Millions of people are using cellphones today

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 connecte
d. The explosion in mobile phone use around the world has made some health professionals worrie
d. 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.
câu. 1: The word “they” in paragraph 2 refers to _______.
A. doctors
B. ideas
C. professionals
D. companies
câu. 2: The phrase “negative publicity” in paragraph 2 most likely means _______.
A. poor ideas about the effects of cellphones
B. information on the lethal effects of cellphones
C. the negative public use of cellphones
D. widespread opinion about bad effect of cellphones
câu. 3: According to the passage, cellphones are very popular with young people because _______.
A. they make them look more stylish
B. they are worrying
C. they are a means of communication
D. they are considered unusual
câu. 4: What could be the most suitable title for the passage?
A. Technological Innovations and Their Price
B. The Way Mobile Phones Work
C. Mobile Phones: A Must of Our Time
D. The Reasons Why Mobile Phones Are Popular
câu. 5: The word “potentially” in paragraph 4 is closet in meaning to _______.
A. possibly
B. privately
C. obviously
D. certainly
câu. 6: According to the passage, people should _______.
A. only use mobile phones in medical emergencies
B. never use mobile phones in all cases
C. only use mobile phone in urgent cases
D. keep off mobile phones regularly
câu. 7: According to paragraph 3, the salesman _______.
A. couldn’t remember his name
B. blamed his doctor
C. had a problem with memory
D. had to retire because of his age