I suppose by the time I come back in ten years' time all these old houses_______down.

A．will be pulling

B．will have been pulled

C．will have pulled

D．will be pulled

穿过一个单匝线圈的磁通量始终为每秒均匀的这增加2Wb，则[ ]

A.线圈中的感应电动势每秒增加2V

B.线圈中的感应电动势每秒减小2V

C.线圈中的感应电动势始终为2V

D.线圈中不产生感应电动势