一道完形试题,对答案十分不理解,

题目

一道完形试题,对答案十分不理解,
The world of the our-of-doors is full of secrets.There are so many secrets,and they are so interesting hat thousands of men and women,boys and girls are busy studying them.All around us are birds,animals,trees and flowers.The fact about how they live and grow are interesting as ___ could be.
.
A.nothing B.something C.anything D.everything
答案是C但我觉得是A——没有什么可以和它一样有趣,不是nothing吗?

答案

不是没有什么,而是没有任何什么