I have had my bike _______ , and I'm going to have somebody _______ my radio    tomorrow．

A．repair; to repair

B．repairing; to be repaired

C．repaired; repair

D．to repair; repairing

以节能灯代替白炽灯，可节省高达（）的电力。如果全国使用12亿支节能灯，一年节约的电量相当于目前三峡水电站年发电量的1.7倍。

A.20%至30%

B.70%至80%

C.80%至90%