Comprehension activities and vocabulary

The shape of structures has Rellenar huecos (1): JXUwMDJkJXUwMDFiJXUwMDBhJXUwMDAxJXUwMDE3JXUwMDE1JXUwMDA4JXUwMDAxJXUwMDBi modifications with the use of different materials and systems of construction. In general, the tendency has been to make Rellenar huecos (2): JXUwMDJiJXUwMDA3JXUwMDA2JXUwMDA3JXUwMDE2JXUwMDE3JXUwMDAxJXUwMDA3JXUwMDE3JXUw MDE2 thinner; to make taller buildings with a smaller base (towers, skyscrapers, etc.) and to make larger surfaces without intermediate Rellenar huecos (3): JXUwMDJiJXUwMDA2JXUwMDA1JXUwMDAwJXUwMDFmJXUwMDFkJXUwMDA2JXUwMDA3 , starting from small Rellenar huecos (4): JXUwMDNjJXUwMDBiJXUwMDAyJXUwMDA4JXUwMDE2 with a diameter of a few metres to the huge pavillions or Rellenar huecos (5): JXUwMDJiJXUwMDA3JXUwMDE1JXUwMDA1JXUwMDBkJXUwMDFjJXUwMDE4JXUwMDFl we can build today.

This has been achieved thanks to the improvements in the Rellenar huecos (6): JXUwMDNjJXUwMDAxJXUwMDE2JXUwMDFhJXUwMDBlJXUwMDA5 of structures, the possibility of making calculations instead of trial and error methods (as in  Rellenar huecos (7): JXUwMDM5JXUwMDBmJXUwMDBkJXUwMDBhJXUwMDBjJXUwMDBiJXUwMDFh times) and the use of materials with better characteristics. Nowadays, we use Rellenar huecos (8): JXUwMDM0JXUwMDBkJXUwMDE1JXUwMDAwJXUwMDFkJXUwMDBhJXUwMDA2 structures made of reinforced concrete or steel to make modern blocks of flats.