菜鸟有问题，求解prep的一道题

amyyueyue

直接上问题~~~
prep语法笔记里的第二题
划线的句子是for monitoring of population changes of as many as, or of ......
正确的选项是to monitor changes in the population of ,不知道各位大大是不是记得
of as many as or of more than 到底是什么结构，什么意思？
谢谢了