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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.
【C7】
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解析 本句空白处放在there be句型之后显然需要填入名词，因此将提示词动词prove改成符合语境的名词proof(证明，证据)即可。
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