读下图回答:
(1)法国有一条重要的马奇诺防线,工事坚固,法国派有重兵把守,但很快失去了作用。马奇诺防线是怎样失去作用的?
___________________________________________________________________________________________
(2)概述图中反映的法国政局。
___________________________________________________________________________________________
(3)分析形成这种政局的原因及从中吸取的教训。
___________________________________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________
___________________________________________________________________________________________