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1. Answer the following questions.

1. What kind of buildings do we call special structures?

2. Can the purpose of a special structure be recognized from its design?

3. What material are special structures usually built of?

4. What helps architects to improve the acoustics in concert halls and theatres?

5. Why is the view of the theatre stage much better now than it used to be?

6. What were the most imposing architectural structures in the past and by what have they been replaced nowadays?