Revert "test 3"

This reverts commit 91c8c9e1c883fd1cec4c9146344defb8cc143cd4.

Conflicts:
	9.kvc、kvo、谓词与通知/kvc作业/PersonKVC/main.m
Revert "test1"

This reverts commit 91c8c9e1c883fd1cec4c9146344defb8cc143cd4.

Conflicts:
	9.kvc、kvo、谓词与通知/kvc作业/PersonKVC/main.m