A:addicted to; rid yourself of it
B:used to; rid yourself of it
C:accustomed to; be got rid of it
D:addicted to; get away with it
孔子成为名家之后,仍然谦恭好学。他曾拜老聃为师学过礼教,拜苌弘为师学过乐理,年届花甲还拜师襄为师学习弹琴。下列表述正确的是( )
下列各式中,不是二次根式的是( )