-----Do you know whether they talked about their work or their family?

-----As      matter of fact，I couldn’t hear it clearly, as they talked in        whisper．

A．the，a

B．the，the

C．a；a

D．a：/

导体的电阻是导体自身的一种物理属性，导体电阻的大小与导体的______、______有关；此外还和温度有关．用滑动变阻器来改变电路中的电流大小，是通过改变其接入电路电阻丝的______来实现的．