Structure in Design of Architecture And Structural Material文

development in architecture has been the result of major technological changes.接着说in earlier times~today~.还有：目前在建筑材料和设计方面的变化 已经能够用有限的材料去设计更好更多种类的~.最后一句：Progress in this area can be measured by the difference in weight between buildings built now and those of comparable size built one hundred ago.,
选项里 说合适的材料不再成为建筑类型的限制,说明想表达的意思是现今的材料能够设计出更多种类的作品,重要说的是availability of suitable building materials 和 types of structures 之间的关系.
不知道我的解说能否被接受
自己打的,蛮辛苦,
百度搜索:麦拍拍