单选题
Cell Phones: Hang Up or Keep Talking?

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 professional 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 serous 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 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 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 useful
  • C. they're cheap
  • D. they're convenient
【正确答案】 C
【答案解析】[解析] 根据第一段内容可知，如今成千上万的人使用手机，如果没有手机被看做是不正常的，在很多国家手机在年轻人中很受欢迎，因为手机比较方便联系，并没有提到手机便宜，所以答案为C。
单选题 The world "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] 根据第三段“Signs of change in the issues of the brain and head can be detected with modern scanning(扫描)equipment.”可知，脑部和头部组织的变化特征可用现代扫描设备观察。四个选项：cure“治愈”；remove“移除”；discover“发现”；cause“引起”。
单选题 The salesman retired young because ______.
  • A. he disliked using mobile phones
  • B. he was tired of talking on his mobile phone
  • C. his employer's doctor persuaded him to
  • D. he couldn't remember simple tasks
【正确答案】 D
【答案解析】[解析] 根据第三段“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.”可知，一名销售人员不得不在年轻的时候退休，因为他甚至记不住简单的任务，所以答案为D。
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] 根据第四段最后一句话“Mobile phone companies agree that there is some radiation, but they say the amount is too small to worry about.”可知，手机公司认为存在一些辐射，但辐射量很小，不用为此担心，所以答案为D。
单选题 The writer's purpose of writing this article is to advise people ______.
  • A. to buy mobile phones
  • B. to use mobile phones less often
  • C. to update regular phones
  • D. to stop using mobile phones
【正确答案】 B
【答案解析】[解析] 根据最后一段最有一句话“So for now it's wise not to use your mobile phone too often．”可知，到目前为止，尽量少使用手机是明智的，所以答案为B。