Though having been told to pay attention to his behavior, he performed bad ____ at the party.

A．manner

B．way

C．politeness

D．manners

碳酸钠基准物使用前应储存在（）。

A.试剂柜中

B.不放干燥剂的干燥器中

C.浓硫酸的干燥器中

D.放有硅胶的干燥器中