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阅读文章要点：saber-toothed cat是群居动物
1. Fossils of saber-toothed cats with broken bones indicate that they were fed by other saber-toothed cats when they were injured.
2. There are large numbers of saber-toothed cats in the trap. The saber-toothed cats hunted together. The sound of dears in the trap attracted them to fall in the trap together.
3. Saber-toothed cats lived with other predators such as lions and wolves. Saber-toothed cats have to live in group to #pete with those predators.
听力逐一反驳：
1. The fossils of saber-toothed cats with broken bones indeed indicate that they could survive when they were injured. However it doesn’t necessarily mean that they have to be fed by other saber-toothed cats. Many predators can find dead animals to eat. So did the saber-toothed cats.
2. The large numbers of saber-toothed cats in the trap doesn’t mean that they hunt together. The saber-toothed cats hunted separately. One of the saber-toothed cats heard the sound of the trapped dear, went to the trap and fell. Then another saber-toothed cat also heard the sound of the trapped dear, came to the trap and fell again.
3. Saber-toothed cats were large predators. Take tigers for example, one tiger is strong enough to fight against the social predators such as lions and wolves. So the saber-toothed cats don’t have to live together to #pete with lions and wolves. | 
