people是个集合概念名词,也就是说它表示一个整体,即一群人,所以应用too many people ；提问有多少人是时应用问句为How many people are there in your ...
How much修饰不可数名词 How much rice do you have?米,不可数
How many修饰可数名词 How many apples do you have?苹果,可数
How much还有个用法是是问价格 How much is the hat?那顶帽子多少钱?