American architecture is at its best when it is concerned with buildings that have a practical purpose. Factories, office buildi

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问题     American architecture is at its best when it is concerned with buildings that have a practical purpose. Factories, office buildings, public buildings, rail terminals and airports, and other such【C1】______show American architecture at its【C2】______imaginative and graceful, as well as its most【C3】______. The single most important American【C4】______design that makes most use of the limited land is the skyscraper, a style【C5】______in the late nineteenth century and since then known【C6】______the trademark of American buildings.【C7】______the development of the steel skeleton frame for buildings , the weight and low strength of stone and brick limited me【C8】______of me city office building【C9】______about twelve floors.【C10】______American cities grew larger in the closing years of the nineteenth century, the【C11】______on which the structures might be placed became more valuable, me demand for【C12】______buildings increased. The use of【C13】______frame for construction was a direct response【C14】______tins demand.
    The first office building to use me steel frame【C15】______was constructed in 1884. It soon became clear【C16】______a steel-frame building could【C17】______at least four times as high as【C18】______of brick and stone. In【C19】______more man ten years, the use of steel has revolutionized the design of city office buildings, and me【C20】______was born.
【C6】

选项 A、about
B、to
C、as
D、of

答案C

解析 sth.known as sth.“某物被认为是什么”。
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