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  3. Cell Phones: Hang Up or Keep Talking? Millions of people are using cell phones today. In many places it is actually consider

Cell Phones: Hang Up or Keep Talking? Millions of people are using cell phones today. In many places it is actually consider

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问题     Cell Phones: Hang Up or Keep Talking?
    Millions of people are using cell phones today. In many places it is actually considered【C1】______(usual) not to use one. They find that the phones are more than a means of【C2】______(communicate)—having a mobile phone shows that they are cool and【C3】______(connect).
    The【C4】______(explode) around the world in mobile phone use make some health professional worried. Some doctors are 【C5】______(concern) that in the future many people may suffer health problems from the use of mobile phones. In England, there has been a serious debate about this issue. Mobile phone companies are worried about the negative【C6】______(public) of such ideas. They say that there is no【C7】______(prove) that mobile phones are bad for your health.
    On the other hand, signs of change in the issues of the brain and head can be【C8】______(detect) with modern scanning equipment. What is it that makes mobile phones【C9】______(potential) harmful? The answer is radiation.
    As the discussion about their safety continues, it appears that it’s best to use mobile phones less often. Use your regular phone if you want to talk for a long time. Use your mobile phone only when you really need it. Mobile phones can be very useful and convenient, especially in emergencies. In the future, mobile phones may have a【C10】______(warn) label that says they are bad for your health. So for now, it’s wise not to use your mobile phone too often.
【C5】
选项
答案concerned
解析 本句空白处放在be动词are后面显然需要提示词动词concern作出相应改变。因此，将提示词concern改成形容词concerned放在句中，意为“对某事担心”。
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