common core truth:

Common Core replaces the traditional foundations of Euclidean geometry with an experimental approach. This approach has never been successfully used in any sizable system; in fact, it failed even in the school for gifted and talented students in Moscow, where it was originally invented. Yet Common Core effectively imposes this experimental approach on the entire country, without any piloting.

所有跟帖： 

• 每次改革都越来越差。以牺牲一代人为代价。 -CirrusCloud- ♀ (6 bytes) () 07/26/2015 postreply 08:07:26