今天的科学活动是“各种各样的轮子”。活动前，我为幼儿准备了材料各异、形状不一的车轮，却为材料的提供方式犯了愁：如果按以往的提供方式把材料按组分发到桌上，不仅费时，而且材料占了大半张桌子，孩子们怎么能放开手脚操作呢？于是，我便设想开辟一个“材料超市”，... Today’s science activity is “a variety of wheels.” Before the event, I prepared different shapes and different wheels for young children, but they were worried about the way in which the materials were provided: if the materials were distributed on the table according to the methods provided in the past, it was not only time-consuming but also materials Most of the tables, children how to let go of hands and feet operation? So, I would like to open up a “material supermarket”, ...