— Stay a bit longer, please. It's been such _____ fun having you here.

— Thank you, but I've got _____ early start tomorrow morning. [ ]

A. /; the

B. a; an

C. /;an

D. the; an

在按回路正常工作电流选择3～35kV裸导体截面时，导体的长期允许载流量应按所在地区的海拔高度及( )进行修正。

A．环境风力

B．环境湿度

C．环境温度

D．环境通风