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 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-techma-chines 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

单选题 The word"detected'in paragraph 3 could be best replaced by

单选题 The salesman retired young because

【正确答案】 D

【答案解析】[解析] 根据文中第3段第4行：“一个很年轻的流动推销员因为严重的失忆而不得不退休。四个选项中A项he dislikes using mobile phones．他不喜欢用手机；B项he was tired of talking on his mobile phone．他厌倦用手机说话；C项his employer’s doctor persuaded him tO．他的雇主医生劝他退休；D项Hecouldn’t remember simple tasks．他不能记住简单的工作。很明显四个选项中D项符合原文内容，据此判断应选D项。

单选题 On the safety issue of mobile phones, the manufacturing companies

【正确答案】 D

【答案解析】[解析] 根据文中第4段的最后1句：“手机公司认为确实有些辐射，但他们说辐射量很小无需担忧。”A项deny the existence of mobile phone radiation：否认存在手机辐射；B项develop new technology to reduce mobile phone radiation．开发新技术来减少手机辐射；C项try to prove that mobile phones are not harmful to health．设法证明手机对健康无害；D项hold that the amount of radiation is too small to worry about．很明显可以看出D项符合原文内容，因此选D。