Đề ôn thi Đề thi vào lớp 10 Phú Thọ môn Tiếng Anh - Mã đề PTH-91

Our ability to hear is something we often take for granted, but the process is quite amazing. It all starts when sound waves (15) __________ our ears. These waves travel down the ear canal and cause the eardrum to vibrate. This is similar to how a drum skin moves when you hit it.

Next, these vibrations are passed to three tiny bones in the middle ear. These bones amplify the vibrations, making them (16) __________ for the next stage. Inside the inner ear, a snail-shaped part called the cochlea performs a crucial task. It converts the vibrations into electrical signals. (17) __________ is where the magic truly happens, transforming physical movement into a language the brain can understand. The auditory nerve then carries these signals to the brain. The brain’s job is to finish (18) __________ the signals, which allows us to identify sounds like a friend’s voice or our favorite song. It's a process that happens (19) __________, almost instantly. It’s truly incredible that our brains can perform such a (20) __________ task so effortlessly.

Originally from South America, the Golden Apple Snail (GAS) was introduced to Asia, including Vietnam, in the 1980s. People initially thought it could be a valuable food source for farmers. However, this seemingly good idea quickly became a significant environmental and agricultural challenge. Snails that escaped or were released into the wild found the warm, wet conditions of rice paddies to be a perfect new home, leading to severe consequences.

The primary issue with the GAS is its diet. These snails have a strong preference for young rice seedlings, which are essential for a successful harvest. A large population can destroy a rice field in a short time, threatening farmers' livelihoods. Furthermore, these creatures reproduce rapidly, laying bright pink egg clusters on plants above water. Each cluster contains hundreds of eggs, allowing their numbers to explode and spread quickly.

The impact of this invasive species is twofold. Economically, it causes major losses for the rice industry, a key part of Vietnam's economy. Environmentally, the snail disrupts the natural balance of the paddy ecosystem. Because the GAS is so harmful to crops, government bodies like the Plant Protection Department work on methods to manage its population. This includes encouraging farmers to collect the snails and their eggs manually.

The story of the Golden Apple Snail is a powerful lesson about invasive species. It shows how introducing a non-native animal, even with good intentions, can create a huge and costly problem. This case reminds us of the delicate balance in our local ecosystems and why we must protect them. It highlights how one environmental change can affect the food we eat and the people who grow it.