In        distance is a tall tree which is said to have      history of over 500 year. [ ]

A. the; /        

B. /; /          

C. the; a        

D. a; a

在车身的各种焊接过程中都会用电能，救助触电者脱开带电体应采用的方法是（）

A、用绝缘物拨开

B、直接用手拉开

C、用铲车推开

D、用链子锁拖开