🎧 Listen to today’s story
📚 Key Words
| Word | Meaning | 中文 |
|---|---|---|
| shiny | Bright and reflecting light. | 发光的 |
| rust | A reddish-brown substance that forms on iron or steel. | 生锈 |
| metal | A hard material like gold, silver, or iron. | 金属 |
| oxygen | A gas in the air that we need to breathe. | 氧气 |
| atom | The smallest part of any object. | 原子 |
| position | The place where something is. | 位置 |
| hexagon | A shape that has six straight sides. | 六边形 |
| material | What something is made of. | 材料 |
📖 Read the story
Think about a gold ring. It is always shiny and bright. But other metals like steel can rust. Rust is a brown layer that grows on metal. This happens when oxygen in the air touches the metal. Why is gold different? Scientists now have the answer. It is because of tiny things called atoms. Atoms are like very small building blocks. On gold, these atoms change their positions. They move from a square shape into a hexagon shape. A hexagon is a shape with six sides. This special shape stops oxygen from sticking to the gold. Because the oxygen cannot stick, the gold does not rust. It stays clean and beautiful for a long time. This is very exciting news. It helps scientists understand how to make better materials in the future. Gold is a very special metal!
✏️ Answer the questions
1. What happens when oxygen touches metals like steel?
- A.They turn into gold.
- B.They can rust.
- C.They become very big.
- D.They disappear.
2. What are atoms compared to in the text?
- A.Small building blocks.
- B.Shiny gold rings.
- C.Six-sided boxes.
- D.Large machines.
3. What special shape do atoms on gold make?
- A.A square.
- B.A circle.
- C.A hexagon.
- D.A triangle.
4. How many sides does a hexagon have?
- A.Four
- B.Five
- C.Six
- D.Eight
5. Why does gold stay clean and beautiful?
- A.Because it is very expensive.
- B.Because oxygen cannot stick to it.
- C.Because people wash it every day.
- D.Because it is kept in a box.