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.

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Mr. Green has a fruit shop in the town. He is friendly to the people, so people like to buy fruit in his shop. 

One day, Mr. Green brings some grapes home for his grandson Steven because he knows his grandson likes eating grapes best. He puts these grapes in the kitchen. After lunch, he goes back to his shop. That afternoon Steven comes back from school. He looks around for something to eat and finds the fruit. "Great!I am so lucky today!Grapes are the best things in the world!"

Mr. Green gets home after he closed his shop in the evening. When he sees Steven, he asks, "Do you have the grapes?" His grandson answers, "Yes. And I eat all of them. "

"Do you wash them?"

"Oh, I forget. I am too hungry. What should I do?"

A few minutes later, Mr. Green finds that Steven is drinking water. 

"Are you thirsty? Why are you drinking so much water?" asks Mr. Green. 

Steven says, "I want to wash the grapes in my stomach(胃) with the water. "

Hi, I'm a middle school student. I'm Judy. In my class there are thirty-eight students. How do they go to school every day? Seventeen of them take the bus because they live far from the school. Six students walk. They think walking is good exercise. Fifteen students ride their bikes to school because they like riding bikes very much and their homes are not far from the school. No one goes to school by car. How do you go to school? Haha, I'm one of the fifteen.

It's Sunday afternoon and the weather is sunny and hot, My friends and I are in a large and beautiful park. We' re having a good time. 

Jack and Tom are swinging. Steve, Alice, John and Tim are playing hide-and-seek (捉迷藏). Rose, Mary and Lisa are skipping (跳绳). They re good at skipping. Susan is reading a book. Tina and Kate are chasing after my pet dog. They 're running around happily. 

We can see a lot of people in the park. Some are running and some are walking slowly. Look!

A boy and a girl are drawing pictures. Their parents are sitting next to them. They' re talking about something. 

Everyone is having a good time in the park. The park is a great place to have fun.