题目

What I Want for You and Every Child in America Dear Malia and Sasha,     I know that you've both had a lot of  1  these last two years on the campaign trail, going to picnics and parades and state fairs, eating all sorts of junk food your mother and I probably shouldn't have let you have．But I also know that it hasn't always been easy for you and Mom, and that as excited as you both are about that new puppy（小狗）, it doesn't  2  for all the time we've been apart．I know  3  I've missed these past two years, and today I want to tell you a little more about why I decided to tak某化工厂排出的废液中含有AgNO3、Cu（NO3）2和Zn（NO3）2．为了减少废液对环境的污染，并回收银和铜，某化学小组同学设计了如图所示方案进行实验：试回答：（1）加入的固体a是（写化学式）________．（2）固体乙的成分有________（3）步骤①中将滤液1与固体甲分离的操作名称是________（4）写出步骤②中发生反应的化学方程式________．