Đề ôn thi Đề thi vào lớp 10 Trường Phổ thông Năng khiếu môn Tiếng Anh - Mã đề PTNK-73

Have you ever wondered why we have hair and nails? They are not just for appearance; they serve important functions. Both hair and nails are made of a strong protein called keratin. While they might seem like simple parts of our body, their primary role is the (21) __________ of our bodies in several clever ways. These structures are key features of the integumentary system, which includes skin, hair, and nails.

Let's first consider hair. The hair on our scalp offers excellent protection from the sun's rays, shielding the sensitive skin underneath. In addition to this, the hair on our head (22) __________ keep us warm in colder weather by trapping a layer of air close to the skin, which acts as an insulator. This function is especially important for maintaining our body's core temperature.

Hair has other protective roles, too. Eyebrows and eyelashes are strategically positioned to keep dust and sweat out of our eyes, preventing irritation and potential infections. The tiny hairs inside our nose also help to filter the air we breathe. (23) __________, hair serves as a multi-purpose shield for our upper body, protecting it from environmental elements.

Similarly, nails are designed for protection. They cover the delicate tips of our fingers and toes. Like hair, nails are also made of keratin. This material is significantly harder than the skin it covers, providing a tough shield against injury. Furthermore, fingernails enhance our sense of touch and improve our dexterity. For instance, it helps us maintain a better grip on objects. This makes simple actions like picking up a coin much easier. They also help us perform delicate tasks, such as scratching an itch or (24) __________ small items.

Not only are hair and nails fascinating biological features, but they are also essential for our daily well-being. From protecting our scalp to helping us grip objects, these keratin-based structures play a vital and often unappreciated role in our interaction with the world. They are a perfect example of how every part of the human body has a specific purpose.

The target of walking 10,000 steps daily has become a globally recognized benchmark for physical fitness. Fueled by fitness trackers and health organizations, this goal transformed how many view daily activity. [I] It proposes an accessible yet tangible objective for improving health, often sparking questions about whether this simple act of walking is truly sufficient for comprehensive well-being. This popular challenge encourages consistent movement, prompting individuals worldwide to be more mindful of their step count.

While the 10,000-step challenge seems modest, its benefits are substantial. Regular walking improves cardiovascular health, boosts mood, and helps manage weight, requiring no specialized equipment. [II] For many, this target represents a fundamental level of daily activity. [III] However, for intense athletic goals or muscle building, walking alone may need supplementation with other forms of exercise. [IV] It's a highly effective way to integrate physical activity into busy lives.

In Vietnam, the emphasis on walking resonates deeply with daily life and culture. Public spaces, like the Hoan Kiem Lake walking street in Hanoi, encourage pedestrian activity, making movement integral to the urban landscape. People of all ages engage in walks and light exercises in community parks, highlighting a collective appreciation for fitness. This existing infrastructure means adopting a 10,000-step goal isn't a radical shift, but an enhancement of established healthy habits that are already part of the community's rhythm.

For teenagers, particularly those aged 14-15, the 10,000-step challenge holds significant relevance. You already walk extensively every day—to school, between classes, and around your home. Thinking about these steps not just as transportation but as deliberate exercise can be a powerful reframing. Tracking your steps, perhaps with a phone app, is an incredibly easy, free, and non-intimidating way to boost your health. It offers a tangible goal fitting seamlessly into your routine, building healthy future habits.

Ultimately, whether 10,000 steps is "enough" depends on individual fitness goals, but it represents a significant stride towards a more active lifestyle. It's a fantastic starting point for anyone aiming to improve their health without feeling overwhelmed. While it may not replace high-intensity workouts for elite athletes, consistent daily walking offers remarkable benefits for general well-being. Embracing this simple yet effective challenge empowers you to take control of your physical fitness, proving that sometimes, the most effective exercises integrate into everyday life.