Đề ôn thi Đề thi vào lớp 10 Trường THPT Chuyên KHTN môn Tiếng Anh - Mã đề KHTN-55

(23) __________ . These factors combine to make this simple activity a powerful tool for maintaining health. It's a convenient and effective way to stay active. (24) __________

Every autumn, many bird species prepare to (25) __________ a long journey south. This annual movement, known as migration, is a fundamental survival instinct. The primary reason for this behavior is the change in seasons. As winter approaches in the northern hemisphere, temperatures drop and food becomes less (26) __________. Insects disappear, and plants stop producing fruit, making it difficult for birds to find enough to eat. To survive, they must move to warmer climates. This strong instinct helps them avoid (27) __________ in the harsh winter conditions.

The journey itself is often the (28) __________ challenge of their lives, covering thousands of kilometers over oceans and continents. Young birds, making the trip for the first time, follow their parents. Amazingly, they seem to know the route (29) __________; it’s a natural ability. They find new food sources and a safe place to live until spring returns. (30) __________ is a remarkable strategy that has been perfected over thousands of years.

Many Vietnamese students feel immense pressure to succeed academically. A common belief is that staying up late to study, especially before an exam, is a necessary sacrifice. This 'all-nighter' culture is widespread among teenagers who think that more hours spent with books will guarantee better grades. However, is this really an effective strategy for learning?

Neuroscience provides a clear answer: sleep is crucial for academic success. During sleep, our brains are surprisingly active, working hard to process the day's information in a process called memory consolidation. This happens during different sleep stages, especially deep sleep and REM (Rapid Eye Movement) sleep. Without enough of these stages, this vital process is interrupted, meaning that much of what you studied might not be properly stored in your long-term memory.

The consequences of sleep deprivation go beyond just feeling tired. When you don't get enough rest, your cognitive abilities suffer. Your ability to concentrate is significantly reduced, your thinking becomes slower, and your problem-solving skills are diminished. This means that even if you spent many hours studying, you might struggle to access that information effectively during an exam. In contrast, a well-rested brain is quicker, more creative, and better at recalling facts.

Ultimately, sacrificing sleep for extra study hours is a counterproductive strategy. Health experts and even government bodies, like those in Ho Chi Minh City who have adjusted school start times, recognize this growing problem. A smarter approach is to plan your study schedule well in advance, review material consistently, and protect your sleep time. This ensures your brain has the time it needs to consolidate your learning and perform at its best.

Organic farming is gaining popularity as a more sustainable way to grow food. It avoids synthetic pesticides and fertilizers, focusing instead on natural processes to protect the environment. (37) __________.

One of the biggest advantages is its positive impact on wildlife. (38) __________. However, there is a significant debate about whether this method is efficient enough. (39) __________. This lower productivity raises a critical question: can we feed a growing global population using only organic methods, or will we need a combination of approaches? (40) __________.

A. Critics point out that organic crop yields are frequently lower than those from conventional farming

B. Finding this balance is one of the most important agricultural challenges of our time

C. This approach helps maintain soil health and reduces water pollution

D. Organic farms often support greater biodiversity because they provide a safer habitat for insects and animals