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| Mammals(1) | |
| 摘 要： | What is a mammal? Mammals are warm-blooded animals that have a backbone.Mam- mals are the only animals that feed their babies with mother's milk. All mammals are warm-blooded.That means they keep the same body temperature all the time.Keeping warm uses up a lot of energy,so mammals need more food than cold-blooded animals such as reptiles. |
Mammals(1) |
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