题目内容：
根据提供的信息和语言素材设计教学方案，用英文作答。设计任务：请阅读下面学生信息和语言素材，设计一节英语读写课的教学方案。教案没
有固定格式，但须包含下列要点：
•teaching objectives
•teaching contents
• key and difficult points
•major steps and time allocation
• activities and justifications
教学时间：45分钟
学生概况：某城镇普通中学八年级(初中二年级)学生，班级人数40人，多数已经达到《义务教育英语课程标准(2011版)》三级水平，学生课堂参与积极性一般。
语言素材：
Dinosaurs
Dinosaurs lived on the Earth over sixty million years ago. This was a long time before people existed. Dinosaurs lived everywhere. Some were as small as chickens. Others were as big as ten elephants. Some dinosaurs even had wings and could fly.
Many dinosaurs were harmless．They were as gentle as sheep and ate plants．Others were harmful．They were fiercer than tigers and ate meat．
Dinosaurs all died out suddenly．Nobody knows why．We know about the lives of dinosaurs
from the skeletons，eggs and footprints they left behind．
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答案解析：