6.4.7.1 read the text and answer the questions.1 why couldn't people build really tall buildings in the past? 2 when could people start building skyscrapers? 3 how did the invention of the elevator change the history of buildings? 4 why did people want to build skyscrapers in cities? 5 why are tall buildings called 'skyscrapers'? 6 how fast did the empire state building grow? 7 what can you find in the triumph of astana in kazakhstan?

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