根据短文理解，完成下列各题。

      Have you noticed your life becoming a little easier? Now, when you go to a certain shopping mall, you can enjoy its free Wi-Fi there. When you want to take a taxi, you can book one with your phone. In fact, all these can be seen as the basic parts of a smart city.

     The idea of a smart city was brought up by US company IBM in 2010. Generally, a smart city is a city that uses digital technologies such as the Internet to improve city planning, save money and resources, and make our life convenient. How smart can a city be? Here are great examples that we can learn from.

      In 2009, Dubuque became the first smart city in the US. The city used smart water meters to take the place of traditional water meters. They can detect（探测〉water waste and leakage（泄漏）and send data to let the house owner know. The same system is used for other city resources like electricity and natural gas. This way, people know how they use their resources and are glad to help reduce waste.

       Santander in Spain also gives us a look at the future. If people point a phone toward a nearby bus stop, the phone immediately shows all bus lines that serve the stop as well as their arrival times. The government organized a research team and provided an App（应用程序〉that collects data on almost everything: light, temperature, and the movements of cars and people. Opening the App near a supermarket provides immediate information on special.

    Many scientists think that the earth is getting warmer and warmer. If the change continues, the natural world and human society will face danger. Scientists believe human activity is responsible for the climate change. We produce too many greenhouse gases. They keep heat in the air and make the earth warm.

    Many of the world's governments agree. And they want to solve the problem. So from December 7 to 18, 2009, they held a conference in Copenhagen, Denmark to talk about global warming and climate change.

    Representatives(代表) from 192 countries and regions went to the meeting. Although they have not reached an agreement, the Copenhagen Accord(《哥本哈根协议》) was an important beginning to save the earth. It was made by a small group of countries including China, the US, India, Brazil and South Africa. Some other countries at the conference also showed support.

    What are the key points of the Copenhagen Accord? The accord limits global temperature increases to 20C by 2050 compared to pre-1850. Scientists think it could help the world to avoid serious climate change.

    The accord also says that developed countries must promise to cut greenhouse gas emissions(排放) to the UN by January 31, 2010. The accord asks developed countries to give money to help developing countries.

    Many countries and organizations are disappointed that the conference didn't reach a legal document(法律约定). And they think the accord is not clear enough about its goals.

    African leaders are worried that the goal of a 20C global temperature increase isn't good enough, because it will mean a much higher increase in temperature across Africa. This could cause big problems like food and water shortages across the continent.

    Still, UN Secretary General Ban Ki-Moon believes the conference was an "improvement".

    Rock art is the name given to pictures drawn on rock by ancient peoples. In the American Southwest, rock art can be seen on the walls of caves and mountains. Many of these places are in the Four Corners area, where the states of Arizona，Colorado, Utah, and New Mexico meet. More than 7, 000 rock art places have been found just in Utah, where the area's dry climate(气候)has helped keep the art.

    There are three forms of rock art. The first is petroglyphs, which are pictures carved(雕刻)into the surface of rock. A sharp(尖利的)stone may have been used as a carving tool. A heavy stone may have been used to hit the sharp stone into the surface. The second form of rock art is pictographs, which are pictures painted on the rock. The paint was made from plants and trees. The artists painted with fingers, brushes made from hair，or bird bones. The third kind of rock art is geoglyphs(峡口浮雕), which are designs made in the ground by taking away stones.

    Some rock art shows faces, hands, animals, and trees. Other pictures are symbols such as lines, circles, and squares. Some scientists think these symbols marked the location of water or good hunting grounds. Some think the symbols were put there during special celebrations. Others think the symbols showed the movement of planets and stars. Still others believe that they were just doodles.

    Some rock art may be a form of writing. Large scenes are shown on mountains. Some scenes seem to tell a story. A hunting scene may include animals and people with hunting tools. A scene with many people holding hands could mean friendship. Rock art in caves may have been a way to decorate the artist's home.

    Some rock art in the Southwest is about 200 years old. Other rock art may be 10, 000 years old. Scientists think an ancient people called the Anasazi created the older works. They were farmers and lived in caves.

    ①If you have a chance to go to Finland(芬兰), you will probably be surprised to find how "foolish" the Finnish people are.

    ②Take the taxi drivers for example. Taxis in Finland are mostly high-class Benz(奔驰) with the money of two US dollars a kilometer. You can go anywhere in one, tell the driver to drop you at any place, say that you have some business to do, and then walk off without paying. The driver would not show the least sign of being nervous and worried.

    ③The dining rooms in all big hotels not only serve their guests, but also serve outside diners. Hotel guests have their meals free, so they naturally go to the free dining rooms to have their meals. The most they would do to show their good faith is to wave their registration(登记) card to the waiter. With such a relaxing check, you can easily use any old registration card to take a couple of friends to get the meals free.

    ④The Finnish workers are paid by the hour. They are very much on their own as soon as they have agreed with the boss on the pay. From then on, they just say how many hours they have worked and they will be paid accordingly.

    ⑤With so many mistakes in everyday life, surely Finland must be a place to those who love to take "petty advantages"(小便宜). But the strange thing is, all the taxi passengers would always come back to pay their fare after they have done their business; not a single outsider has ever been found in the free hotel dining rooms. And workers always give an honest record of the exact hours they put in.

    ⑥As you can see, living in such a society has turned everyone into a real "gentleman". In a society of such high moral(道德) practice, what need is there for people to be on guard against others?