Forests have always been useful and important to men who make use of them in many ways. Every day trees are serving man everywhere. Trees supply man with fruits and building materials in the form of wood. Without trees it would be impossible to build houses, boats, bridges and so on. Furniture such as desks, chairs and beds is made of wood. Trees can stop man from the terrible heat. They're also useful in preventing(阻止) good and rich top soil from being washed away during heavy rains. If there were no forests, heavy rains would wash away the rich surface(表层) soil that is so important to plants. The result is that the land will become a desert. There are plenty of desert areas in the world. A long time ago these desert areas used to be very rich areas, but men in the past had no enough knowledge about science of nature, and they cut down too many trees in the area where they lived and never planted new ones. By and by, the rich surface soil was blown and washed away by strong winds and heavy rains. In the end the rich land changed into useless deserts where nothing could grow.

    The largest animal ever to live on Earth is the blue whale. It weighs about 80 tons--more than 24 big elephants. It is more than 30 metres long. A new baby whale weighs as much as a big elephant.

    Cats won't die if they fall off very high places because they can turn themselves up the right way so as to keep their bodies safe. One cat fell off 32 floors onto the street, but it was just hurt a little.

    A bear can run as fast as a horse.

    A new-born panda is smaller than a mouse and weighs about 100 grams.

    Elephants are the most careful animals in their love. A male elephant may show his lady love for up to three years until the female elephant takes his love. They often show their love by touching each other's body.

    Usually, wolves do not hurt people. For years a Canadian newspaper says that they would give anyone a lot of money if he or she could show that a wolf could hurt a person. But nobody could do that. Wolves do not usually go together though they may do this in winter and they only hurt people at an unusual time.

    Every year on April 22, People all over the world celebrate Earth Day. It is a time to work to keep our earth clean. People plan projects to clean up the land, air and water.

    U.S. Senator Gaylord Nelson first thought of the idea for Earth Day in 1962 when he saw polluted rivers and cities with smoke. He needed to get support from Americans to clean up the earth. Finally, on April 22, 1970, 20 million Americans celebrated the first Earth Day! Now many countries around the world celebrate it, and you can, too.

    How can you celebrate Earth Day? Here are a few ideas:

    Join a clean-up project-Clean up your street or a favorite beach.

    Save energy-Turn off the lights when you leave a room, and use public transportation.

    Use less water.

    Reduce(减少)/ Reuse/ Recycle ― Practice the three Rs: First, reduce how much you use. Then reuse or recycle what you can.

    You can make a difference on Earth Day and every day!

    We all know that many women like to wear dresses. They enjoy many kinds of colourful and popular dresses. But have you ever heard of a 4D dress?

    Jessica Rosenkrantz in the USA used 3D printing technology to make a very special and new dress. It will help with the problems of different styles for women's dresses.

    The dress maker called the special dress a "4D dress". It is like the fabric(织物). It can turn into different kinds of shapes.

    The company, in Massachusetts, the USA, also made a smartphone and an app(应用软件). They can help women to control their dresses. If women use the phone and the app, they can change the colour, the style and many other things of the dresses. Isn't it very interesting?

    When she talked about her work, Jessica said, "There will be many more changeable dresses for women in the future. I am interested in making them too. I can't wait to make different kinds of new dresses for women."

How to be a friend of yourself?

We often pay attention to developing relationships with others. However, we forget the basic step: being friends of ourselves. How can we have good relationships with others if we don't even have good relationships with ourselves?{#blank#}1{#/blank#}.

First, forgive(原谅) yourself. It's true that you are not perfect, and neither is everybody else. It's normal for everyone to make mistakes.{#blank#}2{#/blank#}.

Second, accept things you can't change. There are many things you cannot change, such as your background and past.{#blank#}3{#/blank#}If you face the things you can't change, just smile and move on.

Third, focus on(聚焦于) your achievements. You can try making a list of your achievements, which do not have to be big things. There are a lot of small but important achievements in our life.{#blank#}4{#/blank#}

Last but not least, stop comparing yourself with others. You are unique.{#blank#}5{#/blank#} Your success is not determined(决定) by other people. Instead, it is determined by your own life purpose.