Đề ôn thi Đề thi vào lớp 10 Trường Phổ thông Năng khiếu môn Tiếng Anh - Mã đề PTNK-35

Energy conversion is a fundamental (21) __________ of science. It explains how energy, which is the power to do work, changes its form. Energy exists in (22) __________ different forms, such as chemical, electrical, light, and heat. The most important rule to remember is that energy cannot be created or destroyed; it simply changes from one form (23) __________ another. This idea is central to understanding physics and the world around us.

So, what does it mean to 'convert' energy? To convert means to change something from one form or character into another. This process of transformation is called energy conversion, and it takes place constantly. When we talk about using energy, we are usually talking about converting it. For instance, we turn electrical energy into light energy to see in the dark.

Everyday objects are great examples of energy conversion. For example, a lamp is a simple device that converts electrical energy into light and heat. Similarly, a plant uses photosynthesis to change light energy from the sun into chemical energy, which it stores in its leaves and stem. Even a moving car turns the chemical energy in fuel into kinetic energy, the energy of motion.

Our own bodies are amazing energy converters. The chemical energy from the food we eat (24) __________ into kinetic energy for movement, which allows us to walk, run, and play sports. Moreover, some of this energy becomes heat, which helps maintain our body temperature, keeping us warm even on a cold day. This conversion is always happening inside us.

In conclusion, energy conversion is a process that happens everywhere, from the smallest plant to the largest power station. Understanding energy conversion is essential for seeing how the world works, from our technology to our own biology. It is not about making new energy, but about transforming the energy that already exists into a form that is useful for a specific purpose.

TikTok has emerged as a global stage where short, viral dance challenges dominate youth culture and redefine music promotion. A trending dance move can launch a song into superstardom overnight, from pop hits to indie tracks. Characterized by brevity, repetitive movements, and ease of replication, these challenges are incredibly accessible to anyone with a smartphone. They foster shared participation across continents, allowing millions to engage dynamically with popular culture. Yet, while undeniably fun, this pervasive trend also raises questions about the creative demands it places on participants.

For many teenagers, TikTok dance challenges offer a vibrant outlet for self-expression and connection. Learning new steps and recording your own version is an engaging process, combining physical activity with digital creativity. It’s a chance to join a global conversation, share your unique flair, and connect with friends, even collaborating on routines. The sheer accessibility means professional training isn't required; enthusiasm and willingness to try suffice. This democratic aspect transforms casual viewers into active creators, fostering community around shared interests.

Vietnam has significantly contributed to this global dance phenomenon, showcasing powerful local talent. A prime example is the "Ghen Cô Vy" (Jealous Coronavirus) song and its accompanying dance. Created by choreographer Quang Đăng during the pandemic's early days, this public health message transformed into an unexpected global viral sensation. [I] This success highlighted Vietnamese ingenuity and the platform's capacity to amplify important messages through entertaining, shareable content. [II]

Despite the apparent fun, the constant influx of new dance challenges can also create hidden pressure, especially for teens. [III] There’s an unstated expectation to keep up, learn the latest moves, and produce content that performs well. This often leads to self-comparison, anxiety about not being "good enough" or "viral enough," and a feeling that creativity is dictated by trends, not personal inspiration. What starts as a casual pastime can morph into a source of stress, turning enjoyment into an obligation to constantly prove oneself digitally. [IV]

Ultimately, TikTok dance challenges offer both exciting avenues for creative expression and potential pitfalls of pressure. For 14-15 year olds navigating online identities, recognizing this duality is vital. Enjoy the thrill of learning new dances and connecting with friends, but be mindful of subtle demands to conform or achieve virality. True enjoyment stems from genuine participation and self-expression, not from chasing fleeting trends or self-comparison. Engaging with these challenges should remain a fun, personal choice, rather than an external expectation to constantly perform.