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英語八年級下翼教版 Unit 8 Save our worldLesson 61教案 Teaching aims: Aim of knowledge: Master the usage of new vocabularies for describing materials and for paring quantities. Aim of ability: Improve students’ reading and speaking ability Aim of emotion: cultivate students to get into a good habit of collecting and sorting garbage. Train students to play an active role in environment protection. Difficult Points: learn the new vocabularies for describing mate rial and for paring q uantities according to k