My friend Alex is        handsome boy,        boy everyone likes to work with.[ ]

A. a; a    

B. a; the        

C. the; a        

D. the; the

在对避雷器进行工频耐压试验时，为了避免放电时烧损火花间隙，应限制通过火花间隙的电流不大于0.5A。