Justin Bieber used to be an ordinary Canadian boy, but his life totally changed in 2008. With his great musical talent, this seventeen-year-old boy has become a superstar in the music industry.

    Justin Drew Bieber was born in 1994 in Stratford, Ontario and was raised by his single mother. Bieber learned to play musical instruments when he was very young. In 2007, he took part in a local singing competition in his hometown, and he did it just for fun. He never took singing lessons before but surprisingly he placed second in the competition. Then, with the help of his mother, he uploaded (上传) videos of him singing on a website and they successfully attracted the attention of thousands of viewers. His videos got popular through word of mouth and some of them have received up to 10,000,000 views.

    Justin Bieber would have never gotten a career in the music business without his videos. Scooter Braun, a former marketing executive (主管) of So So Def Recordings, had watched Bieber's videos and he was impressed by the boy's talent. Braun then contacted Bieber and he flew the boy into Atlanta seven months after the first video was posted. Bieber showed his talent in singing as well as his ability in playing musical instruments. He then got a record deal.

    In 2009, Justin Bieber released (发行) his first single “One Time” while he was recording the debut album (首张专辑). The single “One Time” tells a story about love. This song had success not only in Canada and the US, but also in the international market. Then he released his debut album “My World 2.0” in 2010 and the song “Baby” became the lead single. This album successfully entered the Top Ten Charts in seven countries. In June 2010, he started his first world tour in Hartford, Connecticut. One month later, he started recording his second album.

    The world itself is becoming much smaller by using modern traffic and modern communication means. Life today is much easier than it was hundreds of years ago, but it has brought new problems. One of the biggest is pollution. To pollute means to make things dirty. Pollution comes in many ways. We see it, smell it, drink it and even hear it.

    Man has been polluting the earth. The more people, the more pollution. Many years ago, the problem was not so serious because there were not so many people. When the land was used up or the river was dirty in one place, man moved to another place. But this is no longer true. Man is now slowly polluting the whole world.

    Air pollution is still the most serious. It's bad for all living things in the world, but it is not the only one kind of pollution. Water pollution kills our fish and pollutes our drinking water. Noise pollution makes us angry more easily.

    Many countries are making rules to fight pollution. They stop people from burning coal in houses and factories in the city, and from putting dirty smoke into the air.

    Pollution by carbon dioxide is now the most dangerous kind of air pollution. It is caused by heavy traffic. It is true that if there are fewer people driving, there will be less air pollution.

    The earth is our home. We must take care of it. That means keeping the land, water and air clean. And we must take care of the rise in population at the same time.

    A Samoan airline says that it is the world's first carrier to charge passengers by their weight. Samoa Air, which opened in 2012, asks passengers to give their personal weight during booking, which is then charged according to the length of a flight. The customers will also be weighed just before they board the plane.

    "It is believed that all people throughout the world are the same size," Samoa Air CEO Chris Langton said. "Airplanes always run on weight, not seats."

    "There is no doubt in my mind that this is the concept of the future. This is the fairest way of your travelling with your family or yourself."

    Though the airline introduced the plan last November, it caught people's attention last week when the carrier began international flights to neighboring American Samoa.

    Almost at the same time, a Norwegian economist, Bharat Bhatta, published a report suggesting that airlines should charge obese passengers more.

    The Pacific Islands contain some of the world's most common countries for obesity, many ranking in the top 10, according to the World Health Organization (WHO). Samoa is ranked number four, with 59.6 percent of the population considered obese, said the most recent WHO report.

    According to Samoa Air's latest schedule, the airline charges up to $0.57 per kg for flights in Samoa and $1.03 per kg for its only international flight to American Samoa, around 250 miles.

    Children under 12 are charged 75 percent of the adult rate, with fares also based on weight. Any overweight baggage is calculated at the same rate as the passenger's personal weight.

    The plan could actually prove cheaper in some cases, such as for families travelling with small children, and Langton said customer reaction has mainly been "amazingly positive".

    The idea of charging passengers by weight has been hotly discussed before, and in the US some airlines require those who do not fit into a seat comfortably to buy a second seat.

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    Daban town is famous for girls and windmills, while Loulan is a myth (神话) in the desert. Two thousand years ago, beside the beautiful Luobu Lake, there lay Loulan ancient city of the Silk Road. Businessmen from every country gathered there with lots of dancing parities. Everything shows that people in Loulan lived a rich life then.

    However, two thousand years later, this rich land suddenly disappeared from the map of China. It became an area covered with sand and dead tree trunks.

    Loulan was first "discovered" by a Swedish man named Sven Hedin in 1900, and people from America, Britain, Japan and Sweden all set foot here. Then in the 1930s, a Chinese named Huang Wenbi came to Loulan for the first time. He visited and studied this area and found many relics that were beautifully and carefully made.

    It is recorded that the ancient city of Loulan was the capital of the Loulan Kingdom during the Han and Jin Dynasties, and covered an area of some 10, 000 square kilometres. Inside the city, there are the ruins of government offices, temples and other old buildings. Outside the city there are some dried-up rivers and much farmland. In the past century many things have been dug up there including Han Dynasty coins, mirrors and many others of Greek and Roman times. All these things show that a lot of business between the East and the West once took place there.

    Lying on the northwest of the Lop Nur area, the Loulan Kingdom is now a lifeless area with endless ＂forests＂ of mounds (小丘) which aren't easily seen in other parts of the world. Its mystery has been attracting many people from many countries.

    Music is an international language. The songs that are sung or played by instruments are beautiful to all people everywhere.

    Popular music in America is what every student likes. Students carry small radios with earphones and listen to music before class, after class and at lunch. Students with cars buy large speakers and play the music loudly as they drive on the street.

    Adult drivers listen to music on the car radio as they drive to work. They also listen to the news about sports, the weather, politics, and activities of the American people. But most of the radio broadcast is music.

    Pop or popular music singers make much money. They make a CD or tape which radio stations use in every state. Once the popular singer is heard throughout the country, young people buy his or her tapes. Some of the money from these tapes comes to the singer. Wherever the singer goes, all the young people want to meet him or her. Now the singer has become a national star.

    Besides pop music, there are two other kinds of music that is important to Americans. One is called folk music. It tells stories about the common life of Americans. The other is called western or country music. This was started by cowboys who would sing at night to the cows they were watching. Today, any music about country life and the love between a country boy and his girl is called western or country music.

    Can exercise during childhood protect you against memory loss many decades later?Exercise early in life seems to have lifelong benefits for the brain,in rats at least.

    "This is an animal study,but it shows that physical activity at a young age is very important一not just for physical development,but for the whole lifelong track of cognitive（认知的）development during ageing,"says Martin Wojtowicz of the University of Toronto,Canada."In humans,it may delay the appearance of Alzheimer's symptoms（阿兹海默氏症）,possibly to the point of preventing them."

    Wojtowicz's team divided 80 young male rats into two equal groups,and placed running wheels in the cages of one group for a period of six weeks.Around four months later—when the rats had reached middle age—the team taught all the rats to connect an electric shock with being in a specific box.When placed in the box,they froze with fear.

    Two weeks later,the team tested the rats in three situations: exactly the same box in the same room,the same box with the room arranged differently,and a completely different box in a different room.

    The rats without access to a running wheel when they were young now froze the same percentage of times in each of these situations,suggesting they couldn't remember which one was dangerous.But those that had been able to run in their youth froze 40 to 50 percent less in both changed box settings.

    “The results suggest the amount of physical activity when we're young,at least for rats,has influence on brain and cognitive health—in the form of better memories—when we're older,"says Arthur Kramer of Northeastern University in Boston,who has found that,in humans,exercise promotes the growth of new brain cells.