单项选择题


Questions 14~16 are based on a talk about graffiti, an art form for some people or violence for others. You now have 15 seconds to read Questions 14~16.
Why does the speaker cite the example of graffiti in the London underground

A.To show that mindless graffiti can provoke violence.
B.To show that Londoners have a special liking for graffiti.
C.To show that graffiti, in some cases, can constitute a crime.
D.To show that graffiti can make the environment more colorful.