Dinosaurs lived on Earth more than 60 million years before human beings.Thay lived everywhere on Earth.Some dinosaurs were as small as chickens.Others were as big as ten elephants.Some could even fly.

问题描述:

Dinosaurs lived on Earth more than 60 million years before human beings.Thay lived everywhere on Earth.Some dinosaurs were as small as chickens.Others were as big as ten elephants.Some could even fly.