施工单位应按有关规定定期对计量设备进行检查、检定，确保计量设备的（）。

A.优越性和技术性

B.优越性和可靠性

C.精确性和可靠性

D.精确性和经济性

______ for a long time, most of the crops in this area died from lacking water.

A．Being no rain

B．There was no rain

C．To be no rain

D．There being no rain