As long as we persist in spreading scientific knowledge among the masses，all the strange beliefs

are __________ to go out of our life.[ ]

A．necessary  

B．important

C．difficult  

D．bound

为了在有限的篇幅内深入浅出、透彻明白地阐述问题，广播评论在写作上应（）

A.力求“省文”

B.善于“省意”

C.善于“稀释”

D.重视“引经据典”

E.适当“还原”