---Do you know the danger caused by smoking?

---Yes, too many cigarettes can lead to_______ lung cancer.

A．a person suffers from

B．a person to suffer from

C．a person being suffered from

D．a person suffering from

军用列车发生脱轨，造成军事物资损坏不能使用，属于（）军运事故。

A、一般

B、险性

C、一级

D、二级