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

《仪器和观测方法指南6版》：测站的坐标是（）.

A.纬度，准确到分

B.经度，准确到分

C.测站位于平均海平面以上的高度。即测站的海拔高度，精确到米。