What is it that makes mobile phones potentially harmful? The answer is radiation. High-tech machines can detect very small amounts of radiation from mobile phones. Mobile phone companies agree that there is some radiation, but they say the amount is too small to worry about.
As the discussion about their safety continues, it appears that its 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 warning label that says they are bad for your health. So for now, its wise not to use your mobile phone too often
31 People buy cell phones for the following reasons EXCEPT that
A theyre popular
B theyre useful
C theyre convenient
D theyre cheap
32 The world detected in paragraph 3 could be best replaced by
A cured
B removed
C discovered
D caused
33 The salesman retired young because
A he couldnt remember simple tasks
B he disliked using mobile phones
C he was tired of talking on his mobile phone
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