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Significantly, the use of exposed iron occurred mainly in the new building types spawned by the Industrial Revolution: in factories, warehouses, commercial offices, exhibition halls, and railroad stations, where its practical advantages far outweighed its lack of status. Designers of the railroad stations of the new age explored the potential of iron, covering huge areas with spans that surpassed the great vauits of medieval churches and cathedrals. Paxton's Crystal Palace, designed to house the Great Exhibition of 1851, covered an area of 1848 feet by 408 feet in prefabricated units of glass set in iron frames. The Paris Exhibition of 1889 included both the widest span and the greatest height achieved so far with the Halle does Machines, spanning 362 feet, and the Eiffel Tower 1,000 feet high. However, these achievements were mocked by the artistic elite of Paris as expensive and ugly follies. Iron, despite its structural advantages, had little aesthetic status. The use of an exposed iron structure in the more traditional styles of architecture was slower to develop.
11.What does the passage mainly discuss?
(A) Advances in iron processing in the eighteenth and nineteenth centuries
(B) The effects of t he Industrial Revolution on traditional architectural styles
(C) Advantages of stone and timber over steel as a building material
(D) The evolution of the use of iron in architecture during the 1800's
12.The word "revolutionized" in line 1 is closest in meaning to
(A) quickly started
(B) gradually opened
(C) dramatically changed
(D) carefully examined
13.According to the passage, iron was NOT used for beams, columns, and girders prior to the early eighteenth century because
(A) all available iron was needed for other purposes
(B) limited mining capability made iron too expensive
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