阅读下面材料, 在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。
Street art is a very popular form of art ____ is spreading quickly all over the world.
You can find it on ____ (building), sidewalks and street signs. Now even art museums and galleries ____ (collect) the works of street artists.
People often have different opinions about street art. Some think it is a kind of destruction (破坏) and ____ think it is a very beautiful new form of culture.
In the street art world graffiti (涂鸦） can be the most popular. It began in New York in the 1960s. First some young people painted words and images on the walls. They found the paintings could show their ____(disagree) against society. Later, this colorful, energetic style of writing became ____ (know) as graffiti.
Street artists do this for ____ reason. Some of them think they are closer to the people, while others try to express their ____ (politics) opinions.
In today's world, the Internet has a big influence ____ street art. Artists can show their pictures to audiences all over the world. The street art movement lives with the energy and life of cities. It will continue ____ (change) and grow.
中，双曲线中心在原点，焦点在
轴上，一条渐近线方程为
，则它的离心率为