Đề ôn thi Đề thi vào lớp 10 Phú Thọ môn Tiếng Anh - Mã đề PTH-61

Have you ever wondered how a QR code works? At (15) __________, a QR code seems like just a random pattern of black and white squares, but it actually holds a surprising amount of information. QR, which stands for 'Quick Response', highlights how these codes are designed to be read quickly by a device like your smartphone. In fact, they can store significantly (16) __________ information than the traditional barcodes you see on products at the supermarket.

The process is quite clever. A camera or scanner captures the image, and special software analyzes the unique pattern. This allows the device (17) __________ the hidden data, which could be anything from a website link to Wi-Fi login details. The (18) __________ of the data happens almost instantly. Once the pattern is decoded into readable text or a command, the information is presented to the user. (19) __________ means you can access a menu or pay for a coffee in seconds. It’s no surprise that QR codes have become an essential tool to (20) __________ our digital lives.

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.