---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

感生电流产生的磁通总是（）原磁通的变化。

A、阻碍

B、制止

C、增加

D、促进