On the other hand, why do some medical studies show changes in the brain cells of some people who use mobile phones? Signs of change in the issues of the brain and head can be detected with modern scanning (扫描) equipment. In one case, a traveling salesman had to retire at a young age because of serious memory loss. He couldnt remember even simple tasks. He would often forget the name of his own son. This man used to talk on his mobile phone for about six hours a day, every day of his working week, for a couple of years. His family doctor blamed his mobile phone use, but his employers doctor didnt agree.

　　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

【职称英语2011真题：理工类B级真题阅读理解】相关文章：

★ 2007职称英语题库理工类A级：阅读理解

★ 职称英语2011真题：理工类B级真题补全短文

★ 2009职称英语真题理工类B级真题：词汇选项

★ 2008职称英语题库理工类A级：参考答案

★ 2009职称英语真题理工类B级真题：阅读理解

★ 职称英语真题理工2006年B类：参考答案

★ 2005职称英语考试理工类B级真题及答案

★ 职称英语2011真题：理工类B级真题完形填空

★ 2010年职称英语考试真题理工类A级：阅读理解

★ 2012年职称英语考试《理工类A级》考试真题答案