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1、Unit20 Lesson4学习目标By the end of the class, the students will be able to:n Internalizing and externalizing the knowledgen Enhancing scientific knowledge and interest in space explorationn Inspiring and motivating students学习过程课堂活动（一） 预习交流Quick response to the events in the time order.1957_1961_1969_19
2、70_1990_2020_（二） 合作探究Important Elements in Narrative Writing_1. Word Bank: Collection of the relevant vocabulary in the unit, which may help you with your writingWords:Phrases:（三） 分层提高Choose the useful vocabulary and sentences for your outline.Space ExplorationIntroduction:_Write about origins：Write about the present:Write about the future :_Write about the conclusion:_.5. Self evaluation of the writing._ .（四） 总结归纳（五） 巩固反馈Finish the exercise
