Since 1984,Philadelphia has been cleaning up its act.One by one,graffiti（涂鸦）covered 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 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 Anti-Graffiti 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 MAP's 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 "Safe Streets,"Love and Care," and "Peace Walk".

    The MAP receives up to 50 requests for murals each week. Last year, the workers painted 140 murals."The making of a mural enters people's collective memory as an extraordinary, pleasant moment in neighborhood history," says Golden, who began as a muralist in Los Angeles.

    At first, muffled (听不太清的)conversations made researchers at a San Diego aquarium puzzled, but when a diver thought he was being told to get “out” of the water they realized the conversations were coming from a white whale.

    Noc was about one year old when he was caught off the Pacific coast of Canada. He was kept in an open-ocean pen (围栏) at the US National Marine Mammal Foundation in San Diego, California. After seven years at the Foundation, he began, automatically, to make unusual sounds, a report in the latest issue of the journal, Current Biology, said.

    “We thought of the whale' s vocalizations(发出的声音) as an attempt to imitate humans. Whale vocalizations often sounded as if two people were talking just out of the range of our understanding,” the authors said. “ 'These conversations' were heard several times before we finally realized the whale was the source.” The researchers realized it was Noc when a diver surfaced and asked, “Who told me to get out?” It was then that they realized the word “out”, which was repeated several times, had come from Noc. Later, his speech-like sounds were recorded in the air and underwater.

    Noc started making the sounds after seven years in the open-ocean pen, and continued making them for another four years. He died five years ago. Researchers have now analyzed the sound recordings. It was the first time that sound recordings had shown how such sounds imitated speech and were different from the usual calls of the species.

    The speech-like sounds were lower than normal whale sounds and much closer to those of the human voice. Also, whales talk to each other by blowing air through their noses, rather than using a larynx(喉), as people do.

    “We don't claim that our whale was a good imitator compared to such well-known imitators as parrots,” the researchers said. “However, the behavior we observed is an example of vocal learning by the white whale. It seems that Noc's close association with humans played a role in how often and how well he employed his human voice.”

Painting

    The art of creating pictures using colors, shapes and lines is called painting. Museums and galleries show the paintings of professional (专业的) artists. But painting is also a popular form of entertainment and creative expression.

    {#blank#}1{#/blank#}Experienced painters usually use a brush to apply oil paints to a canvas cloth surface. Young painters usually use watercolors on pieces of paper. Very young children may use finger paints to create paintings.

    Painters can use their art to express devotion to a religion, to tell a story, to express feelings and ideas, or simply to present a pleasing picture. Religious paintings often show a god or a scene from a sacred text (圣典). Other common subjects have been famous legends and events in history, as well as scenes from daily life. Artists also paint portraits (画像), or pictures of people{#blank#}2{#/blank#}All of these types of paintings show the human figure in some way.

    Some kinds of paintings do not focus on people. In landscape (风景) painting the focus is on scenes from nature. Artists also paint still objects such as fruits and vegetables{#blank#}3{#/blank#}Some artists communicate their ideas through pictures that do not represent any object.

    {#blank#}4{#/blank#}Paintings dating back 15,000 years have been found on the walls of caves in France and Spain{#blank#}5{#/blank#} Samples of painted pottery (陶器) from at least 5,000 years ago have been found in China and Iran. The ancient Egyptians decorated their temples with beautiful paintings. People in ancient Greece painted decorative objects such as vases in addition to the walls of temples.

A. These works are called still-life paintings.

B. These works can communicate a special feeling.

C. Humans have been making paintings for thousands of years.

D. People of all ages create pictures using a variety of materials.

E. Cave paintings generally show animals that early humans hunted.

F. The design of a painting is the plan of its lines, shapes and colors.

G. Sometimes artists make portraits of themselves, which are called self-portraits.

    Our summer vacation begins on July 15th and lasts nearly two months. Considering that my brain needs rest after a period of hard work, I, together with my family, went to our countryside, a very small farmhouse in which my grandparents used to live, to spend the summer. Obviously, life in the country is very different from that in the city.

    Early in the morning I took a walk along the field side. The air was fresh and pure. With a dog following, sometimes I ran a race in the meadows covered with tall grass. Sometimes I climbed up the hill to see the sun slowly yet steadily rise from the eastern horizon. The birds also sang restlessly among the bushes. In order to appreciate the quietness of the country, I gave myself entirely to nature, with a light heart and a happy mind.

    Sometimes in the afternoon I, together with my cousins, took a rod and went to the river to fish. It made the family happy when they saw me returning with a basketful of large fresh fish. When night came, I would sit at the door and tell the most wonderful and interesting stories to my cousins, who listened to the tale of wonder with open eyes and mouth.

    I wish I could enjoy such calm, pure and beautiful rural life forever.

    US people are overweight, eat lots of fast food and fill their homes with pets. At least that's what 21 European teenagers think.

    The students, 18 from Germany and 3 from France, are exchange students. They are studying in the US for a year. After a few days in the US, they said what they thought about the country.

    Most talked about the amount of fast food US people eat. It's not that the students don't eat fast food. They just don't eat as much.

    Laetitia Villeneuve from France said she eats fast food, usually McDonald's, only once or twice a year.

    "I like it," said Nora Koeberle from Germany. "But I couldn't eat it every day. I'd get fat. "

    Students are surprised at how big US people seem.

    "There are fat people in Germany," said Antonia Greimel from Germany. "But not as many as there are here."

    They also spoke about the animals. Silvana Wolfram from Germany said she had heard about how people had lots of pets in the US.

    Other ways of US high schools interested the students.

    For example, Koeberle said she wouldn't be able to play an instrument or sports as part of her classes in Germany. She can in the US.

    But the best thing about US high schools is something the European kids can't get back home. "I do wish we had parties," Koeberle said.

    People who sleep fewer than six hours a night are more likely to die early, researchers in University of Warwick have found in a recent study. They discovered that people who slept for less than six hours each night were 12% more likely to die before the age of 65 than those who slept the recommended six to eight hours a night.

    The researchers pointed out that previous studies had shown that the lack of sleep was associated with problems like heart disease and high blood pressure. However, the researchers also found that sleeping too much was linked to an early death. Those who slept for more than nine hours a night were 30% more likely to die early, as an article in the latest Sleep suggested. That directly contradicts another passage in the same journal last month suggesting that people who slept for ten hours or longer a night were more likely to live to 100. This was thought to be because people who lived into extreme old age were healthier and therefore slept better.

    However, the authors of the latest research contradicted this and suggested that long sleep was a sign of underlying illnesses such as depression and low levels of physical activity. Professor Francesco Cappuccio at the University of Warwick said: "While short sleep may represent a cause of ill-health, long sleep is believed to represent more an indicator of ill-health."

    He also mentioned: "Modern society has seen a gradual reduction in the average amount of sleep people take, and this pattern is more common among full-time workers, suggesting that it may be due to social pressures for longer working hours. On the other hand, the worsening of our health is often accompanied by an extension of our sleeping time."

    "Consistently sleeping six to eight hours per night may be good for health. However, whether to achieve the goal depends on various factors such as the environment as well as measures of public health aimed at favourable changes of the working environments," Professor Francesco Cappuccio added.