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 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 travelling 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

Doctors have tentatively concluded that cell phones may .............

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• Pollution in water is noticed .............

• The title for this passage could be .............

• According to the writer, students’ difficulties to cope with college life are partly due to ____________.

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• Which of the following is NOT true?

• The word “accounts” is closest in meaning to ...........

• How do theorists believe a person can remember more information in a short time?

• If you visit an American friend at home in the evening, you may find that your friend wears .............

• The author mentions that all of the following are aware of quantities in some ways EXCEPT ............

• The word "misinterpret" is closest in meaning to ............

• The story about college life in Amerian movies are not ...............

• The author mentions all the following as examples of the behavior of desert animals EXCEPT ..........

• Which of the following properties is NOT mentioned as protected by copyright?

• Extreme weather can be caused by ...............

• If you are in a foreign country, the best way the writer suggests to you is to wear .........

• The word “bizarre” is closest meaning to ..........

• The author uses the word “But” in paragraph 4 to ______.

• According to the passage, the highest amount of pheromone vapor is found ........

• What is the zone of volcanoes and seismic activity in the world called?

• The main idea of this passage is that .................

• Who is intended to benefit from the advice given in the article?