Uncle Wang: Here is a present for you, Kangkang.

Kangkang:  Thanks. What is it? Let me have a look.

Uncle Wang: Sorry. Guess, please!

Kangkang:  What shape is it?

Uncle Wang: It's a rectangle.

Kangkang:  How long is it?

Uncle Wang: It's about ten centimeters long.

Kangkang:  How wide is it?

Uncle Wang: It's about six centimeters.

Kangkang:  How heavy is it?

Uncle Wang: About 0. 25 kilogram.

Kangkang:  What do we use it for?

Uncle Wang: We often use it to listen to music. Sometimes we use it to see a movie.

Kangkang:  Oh, I get it. It must be an MP4.

Uncle Wang: Yes. It's an MP4! Here it is.

Kangkang:  Thank you, Uncle Wang. 

    Harmful microbes like bacterias, viruses and other germs are pathogens. They may enter your bodies and make you ill. The immune system is the body's defence system that protects you from illness and disease caused by the pathogens.

    The immune system is made up of non﹣specialized defences such as skin, tears and the acidic juice produced by the stomach, keeping you from the pathogens. It also has some highly specialized defences, which are different kinds of immune cells, grouped into phagocytes and lymphocytes. Phagocytes are a type of white blood cell. They are swimming around in your blood stream, always on the lookout for antigens﹣the pathogens that have entered your bodies. Whenever they see one, their will eat it. However, some antigens are hard to find and kill. Then lymphocytes, which are also white blood cells and the main types are B cells, T helper cells and T killer cells, Will be the killers of the sneaky antigens.

    B cells, T helper and T killer cells work together to find and kill these antigens. B cells produce substances, called antibodies, which stick to the antigen. When that happens, it will tell the T helper cells to come over and either: 1. help the B cells kill the antigen, or 2. call the phagocytes or T killer cells to move in for the kill. Once a B cell or a T cell attacks an antigen, they create cells to "remember" it. Those "memory cells" hang out in your blood if they see the same antigen again, they quickly recognize, it so your immune system can act faster at killing it.

    The immune system is more powerful than you probably imagine. Scientists from the University of Pennsylvania recently took immune cells from three patients with leukemia, then genetically changed them into "serial Keller "cells to attack cancer cells. The study was small but the results were groundbreaking. The modified immune cells increased at least 1, 000 times in the body and killed all the cancer cells. Therefore, more "memory cells" were created.

    The immune system can be developed. Eating lean protein food （beef, beans ）and food rich in vitamins A, C, and E（sweet potatoes, carrots ）, taking a 30﹣minute walk every day and reducing your stress levels, etc. will help you achieve it.

    Everyone needs friends. There is an old saying, "Friends are God's way of taking care of us." But how do you find real friendship and keep it?

    The American writer--Sally Seamans tells young students some smart ways to find friends. Sally says finding friendship is just like planting a tree. You plant the seeds（种子）and take care of it to make it grow.

    First, you should choose a friend. What makes a good friend? It is not because a person has money or good looks. A good friend should be kind and patient. For example, if you have a bad day, a good friend should listen to your complaints(抱怨) and do his or her best to help. To make a friend, you cannot be too shy. You should make each other happy and share your life.

    But things cannot always be happy. Even the best friends have fights. What should you do when you have a fight with your friend? You have to talk to him or her. When there is no one around, talk to him or her honestly. If he or she doesn't want to talk, you can write a letter.

    There are some steps to be friends again.

    Tell him or her how you are feeling; say what your friend did wrong and explain why you did this or that; Don't forget that friendship is the most important thing in your life.

    Everyone wants to find happiness. But sometimes looking for happiness can be as hard as looking for lost treasure. Just when you think you nearly reach it, something unexpected happens. This may trouble you a lot. Here are some tips for helping you find happiness.

    Don't put all your eggs in one basket. If you depend on one thing or one person to make you happy, it may be impossible. You need to have larger circle of friends.

    Follow your heart. When we go against our own thoughts, we usually feel sad. Follow your strong feeling and let it guide you to people and things that will improve your life. Day by day, you will be happier than before.

    Organize your ideas. Many people push away happiness when they think too much. Don't keep everything in head. Try making a list of lot of things that don't seem too big to manage on your own. You may find the list isn't as long as you thought. You can do most of the things by yourself.

    Look at your life as a whole. Most of the things that stop us from feeling happy are just some little things. Remember life is always going on and whatever the little thing is, it will finally end.

    Happiness can be hard to feel at times, so don't think there is something wrong with you if you don't feel it. The ways above will help you to feel more of it.

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    Andrew Carnegie was born in 1835 in Scotland. He was from a poor family. When he was twelve, his family moved to the USA. They wanted a better life. There, Andrew started to work right away. He got a job in a factory. He was a good worker, but he didn't like the job. Later, he changed his job. He worked at the Railroad Company where everybody liked him. He did many different jobs. His salary got higher every year.

    In his free time, Andrew loved to read. But in those days, the United States didn't have free public libraries. Luckily, he lived with a rich man with many books, who let young boys use his library for free, so Andrew could read as much as possible. He read throughout his life.

    Andrew learned a lot at the railroad company. He realized that the railroad was very important for big countries. He had a idea to start a business with railroads. He saved all his money and opened a business at the age of thirty years.

    First, his company made bridges for the railroads. Ten years later, it made steel for bridges, machines, and many other things. Soon he was the richest man in the world.

    Andrew liked to make money. But he believed it was very important to help other people. In 1901, he sold his company for $480 million. He started to give away his money to make new libraries and colleges all over the United States. He built 2811 libraries. Andrew also gave a lot of money to people who worked for peace. In 1903, he gave $1.5 million to build a Peace Palace in the Netherlands.

    Andrew Carnegie died in 1919.He was eighty-four years old. During his life, he gave away nearly all of his money. He gave away over $350 million for education and peace. There are colleges, libraries, hospitals, and parks named after Andrew Carnegie.He helped millions of people all over the world to study and learn.

    Have you ever wished that your life was like a reality TV show(真人秀节目)? Well, like it or not, things might be this way in the future.

    This is because of Google glasses. Glasses are the latest technology from Google. They have more exciting features(特征)than you could possibly imagine.

    For one thing, people who wear the glasses can shoot videos and record the sounds around them. So if your friend is wearing Google glasses, he or she can record your every move and broadcast live on the Internet for the world to see.

    There is a GPS system in the glasses. So if you get lost you can say" OK, Glass, where am I?", and it will find where you are and tell you where you need to 90.

    Google glasses are a bit like a helpful secretary. You can tell them what you want to write in an e—mail and they will type it for you.

    Since April 16, Google glasses have been on the market in small numbers. But by the end of the year anyone will be able to buy a pair for about 2, 500 yuan.

    Some people are not sure whether they find Google glasses cool or not. When someone is wearing Google glasses, it is not easy to see whether or not they are using them.