谁有高中英语必修二unit4的一篇课文,animal extinction,给个文档文件,

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/19 17:02:34

Many animals have disappeared during the long history of the earth.The most famous of these animals are dinosaurs.They lived on the earth tens of millions of years ago,long before humans came into being and their future seemed secure at that time.Dinosaurs died out suddenly about 65 million years ago .Some scientists think it came after an unexpected incident when a huge rock from space hit the earth and put too much dust into the air.Others think the earth got too hot for the dinosaurs to live on any more.Nobody knows for sure why and how dinosaurs disappeared from the earth in such a short time .
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