①具有选择、创造文化的特定功能
②是文化交流与传播的重要途径
③具有文化传递、沟通和共享的功能
④使教育手段和方式发生了重大变革
A:①②
B:③④
C:②④
D:①③
理一理,分一分
已知圆中一段弧长正好等于该圆的外切正三角形的边长,那么这段弧所对的圆心角的弧度数为 ( )
We need two students____ (clean)the classroom.
They need help at the old ____ (people)home
Do you make any ____ (friend)here?
Mr.Wang teaches ____(they)math.
Sally is busy ____ (do)her homework.