WARNING(警告): Holding a cell phone against your ear or putting it in your pocket may be bad for your health. This sentence is a warning that you'd better not put it close to you when a new phone is bought. Apple company, for example, doesn't want iPhones to come closer to you than 1.5 centimeters; Research In Motion, BlackBerry's producer, recommends 2.5 centimeters.

      If cell phone use can cause health problems, the result will be very serious. Americans spend 2.26 trillion minutes chatting on cell phones every year, which brings $109 billion for the wireless businessmen.

      Devra Davis, an epidemiologist(皮肤病专家)who has worked for the University of Pittsburgh, has published a book about mobile phone radiation(辐射)"Disconnect." Davis studies how often brain cancer happens during different age groups. As a result of mobile phone radiation, she finds that a big increase(增长)in brain cancer in the 20-to-29 age group and a drop for the older people.

      Children are more easily hurt by radiation than grown-ups, Ms. Davis and other scientists point out. But no studies have yet been finished on cell phone radiation and children, she says.

      Henry Lai, a research professor, began lab radiation studies in 1980 and found that mice exposed to(暴露在) radiofrequency（电波频率）radiation had destroyed DNA in their brains.

      Ms. Davis recommends using wired earphones（有线耳机）or the phone's speaker. Children should send text messages rather than call, she said, and pregnant women should keep phones away from their bodies.

    Maybe you are an average(普通的) student. {#blank#}1{#/blank#} However, this is not necessarily so. Anyone can become a better student if he or she wants to. Here's how.

    Plan your time carefully. When planning your work, you should make a list of things that you have to do. After making this list, you should make a schedule of your time. First your time for eating, sleeping, dressing, ect. {#blank#}2{#/blank#} Don't forget to set aside enough time for entertainment (娱乐). A weekly schedule may not solve all your problems but it will force you to realize what is happening to your time.

    Find a good place to study. Look around the house for a good study area. Keep this place which may be a desk or simply a corner of your room, free of everything but study materials. No games, radios, or television. When you sit down to study, concentrate on the subject.

    Make good use of your time in class. {#blank#}3{#/blank#} Listening carefully in class means less work later. Taking notes will help you remember what the teacher says.

    Study regularly(有规律地). When you get home from school, go over your notes, review the important points that your teacher mentioned in class. If you know what your teacher is going to discuss the next day, read that material. {#blank#}4{#/blank#} If you do these things regularly, the material will become more meaningful, and you'll remember it longer.

    Develop a good attitude (态度) towards tests. The purpose of a test is to show what you have learned about a subject. Then help you remember your new knowledge. The world won't end if you don't pass a test, so don't be over worried.

    {#blank#}5{#/blank#} You will probably discover many others after you have tried these.

A. There are other methods that might help you with your studying.

B. Then decide a good, regular time for studying.

C. Take advantage of class time to listen to everything the teacher says.

D. No one can become a top student unless he or she works hard.

E. You probably think you will never be a top student.

F. Make full use of class time to take notes of what the teacher says in class.

G. This will help you understand the next class.

    Why should students play sports? Some people think that students play sports in order to get exercise. Others think it can help students have fun. But that is not enough. If students play sports, they can get more than healthy bodies. Why? Here are three more reasons.

    Students who play sports do better in school. Some people think that doing exercise will take up student's study time. But a recent study has shown that student who play sports get better scores in school than those who don't. Exercise gets students to learn, remember things and concentrate better.

    Students who play sports develop their teamwork spirit and learn problem solving skills. When they are working together with other to win games and reach goals, they're learning how to be successful in practice. And these skills will be useful to them for study or their future work.

    Playing sports can also improve confidence. Students who play sport feel better about themselves. When they know they can improve and reach their goals by practicing, it builds their confidence. And sports can also help them communicate with others actively and make new friends.

    Now, how about going out to play sports with your friends every day?

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