声声慢

李清照

    寻寻觅觅，冷冷清清，凄凄惨惨戚戚。乍暖还寒时候，最难将息。三杯两盏淡酒，怎敌他、晚来风急！雁过也，正伤心，却是旧时相识。

    满地黄花堆积，憔悴损，如今有谁堪摘？守着窗儿，独自怎生得黑！梧桐更兼细雨，到黄昏、点点滴滴。这次第，怎一个愁字了得！

某商场服装部为了解服装的销售情况，统计了每位营业员在某月的销售额（单位：万元），并根据统计的这组数据，绘制出如下的统计图①和图②．请根据相关信息，解答下列问题．

    Hello! Nice to meet you. Now let me introduce myself (自我介绍) to you. My name is Mary. I'm 12 years old. I'm from Canada and I speak English. I'm a tall girl. I have long brown hair and big blue eyes. I like music a lot. I often sing songs with my friends in my free time. I have a happy family. There are four people in my family. They are my mom, my dad, my sister and me. I like China very much and I want to visit Beijing, but I can't speak Chinese at all.

    I hope (希望) to be your friend, then we can help each other with English and Chinese.

根据材料内容，选择最佳答案。

 天然水中含有的部分杂质如下表所示：

请根据上表内容回答：
（1）写出“主要气体”中两种气体的化学式____ 、____ ；
（2）写出“主要离子”中一种阳离子和一种阴离子的符号____ 、____ ；
（3）写出由“生物生成物”中的离子组成的磷酸二氢铵的化学式____ 。