Millions of people are using cellph

Millions of people are using cellphones today. In many places, it is actually considered unusual not to use one. In many countries, cellphones 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 explosion in mobile phone use around the world has made 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, medical studies have shown 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 equipment. In one case, a traveling salesman had to retire at 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.
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1. According to the passage, cellphones are especially popular with young people because ______.
A. they are indispensable in everyday communications
B. they make them look more stylish
C. they keep the users alert all the time
D. they cannot be replaced by regular phones
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2. The changes possibly caused by the cellphones are mainly concerned with ______.
A. the mobility of the mind and the body
B. the smallest units of the brain
C. the arteries of the brain
D. the resident memory
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3. “Negative publicity" in the passage most likely means ______.
A. widespread opinion about bad effects of cellphones
B. information on the lethal effects of cellphones
C. the negative public use of cellphones
D. poor ideas about the effects of cellphones
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4. Doctors have tentatively concluded that cellphones may ________.
A. damage their users’ emotions

B. change their users’ social behaviours
C. change their users’ temperament
D. cause some mental malfunction
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5. According to the writer, people should ______.
A. only use mobile phones in urgent cases
B. only use mobile phones in medical emergencies
C. keep off mobile phones regularly
D. never use mobile phones in all cases
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6. The most suitable title for the passage could be ______.
A. “The Reasons Why Mobile Phones Are Popular”
B. “Technological Innovations and Their Price”
C. “The Way Mobile Phones Work”
D. “Mobile Phones: A Must of Our Time”