阅读短文，下列问题

 B

The wolves(狼) are very hungry. They go out to look for food. There are many sheep near the hill. There are also a few sheepdogs with them. The wolves think of an idea. They speak to the sheepdogs, “You are like us and we are brothers. But we have a very different life. We do what we like, and you must work for men. They make you look after their sheep. They eat meat and give you the bones(骨头). If you listen to us and give us the sheep, we can eat them together. All of us will be happy, right?” The dogs are happy and do like this. The wolves ask the dogs to go to their house. The sheepdogs go to the wolves’ home. But the wolves eat them and then eat the sheep.

 A﹣H是初中化学常见的物质，其相互转化关系如图所示，其中A是人体胃液中帮助消化的物质，B用于改良酸性土壤．

（1）D的化学式为____ ．

（2）A转化为E的化学方程式为　____ ，其反应基本类型属于____；B转化为H的化学方程式为____ ．

（3）分别写出物质F和H的一种用途____；____．

一位同学说：“升入初三，妈妈为督促我学习，不顾自己上班路途遥远，在学校附近租房陪读。每次考试后她都要追问我的排名，使我很烦，一考试就十分紧张。”我们可以建议该同学（   ）
①增强实力，提高自信               ②克服过度的考试焦虑
③主动与父母沟通                       ④体会父母为自己付出的辛劳