---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

下列由叶支气管至小支气管的结构变化，错误的是（）。

A.管径变小

B.管壁变薄

C.杯状细胞、腺体和软骨减少或消失

D.上皮由假复层纤毛柱状变成单层纤毛柱状

E.平滑肌纤维增多