—What about _____ English-Chinese dictionary on the bookshelf?—In my opinion, it's _____ useful tool book for my English learning.
A:a; an
B:an; a
C:the; a
D:the; an
汉代谚语有云:“一夫不耕或受之饥,一妇不织或受之寒。”与该谚语所反映的生产模式不相符的是( )
It is important us each other?
若a<b<c,则函数fx=x-ax-b+x-bx-c+x-cx-a的两个零点分别位于( )