What is it that makes mobile phones potentially harmful？The answer is radiation.High­tech 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 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 warning label that says they are bad for your health.So for now，it’s wise not to use your mobile phone too often.

　　1．People buy cell phones for the following reasons except that________.

　　A．they’re popularB．they’re convenient

　　C．they’re useful

　　D．they’re cheap

　　2．The word “detected” in Paragraph 3 could be best replaced by________.

　　A．discovered

　　B．removed

　　C．cured

　　D．caused

　　3．The salesman retired young because________.

　　A．he disliked using mobile phones

　　B．he couldn’t remember simple tasks

　　C．he was tired of talking on his mobile phone

　　D．his employer’s doctor persuaded him to

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