Swimming is a very popular game in the world. Many people like swimming in summer, and in the other three seasons too. They think water makes them feel cool and swimming makes them keep healthy. But sometimes it's also not safe if you don't know how to keep safe when swimming.

    If you swim in a wrong place, it may not be safe. A lot of people die (死) when they are enjoying themselves in the water, and most of them are students. Now some people are not careful in swimming. They often think they can swim very well, so nothing will happen to them in water.

    If you go swimming in summer, remembering the following rules will be very useful. Don't get into water when you are by yourself. If there is a “No swimming” sign, don't get into water. If you remember these, swimming will be safe and enjoyable.

    Marco Polo was born in Italy in 1254. When he was 17, he travelled along the Silk Road with his father, who wanted to trade with the Chinese. Finally, they arrived in Beijing. They were guests at the Emperor's Palace Marco was very clever and could speak four languages. The Emperor was impressed by him and they became friends. He asked Marco to serve in his court (宫殿) and sent him to do many important jobs all over the country.

    Marco was amazed by how beautiful China was. He was impressed by Beijing and the Emperor's Palace, especial the Summer Palace which was described as "The greatest palace that I've ever seen". The walls were covered with gold and silver and the hall was so big that it could easily hold 6,000 people for dinner.

    Marco was also attracted (吸引) by the inventions and developments in China which couldn't be found in Europe at that time. Marco was surprised to see Chinese people using paper money in the markets. In Europe, people paid for goods(货物) with gold and silver. He could not understand how people paid for food and valuable things with paper! He was also puzzled by the black stones people used to burn to produce heat. The black stones were coal, but Marco had never seen coal before!

    After he served the Emperor for 17 years, in 1291, Marco returned to Italy. He was a very wealthy man then. A writer wrote down all the stories that Marco told him in a book called The Description of the World, which became one of the best-selling books in Europe.

    People enjoyed the book, but many of them thought that Marcos stories about China were too fantastic to be true. However, Marco always stood by his tales. Just before he died, aged 70, Marco was asked the question, “Was it all true?” And this was his answer, “I have only told a half what I saw!”

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    Do you know S.H.E? It is a singing group from Taiwan, China. There are three girls in it. They are Selina, Hebe and Ella. They are very popular.

Lots of girls like Selina because she is very beautiful. She has long, straight hair. She is of medium height and she is thin. Hebe is a nice girl. She isn't tall but she has long, straight hair, too. She likes to wear cute hats. Ella is really cool! She looks like a boy. She has short, straight hair and she likes to wear jackets and pants. Many fans think that she is the best singer.

    Drones（无人机）are like planes, but come in many shapes and sizes. They have no pilots and controlled from outside the drones. During these years, they have been used to attack（进攻）enemies or moved goods in dangerous areas.

    Now small drones are a part of people's lives. For example, people use drones to take photos or make videos. Besides, a drone delivery (投递) service has proved successful.

    Online store JD can use drones to deliver small packages（包裹）. It has built several drone stations so that it can load(装载) and deliver its packages.

    Drones have made our shopping experience different. We can order a new coat in early morning and it will be delivered before we finish breakfast.

    Bizzby Sky, a UK company, has created a delivery service for small goods. Open a smartphone app(应用软件), enter your address, set a time and pay enough money for the delivery service. Then in minutes, a drone will do tasks for you.

    However, any drone company needs government permission (允许) to fly its drones in many countries. We believe we will see more and more drones with goods fly in the sky very soon.

   In thetime it takes you to read this sentence, the population of the Earth will have grownby 10 people. That may not sound much, but it is about 14,000 people an hour. Thatis the same as adding most of the population of Germany to the world every year!

   Most of these new people are born in developing countries. These countriesare found in much of Africa, South America, and parts of Asia. In the developedcountries of Europe and North America, the population is growing very slowly. Thisis because women in these countries have, on average, only one or two children.In the developing countries, many women have five or more children. In 1950, aroundone quarter of the world's population lived in the developed countries. By 2050,these countries will be the home to only around one tenth of the world's people.

   In the developing countries, more than one billion people already live belowthe poverty line (贫困线).These people don't have enough food to eat and they live in poor housing;children get little or no time at school and suffer from many kinds of diseases.

   The United Nations (UN) tries to guess population growth. At the beginningof the 21st century, the world's population was around six billion people. The UNhas said that the world's population will level off at 12. 5 billion people by theyear 2100. Other people think the world's population will continue to grow, reaching14 billion people before it becomes stable or even falls.

    Vienna is a beautiful old city on the River Danube in the center of Europe. It's the capital city of Austria and the center of European classical music. In the 18th century a lot of musicians came to study and work in Vienna.

    In the Strauss family, there were two composers called Johann Strauss: the father and the son. The father, Johann Strauss the elder, wrote and played music for traditional dances, called the waltz. His dance music made him famous all over Europe. The son, Johann Strauss the younger, was also very successful and popular. He wrote over 150 waltzes. In 1867 he wrote The Blue Danube waltz.

    Mozart was another very important composer. He was born in Austria in 1756. Before he was six, he played not only the piano but also the violin. His family took him around Europe and he gave concerts in many cities. He wrote hundreds of wonderful pieces of music. But he became very poor and died in 1791 when he was only 35. Like Johann Strauss, father and son, he was a great European musician, and many people still think his music is perfect.