This is Mrs. White. Now she is teaching math. She works in a middle school. She lives in London, Mrs. White and Mr. White have three children. They all love animals and they have a big dog and a cute cat.

    Mrs. White is Sophie's aunt, Sophie lives and studies in Liverpool, but now she is in London. She is on her holiday here. She wants to do some shopping with her aunt.

    Mrs. White's son Arnold doesn't like shopping, but he loves going out with friends. They usually go to a park to play soccer or basketball in the afternoon. Today, Arnold isn't playing soccer or basketball. He is swimming.

    Mr. White works for a company (公司). He isn't working today, because he isn't feeling well. He is in a hospital now.

    When you're closing your eyes and hitting your pillow, you're probably not giving much thought about the sleeping position throughout the night. Most people don't change their sleeping positions throughout their lives. The following is why you might want to pay more attention: Your sleeping position can actually say a bit about who you are and what your personality is like.

    There are many sleeping positions. The fetal (胎儿的) sleeping position is generally the most common sleeping position. Fetal sleepers sleep on their side, they move into a position in which their body makes a rounded shape. People who sleep in the fetal position are often quite sensitive and generally shy. They are often worried or nervous and don't focus their attention on the main problem, but get into trouble on very small pieces of information.

    The log (木头) sleeper rests on the side with a straight body when hands and legs are kept at the sides. These sleepers are often relaxed, but also can easily believe lie-tellers. If you're a log sleeper, you might want to keep in mind that it's good to be easy-going and have less stress, but don't be so quick to go with the flow (流) at all times.

    The third one is the soldier position. Soldier sleepers typically lie on their backs with both arms close to their sides. In general, they are the strong and silent type. However, they can also put the pressure on. "They can be quite strict with themselves as well as others," a scientist added.

   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.