英语：Unit4 Astronomy the science of the stars-reading学案（新人教版必修3）

Unit4 Astronomy:the science of the stars-reading学案

How Life Began on The Earth

学习目标：1. To learn about the origin of life on the earth.

          2. To master the usages of some key language points.

          3. To develop the feeling of treasuring the earth and life.

学习重点：1.Words: ①explode ②multiply ③spread

          2.Expressions:①whether … or not ②in time to do sth ③allow … to do ④in one’s turn ⑤prevent … from

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