The article written by the famous economist is really _______. None of us can understand it.
A:attractive
B:accessible
C:abstract
D:absolute
①两点确定一条直线;
②延长直线AB到C;
③延长线段AB到C,使得AC=BC;
④反向延长线段BC到D,使BD=BC;
⑤线段AB与线段BA表示同一条线段;
⑥线段AB是直线AB的一部分.
照样子,写词语。
①不慌不忙
____ ____ ____
②好好学习