— I am late,for there is too much traffic on my way to school.

— Oh,      . Don't lie![      ]

A. take your time

B. don't worry  

C. come on

D. take it easy

在薄板冲裁模具中，上、下模板一般采用哪种材料（）

A.铸铁

B.合金铸铁

C.钢板

D.铝