Đề ôn thi Đề thi vào lớp 10 Trường THPT Chuyên KHXH môn Tiếng Anh - Mã đề KHXH-79

The respiratory system is complex, but one of its most important parts is a muscle that many people don't think about: the diaphragm. The diaphragm is a large, dome-shaped muscle that is located just below the lungs, separating the chest from the abdomen. Because of its position, (35) __________ plays a crucial role in the mechanics of breathing. It works tirelessly every second of our lives, making it essential for survival.

When you breathe in, or inhale, your diaphragm contracts and moves down. This movement increases the space inside your chest cavity. This causes a change in pressure that allows your lungs to expand and (36) __________ air. The (37) __________ of the lungs is a direct result of the diaphragm creating more room for them. It is an active process that requires muscular effort.

The opposite happens when you breathe out, or exhale. The diaphragm relaxes and goes up to its original dome shape. As it moves upward, it (38) __________ the air out of the lungs, reducing the space in the chest. For most people, exhaling is a passive process, meaning it doesn't require as much effort. It's often a (39) __________ automatic process than inhaling.

What makes the diaphragm fascinating is its dual-control system. Most of the time, its movement is involuntary, controlled by the part of the brain that manages automatic functions like your heartbeat. However, you (40) __________ also consciously control it, which is how you can hold your breath or take a deep breath on purpose. (41) __________ does it work without our thought, but we can also command it when needed.

(42) __________, the diaphragm is the powerful engine that drives our breathing. Its simple yet effective up-and-down movement, contracting to pull air in and relaxing to push it out, is essential for life. This constant, rhythmic action ensures our body gets the oxygen it needs to function, making the diaphragm a true unsung hero of the human body.

For teenagers across Vietnam, the pressure of the high school entrance exam, or 'Thi vào 10', is immense. In today's digital age, the challenge is not just mastering subjects like Math and Literature, but also conquering a relentless enemy: digital distraction. A single notification from TikTok or a message on Facebook can instantly break a student's concentration, making effective studying feel almost impossible. This constant battle for focus has led many students to look for a modern solution to a modern problem.

The solution has arrived in the form of 'focus mode' applications and browser extensions. These tools are designed with a simple but powerful purpose: to create a digital environment free from interruptions. Apps like Forest, Freedom, or Cold Turkey allow users to temporarily block access to specific websites and applications that they find most distracting. By setting a timer—for example, for a 45-minute study session—a student can ensure that they will not be disturbed by social media or online games until their dedicated study time is over.

The effectiveness of these tools goes beyond simply blocking websites. They create a powerful psychological commitment. When you actively turn on a focus app, you are sending a clear signal to your brain that it is time to concentrate. This conscious decision makes it harder to give in to the impulse to check your phone. Instead of passively letting distractions happen, you take active control over your digital space. Furthermore, many of these focus applications are designed to be user-friendly and integrate smoothly with a student's existing digital devices. Because they are so accessible, students can easily make them a part of their daily study routine.

Interestingly, this trend is not just about individual discipline; it has a strong social component. Many Vietnamese students preparing for 'Thi vào 10' are forming online study groups on platforms like Discord. Within these groups, it's common for members to announce a 'study sprint'. Everyone agrees to activate their focus apps for a set period, creating a sense of shared commitment and accountability. This transforms a potentially isolating activity into a collaborative effort, making it easier for everyone to stay on track.

Ultimately, technology is a double-edged sword. It can be the source of our biggest distractions, but it can also provide the tools to defeat them. For the modern student, learning to use technology to manage focus is not just a helpful trick—it's a fundamental skill. Mastering this 'superpower' is as crucial as mastering any academic subject for achieving success in high-stakes exams and beyond.