According to the passage, what makes mobile phones potentially harmful is .
A. their radiant light
B. their power of attraction
C. their raiding power
D. their invisible rays
Giải bởi qa.haylamdo.com
Đáp án đúng là: D
Giải thích:
Dựa vào câu: What is it that makes mobile phones potentially harmful? The answer is radiation.
Dịch: Điều gì khiến điện thoại di động có khả năng gây hại? Câu trả lời là bức xạ.
Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in each of the following questions.
Checking for mould and mildew is first thing one can do in a green campaign.
My aunts excitedly a compliment on the scarf I knitted for her as a birthday present.
The customs (A) in his country (B) are more traditional (C) than that (D) in the United States.
To save water, take shorter (A) showers to reduce (B) water use. This will raise (C) your water and heating bills, too (D).
Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.
Without action, the impacts of climate change threaten to catastrophically damage our world.
Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35.
Over the last twenty years, security cameras (31) become a part of daily life. They are in elevators, parking garages, even on the streets. Of course, a security camera is only useful if there is a guard (32) it, and there are definitely more cameras in our world than there are guards. That is why many of the security cameras you see are not actually (33) . They look like cameras, but they do not actually work. They are only there to make people think that they are being watched. Since (34) don’t know which cameras are real and which one are not, the fake cameras work as well as the real (35) .
Over the last twenty years, security cameras (31 ) become a part of daily life.
Richard shouldn’t have forgotten that yesterday was his wife’s birthday.
Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 43.
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.
According to the passage, cellphones are very popular with young people because .
