Đề ôn thi Đề thi vào lớp 10 Trường THPT Chuyên KHXH môn Tiếng Anh - Mã đề KHXH-56

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.

In bustling Vietnamese cities like Hanoi and Ho Chi Minh City, the sight of delivery drivers in their signature green or orange jackets is now a common part of the urban landscape. Food delivery apps such as GrabFood and ShopeeFood have woven themselves into the fabric of daily life, especially for the younger generation. With just a few taps on a smartphone, a hot meal or a refreshing bubble tea can arrive at your doorstep. This convenience is undeniably attractive, but it also raises important questions about how these services are shaping our eating habits, lifestyles, and even our local communities for better or for worse.

The primary advantage of these platforms is the sheer convenience and variety they offer. In the past, your food choices were limited to what was within walking distance or what you could cook yourself. Now, a world of culinary options is available. You can order a traditional bowl of Phở for lunch and an Italian pizza for dinner without ever leaving your home. This access to a diverse range of restaurants provides an unprecedented level of choice for consumers, catering to every craving and dietary preference. For busy students juggling schoolwork and extracurricular activities, this can be a massive time-saver.

However, this convenience comes with potential downsides that are worth considering. Health experts worry that the ease of ordering may lead to a more sedentary lifestyle, as people walk less to get their food. Furthermore, many of the most popular and heavily promoted items on these apps are often fast food or processed meals, which can negatively impact long-term health if consumed too frequently. Besides health, there is also the environmental cost. Each delivery generates a significant amount of single-use plastic packaging, from containers to cutlery. While they offer incredible convenience, their environmental footprint is a growing concern.

Beyond health and the environment, there's a financial aspect to consider. While an individual meal might seem affordable, the costs can accumulate quickly. Delivery fees, service charges, and the temptation to order more often than you would otherwise can put a strain on a teenager's budget. When you compare the total cost of a delivered meal to that of a home-cooked one or a simple dish from a local street vendor, the difference can be substantial. Managing one's finances responsibly means being aware of these hidden or additional costs.

Ultimately, food delivery apps are powerful tools whose impact depends on how we use them. They offer a remarkable level of convenience and choice that can genuinely improve our daily lives. The challenge lies in using these services mindfully—balancing the ease of a quick delivery with the benefits of a home-cooked meal, a walk to a local eatery, and an awareness of our health, budget, and environmental responsibilities. The future of eating well in the digital age is not about abandoning these apps, but about finding a healthy, sustainable balance.