Đề ôn thi Đề thi vào lớp 10 Trường Phổ thông Năng khiếu môn Tiếng Anh - Mã đề PTNK-43

Blood is an essential fluid that circulates throughout our bodies, delivering necessary substances like nutrients and oxygen to tissues. It is a complex mixture, but two of the most important components are red blood cells and white blood cells. Each type has a unique and vital mission to perform.

Red blood cells, also known as erythrocytes, have a very specific job. They are (21) __________ for transporting oxygen from the lungs to the rest of the body. This critical task is possible because they contain a special protein called hemoglobin, (22) __________ gives them their characteristic red color. In terms of numbers, there are many more red blood cells than any other type of cell, making up about 45% of the blood's total volume.

White blood cells, or leukocytes, have a completely different purpose. Their primary role is to protect the body against illness and disease. As key players in the immune system, they actively (23) __________ infection by attacking bacteria, viruses, and other harmful invaders. Unlike red blood cells, they do not contain hemoglobin, are generally larger in size, and have a nucleus.

The differences between these two cell types are significant. Red blood cells focus on oxygen delivery and are incredibly numerous. Whereas, white blood cells act as the body's defenders and are much fewer in number. A healthy body maintains a careful balance between them, and a major change in this ratio can affect a person's overall health.

In conclusion, even though their functions are distinct, both red and white blood cells (24) __________ a crucial role in keeping us healthy. They are teammates in the circulatory system, and understanding their different jobs helps us appreciate the amazing and complex way our bodies operate to sustain life.

Flappy Bird, a name synonymous with addictive frustration and unprecedented success, captivated millions globally in early 2014. [I] Behind this global phenomenon was Nguyễn Hà Đông, a Vietnamese independent game developer from Hanoi. His creation, born from a straightforward concept, quickly demonstrated how a single individual, without a massive studio, could capture the world's attention.

The game's mechanics were deceptively simple: tap the screen to make the bird flap its wings and avoid obstacles. There were no elaborate graphics or complex storylines. Yet, its brutal difficulty and highly addictive nature created a unique appeal. [II] Players found themselves returning repeatedly, driven by the challenge of beating their last meager score. This minimalist design, combined with viral spread through social media, defied conventional wisdom about what made a mobile game successful, proving that simplicity could be a key to global reach.

Nguyễn Hà Đông himself expressed surprise at Flappy Bird’s explosive popularity. The sheer scale of its success, with millions of downloads and significant daily ad revenue, brought unexpected pressures. Reports suggested the developer was overwhelmed by the attention and sudden fame. In an unprecedented move that shocked the tech world, Đông decided to remove Flappy Bird from app stores just a month after its peak. He cited the game's addictive nature and intense scrutiny as reasons, preferring a quieter life away from the spotlight.

Flappy Bird's meteoric rise was particularly significant for Vietnam. [III] It showcased the immense talent and potential within the country's burgeoning tech scene. A game developed by a lone individual from Hanoi proved that innovation wasn't confined to Silicon Valley or established gaming giants. It put Vietnam squarely on the map as a hub for digital creativity and independent development, inspiring a new generation of local programmers and designers to pursue their ideas. This quiet success story resonated deeply, highlighting what was possible with dedication and a fresh perspective.

For 14 and 15-year-olds contemplating a future in coding, game design, or digital innovation, the Flappy Bird story offers a powerful lesson. It demonstrates that a brilliant, globally impactful idea doesn't necessarily require vast resources or a large team. Simplicity can be a virtue, and a unique, engaging concept, even a challenging one, can resonate widely. [IV] Nguyễn Hà Đông's journey proves that a single person with a passion and a laptop can create something that touches millions, inspiring aspiring creators to believe in their own potential to make a difference in the digital world.