There are many mysteries about dinosaurs to which we long to find explanations. You may think that dinosaurs were big, green and scaly, right? In fact, it seems that they appeared very different from 【小题1】 (think).

In recent years, scientists have worked out 【小题2】 (look): many of them were small with feathers. However, 【小题3】 (have)feathers still isn’t clear-it might have been for communicating or for staying warm, but not just for flight.

Scientists also believe that many dinosaurs had bright colours. It seems 【小题4】 (depend on)their habitats. That is, dinosaurs which could fly would have had different colours to those living in the sea.