🎧 Listen to today’s story
📚 Key Words
| Word | Meaning | 中文 |
|---|---|---|
| material | What something is made of. | 物质 |
| sponge | A soft object that can soak up liquid. | 海绵 |
| net | Strings joined together with holes in between. | 网 |
| scientists | People who study how the world works. | 科学家 |
| soil | The top layer of earth where plants grow. | 土壤 |
| contact lenses | Small plastic pieces you wear on your eyes to see better. | 隐形眼镜 |
| healthy | Feeling well and not being sick. | 健康的 |
| planet | A large round object in space, like Earth. | 行星 |
📖 Read the story
Hydrogels are amazing materials. They work like a sponge because they can hold a lot of water and stay wet. Imagine a net made of tiny strings. This net catches and holds water easily. You can even find hydrogels at home. For example, sweet jelly is a type of hydrogel! Scientists use hydrogels in many ways. Some gels can get drinking water from the air. This helps people who live in dry places. Farmers also use them to keep the soil wet so plants can grow better. Doctors use hydrogels too. They make contact lenses for eyes and even new body parts. This is possible because our bodies are mostly water, just like the gels. Hydrogels are very soft and safe for humans. They help people stay healthy and look after our planet. Hydrogels are small, but they do big things for our world!
✏️ Answer the questions
1. What does a hydrogel act like?
- A.A hard rock
- B.A soft sponge
- C.A metal spoon
- D.A dry piece of wood
2. What is an example of a hydrogel you can find in your kitchen?
- A.Milk
- B.Bread
- C.Jelly
- D.An apple
3. How do hydrogels help farmers?
- A.By making the sun shine
- B.By keeping the soil wet
- C.By killing bad insects
- D.By making the air cold
4. Why do doctors use hydrogels for body parts?
- A.Because our bodies are mostly water
- B.Because they are very expensive
- C.Because they are hard like bone
- D.Because they are a bright color
5. Where can some gels get drinking water from?
- A.From the air
- B.From deep rocks
- C.From the moon
- D.From fire