钢材的拉伸试验属于：（）。

A.无损检测

B.高倍检验

C.硬度检验

D.破坏性检验

-What’s the matter with John? He has been sitting there for hours.

-A postcard from his father   an attack of home-sickness in him.

A．took up

B．set off

C．brought in

D．built up