After school we went to the reading-room to do some reading, only to be told that it _____.

A．was decorated

B．had decorated

C．had been decorating

D．was being decorated

火灾现场的勘验步骤应遵循的原则中不正确的是（）。

A、先静观后动手

B、先外表后内部

C、先照相后提取

D、先一般后重点