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Are there any animals that can return to their youth (青年时期)? There is one in the animal kingdom. It is the animal c1. the immortal jellyfish ( 永 生 水 母 ). Do you know a2. about it?
These small animals are just 4 to 5 millimeters ( 毫 米 ) l3.. Their digestive system ( 消 化 系 统 ) l4. like a light. That’s why they’re also called Turritopsis nutricula ( 灯塔水母 ). Scientists f 5.found them in the Mediterranean Sea in 1883, according to National Geographic. When scientists discovered ( 发 现 ) this, they were very s6. and they didn’t know much about it.
When these sea animals get hurt in d7.situations, they can change their cells(细胞) back to their earliest form—in other words, back to youth. The jellyfish’s cells can change into d8.kinds of cells. Muscle cells can become sperm (精子) or eggs, or nerve cells can change into muscle cells. T9., they grow again. Scientists are still wondering h10.this happens. Isn’t that amazing?
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Every living thing on the earth is made up of cells (细胞). Cells grow and make new cells. Most cells are very small and we can’t see them with our eyes. Different cells have different uses. Our skin cells are special ones. The cells on the surface (表面) of our skin are old dead cells. New skin cells are right under the outside. These are the living skin cells. They work for our bodies. They help protect our bodies and heal ( 复原,治愈) cuts.
Our bodies make skin cells all the time. As the old cells fall off, new cells grow in the same place. Each person makes about 18kg of skin cells during his or her life. Surface skin cells fit together closely with no gaps between them. When you cut or burn yourself, you can harm ( 伤 害 ) your skin cells. A small cut will not do much harm. Your skin will quickly heal itself by making new skin cells in just some days. How do skin cells work? First, the cells near the cut get bigger and move into the gap. Next, these bigger cells meet in the middle. They form a new layer (层) of skin cells. Finally, new cells will grow until the gap disappears completely. In this way, your skin can grow and get well itself.
How amazing the tiny cells are! Next time you have a cut, don’t worry about it. Maybe in a few days, you will find it healed.
Introduction | Small cuts in the skin can heal themselves in a1.days. |
Causes | Two kinds of skin2. The cells on the skin are3.and dead. The living cells4.the surface are pretty new, so they work for 5. our bodies. 6.to work Surface skin cells are7.to each other. When they’re cut or burnt, the cells nearby will become 8.and move into the gap. Then they9. in the middle and form new skin cells. At last, new cells will grow until there’s no gap. |
Conclusion | If your skin has a cut, don’t be10.because it will heal itself some days later. |
I will fly kites with my cousin next week. (对划线部分提问)
_____ next week?
Turn left at the third turning. (同义句转换)
_____ on the left.
Cross the bridge and you will find the snack shop on your right. (同义句转换)
_____ the bridge and you will find the snack shop on your right.
These are Millie’s trousers. (对划线部分提问)
_____ are these?
