①每个人要对自己的行为负责

②法律维护公平正义，保障人民生命安全

③要合法经营，诚实劳动致富，关爱他人生命

④行为与后果之间没有必然联系

阅读下面文段回答问题。

        I'm Mrs Zhou. I'm a teacher in No. 1 Middle School(第一中学). This is Li Lei. He's Chinese. He is in Class 2, Grade 7. He's my student, and my son(儿子)too. He's twelve.

       That girl is Jean. She's American. She's eleven. And that boy is Jack. He's English. He's ten. They're in Li Lei's class.

I'm their Chinese teacher. All the students and the teachers have two names: an English name and a Chinese name. Li Lei's English name is Tom. My English name is Mary. Their English teacher Miss Jin's English name is Sue. Jean's and Jack's Chinese names are Wei Hua and Zhang Li.

方程组$\left\{\begin{array}{c}x-5y=2\\ 2x+3y=9\end{array}\right.$的解为____ ．

 甲、乙、丙、丁是初中化学常见的物质，常温下，它们具有如图所示关系．“﹣”表示连接的两种物质能反应，“→”表示物质转化的方向，下列推断错误的是（　　）