dcdanh12345 2/22/2025 8:35:46 AM

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.

Câu 641:

What does the word “They” in paragraph 2 refer to?

        A. doctors                

        B. mobile phone companies

        C. ideas                

        D. mobile phones

Câu 642:

What is mentioned about the man who used his cellphone too often in paragraph 3?

        A. He suffered a serious loss of mental ability.

        B. He could no longer think lucidly.

        C. He abandoned his family.

        D. He had a problem with memory.

Câu 643:

What is the word “potentially” in paragraph 4 closest in meaning to?

        A. obviously        B. possibly        C. certainly        D. privately

Câu 644:

Which of the following best paraphrases this sentence: “Phones are more than a means of communication - having a mobile phone shows that they are cool and connected.”?

        A. Phones are no longer important for communication but are a fashion statement for everyone.

        B. Phones are only used for communication, but mobile phones are cool and modern.

        C. Phones are not just for talking; owning one also proves their trendiness and connectedness.

        D. Having a phone is more important than staying connected or communicating with others.

Câu 645:

Which of the following does the author probably support?

        A. People had better use mobile phones only when necessary to minimize potential health risks.

        B. Mobile phones should be banned entirely because they are extremely dangerous.

        C. Mobile phones are safe and can be used as often as you want without any consequences.

D. The use of regular phones should be avoided, and mobile phones should always be prioritized for long conversations.

 

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