Đề ôn thi Đề thi vào lớp 10 Hà Tĩnh môn Tiếng Anh - Mã đề HTI-80

Have you ever thought about what powers your breath? The diaphragm is (24) __________ important muscle for this job. Located below your lungs, this large, dome-shaped muscle works tirelessly. We often don't think about it and just (25) __________ that our breathing happens on its own.

When you inhale, your diaphragm contracts and flattens, moving downwards. This creates more space in your chest, allowing your lungs to expand and fill with air. (26) __________ is the fundamental mechanism that lets you breathe in. The whole process is almost completely (27) __________; your brain controls it without you needing to think about (28) __________. When you exhale, the diaphragm relaxes, moves up, and helps push the air out.

Besides breathing, the diaphragm can also (29) __________ in other actions like coughing, sneezing, and even singing. A strong diaphragm supports good respiratory health, so it’s more than just a breathing muscle!

Can you imagine waiting five minutes for a single song to download? For your parents, this was normal. Before today's lightning-fast internet, connections were slow and unreliable. Now, for teenagers in Vietnam and across the world, high-speed internet is essential for studying, gaming, and streaming videos. This massive change didn't happen overnight; it was the result of an incredible technological journey that transformed how we connect to the digital world.

In the past, most homes connected to the internet using dial-up or ADSL technology, which sent data through old copper telephone lines. This system was slow and had many limitations. For example, you couldn't use the house phone and the internet at the same time. As more people started using the internet for complex tasks, this copper-wire system quickly became obsolete and unable to meet the growing demand for faster speeds.

The solution was fiber optic technology. Instead of sending electrical signals through copper, fiber optic cables use thin strands of glass to transmit data as pulses of light. Because light travels so fast, this method is significantly quicker and more stable. Fiber optic technology is a superior way to deliver internet, as it can handle massive amounts of data without losing speed. This innovation is the primary reason you can watch high-definition movies without any buffering.

In Vietnam, this digital transformation has been remarkable. Companies like FPT Telecom and VNPT have worked hard to replace the old copper infrastructure with modern fiber optic networks, even in remote areas. This nationwide effort has provided millions of young Vietnamese people with the powerful tools they need to learn, create, and connect with the world, all made possible by tiny strands of glass carrying light.