C．Street art started out secretly because few people liked it.

　　D．It is illegal for street artists to travel around big cities.

　　答案　A　[细节理解题。根据第三段In many cases, they had trouble with the police and the local government.可知，在20世纪60年代，涂鸦艺术家经常与警察和当地政府发生冲突。]

　　4．Why do some advertising companies use street art in their ads?

　　A．Because it impresses people with youth and energy.

　　B．Because it is the fastest way to introduce a new product.

　　C．Because it helps them save much money.

　　D．Because it is closer to the people.

　　答案　A　[细节理解题。根据第四段Advertising companies also use street art in their ads because it gives people the impression of youth and energy可知，应选A项。]

　　B

　　Since 1984, Philadelphia has been cleaning up its act. One by one, graffiti­covered walls are being changed into outdoor art. So far, more than 1,800 murals(壁画)have been painted. Philadelphia now has more murals than any other American city.

　　The walls that were once ugly with graffiti(涂鸦)are now covered with beautiful pictures of historical heroes and modern art, thanks to the Mural Arts Program (MAP). Its work makes schools and public places attractive, and its citizens very proud. The program began as part of Philadelphia's Anti­Graffiti Network. Jane Golden is the MAP's artistic director. “When people ask me what our program is about，”she says，“I answer them with one word: hope.”Each year, the MAP offers youth art programs and workshops. Some one­time graffiti writers even help paint MAP murals.

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