教学内容
学习目标:
1．知识与能力：To grasp the main idea of the passage by making use of some reading skills
2.过程与方法：To grasp the main idea by self-directed learning ,discussion ,cooperation
3.情感态度价值观: To know the importance of protecting the earth and environment
学习重点: To learn more knowledge about how life began on the earth
学习难点: To le arn more knowledge about how life began on the earth
【学案使用说明】请充分预习课文，结合词典及课后单词表完成此学案。
