A：氯化铁溶液与铜反应：Fe3++Cu═Fe2++Cu2+
B：硅酸钠与稀硫酸反应：Na2SiO3+2H+═2Na++H2SiO3↓
C：氯气与水反应：Cl2+H2O═2H++Cl﹣+ClO﹣
D：氢氧化镁与稀盐酸反应：Mg（OH）2+2H+═Mg2++2H2O
阅读理解。
Aunt Judy's birthday is coming. She will be 38 years old. Dad and Mum are going to take me to her house. She lives in Guangzhou. We are going to go there by train. Her birthday party will be on Saturday. We are leaving on Friday afternoon. And we are coming back on Sunday evening. I am going to give my dear Aunt Judy a picture . I am drawing it now. I am drawing some beautiful flowers. I am drawing a small dog, too. That's because she likes dogs. The picture will be very nice.
在10﹣9﹣10﹣7m范围内，对原子、分子进行操作的纳米超分子技术往往能实现意想不到的变化．如纳米铜颗粒一遇到空气就会剧烈燃烧，甚至发生爆炸．下列说法中正确的是（ ）
