Đề ôn thi Đề thi vào lớp 10 Trường THPT Chuyên KHTN môn Tiếng Anh - Mã đề KHTN-48

(23) __________. Then, a wave of relief washed over me as I remembered my work was auto-saved to the cloud. I quickly logged in on my friend's laptop and submitted the project with seconds to spare. (24) __________

Sea salt harvesting is a fascinating process that has been used for thousands of years. The principle is simple: use the sun's energy to evaporate seawater. To do this, workers create large, shallow ponds called salt pans near the coast. (25) __________ of these salt pans are needed to produce a significant quantity of salt. The entire process relies heavily (26) __________ the sun and wind.

First, seawater is channeled into the pans. Then, the sun's heat and the wind work together. This natural process has a profound (27) __________ on the final product. (28) __________, as the water disappears, it leaves behind concentrated brine. Eventually, only pure salt crystals remain. Farmers must carefully (29) __________ changing weather conditions, as unexpected rain can ruin the harvest. If it didn't rain for months, the process would be much easier. However, if there (30) __________ no sun at all, harvesting salt this way would be impossible.

In sprawling urban centers, often called "concrete jungles," green spaces are scarce. This separation from nature affects our food supply, as most produce travels hundreds of kilometers to reach city markets. However, a global movement is changing this. Urban agriculture, particularly rooftop gardening, is transforming unused city spaces into productive green oases, offering a fresh solution to an old problem.

The benefits of rooftop farming are numerous. Firstly, it provides city residents with access to incredibly fresh, nutritious produce, often harvested just moments before it's eaten. This local production dramatically cuts down on the environmental costs associated with long-distance food transportation. Furthermore, these innovative gardens can become community hubs, bringing neighbors together to share in the work and the harvest, strengthening social bonds.

This trend is gaining popularity in Vietnam. In bustling cities like Da Nang and Ho Chi Minh City, community projects and private companies are helping people set up their own gardens. They move away from conventional farming methods that require large fields and instead use smart systems like hydroponics on rooftops. These local initiatives show that producing food in the city is not just a dream but a practical reality.

While starting a rooftop garden may present challenges, such as initial setup costs and the need for some technical knowledge, the movement continues to grow. For teenagers, it offers a powerful way to reconnect with their food source and understand the environment. It proves that even in a crowded city, a small patch of green on a roof can make a big difference for our plates and our planet.

Have you ever felt an urgent need to buy a product just because it was 'limited edition'? This popular marketing strategy creates what is known as artificial scarcity. (37) __________. Brands achieve this by releasing only a small number of items. The fear of missing out, or FOMO, then plays a significant role in driving consumer behavior.

(38) __________. This psychological pressure makes people rush to purchase before the item is gone forever. The hype is further amplified on social media. (39) __________. This online visibility generates more excitement, causing drops to sell out in minutes. (40) __________.

A. Influencers often showcase these exclusive products, confirming their desirable status

B. This success reinforces the idea that the products are must-have items

C. When an item is hard to get, its perceived value often increases dramatically

D. This means the rarity is intentionally created by the company, not due to a lack of resources