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Were trying to save the earth教材分析本单元的中心话题是保护环境，在学习过程中学生注意复习以前的语法及时态，能正确运用现在进行时、现在完成时、被动语态、情态动词和used to 句型。 单 元 教 学 目 标一、知识与技能1、掌握本单元基本词汇：litter, advantage, bottom, fisherman, coal, ugly, cost, wooden, plastic, takeaway, bin, shark, fin, method, cruel, harmful, chain, ecosystem。 2、掌握本单元基本词汇：be harmful to, at the top (of sth.), take part in, turn off Take action, throw away, bring back3、 掌握本单元基本句型： Were trying to save the earth. The river used to be so clean. The air is badly polluted. We should help save the sharks.二、过程与方法采用展示图片，表演对话，创设情境，小组合作与交流，听、说、读、写四项基本技能相结合的方式来学习本单元的知识，培养各项能力。三、情感、态度与价值观有环境危机意识，学会关注环境，保护环境。课时安排Period 1：Section A:1a-1cPeriod 2：Section A:2a-2dPeriod 3：Section A:3a-3cPeriod 5：Section B:1a-1ePeriod 6：Section B:2a-2ePeriod 7：Section B:3a-Self check
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