根据能量转移理论的概念，事故的本质是什么？
A.能量的不正常作用
B.造成人员死伤
C.造成经济损失
参考答案：A
---Would you like me to help you with the homework?
---______________ . But I can manage it myself.
A．It doesn’t matter
B．The same to you
C．It’s very kind of you.
D．Take it easy
试述我国烟叶质量的现状与提高烟叶质量的关键栽培技术。
