【正文】
Dinosaur (恐龍 ) lived on the Earth long long ago. There were many kinds of dinosaurs. They were ever the host of the Earth. But suddenly they all died one day. About the death of them there are a lot of thoughts. Some scientists think they were died of short of food. Some think they died because of the hot or cold weather. But I think they died because they killed each other. They were killed by themselves. But no one know the real reason. So I want to know your idea. Can you tell me what you think they all died of? 1. The dinosaur live on the Earth recently(最近) ( ) 2. There is only one reason for the death of the dinosaur. ( ) 3. No one really knows the reason for the death of the dinosaur. ( ) 4. There were m