Question

英语阅读

Paragraph 4：Even development in architecture has been the result of major technological changes. Materials and methods of construction are integral parts of the design of architecture structures. In earlier times it was necessary to design structural systems suitable for the materials that were available, such as wood, stone, brick. Today technology has progressed to the point where it is possible to invent new building materials to suit the type of structure desired. Enormous changes in materials and techniques of construction within the last few generations have made it possible to enclose space with much greater ease and speed and with a minimum of material. 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.

6. According to paragraph 4, which of the following is true about materials used in the
construction of buildings?
○Because new building materials are hard to find, construction techniques have changed very
little from past generations.
○The availability of suitable building materials no longer limits the types of structures that
may be built.
○The primary building materials that are available today are wood, stone, and brick.
○Architects in earlier times did not have enough building materials to enclose large spaces.
答案为什么是第二个 第三个不对么

Answer 1

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。
不知道我的解说能否被接受

Answer 2

第一个 新的建筑材料在旧时难得到 现在不然 In earlier times。。。而且前后没有因果关系
第二个 Today technology has progressed to the point where it is possible to invent new building materials to suit the type of structure desired 这句话讲的是材料的充足不在限制建筑的结构 所以正确
第三个 答案把范围缩小了 原文such as wood, stone, brick 是诸如此类的材料
第四个 文中没有正面提到