Radar（雷达） is an electronic device that detects planes, ships, coastlines, landmarks, and even storm clouds. The name radar comes from the first letters of the words radio direction and ranging. As the human eye uses light waves to see, radar “sees” with radio waves. Without radar, planes could not land safely in bad weather and ships could not move safely in thick fog{#blank#}1{#/blank#}

    In the 1800s it was discovered that radio waves could be reflected from objects. But scientists did not make great advances in radar research until the 1930s, when the world was threatened by war{#blank#}2{#/blank#}It has been used widely in almost every conflict since then.

    Echoes make it possible for radar to work. When a beam of radio waves is sent out, it strikes on an object and returns an echo. This echo is picked up by radar and recorded on a screen similar to television screen. On the screen an observer sees a flash, or a blip, that shows the direction and distance of the object{#blank#}3{#/blank#}

    Airport control towers use radar to guide planes in for safe landings. Almost all large ships depend on radar to prevent collisions with icebergs or other ships{#blank#}4{#/blank#}Weather forecasters “see” the size, direction, and speed of storms on radar screens. Astronomers can even use radar to measure accurately the distance to the moon. Thus, the device has generated major advancements.

    {#blank#}5{#/blank#} Huge radar antennas have been installed all over the United States. They guard us against possible enemy attacks. We have ballistic—missiles (战略导弹)warning systems that can alert us to attacks when missiles are more than 1,000 miles away. Other radar systems warn us against enemy aircraft and even spying space satellites.

A. Police track speeders in radar-equipped cars.

B. These measurements are now highly accurate.

C. The device can be used in a wide range of fields.

D. During World War II many countries used radar effectively.

E. It is therefore especially valuable to shippers and travelers.

F. Today radar is used by commercial airliners and weather forecasters.

G. Strengthening national defense is one of radar's most important functions.

    Grown-ups are often surprised by how well they remember something they learned as children but have never practiced ever since. A man who has not had a chance to go swimming for years can still swim as well as ever when he gets back in the water. He can get on a bicycle after many years and still ride away. He can play catch and hit a ball as well as his son. A mother who has not thought about the words for years can teach her daughter the poem that begins “Twinkle, twinkle, little star” or remember the story of Cinderella or Goldilocks and the Three Bears.

    One explanation is the law of overlearning, which can be stated as follows: Once we have learned something, additional learning trials will help strengthen the related knowledge and skills.

    In childhood we usually continue to practice such skills as swimming, bicycle riding, and playing baseball long after we have learned them. We continue to listen to and remind ourselves of words such as “Twinkle, twinkle, little star” and childhood tales such as Cinderella and Goldilocks. We not only learn but overlearn.

    The multiplication tables (乘法口诀表) are also an exception to the general rule that we forget rather quickly the things that we learn in school, because they are another of the things we overlearn in childhood.

    The law of overlearning explains why cramming for an examination, though it may result in a passing grade, is not a satisfactory way to learn a college course. By cramming, a student may learn the subject well enough to get by on the examination, but he is likely soon to forget almost everything he learned. A little overlearning, on the other hand, is really necessary for one's future development.

    The past ages of man have all been carefully labeled by anthropologists (人类学家). Descriptions like "Palaeolithic (旧石器时代的) Man". "Neolithic (新石器时代的) Man",etc. neatly sum up whole periods. When the time comes for anthropologists to turn their attention to the twentieth century, they will surely choose the label "Legless Man". Histories of the time will go something like this: "in the twentieth century, people forgot how to use their legs. Men and women moved about in cars, buses and trains from a very early age. There were lifts in all large buildings to prevent people from walking. And the surprising thing is that they didn't use their legs even when they went on holiday."

    The future history books might also record that we were deprived (剥夺) of the use of our eyes. In our hurry to get from one place to another, we failed to see anything on the way. Air travel gives you a bird's-eye view of the world. When you travel by car or train, an unclear picture of the countryside constantly smears the windows. Car drivers, especially, are mixed with the urge to go on and on: they never want to stop. The typical twentieth-century traveler is the man who always says "I've been there." You mention the remotest, and someone is bound to say "I've been there"-meaning, "I drove through it at100 miles an hour on the way to somewhere else."

    When you travel at high speeds, the present means nothing: you live mainly in the future because you spend most of your time looking forward to arriving at some other place. But actual arrival, when it is achieved, is meaningless. You want to move on again. By traveling like this, you suspend all experience. The traveler on foot, on the other hand, lives constantly in the present. For him traveling and arriving are one and the same thing: he arrives somewhere with every step he makes. He experiences the present moment with his eyes, his ears and the whole of his body. At the end of his journey he feels a delicious physical tiredness. He knows that sound, satisfying sleep will be his: the just reward of all true travelers.

    "I didn't hear them call my name." explained Shelley Hennig to Active Teens (AT) when she talked about that exciting moment on national television when she won the honor of Miss Teen USA 2004. "Are you ready?" is what she heard. Then she said, "I shook my head no, and then they said 'yes' and it was announced again."

    It was four days after that life changing moment for the seventeen-year-old high school student from Destrehan, Louisiana—she was still on cloud nine.

    "I was so shocked! I never believed that it could actually really happen." Present in the audience that day were: her mother and father, older brother, her friends, and her dance teacher.

    AT asked why her dance teacher had traveled so far to see her compete. "She's always been my role model. I've danced with her since I was six. She's been through so many difficulties and came through them all. I've learned to get over bad life's experiences and learned how to move on because of her." One of those bad life's experiences for Shelley happened three years ago when her brother Brad was killed in a drunk driving accident. He was 18.

    As Miss Louisiana Teen, she traveled around the state speaking to teens about the dangers of drinking and driving. In her role as Miss Teen USA, Shelley will continue to speak to youth about safe driving, together with many other things to help the teenagers.

    When AT asked Miss Teen USA if she had any advice for our readers, she said, "Don't let anyone change you. Hang out with people that make you feel good about yourself. That way, it is easy to be yourself."

How Do People Plan Their Life?

    The story of King Midas is not true. No man could really touch the things around him and make them turn to gold. It could be wonderful if we could turn things into gold as in the story. But the "magic touch" the life without work is seldom part of life in an everyday world.

    It costs money to do the things you want to do and to buy the things you want to buy. In order to give a present for a birthday you must first earn the money before you have any to spend. Your home your food and your clothes are basic needs. Everyone needs these three things. Many other things we want are really luxuries. Basic needs and luxuries together form our standard(标准)of living. Many of the things we feel we "need" in our homes would be regarded as luxuries to other people in other parts of the world.

    Have you ever helped plan a family budget(预算)?If you know you have to balance the whole money the family have earned you should pay for gas electricity water and your house. You should also plan for holidays and other special uses. At the same time you should have some of your money to be saved.

    How people earn their money and how they spend their money is an important aspect of the study of economics.

Scholastic Art & Writing Awards

The Scholastic Art & Writing Awards are among the most famous awards for student achievement in the literary and visual arts. Past winners include such short story masters as Donald Barthelme, Joyce Carol Oates, and Stephen King.

The contest offers several categories relevant to short story writers: short story, flash fiction, science fiction, humor, and writing collection (graduating seniors only).

Who can enter? The contest is open to students in grades 9 to 12 (including homeschool-ers) in the US, Canada, or American schools abroad.

What do winners receive? The contest offers a variety of scholarships (some as high as $ 10,000) and cash awards (some as high as $ 1,000) at both the regional level and he national level. Winners may also receive certificates of recognition and opportunities for publication.

How are entries judged? The awards have three judging standards: originality, technical skill, and the reflection of a personal vision or voice. Be sure to read past winners to get an idea of what's been successful. The judges change every year, but they always include people who are highly accomplished in their field.

When is the deadline? Competition guidelines are updated in September, and submissions are usually accepted from September through early January. Regional Gold Key winners will automatically advance to the national competition.

How do I enter? All students begin by entering a regional competition based on their ZIP code. See the guidelines for additional information.