—What seems to be the problem?

—____

—How long have you been like this?

—Since Saturday night.

—____ 

—Yes, I also feel lighthearted.

—Can you think of anything you ate Saturday that might have caused it?

—All I can think of is the fish I had. It didn't taste quite right.

—____  Now I'll give you some medicine. Take it and you should be feeling better soon.

—____

—I also suggest that you follow a special diet.

—____ 
—You should stick to eating lighter foods.

A:What's that?

B:That might be it.

C:Thank you, doctor.

D:Any other problems?

E:I have a running nose.

F:Have you seen a doctor?

G:I have a terrible stomachache.

请用正楷字将下面的语句准确、规范、美观地抄写在田字格里。

为心中的理想而奋斗。

2015年6月，中国南车与中国北车完成双方合并的换股实施工作。回答下面问题。

 已知A～G为初中化学常见的物质．

如图所示“→”表示转化关系，“﹣”表示相互能发生反应．已知A是人体胃液中含有的酸，E是最轻的气体，B和D所含元素相同．

请回答：

（1）写出下列物质的化学式：A____ ，D____ ．

（2）G物质的一种用途____ ．

（3）写出F→E的化学反应方程式____ ，该反应的基本类型为____ 反应．