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giúp mik bài đọc vs ạ People have defined ‘skyscraper’ in a number of ways over the years: an ornament on the top of a building, a high-flying bird, a very tall man and a sail at the top of a mast.At the end of the nineteenth century, the word was used to refer to buildings of ten storeys or more.Later, a lift was used to take people up to the higher floors, as in the most famous skyscraper, the Empire State Building.During the middle ages, the people living in the cities of northern Europe began to build great cathedrals.Tall spires were added to make these churches higher and bring them closer to heaven. In the nineteenth century, as cities grew more crowded with people looking for work, the value of land rocketed.New businesses were starting and in order to make room for offices on a small plot of land, it was necessary to build higher.But the problem was that to put up a stone building of such height, the walls on the ground floor would have to be more than two metres thick to hold the weight of the building.So another material was required to make skyscrapers possible. About this time, three buildings were put up that used iron or steel to support great weight with safety.They were the Crystal Palace in London, the Eiffel Tower in Paris and the Brooklyn Bridge in New York.From then on, architects started to experiment with buildings that had steel frames and they have made huge progress.Today, the tallest skyscrapers are a hundred storeys or more, compared to the first ten storeys skyscrapers, which seem tiny. Question 31: What is the passage mainly about? A. Why skyscrapers were needed. B. The most famous skyscrapers in the world today. C. The people who designed skyscrapers. D. Problems during construction of skyscrapers. Question 32: In the middle ages, people built tall churches because ________ . A. they were more beautiful B. they felt like approaching God C. they took in more people D. they started to build great cathedrals Question 33: The word "rocketed" in paragraph 2 mostly means ________ . A. rose B. dropped C. fluctuated D. drew Question 34: The word "they" in the last paragraph refers to ________ . A. buildings B. architects C. frames D. skyscrapers Question 35: According to the passage, which of the following is NOT true? A. Taller buildings were necessary because land was expensive. B. The problem with making a tall building with stone was its weight. C. Skyscrapers were needed as houses for the poor. D. In the past, the word ‘skyscraper’ had different meanings.

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