It rained that day and ________ the basketball game was called off.   [ ]

A. however          

B. still  

C. though            

D. consequently

机房内通信设备及其供电设备正常不带电的金属部分，进机房电缆的保安装置接地端，以及电缆的金属护套均应作（）.

A.通信回路接地

B.保护接地

C.中性点接地

D.防雷接地