a. Giá trị sử dụng của đất phù sa:

- Trong ngành nông nghiệp: thích hợp phát triển các loại cây lương thực (lúa, ngô,...), cây công nghiệp hằng năm (dâu tằm, thuốc lá, bông, đậu tương,...) và các loại cây ăn quả.

- Trong ngành thuỷ sản:

+ Vùng đất mặn, đất phèn: thuận lợi đánh bắt thuỷ sản như tôm, cua, cá.

+ Ở các rừng ngập mặn ven biển, các bãi triều ngập nước và cửa sông lớn: thuận lợi nuôi trồng nhiều loại thuỷ sản nước lợ và nước mặn khác nhau, nhiều nhất là cá và tôm.

b. Hiện trạng và nguyên nhân thoái hoá đất:

* Hiện trạng:

- Diện tích đất bị thoái hóa: 10 triệu ha, chiếm 30% diện tích nước ta

- Đất ở trung du và miền núi bị khô cằn, nghèo dinh dưỡng.

- Nguy cơ hoang mạc hoá ở duyên hải Nam Trung Bộ.

- Đất ở vùng cửa sông, ven biển bị suy thoái.

- Diện tích đất mặn, đất phèn tăng lên.

* Nguyên nhân:

- Tự nhiên:

+ Địa hình đồi núi, mưa lớn và theo mùa gây xói mòn, rửa trôi đất.

+ Biến đổi khí hậu làm gia tăng hạn hán, ngập lụt.

+ Nước biển dâng khiến đất bị nhiễm mặn, nhiễm phèn, ngập úng.

- Con người:

+ Phá rừng lấy gỗ, đốt nương làm rẫy.

+ Chưa quan tâm đến cải tạo đất, lạm dụng các chất hóa học trong sản xuất nông nghiệp.

Topic 4: Talk about a planet you like.

I like Mars. It's called the "Red Planet" because it looks red in the sky. Scientists send robots to Mars to learn more about it. They want to see if there is any water or if people could live there one day. It's cool to think about exploring other planets and what we might find there! I like looking at pictures of Mars and imagining what it would be like to visit. Maybe one day we'll be able to go there and see it for ourselves!

Question 1: Yes, I like shopping. It's fun to buy things I need or like. I enjoy going to the store and looking at all the different products. 

Question 2: I shop online sometimes, maybe once or twice a month. It's easy and saves time. I can buy things without leaving my home. It's convenient, especially for things like clothes.

Question 3: I usually talk to my friends using my phone. We send messages or talk on social media. Sometimes, we also call each other or do video calls to see each other's faces. 

Question 4: Sometimes, I don't like how much I use my phone. It can be too much and distract me. I find myself spending a lot of time on my phone, even when I should be doing other things.

Question 5: I don't think robots will take over from teachers. Teachers understand our feelings, help us when we're stuck, and make learning fun. Robots can help, but they can't replace everything a teacher does.

In Vietnam, floods are a common problem, especially when it rains a lot. During the rainy season, which usually happens from May to October, heavy rain falls across the country. This makes the rivers and streams overflow, and water spreads over the land, causing floods in many places. The floods can be really dangerous. They can destroy houses, roads, and farms, and sometimes people even get hurt or have to leave their homes. The government tries to help by building things like dams and levees to control the water and warn people when floods are coming. But still, floods can be a big problem for many people in Vietnam, so it's important for everyone to be ready and stay safe when it rains a lot.

Question 1: He asked the villagers how often earthquakes occurred in that region. 

Question 2: They told me (that) I could find a wide range of beauty products in their store.

Question 1: I think robots can’t replace the role of teachers in education. 

Question 2: People will still send letters to each other in 2050.

Question 1: The boys said they were picking up litter on the beach then. 

Question 2: Before Lucas arrives at the restaurant, we won’t order our meals.

Translation machines are one of the greatest inventions. First, they are very helpful for travellers because travellers can quickly translate signs, menus, and directions. This makes getting around in new places easier. Second, they help people from different countries understand each other better. This means we can share ideas and work together more easily. Third, translation machines are great tools for learning new languages. You can use them to translate words and phrases, which helps you practise and improve your language skills. In conclusion, translation machines are an amazing invention that makes travelling, communicating and learning easier.

Question 1: During a flood, you should listen to instructions from local authorities.

Question 2: Mars is one of the most promising planets for life in our/the solar system.