It is difficult to the point of impossibility for the average reader under the age of forty to
问题描述：
It is difficult to the point of impossibility for the average reader under the age of forty to
imagine a time when high-quality arts criticism could be found in most significant collection of critism could be found in most big-city newspaper
答
对于40岁以下的普通读者而言,他们很难甚至无法想象一个曾经能在大多数大城市报纸上读到高品质艺术评论的时代.
复合句.句子主干为 It is difficult...to imagine a time.it 作形式主语,真正的主语是不定式短语 to imagine a time.其中 when 引导定语从句修饰 time.介词结构 for the average reader under the age of forty 作状语.
to the point of “达到...的程度；切中要害”,本句中是“达到...程度”的意思.