题目内容：
根据下面资料，回答题 Cell Phones:Hang Up or Keep Talking?
Millions of people are using cell phones today. In many places it is actually considered 41 (usual) not to use one. They find that the phones are more than a means of 42 (communicate)--having a mobile phone shows that they are cool and 43 (connect).
The 44 (explode) around the world in mobile phone use make some health professionalworried. Some doctors are 45 (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 46 (public) of such ideas. They say thatthere is no 47 (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 48 (detect)with modern scanning equipment. What is it that makes mobile phones 49 (potential) harmful?The answer is radiation.
As the discussion about their safety continues,it appears that it' s best to use mobile phones lessoften. Use your regular phone if you want to talk for a long time. Use your mobile phone only whenyou really need it. Mobile phones can be very useful and convenient, especially in emergencies. Inthe future, mobile phones may have a 50 (warn) label that says they are bad for your health. Sofor now,it' s wise not to use your mobile phone too often.
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