Đề ôn thi Đề thi vào lớp 10 Trường THPT Chuyên KHXH môn Tiếng Anh - Mã đề KHXH-134

Have you ever wondered how you can run, jump, or even just smile? All these actions are possible thanks to our muscular system. This complex network allows us to (35) __________ a huge variety of movements, from lifting heavy objects to blinking our eyes. These are our voluntary muscles, which we control consciously. Our brain sends signals along nerves, telling these muscles when to act.

Each muscle is made of thousands of tiny strands called muscle fibers. When a muscle receives a signal from the brain, its fibers shorten, or contract. This contraction creates a pulling force. It’s important to remember that muscles can only pull; they cannot push. To create movement, they must work with bones and joints, pulling on them to move parts of the body. This is (36) __________ fundamental principle of biomechanics.

Because muscles can only pull, they must work in pairs to create movement in opposite directions. (37) __________, when you bend your arm, your bicep muscle contracts and pulls your lower arm up. At the same time, its partner muscle, the triceps, relaxes. To straighten your arm, the opposite happens. The triceps contracts and the bicep relaxes. They need to (38) __________ each other to allow for smooth motion.

Besides voluntary muscles, we also have involuntary muscles that work automatically. Your heart, for instance, is a powerful muscle that works without you thinking about it. It has to keep pumping blood to all parts of your body, so it truly has to (39) __________. Our body depends on these muscles to continue (40) __________ even when we are asleep.

A fitness expert once explained that a client asked him how he (41) __________ so strong. He told them it was all about understanding these muscle pairs. If we did not have muscles working together in pairs, every movement (42) __________ much more difficult and less controlled. This clever system of contracting and relaxing partners is what gives us the ability to perform everything from simple gestures to complex athletic feats.

In Vietnam, the pressure to excel academically is a major part of every teenager's life. Long hours are spent studying to secure a good future. However, an equally important part of development happens outside the classroom, on the football pitch, the badminton court, or the basketball court. While academic success is a high priority, balancing it with physical activity is not just a hobby; it is a vital strategy for a healthier, more successful life. But why exactly is playing sports so beneficial for students navigating the challenges of their teenage years?

Firstly, the connection between physical activity and mental well-being is undeniable. When you play a sport, your body releases endorphins, which are natural chemicals that act as stress relievers and mood elevators. This reduction in stress is directly linked to an improved ability to concentrate in class and absorb new information. Furthermore, sports require strategic thinking and quick decision-making, which sharpen the mind. This mental training is an essential skill that benefits students in their studies and beyond, helping them to think more clearly under pressure.

Beyond individual benefits, team sports are a powerful tool for social development. They provide a unique environment where teenagers learn to work together towards a common goal. This involves developing crucial communication and cooperation skills. Learning to trust and rely on teammates, some of whom may come from different backgrounds, builds strong friendships and a sense of community. Importantly, sports teach valuable lessons in sportsmanship. Players learn how to win with humility and, perhaps more importantly, how to lose with dignity. They are life lessons that build character and resilience.

Recognizing these advantages, communities are making sports more accessible. In major cities like Da Nang and Hanoi, it's now common to see public parks equipped with outdoor exercise machines and well-maintained spaces for sports like football or shuttlecock kicking. This movement ensures that the benefits of physical activity are not limited to students who can afford to join private clubs. It encourages a community-wide culture of health and activity, where people of all ages can stay active together.

In conclusion, integrating sports into a busy academic schedule is not a distraction but a crucial investment in a teenager's overall development. The physical, mental, and social benefits work together to create more resilient, focused, and well-rounded individuals. So, whether it's joining the school's basketball team or just playing badminton with friends in the park, finding a physical activity you enjoy is one of the most important lessons you can learn beyond the classroom.