It's a wonderful, warm summer day without a coud in the sky. You're outside, and you can feel the sun's heat on your skin. Do you know what else you are feeling? You're feeling the sun's energy! Without it, the earth would be a cold, dark, lifeless place The sun's radiation(辐射) gives us light and heat energy.

 The Sun's radiation can be harmful to us as well. We can't see it, but ultraviolet(紫外线) radiation comes from the sun along with heat and light. You can not see ultraviolet radiation, but it influences our health. Ultraviolet radiation is what burns our skin.

 Ultraviolet radiation has three parts: ultraviolet radiation A, ultraviolet radialion B, and ultraviolet radialion C. Waves of ultraviolet radiation  A and B may cause harm to our body when we get sunburned. The harm to our body can give us skin cancer(皮肤癌) and cause other health problems.

 You can help to protect yourself from ultraviolet radiation by wearing sunscreen(防晒霜), sunglasses and hats.

 Try to stay out of the sun when it is especially strong .You can find out ultraviolet radiation levels by watching the weather report on television.

    Music has always been an important part of Chinese people's life. People enjoy listening to music at home and in concerts halls. As time goes by， music changes.

    Traditional music is part of our culture， so it often stays with us for a long time. Many of the traditional Chinese songs have been around for many years. Young musicians learn songs from older musicians and the music changes only very little. Modern Chinese music， which is loved by many young people， however， is mainly pop music. That means the songs will be popular for a short time and then replaced by new songs. Today's musicians write new songs every year and we hear new songs on the radio every day.

    Before radio and TV were invented， music could only be heard live — that is you had to go places where musicians gave performances. The best musicians were very busy， so it was difficult and often expensive to hear really good music. For most people， the best chance to hear good music was during a festival or at a wedding. Today， people hear music all the time. Radio and TV play songs every day and night and you can even hear music played on the street.

    One thing that hasn't changed very much is what the songs are about. Both modern and traditional Chinese songs are about love and life. Some songs tell stories about past and some are about the news or the future. All of the songs have something to do with what it means to be a human being.

    Music， traditional or modern， Chinese or international， seems to be a world language that everybody can understand and enjoy. Music changes and styles come and go， but nothing changes our love for good music.

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    Mr Smith works in a big city. Mrs Smith lives in a small town（镇）。Bill 是他们的儿子。 He is with his mother.

    It's a Monday morning.Mrs Smith writes a litter（信） to Mr Smith.She says to Bill,"Go to the post office(邮局)with the letter and your father can get it on Friday. "Then Bill comes back  late(回来晚).

    "Why do you come back late?"

    "There is a new post office in South Street（南街）.Do you know that?"

    "Of course. It's far from our home. Why?"

    "The letter is in the post office. "

    "But there is a post office near our home. "

    "I know,but the post office in South Street is near Dad.  He can get the letter earlier(更早地). "

    American schools are quite different from those in China. In America, at the beginning of the term, students must select (挑选) their subjects and teachers first.

    Selecting is very important for your marks in America. So at the first term, don't select too many subjects, or you'll feel very nervous and tired. Then you have to ask for some teaching plans. There is some information about subjects, time arranging, marks and textbooks. At the same time, you must choose the teachers. Different teachers have different teaching methods. If the teacher is called "killer" by the last grade, many students will give up choosing him, because this kind of teacher will leave too much homework, too many exams and give too low grades. There is another thing after you select the subjects and teachers. How to buy textbooks makes each student feel hard. The textbooks in America are very expensive. Each one is about $30—50. In order to save money, many students buy some used textbooks, and some students usually borrow textbooks from the school library.

    In class, discussing is very important. The teacher encourages you to ask questions or show your own opinions. They don't usually ask you to sit well. Instead they allow you to sit or stand anywhere you like.

    Nowadays, reading is becoming more and more important, so teachers always encourage(鼓励)their students to read more famous work like The Little Prince, Charlotte's Web and The Miraculous Journey of Edward Tulane and so on .

    Among them, the students like Charlotte's Web best. It's written by American author E.B. White .The novel tells a story of a pig named Wilbur and his friendship with a spider named Charlotte on a farm. When Wilbur is in danger of being killed for his meat by the farmer, Charlotte writes a message to praise（表扬） Wilbur in her web and saves him. Wilbur becomes famous in the village and he is safe in the end. When it came out in 1952, the book was welcomed by adults and children. And it's still very popular today.