英语阅读Paragraph 4:Even development in architecture has been th
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短文里更强调的是 现在和过去之相比较.文章开头: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.

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