Đề ôn thi Đề thi vào lớp 10 Trường THPT Chuyên KHXH môn Tiếng Anh - Mã đề KHXH-142

Have you ever wondered how bats can fly so well in the dark? Most bats are nocturnal, which means they (35) __________ for food at night. To navigate in total darkness, they don't rely on their eyes. Instead, they use a remarkable skill (36) __________ allows them to 'see' with sound. This amazing ability is known as echolocation.

The process begins with the bat itself. First, a bat produces a series of (37) __________ short, high-pitched squeaks from its mouth or nose. These sounds are too high for humans to hear. (38) __________, for a bat, they are the key to navigating in darkness. The bat sends these sound waves out into the environment.

The sound waves travel through the air until they hit an object, like a wall or a small insect. After hitting an obstacle, the sound waves bounce (39) __________ towards the bat. This returning sound is called an echo. The time it takes for the echo to return tells the bat how far away the object is.

This is where the bat's amazing hearing has a powerful (40) __________. Its large ears are able to collect these faint echoes. By interpreting the tiny differences in the echoes, the bat's brain can (41) __________ a detailed mental map of its surroundings. It can determine an object's size, shape, and even its texture.

In conclusion, echolocation is an incredibly effective system. Using this ability, a bat is able to find prey and avoid (42) __________ different kinds of obstacles, all without needing any light. It is a perfect example of how animals adapt to their environment in order to survive.

The goal of walking 10,000 steps a day has become a global fitness phenomenon. You see it everywhere: on fitness trackers, in health apps, and promoted by wellness influencers. For many people, especially teenagers who walk to school or between classes, tracking steps seems like an accessible and free way to improve health. But is this number a magic formula for fitness, or is there more to the story? This has become a significant question as more people adopt this popular target.

Surprisingly, the 10,000-step target did not come from scientific research. It was initially a marketing tool. In the 1960s, a Japanese company created a device called a pedometer, and their marketing campaign promoted the 10,000-step goal to sell it. Despite its commercial origins, walking this much does have real health benefits. Regular walking is proven to improve cardiovascular health, boost your mood, and help with weight management. It's an excellent starting point for anyone looking to become more active.

However, experts now suggest that focusing only on the number of steps can be misleading. The intensity of the exercise matters just as much, if not more. A slow, casual walk is not the same as a brisk power walk that gets your heart rate up. For teenagers who are already quite active through sports or other activities, hitting 10,000 steps might be less important than ensuring some of their daily activity is vigorous. The 10,000-step target is a great motivator, but we need to understand what it truly represents: a general guideline for an active lifestyle, not a strict medical command.

This idea of encouraging daily movement is visible in Vietnam. In cities like Hanoi, the creation of pedestrian-only zones, such as the Hoan Kiem Lake walking street on weekends, is a perfect example. These dedicated spaces encourage people to leave their motorbikes behind and enjoy walking. This, in turn, promotes a culture of community fitness, where families and friends can be active together in a safe and pleasant environment. It shows that integrating movement into daily life can be a social and enjoyable activity.

In conclusion, while the 10,000-step goal is a fantastic and simple motivator, it shouldn't be seen as the only measure of fitness. The key is to be mindful of your overall activity level. A better approach is to focus on consistency and include some moderate-intensity exercise in your routine. Instead of just counting steps, think about adding a 30-minute brisk walk to your day. The ultimate goal is not just to hit a number, but to build a sustainable habit of staying active for a healthier life.