What the remote areas need ____ education to children  and what the children need ____ good

textbooks and  teachers at the moment.   [ ]

A. is; are          

B. are;  is      

C. was;  were

D. were; was

安全旧标的措施体系是安全昏际实现的（）。

A.目的

B.原则

C.前提

D.保证