单选题 Millions of people are using cell phones today. In many places it is actually considered unusual not to use one. In many countries, cell phones are very popular with young people. They find that the phones are more than a means of communication—having a mobile phone shows that they are cool and connected.
The explosions around the world in mobile phone use make some health professionals worried. Some doctors are concerned 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 publicity of such ideas. They say that there is no proof that mobile phones are bad for your health.
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 tissues 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 couldn't 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 employer's doctor didn't 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 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.
单选题 People buy cell phones for the following reasons EXCEPT that ______.
  • A. they're popular
  • B. they're cheap
  • C. they're useful
  • D. they're convenient
【正确答案】 B
【答案解析】[解析] “人们购买手机不是为了以下哪个原因。”文章第一段，许多国家年轻人中使用手机非常流行。他们认为手机不仅仅是通信的工具，而且拥有手机表明自己的酷和入时。最后一段说，手机非常有用而且方便。
单选题 The word "detected" in Paragraph 3 could be best replaced by ______.
  • A. cured
  • B. removed
  • C. discovered
  • D. caused
【正确答案】 C
【答案解析】[解析] detect：发现；查明。discover：发现。
单选题 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
【正确答案】 B
【答案解析】[解析] “销售人员很早退休是因为……”文章第三段中提到：销售员提早退休是因为记忆力衰退，他甚至不能记住一些简单的任务。
单选题 On the safety issue of mobile phones, the manufacturing companies ______.
  • A. deny the existence of mobile phone radiation
  • B. develop new technology to reduce mobile phone radiation
  • C. try to prove that mobile phones are not harmful to health
  • D. hold that the amount of radiation is too small to worry about
【正确答案】 D
【答案解析】[解析] “关于手机安全的问题，生产公司……”文章第四段提到：他们认为辐射量很少，不用担心。
单选题 The writer's purpose of writing this article is to advise people ______.
  • A. to use mobile phones less often
  • B. to buy mobile phones
  • C. to update regular phones
  • D. to stop using mobile phones
【正确答案】 A
【答案解析】[解析] “作者写这篇文章的目的是建议人们……”文章最后一句：因此，从现在起，不频繁使用手机是明智的。