Unit4 Astronomy:the science of the stars-reading学案

a visit to the moon学习目标：1. learn about the three ways gravity changed during the visit.          2. master some key language points.          3. develop the curiosity of exploring space.学习重点：1. words: ① force/power/strength/energy ② escape ③ exhaust          2. phrases: get the hang of          3. 倍数的表达学习方法：自主探究；小组合作学习过程：ⅰ. knowledge link who is the first manin china walking in space?                            ⅱ.reading1.