—_______.
A:Not at all
B:You should go to a doctor
C:I'm sorry
D:You shouldn't tell it to your mother
小军同学为确定实验室某一失去标签的液体物质,设计如下探究实验方案,其中你认为错误的是( )
引发图中所示人口流动的最主要的因素是( )