When is cleaning walls a crime? When you’re doing it to create art, obviously. A number of street artists around the world have started expressing themselves through a practice known as reverse graffiti (涂鸦). They find dirty surfaces and paint them with images or messages using cleaning brushes or pressure hoses (高压水管). Either way, it’s the same principle: the image is made by cleaning away the dirt. Each artist has their own individual style but all artists share a common aim: to draw attention to the pollution in our cities. The UK’s Paul Curtis, better known as Moose, operates around Leeds and London and has been commissioned by a number of companies to make reverse graffiti advertisements.

        Brazilian artist, Alexandre Orion, turned one of Sao Paulo’s transport tunnels into an amazing wall painting in 2006 by getting rid of the dirt. Made up of a series of white skulls (颅骨), the painting reminds drivers of the effect their pollution is having on the planet. “Every motorist sits in the comfort of their car, but they don’t give any consideration to the price their comfort has for the environment and consequently for themselves,” says Orion.

        The anti-pollution message of the reverse graffiti artists confuses city authorities since the main argument against graffiti is that it spoils the appearance of both types of property: public and private. This was what Leeds City Council said about Moose’s work: “Leeds residents want to live in clean and attractive neighborhoods. We view this kind of advertising as environmental damage and will take strong action against it.” Moose was ordered to “clean up his act”. How was he supposed to do this: by making all property he had cleaned dirty again?

        As for the Brazilian artist’s work, the authorities were annoyed but could find nothing to charge him with. They had no other option but to clean the tunnel—but only the parts Alexandre had already cleaned. The artist merely continued his campaign on the other side. The city officials then decided to take drastic action. They not only cleaned the whole tunnel but every tunnel in Sao Paulo.

解析：D。根据题干中的city officials可定位至原文最后两句。这两句说到，市政府官员随后决定采取严厉措施。他们不仅清理了整个隧道，还一并清理了圣保罗的每一条隧道。也就是说，政府官员清理了所有隧道，这样奥里恩就没有地方可以涂鸦了，因为奥里恩就是通过清理部分隧道墙壁来进行反向涂鸦的艺术创作的，故正确答案为D。

错项排除：原文最后一段说到，虽然当局对于奥里恩的涂鸦作品感到很恼火，但却找不到任何可以指控他的罪名。他们别无选择，只能去清理隧道。由此可知，清理隧道是政府的行为，而且他们也无法指控奥里恩污染环境，故A、C两项错误。B项利用原文词drastic action作干扰，但原文倒数第二句说的是“市政府官员随后决定采取严厉措施”，并没有提到要禁止（ban）所有反向涂鸦，ban一词在文中没有依据，故B项错误。