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.

There are many wetlands (湿地) in China ‒ and some of them have become the world's important wetlands. The Chinese Yellow Sea Wetlands are {#blank#}1{#/blank#} them. They are in Yancheng, Jiangsu Province. They are {#blank#}2{#/blank#} to many different kinds of animals. The world's {#blank#}3{#/blank#} Milu deer nature reserve (自然保护区) is on these wetlands. More than 700 Milu deer live there. There are not many red-crowned cranes (丹顶鹤) {#blank#}4{#/blank#} in the world, but every winter, you can see some in the red-crowned crane nature reserve in the Yellow Sea Wetlands.

    The {#blank#}5{#/blank#} in the wetlands is neither too high nor too low. There is  {#blank#}6{#/blank#} rain and sunshine, too. They are a good place for wildlife. But offering food and shelter for special kinds of animals is not the  {#blank#}7{#/blank#} reason we need to protect wetlands. Wetlands are important {#blank#}8{#/blank#} they also prevent floods. But some people want to {#blank#}9{#/blank#} the wetlands to make more space for farms and less space for wildlife.

    More people are beginning to realize the {#blank#}10{#/blank#} of wetlands and wildlife. Every year, on Feb 2, many activities are held to teach people about the wetlands.

The traditional Chinese lunar calendar divides the year into 24 solar terms. Grain Rain（谷雨）, at the last term in spring, generally starts on April 20th and ends on May 4th.

Grain Rain comes from an old saying, "Rain brings up the growth of hundreds of grain", which shows that this period of rainfall is very important for the growth of crops. Here's something that you may not know about the Grain Rain.

Seasonal characteristics

When the Grain Rain ends, the summer starts And the temperature rises much higher than it does in March, With dry soil and heavy winds, sandstorms may happen more often.

Customs in southern China

There is an old custom in southern China that people drink tea on the day of Grain Rain. Spring tea during Grain Rain is good for the eyes.

Traditions in northern China

People in northern China have the tradition to cat the vegetable toona sinensis（香椿） during Grain Rain. An old Chinese saying goes "toona sinensis before the rain is just like silk". The vegetable is good for the stomach and skin.

Grain Rain Festival

The Grain Rain Festival is celebrated by fishing villagers in northern China. Grain Rain marks the start of the fisherman's first voyage（航行） of the year. The custom dates back to（追溯到） more than 2000 years ago.

①" Class, this is John Evans, " Mrs. Parmele introduced him to us, trying to give him a warm welcome. We saw a boy in old clothes. John looked around and smiled, hoping somebody would smile back. Nobody did. He kept on smiling anyway. I held my breath as Mrs. Parmele looked around the classroom, hoping she wouldn't notice the empty desk next to mine. She did, and pointed him at that desk. He looked over at me as he sat down, but I looked away. 

②By the end of his first week, John was at the bottom of our class. I told my mother one evening at dinner, " He even doesn't know how to count. " However, as I ate lunch with him the next day and listened to him, I realized that it was pleasant to be with him. After lunch, I decided that I would be John's friend. 

③One night, as Mother came into my bedroom, I said, " Mom, tomorrow is John's birthday, and he's not going to get anything. Nobody cares. "" Don't worry, " Mom said as she kissed me goodnight. "I'm sure everything will be fine. "

④I wished John a happy birthday in the morning, and his smile showed me that he was glad I had remembered. By mid- afternoon I had almost decided that birthdays weren't that important. Then, as Mrs. Parmele was writing on the blackboard, I heard a familiar(熟悉的) voice singing the birthday song. I looked up and saw Mother coming through the door with a tray(托盘) of cupcakes and a present in her hand. Mrs. Parmele also joined in. Mother found John looking like a rabbit in car headlights. She put the cupcakes and the gift on John's desk and said, " Happy birthday, John. " John stood there with his mouth open, unable to believe what was happening. While John ha ppily shared his cupcakes with the class, taking the tray from desk to desk, I caught Mother watching me and she smiled. 

⑤John Evans moved away soon, and I never heard from him again. But I always remember the happiness in a boy's eyes, and the taste of the sweetest cupcake. 

It's always a happy moment when you get some pocket money. But have you ever thought about how to spend your pocket money wisely？Here is some advice. 

Make a list. 

When you get your pocket money，don't get too excited. We all have a lot of things that we want. But do you really need them？That's why it is necessary to make a list before you spend money. Start with the thing you want most. You can also write down how much it costs or how important it is in your life. By doing this，you will see if it is really necessary to buy it. 

Help others. 

How about being more selfless （无私的） and using your pocket money to help others？We all know that there are many people in the world who are in need of our help. Helping others brings out the best in us and is one of the greatest joys（乐事） in our lives. So consider using your pocket money to do something useful and helpful，and feel how you can make a difference

Save as much as you can. 

There is an old saying that"Money doesn't grow on trees. "If you spend all your pocket money right away，you'll have no money until your next"pay day". A wallet sometimes might not be the best place to save money because it may make it easier for you to spend your money. Get a piggy bank （储蓄罐） or ask your parents to start a savings account （账户） for you. Someday when you look back，you'll get a strong feeling of achievement by saving so much money by yourself!

Dear Lin Tao，

I am writing to you in English. I hope you can understand（懂）it. 

I love studying in London and I have many new friends. Most of them are my classmates. From Monday to Friday，we have English，math，physics and P. E. in the morning. I like English and physics，because they're interesting. I don't like math. It's too boring. At noon，I have to have lunch at school because my home is far from（远离）my school. We usually have two classes in the afternoon﹣art and politics. We finish our classes at 3 ：30 p. m. After school，my friends and I always play football on the playground. And then we go home by bus. 

On weekends，we have no classes. We often go to the park and sometimes we go to the movies in the evening. We see movies twice a month. I like some famous（著名的）actors like Jackie Chan. 

Oh，I have no time to write more. Please write back soon. 

Best wishes，

Wang Gang