Đề ôn thi Đề thi vào lớp 10 Trường Phổ thông Năng khiếu môn Tiếng Anh - Mã đề PTNK-50

Every day, we throw away tons of paper, but have you ever considered where it could go instead of a landfill? The process of turning old newspapers into cellulose insulation is a (21) __________ example of this principle. This transformation not only reduces waste but also creates a valuable product used in building homes. It is a clear demonstration of how recycling can turn one item into something completely different and useful.

The process begins when large quantities of old newspapers are collected from recycling centers. Before they can be used, they must be sorted to remove any glossy paper or plastic items. Once sorted, the paper is fed into special machines that shred it into very small, fine pieces. The paper must undergo this initial breakdown to create the base material for the insulation.

This converts the paper from a simple sheet into a fluffy, fibrous material. Next, the shredded paper is treated with non-toxic chemicals, most commonly boric acid. This is a crucial step in order to make the final product a fire retardant, which means it helps to prevent the spread of fire. Not only is the material treated for safety, but it (22) __________ becomes more resistant to pests and mold.

After the chemical treatment, the damp mixture is dried. This step is carefully controlled to ensure the insulation has the right density and texture. The end result is a loose-fill material that is light and (23) __________ as an insulator. Because of its eco-friendly origins and performance, it is often considered one of the (24) __________ sustainable insulation options available on the market.

In conclusion, the journey from a discarded newspaper to high-performance building insulation is a remarkable example of modern recycling. It takes a product that has served its purpose and gives it a new, long-lasting life, helping to make our homes more energy-efficient and environmentally friendly.

The sun feels fantastic on your skin, especially when you're out with friends, playing sports, or enjoying a day at the beach. Many people associate sun exposure with a healthy glow or a desirable tan. [I] Beneath the warmth and light, ultraviolet (UV) rays are at work, and their effects can be far-reaching, extending well beyond a summer tan. Understanding these impacts is crucial for your long-term health.

[II] Globally, dermatologists are sounding the alarm about the serious, long-term consequences of unprotected sun exposure. [III] It’s not just about getting sunburned; repeated exposure, even when it doesn't cause a noticeable burn, can lead to significant problems. These include premature skin aging, resulting in wrinkles and sunspots appearing much earlier than they should. More concerningly, it dramatically increases the risk of skin cancer, including melanoma, which can be life-threatening. These harmful UV rays even penetrate clouds, meaning you're still at risk on overcast days.

In a tropical country like Vietnam, sun protection is especially critical. The intense equatorial sun means that UV levels are consistently high, making everyday outdoor activities potentially damaging. This awareness is deeply ingrained; it’s common to see people, especially women, wearing "áo chống nắng" – full-coverage sun protection jackets – while driving or walking. Furthermore, a market is full of specialized sun care products, with popular brands like Sunplay leading the way, highlighting a collective understanding of the need for effective sun defense.

You might think skin damage is a future worry, but protecting your skin now, during adolescence, is a vital investment in your health. [IV] Your skin remembers every bit of sun exposure, and damage accumulates over time. This is why understanding terms like SPF (Sun Protection Factor) and how to apply sunscreen correctly is such an important life skill. Whether you're playing football, riding your bike, or heading to the beach, consistently using a broad-spectrum sunscreen with an adequate SPF, and reapplying it regularly, is essential.

Ultimately, embracing sun protection isn't about avoiding the outdoors; it's about enjoying it safely and smartly. By making simple habits like applying sunscreen and seeking shade part of your routine, you are actively safeguarding your skin's health and appearance for years to come. Your skin is your body’s largest organ, and taking care of it today means a healthier, more vibrant you tomorrow.