Scientists have done a lot of r_ on dinosaurs sinse long ago.

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• 英语翻译Dinosaurs lived on the Earth a long,long time ago.Some walk on the land,some flew in the air and some swam in lakes.Some ate meat and some ate plants.Then they all died.Why?Scientists have a lot of ideas.Here are two of them.Maybe the Earth became very cold.Plants all died and water became ice.There was no food or water for dinosaurs and they died,too.Maybe a big rock hit the Earth.Plants and trees died.The dinosaurs died,too.what your idea?
• Scientists have done a lot of r_ on dinosaurs sinse long ago.
• 阅读《螳螂捕蝉》,巧解六“其”
• Have you come up with sone new ideas?