Đề ôn thi Đề thi vào lớp 10 Hà Nội môn Tiếng Anh - Mã đề HN-20

(23) __________ The experience begins in the tropical zone, a world of dense foliage and high humidity. As you follow the winding path, the environment gradually transforms, preparing you for the next distinct biome. (24) __________

Many people are switching from manual to electric toothbrushes because they believe they are more effective. But how do they work? An electric toothbrush has a small motor inside its handle. When you (25) __________ on the power, this motor creates rapid vibrations or rotations. These movements are transferred to the brush head, which has bristles (26) __________ move back and forth or in circles at a very high speed.

This rapid motion allows the toothbrush to (27) __________ thousands of brush strokes per minute, far more than you could achieve manually. (28) __________, it can remove plaque more efficiently. Many models also include timers to ensure you brush for the recommended two minutes. Some advanced brushes even have pressure sensors. If too much pressure is applied, the user is alerted, which helps to (29) __________ the gums from damage. Overall, the technology that (30) __________ in an electric toothbrush makes daily dental care easier and more thorough for many users.

Imagine drawing a detailed object on your computer and then, with the click of a button, watching a machine build it right before your eyes. This is the magic of 3D printing, also known as additive manufacturing. Unlike traditional methods that cut or carve material away, 3D printing builds objects layer by layer from a digital design. This technology is transforming industries from healthcare to engineering, and now it's making its way into the classroom.

For students, 3D printing opens up a new world of possibilities for schoolwork. Instead of just drawing a diagram, a biology student can print a detailed model of a human heart. For geography, you can create precise models of mountains and valleys, known as topographic maps. Art students can design and print unique sculptures or custom jewelry. This hands-on approach makes learning more engaging and helps students better understand abstract concepts by turning them into physical objects they can hold.

This wave of innovation is also present in Vietnam. Leading institutions like the Hanoi University of Science and Technology have set up 'Fab Labs' (Fabrication Laboratories) to give students access to this technology. These labs encourage students to move beyond simple school assignments and start tackling more complex challenges, preparing them for future careers in science and technology. It creates a bridge between theoretical knowledge learned in class and practical, real-world application.

Ultimately, the goal of bringing 3D printing into schools is not just to make interesting models. It's about empowering students to become creators and problem-solvers. When students can design, test, and refine their own creations, they learn valuable skills in critical thinking and perseverance. This technology shifts the focus from being a passive consumer of information to an active participant in the process of innovation, turning your imagination into reality.

Dams are often celebrated as sources of clean, renewable energy. However, their construction sets off a complex ecological chain reaction. When a river is blocked, a large reservoir forms behind the dam, flooding vast areas of land and destroying terrestrial habitats. (37) __________. Fish that migrate upstream to spawn, such as salmon, can no longer complete their life cycle. (38) __________.

Furthermore, dams trap sediments that would naturally flow downstream. (39) __________. The altered water flow and temperature below the dam also create an unnatural environment. (40) __________.

A. Without this regular supply of nutrients, the fertile land in downstream deltas can erode and shrink

B. The dam itself becomes a physical barrier, which is a major problem for many aquatic species

C. As a result, many native plants and fish struggle to survive, changing the ecosystem forever

D. This disruption affects not only the fish populations but also other animals in the food web