What is the sky? How high is it? What color is it? What birds can live above it? These questions are difficult to answer, aren't they? In fact, the sky has no color. Then why does the sky look blue?

    We know that there is air around the world. When planes fly, they need air to lift their wings. Planes can't fly very high. That is because the air gets thinner when they go higher. The same will happen to us if we go high enough. If we go up about 1,200 kilometers from the earth, we'll find no air there. Some birds can fly into the sky as high as a plane, but they cannot fly or live without air.

    Looking up above us, you will see the blue sky with white clouds. It is usually light blue. The color would be bluer when you see on the top of a high mountain. And you will see fewer clouds in the sky between you and the sun. Sometimes the sky doesn't look blue. When the sun rises and falls, you will see red, orange and other colors in the sky, such are the most beautiful moments of the day.

    Who can see the colors of the sky high above the earth? The astronauts! They can see those beautiful colors of the sky from the outer space. However, before flying into the outer space, they sit in a spaceship high above the earth and there is no air at all. The sky would be that dark and its color would be black.

    Now you may understand that we see colors because the air scatters (使散射) the sunlight. Light travels through the air. Without air there would be no colors.

Music is good for us. According to the new study from the World Health Organization (WHO), music can 1 us happy and healthy. For example, when I feel 2 listening to some classical music helps me relax. When I'm down, I like pop music full of hope and love. It is easy for 3to fall asleep with light music. Some doctors 4 that people who love music may have a long life.

Near my house, a man and his wife have a small music house with mood music(情调音乐). People like to spend time here when 5are plying different kinds of music. Sometimes, we are lucky to hear some famous singers sing songs written by themselves. The songs are 6beautiful that we sing along with them. We communicate(交流)with one another 7 his special language. The most moving music is Chinese folk music(乡村音乐). It 8_us the sweet days in the past.

Everyone of us, rich or 9, young or old, may have his favorite song. 10 will be together with us as long as we live.

China is a large country. It has special cultures with a very long history. 

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Chinese is a little difficult language. Chinese writing {#blank#}8{#/blank#} （develop） for over 4，000 years. It has thousands of characters. A character stands for a word and also a {#blank#}9{#/blank#} （mean）. Besides Putonghua，Chinese people speak some other {#blank#}10{#/blank#}（form） of the language，and there are many kinds of dialects （方言）.