单项选择题

What does the passage mainly discuss

A．Advances in iron processing in the eighteenth and nineteenth centuries.
B．The effects of the Industrial Revolution on traditional architectural styles.
C．Advantages of stone and timber over steel as building materials.
D．The evolution of the use of iron in architecture.
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单项选择题
It can be inferred that the delayed use of exposed iron structures in traditional styles of architecture is best explained by ______.
A．the impracticality of using iron for small, noncommercial buildings
B．the association of iron architecture with the problems of the Industrial Revolution
C．the general belief that iron offered less resistance to fire and harsh weather than traditional materials
D．the general perception that iron structures were not beautiful in appearance
单项选择题
Iron replaced stone and timber in the building of bridges because iron was considered ______.
A．more beautiful
B．new and modern
C．much stronger
D．easier to transport
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