If there are much more people in the world,there must be more food to feed people.为什么这道改错题

many more + 复数名词
much more + 不可数名词 或者 多音节形容词
修饰比较级的并不一定是much, 可以使别的程度副词,甚至可以使具体的量
I am three years older than you. 这里的three years 就是 年长的程度.
希望对你有用,望采纳!