【多选题】【消耗次数：1】
科学活动中的材料应如何投放（ ）。
①
材料的投放要有明确的主题并且紧扣具体活动目标。
②
投放材料难度形成一定的层次。
③
投放材料的开放性。
④
同种材料与多种材料的灵活运用。
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【简答题】
简述各年龄段结构游戏材料投放的特点。
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