I hate it because it's an obligation disguised as an option.
2016年12月四级真题（第一套）阅读 Section C
柯林斯高阶英汉双解学习词典释义
N-VAR
假装;装扮;伪装
If you are in disguise, you are not wearing your usual clothes or you have altered your appearance in other ways, so that people will not recognize you.
If you disguise yourself, you put on clothes which make you look like someone else or alter your appearance in other ways, so that people will not recognize you.