tomorrow.