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The life people live today is quite different from that in the past. There is no dthat the modern car has changed people's life a great deal. Before the invention of the car, people had to travel by rail, on horseback or by horse-drawn carriage, or on foot. Using horses for traveling was slow and certainly, walking was even slower. Cars allow people to spend ltime travelling long distances. Cars also san enormous (巨大的) problem caused by using horses for transport in cities: manure (粪)! There were so many horses in large cities that it was almost impossible to get rid of the manure. This could easily drive people m. In most people's m, cars cause pollution, but the first cars actually made cities cleaner!