Those societies came out of the war with levels of enrollment that had been roughly constant at 3-5% of the relevant age groups during the decades before the war.
《义务教育数学课程标准(2011年版)》提出了“四基”包括基础知识、基本技能、基本思想、基本活动经验。请结合教学实际谈谈如何积累学生的数学活动经验。
Those societies came out of the war with levels of enrollment that had been roughly constant at 3-5% of the relevant age groups during the decades before the war.
材料:某幼儿园在结构区进行了分步骤的材料投放,开始投放一些大型积塑让幼儿拼插、搭建,然后投放一些木板、海绵块,暗示幼儿混合使用材料,过一段时间后,又投放一些纸盒、易拉罐等,鼓励幼儿综合运用多种材料,搭建有主题内容的物体。
问题:请从幼儿园环境创设的角度评价一下幼儿园材料投放。