A boy and a girl were playing together. The boy had a lot of small glass 1. The girl had some candies with her. The boy told the girl that he would2her all his balls in exchange for (交换) her candies. The girl thought that was a good3.

    But the boy didn't give4of his balls to the girl. He kept the biggest and the5ball in his pocket and gave the others to the girl. 6the girl gave him all her candies.

    That night, the girl had a 7sleep, but the boy didn't sleep well. He kept thinking whether the girl had 8some candies from him.

    You think in the way you do things. If you don' t give your hundred percent(百分之百) in a relationship, you'll 9 keep thinking if the other person has given his or her hundred percent. This is true for any relationship.

    Give your hundred percent to everything you do and you'll find that you can always10a lot of happiness.

已知抛物线的顶点坐标为M（1，-2），且经过点N（2，3），求此二次函数的解析式．

甲、乙两个不透明的布袋，甲袋中装有3个完全相同的小球，分别标有数字0，1，2；乙袋中装有3个完全相同的小球，分别标有数字﹣2，﹣1，0；从甲袋中随机抽取一个小球，再从乙袋中随机抽取一个小球，两球数字之和为1的概率是（　　）

某环保小组为探究“废旧电池对水质的影响及防治”，开展了以下研究活动．

（一）查阅资料

资料一：废旧电池丢弃到自然界腐烂后，因含汞、铅、铜等有害物质造成水质污染．

资料二：满江红为常见的水生旋类植物，在美化水体景观、净化水质、保持河道生态平衡方面有显著功效．

（二）设计实验方案及数据统计（见表）

结合上述有关内容，请完善下列探究活动：