Đề ôn thi Đề thi vào lớp 10 Trường THPT Chuyên KHXH môn Tiếng Anh - Mã đề KHXH-76

The modern smartphone is (35) __________ marvel of engineering, and its screen is one of the most complex components. The assembly process is a delicate dance between man and machine, requiring incredible precision. What we see as a single sheet of glass is actually a multi-layered sandwich of materials, each serving a specific purpose.

The journey begins with a sheet of specialized, durable glass, often called Gorilla Glass. Before it can be used, the glass is chemically (36) __________ to increase its durability. This treatment, (37) __________ as ion exchange, makes the glass resistant to scratches and impacts. The glass is then polished and cleaned in a dust-free environment to ensure no particles are trapped.

Next, a very thin layer of optical adhesive is applied. This layer is incredibly thin (38) __________ not interfere with touch sensitivity. Directly under this, the LCD or OLED panel is attached. Robotic arms carefully (39) __________ the display panel, which is then bonded to the glass using pressure and UV light. This process must be flawless.

Precise alignment is critical. Lasers are used to ensure every layer is positioned correctly, down to the micrometer. If the layers (40) __________ perfectly aligned, the screen would show distortions or dead pixels. Each unit is tested rigorously. A quality control manager once said that the goal (41) __________ zero defects for every batch.

Finally, the completed screen assembly is tested for functionality, including touch sensitivity, color accuracy, and brightness. When a screen passes all these tests, the technicians know they have (42) __________. The final component is then ready to be integrated into the main body of the smartphone, completing a journey from simple glass to an interactive window to the digital world.

When you sit down for dinner, you probably think about the taste of the food on your plate. But have you ever considered where it all begins? The answer lies in something we often take for granted: the soil. This thin layer of 'black gold' on the Earth's surface is a complex, living ecosystem responsible for growing 95% of the world's food. However, this vital resource is facing a silent crisis known as soil degradation, which is the decline in soil quality. This global problem threatens not only our environment but also the future of our food security.

In Vietnam, a country with a strong agricultural backbone, this issue is particularly resonant. The Central Highlands, famous for its robusta coffee, provide a clear example. To maximize production and profits, many farms have relied heavily on intensive farming and the overuse of chemical fertilizers for decades. While these chemicals can boost growth in the short term, they gradually strip the soil of its essential nutrients and organic matter. As a result, the land becomes less fertile, crop yields decrease over time, and the very foundation of the region's economy is weakened.

The consequences of degraded soil extend far beyond the farm. When soil loses its structure, it cannot hold water effectively, making crops more vulnerable to drought. This directly impacts food security, potentially leading to higher food prices and shortages. Furthermore, the excess chemical fertilizers don't just disappear; they are often washed away by rain into rivers and lakes. This runoff pollutes water sources, harming aquatic life and affecting the quality of water available for communities, creating a ripple effect of environmental damage.

Fortunately, the situation is not hopeless. Across Vietnam, there is growing awareness and action. The government, through bodies like the Ministry of Agriculture and Rural Development, is promoting sustainable agriculture. Farmers are being encouraged and educated to adopt healthier practices. These include crop rotation, which involves planting different crops in sequence to restore nutrients, and using organic compost instead of synthetic chemicals. By investing in these methods, farmers can improve their long-term productivity while protecting the environment.

Protecting our soil is a responsibility that affects everyone. It requires a collective effort from governments, farmers, and even consumers who can support sustainable farming. The health of the ground beneath our feet is directly linked to the health of our future generations. Ensuring our soil remains fertile and productive is one of the most important investments we can make for a sustainable and food-secure Vietnam.