20世纪后半叶，以电视为先导的现代传播媒介重组了人类的生活空间。世界被家庭化，人被世界化，人和世界的关系被重新定义。电视作为人耳和眼的延伸，每天都以大量的交叠组合的镜头把整个世界呈现在咫尺荧屏之中，呈现在你的眼前。身处当代文明中的人类，越来越依靠传播媒介来构筑自己的世界图景。对媒介自身来说，这既是一种光荣，也是一种十分沉重的责任。

A．home training is more important than school training because a child spends so many hours with his parents
B．teachers can and should help parents to understand and further the objectives of the school
C．parents unwittingly have hindered and thwarted curricular objectives
D．there are many ways in which the mathematics program can be implemented at home