18. D　根据空后的介词about可知，应该用形容词happy。

　　19. C　从后边的as possible可看出，此句采用的是as...as结构，又因为customers为可数名词复数，所以此处选many。

　　20. B　表示“如果是那样/这样的话”时，常用if so, in that/this case。

　　.阅读理解

　　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.

　　The MAPs work, says Golden, is all about developing a sense of community(社区).

　　When a neighborhood requests a mural, the MAP works with the people there to develop a message. Some messages have been

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