1　You can find it on buildings，sidewalks，street signs and trash cans from Tokyo to Paris，from Moscow to Cape Town.Street art has become a global culture and even art museums and galleries are collecting the works of street artists.
Street art started out very secretly because it was illegal to paint on public and private property without permission.　 2　Some think it is a crime and others think it is a very beautiful new form of culture.
Art experts claim that the street art movement began in New York in the 1960s.Young adults painted words and other images on the walls and trains.This colorful style of writing became known as graffiti，whose art showed that young people wanted to rebel against society.
Street artists do their work for different reasons.　 3　They choose street art because it is closer to the people.Some artists try to express their political opinions in their work.Others like to do things that are forbidden and hope they won’t be caught.Advertising companies also use street art in their ads because it gives people the impressions of youth and energy.
　4　Artists can show their pictures to an audience all over the world.Many city residents，however，say that seeing a picture on the Internet is never as good as seeing it alive.
　5　There，it will continue to change and grow.

A．Street art is a very popular form of art that is spreading quickly all over the world.

B．Today，the Internet has a big influence on street art.

C．With the development of science and technology，different art styles come into the Internet.

D．The street art movement lives with the energy and life of a big city

E．People often have different opinions about street art.
F．Street art used to be illegal，but now has become popular.
G．Some of them do not like artists who make so much money in galleries and museums.