Đề ôn thi Đề thi vào lớp 10 Trường THPT Chuyên KHXH môn Tiếng Anh - Mã đề KHXH-36

Wildfires are powerful natural events that can change landscapes dramatically. While (35) __________ wildfires are started by humans, often accidentally, nature has its own ways of igniting forests. These natural fires play a complex role in the ecosystem, clearing out old vegetation to make way for new growth. This passage will focus exclusively on how these fires begin without any human involvement.

The most common natural cause is a lightning strike, (36) __________ is essentially a massive spark of electricity from the atmosphere. During a thunderstorm, a bolt of lightning can hit a tree or the ground with incredible force and heat. This powerful energy (37) __________ into the ground in a fraction of a second, and its temperature can be hotter than the surface of the sun.

(38) __________, a lightning strike alone is not enough. The conditions on the ground must be just right for a fire to ignite. If the vegetation is extremely (39) __________ and there is plenty of fuel like dead leaves, pine needles, and grass, the heat from the lightning can easily start a flame. These materials are highly flammable when they lack moisture.

Once a fire starts, it can (40) __________ very quickly, especially if there is strong wind. Wind provides the fire with more oxygen and pushes the flames into new areas of fuel. The type of land is also important, as fires move faster up hills (41) __________ to the way heat rises. This combination of factors determines how large and intense a wildfire becomes.

In conclusion, the creation of a natural wildfire is a perfect storm of events. It requires a powerful ignition source, like a lightning strike, and very dry, flammable conditions on the ground. This combination can have a huge (42) __________ on the environment, reminding us of the immense power of natural forces.

Have you ever finished a TV series on a streaming service like Netflix and felt a sense of surprise when the perfect recommendation appears almost instantly? It can feel like the service is reading your mind, suggesting a 'phim bộ' (TV series) that you were just thinking about. This isn't magic; it's the result of a highly complex and powerful system known as a recommendation algorithm, which is designed to understand your unique viewing preferences and keep you watching.

The foundation of this system is data – a massive amount of it. Every time you interact with the service, the algorithm is learning. It tracks which shows and movies you watch, which genres you prefer, what time of day you typically watch, and even the device you use. But it goes much deeper than that. Services like Netflix also meticulously analyze when you pause, rewind, or re-watch a particular scene. They even track when you abandon a show midway through an episode. This behavioral data provides a rich, detailed picture of your viewing habits.

One of the most common techniques these algorithms use is called 'collaborative filtering'. The system analyzes your viewing data and compares it to millions of other users. It identifies other users who have similar tastes to you and groups you all into what can be called a 'taste cluster'. For example, if you and many other people in Vietnam enjoyed the action series 'Hai Phượng' (Furie), you are likely part of a similar taste cluster.

Once you are part of a cluster, the algorithm works its magic. it looks at the viewing history of other people in your group to find movies and shows that they loved but you haven't seen yet. If many people in your cluster who watched 'Hai Phượng' also watched and highly rated a new Korean thriller, the algorithm predicts that you will probably enjoy that thriller too. This is how services can so often recommend a hidden gem that you might never have found on your own.

The personalization doesn't stop at show titles. The system even customizes the artwork or thumbnail it shows you for a movie or series. It might conduct A/B tests, showing different images to different users in the same cluster to see which one gets more clicks. By understanding how these sophisticated systems work, you become a smarter viewer. You're no longer just a passive consumer, but someone who understands the technology shaping your entertainment choices, helping you to discover new content more effectively.