阅读理解。

     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 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.

1. The world "detected" in paragraph 3 could be best replaced by _____.

A. discovered

B. removed

C. cured

D. caused

2. The salesman retired young because _____.

A. he disliked using mobile hones

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

3. 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. hold that the amount of radiation is too small to worry about

D. try to prove that mobile phones are not harmful to health