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.
逻辑：In earlier times design structural systems suitable for the materials that were available,. Today invent new building materials to suit the type of structure desired.
过去是为了配合可用材料而设计结构，现在是发明新材料配合想要的结构。
- According to paragraph 4, which of the following is true about materials used in the construction of buildings?
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A. Because new building materials are hard to find, construction techniques have changed very little from past generations.------错，不是难找，是好找
B. The availability of suitable building materials no longer limits the types of structures that may be built.
C. The primary building materials that are available today are wood, stone, and brick.---错误，不是today，而是以前
D. Architects in earlier times did not have enough building materials to enclose large spaces.--------错，没提及enclose