__________ after a whole day’s work that he could hardly stand it.

A．So he was tired and hungry

B．Was he so tired and hungry

C．So tired and hungry was he

D．So tired and hungry he was

使用分液漏斗时，应首先[ ]

A．洗涤        

B．检查是否漏水

C．打开上端塞子 

D．打开活塞