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.
What do some New Yorkers think of graffiti？
A. It will bring a lot of trouble to the local people.
B. It is a popular form. of art.
C. It will spoil the natural beauty of their surroundings.
D. It is popular among rock stars.
The word "contingencies" in the fifth paragraph means ______.
A. the making of tools
B. dependent conditions
C. incidental thoughts
D. events that may occur
What do you think the woman is？
A university student.
B. A landlady.
C. A researcher.
D. A repair woman.
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