水平桌面上的圆台形容器中盛有适量的水，将一个重力是0.5 N 的小球放入容器中，水未溢出，小球处于漂浮状态，如图所示，   则放入小球后

A．水对容器底部的压强变大

B．对桌面增大的压力等于0.5 N

C．水对容器底部的压力变化小于0.5 N  

D．水对容器底部的压力变化大于0.5 N

After he gave a report about the school, Mr White____ the visitors around it.

A．went on to show

B．went on showing

C．went on with showing

D．kept on showing