Kate isn't happy because she lost her pet. Let's go to cheer her up.
A:look her up
B:make her happy
C:set her up
下列人类活动不会破坏生态系统稳定性的是( )
“学会做人,学会辨别是非善恶,比学习专门知识显得更为重要,一个“德盲”远比一个“文盲”对社会更具负面效应。”这段话体现了( )
52-30=____