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四年级下册预习《3 天窗》（一）
完成五个学习任务：标自然段、生字词、多音字、读通课文、完成课后第一题
四年级下册课文讲解6/16
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完成五个学习任务：标自然段、生字词、多音字、读通课文、完成课后第一题
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