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教师通过展示实物、直观教具进行示范试验，指导学生获取知识的方法是（）。
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案例分析题小班科学活动：叮叮当【活动目标】1．感知日常生活中各种不同的声音，尝试分辨一些不同的声音。2．指导耳朵能听声音，要保护好耳朵。【活动准备】1．每人一个小动物头饰。2．空铁罐每人一个，石块、沙子、米粒或者黄豆、树枝若干。3．铃一个。 根据所提供的活动目标和活动准备材料，设计小班科学教育活动“叮叮当”，要求写明活动过程。
We all know there exists great void（空白）in the public educational system when it comes to（26）to STEM（Science,Technology,Engineering Mathematics）,One educator named Dori Roberts decided to do something to change this system. Dori taught high school engineering for 11 years.She noticed there was a real void in quality stem education at all（27）of the public educational system. she said,“I started Engineering for kids (EFK)after noticing a real lack of math, science and engineering programs to（28）my own kids in”She decided to start an after school program where children（29）in STEM-based competitions.The club grew quickly and when it reached 180 members and the kids in the program won several state（30）.she decided to devote all her time to cultivating and（31）it The global business EFK was born.Dori began operating EFK out of her Virginia home, which she then expanded to（32）recreation centers. Today, the EFK program（33）over 144 branches in 32 states within the United States and in 21 countries. Sales have doubled from $5 million in 2014 to $10 million in 2015,with 25 new branches planned for 2016. the EFK website states, “Our nation is not（34）enough engineers. Our philosophy is to inspire kids at a young age to understand that engineering is a great（35）.” 31（）
我国幼儿教师的义务有（）。
技能性的特点是学前儿童音乐教育区别于其他学科教育的明显特征之一。
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