Объяснение:
1)The first permanent cinema was Thomas Tally's Elektric Theater ,which opened is Los Angeles in 1902 .
2)1907 ,there were more than 4000 cinemas in the USA
3)Where audiences watched silent comedies,dramas and news stories ,with a pianist providing music
4)but it was the introduction of sound between 1926 and 1930 which really revolutonized the cinema
5)Film technology didn't change much until the 1970s,when surround-sound became popular.
6)These days digital projectors produce clearer images ,and as 3D technology improves ,films will seem more realistic.
