Millions of years ago, dinosaurs (恐龙) controlled the earth. And there were different types of dinosaurs on the earth. Some of them were no bigger than chickens, but all of them had very small brains (大脑). Later on, there weren’t any dinosaurs. What happened to them?
In the days of dinosaurs, the whole earth was warm and wet. There were many green forests. But the earth changed slowly all the time. When parts of the earth became cold and dry, the forests there died. Then dinosaurs could not find enough food to eat. This must be one reason why dinosaurs died out.
What’s another reason? We can make a guess. New kinds of animals came to the earth. Some had big brains and were fast and strong. They could kill dinosaurs. Some ate dinosaur eggs, too.
There may be other reasons that we do not know about. Each year, people will find some dinosaur footprints (脚印) and bones. Scientists are trying to tell us more about dinosaurs.
【小题1】Dinosaurs controlled the earth ________.
| A．when all the forests died out | B．when the earth was warm and wet |
| C．when the earth was snowy | D．when parts of the earth became cold |
【小题2】The underlined word “dry” means ________ in Chinese.
【小题3】According to the passage, we are NOT sure that ________.
| A．all dinosaurs had very small brains |
| B．different types of dinosaurs were on the earth |
| C．millions of years ago dinosaurs controlled the earth |
| D．new kinds of animals came to the earth and killed dinosaurs |
【小题4】We can learn ________ from this passage.
| A．dinosaurs are not strong | B．dinosaurs left nothing on the earth |
| C．scientists are trying to study dinosaurs | D．scientists know everything about dinosaurs |
【小题5】Which can be the best title for the passage?
| A．Why Dinosaurs Died Out | B．Where Dinosaurs Lived |
| C．When Dinosaurs Died Out | D．What Dinosaurs Looked Like |
