Đề kiểm tra chất lượng ôn thi THPT Quốc gia môn Tiếng Anh Lớp 12 - Năm học 2017-2018 - Đề số 351

 SỞ GD&ĐT VĨNH PHÚC
TRƯỜNG THPT LIỄN SƠN
(Đề thi gồm: 05 trang)
ĐỀ KTCL ÔN THI THPT QUỐC GIA NĂM 2017-2018
Môn: TIẾNG ANH – ĐỀ SỐ 351
Thời gian làm bài: 60 phút, không kể thời gian phát đề
Họ và tên thí sinh:. SBD:
Ø 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.
Question 01: A. wanted	B. stopped	C. decided	D. hated
Question 02: A. epidemic	B. illegal	C. education	D. competitor
Ø 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.
Question 03: A. offer	B. canoe	C. country	D. standard
Question 04: A. struggle	B. anxious	C. confide	D. comfort
Ø Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.
Question 05: All the candidate for the scholarship will be equally treated regarding of their age, sex, or nationality.
A. candidate 	B. scholarship 	C. regarding 	D. nationality
Question 06: Reminding not to miss the 15:20 train, the manager set out for the station in a hurry.
A. Reminding 	B. the 15:20 train	C. for 	D. in a hurry
Question 07: Because of bad weather conditions, it took the explorers three days reaching their destination.
A. Because 	B. weather conditions	C. the explorers 	D. reaching 
Ø Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Question 08: Armed terrorists are reported to have________ the embassy.
	A. taken up	B. taken to	C. taken over	D. taken after
Question 09: After reading the letter, ________ it on the table.
	A. leaving	B. and leaving	C. she left	D. and she left
Question 10: There is________ in my bed room.
	A. an old square wooden table	B. a square wooden old table
	C. a square old wooden table	D. an old wooden square table
Question 11: The boy________ went to the hospital to ask for doctor’s help.
	A. whose sick sister	B. whose sister sicked
	C. who his sister is sick	D. whose sister was sick
Question 12: ________ the phone rang later that night did Tom remember the appointment.
	A. No sooner	B. Only	C. Not until	D. Just before
Question 13: ________ of all the staff, I would like to wish you a happy retirement.
	A. Instead	B. In place	C. On behalf	D. On account
Question 14: ________ is the existence of a large number of different kinds of animals and plants which make a balanced environment.
	A. extinction	B. biodiversity	C. habitat	D. conservation
Question 15: I can’t imagine________ anywhere except here.
	A. studying	B. to study	C. study	D. that I study
Question 16: He managed to keep his job________ the manager had threatened to sack him.
	A. therefore	B. although	C. unless	D. despite
Question 17: The government made serious attempts to raise the________ of living.
	A. standard	B. cost	C. level	D. mode
Question 18: If you run________ Steve, give him my best wishes.
	A. over	B. up	C. into	D. to
Question 19: The doctor has advised________ less coffee.
	A. me drink	B. me to drink	C. me drinking	D. I will drink
Ø Mark the letter A, B, C or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.
Question 20:	- Hung: “Thank you very much for a lovely party”.	- Hoa: “_____________”
	A. Cheers	B. Have a good day	C. Thanks.	D. You are welcome
Question 21:	- Peter: My father’s much better now.	- Tom: “_____________”
	A. Oh, I’m pleased to hear it.	B. Oh, really? The doctor must be very good
	C. Good news for you.	D. Wonderful. Congratulations!
Ø Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.
Question 22: Today’s scientists have overcome many of the challenges of the depth by using more sophisticated tools.
	A. complicated	B. wordly	C. experienced	D. aware
Question 23: Experts often forecast an upswing in an economy after a protracted slowdown.
	A. a decline	B. an improvement	C. inflation	D. a reform
Ø 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.
Question 24: “That is a well-behaved boy whose behaviour has nothing to complain about”
	A. good behavior	B. behaving improperly	C. behaving nice	D. behaving cleverly
Question 25: After five days on trial, the court found him innocent of the crime and he was released.
	A. benevolent	B. innovative	C. naive	D. guilty
Ø Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is CLOSEST in meaning to each of the following questions.
Question 26: Do you see the smoke? It comes from the hills.
	A. Do you see the smoke which comes from the hills?
	B. Do you see the smole came from the hills?
	C. Do you see the smoke is coming from the hills?
	D. Do you see the smoke which it comes from the hills?
Question 27: “Don’t be so disappointed Jane. You can take the driving test again,” said Helen.
	A. Helen told Jane not to be disappointed and take the driving test again.
	B. Helen asked Jane not to be disappointed and offered her another driving test.
	C. Helen warned Jane not to be disappointed in order to take the driving test again.
	D. Helen encouraged Jane to take the driving test again.
Question 28: It’s hard to concentrate when you are tired.
	A. The more tired you are, it’s harder to concentrate.
	B. When you are tired, the harder it is to concentrate.
	C. The most tired you are, the hardest it is to concentrate.
	D. The more tired you are, the harder it is to concentrate.
Ø Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
Question 29: The coffee was not strong. It didn’t keep us awake.
	A. The coffee was very strong, but it couldn’t keep us awake.
	B. We were kept awake because the coffee was strong.
	C. The coffee was not strong enough to keep us awake.
	D. The coffee was so hot that it didn’t keep us awake.
Question 30: You don’t try to work hard. You will fail in the exam.
	A. Unless you don’t try to work hard, you will fail in the exam.
	B. Unless you try to work hard, you won’t fail in the exam.
	C. Unless you try to work hard, you will fail in the exam.
	D. Unless do you try to work hard, you will fail in the exam.
Ø 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.
THE DANGERS OF DIETING
Thanks to our moden lifestyle, with more and more time spent sitting down in front of computers than ever before, the (31)________ of overweight people is at a new high. As people frantically search for a solution (32)________ this problem, they often try some of the popular fad diets being offered. Many people sea fad diets (33)________ harmless ways of losing weight, and they are grateful to have them. Unfortunately, not only don’t fad diets usually (34) ________ weight. While the reckless use of fad diets can bring some initial results, long-term results are very rare.
Question 31: A. number	B. range	C. amount	D. sum
Question 32: A. on	B. of	C. to	D. with
Question 33: A. by	B. like	C. through	D. as
Question 34: A. bring	B. do	C. take	D. play
Question 35: A. lose	B. gain	C. put	D. reduce
Ø 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 42.
A recent survey of crime statistics shows that we are all more likely to be burgled now than 20 years ago and the police advise everyone to take a few simple precautions to protect their homes.
The first fact is that burglars and other intruders prefer easy opportunities, like a house which is very obviously empty. This is much less of a challenge than an occupied house, and one which is well-protected. A burglar will wonder if it is worth the bother.
There are some generalt ips on how to avoid your home becoming another crime statistic. Avoid leaving signs that your house is empty. When you have to go out, leave at least one light on as well as a radio or television, and do not leave any curtains wide open. The sight of your latest music centre or computer is enough to tempt any burglar.
Never leave a spare key in convenient hiding place. The first place a burglar will look is under the doormat or in a flower pot and even somewhere more ‘imaginative’ could soon be uncovered by the intruder. It is much safer to leave a key with a neighbour you can trust. But if your house is in a quiet, desolate area be aware that this will be a burglar’s dream, so deter any potential criminal from approaching your house by fitting security lights to the outside of your house.
But what could happen if, in spite of the aforementioned precautions, a burglar or intruder has decided to target your home. Windows are usually the first point of entry for many intruders. Downstairs windows provide easy access while upstairs windows can be reached with a ladder or by climbing up the drainpipe. Before going to bed you should double-check that all windows and shutters are locked. No matter how small your windows may be, it is surprising what a narrow gap a determined burglar can manage to get through. For extra security, fit window locks to the inside of the window.
What about entry via doors? Your back door and patio doors, which are easily forced open, should have top quality security locks fitted. Even though this is expensive it will be money well spent. Install a burglar alarm if you can afford it as another line of defence against intruders.
A sobering fact is that not all intruders have to break and enter into a property. Why go to the trouble of breaking in if you can just knock and be invited in? Beware of bogus officials or workmen and, particularly if you are elderly, fit a chain and an eye hole so that you scrutinise callers at your leisure. When you do have callers never let anybody into your home unless you are absolutely sure they are genuine. Ask to see an identity card, for example.
If you are in the frightening position of waking in the middle of the night and think you can hear an intruder, then on no account should you approach the intruder. It is far better to telephone the police and wait for help.
Question 36: A well-protected house ________ .
	A. is less likely to be burgled.	B. is regarded as a challenge by most criminals.
	C. is a lot of bother to maintain.	D. is very unlikely to be burgled.
Question 37: According to the writer, we should ________ .
	A. avoid leaving our house empty.
	B. only go out when we have to.
	C. always keep the curtains closed.
	D. give the impression that our house is occupied when we go out.
Question 38: The writer thinks that hiding a key under a doormat or in a flower pot________
	A. is predictable.	B. is useful.
	C. is imaginative.	D. is where you always find a spare key
Question 39: What word best replaces “desolate” in paragraph 4?
	A. isolated	B. populous	C. dissatisfying	D. depressing
Question 40: Gaining entry to a house through a small window________
	A. is surprisingly difficult.
	B. is not as difficult as people think.
	C. is less likely to happen than gaining entry through a door.
	D. is tried only by very determined burglars.
Question 41: The writer argues that fitting a chain and an eye hole________
	A. will prevent your home being burgled.
	B. avoids you having to invite people into your home.
	C. is only necessary for elderly people.
	D. gives you time to check if the visitor is genuine.
Question 42: The best title for the text is________
	A. Increasing household crime.	B. Protecting your home from intruders.
	C. What to do if a burglar breaks into your home.	D. Burglary statistics
Ø 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 43 to 50.
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.
Question 43. According to the passage, cell phones are especially popular with young people because________
	A. they make them look more stylish.
	B. they keep the users alert all the time.
	C. they cannot be replaced by regular phones.
	D. they are indispensable in everyday communications.
Question 44: The word "means" in the passage most closely means________.
	A. meanings	B. expression	C. transmission	D. method
Question 45: Doctors have tentatively concluded that cell phones may________
	A. cause some mental malfunction	B. change their users' temperament
	C. change their users' social behaviours.	D. damage their users' emotions.
Question 46: The changes possibly caused by the cell phones are mainly concerned with________
	A. the smallest units of the brain.	B. the mobility of the mind and the body.
	C. the resident memory.	D. the arteries of the brain.
Question 47: The man mentioned in the passage, who used his cell phone too often, ________
	A. had a problem with memory.	B. abandoned his family.
	C. suffered serious loss of mental ability.	D. could no longer think lucidly.
Question 48: The word "potentially" in the passage most closely means________.
	A. certainly	B. obviously	C. privately	D. possibly
Question 49: According to the passage, what makes mobile phones potentially harmful is ________
	A. their radiant light.	B. their raiding power.
	C. their power of attraction.	D. their invisible rays.
Question 50. The most suitable title for the passage could be________
	A. Technological Innovations for Their Price.
	B. The Way Mobile Phones Work.
	C. The Reasons Why Mobile Phones Are Popular.
	D. Mobile Phones: A Must of Our Time.
_________THE END_________
 SỞ GD&ĐT VĨNH PHÚC
TRƯỜNG THPT LIỄN SƠN
(Đề thi gồm: 05 trang)
ĐỀ KTCL ÔN THI THPT QUỐC GIA NĂM 2017-2018
Môn: TIẾNG ANH – ĐỀ SỐ 351
Thời gian làm bài: 60 phút, không kể thời gian phát đề
Họ và tên thí sinh:. SBD:
Ø 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.
Question 01: A. wanted	B. stopped	C. decided	D. hated
Question 02: A. epidemic	B. illegal	C. education	D. competitor
Ø 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.
Question 03: A. offer	B. canoe	C. country	D. standard
Question 04: A. struggle	B. anxious	C. confide	D. comfort
Ø Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.
Question 05: All the candidate for the scholarship will be equally treated regarding of their age, sex, or nationality.
A. candidate 	B. scholarship 	C. regarding 	D. nationality
Question 06: Reminding not to miss the 15:20 train, the manager set out for the station in a hurry.
A. Reminding 	B. the 15:20 train	C. for 	D. in a hurry
Question 07: Because of bad weather conditions, it took the explorers three days reaching their destination.
A. Because 	B. weather conditions	C. the explorers 	D. reaching 
Ø Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Question 08: Armed terrorists are reported to have________ the embassy.
	A. taken up	B. taken to	C. taken over	D. taken after
Question 09: After reading the letter, ________ it on the table.
	A. leaving	B. and leaving	C. she left	D. and she left
Question 10: There is________ in my bed room.
	A. an old square wooden table	B. a square wooden old table
	C. a square old wooden table	D. an old wooden square table
Question 11: The boy________ went to the hospital to ask for doctor’s help.
	A. whose sick sister	B. whose sister sicked
	C. who his sister is sick	D. whose sister was sick
Question 12: ________ the phone rang later that night did Tom remember the appointment.
	A. No sooner	B. Only	C. Not until	D. Just before
Question 13: ________ of all the staff, I would like to wish you a happy retirement.
	A. Instead	B. In place	C. On behalf	D. On account
Question 14: ________ is the existence of a large number of different kinds of animals and plants which make a balanced environment.
	A. extinction	B. biodiversity	C. habitat	D. conservation
Question 15: I can’t imagine________ anywhere except here.
	A. studying	B. to study	C. study	D. that I study
Question 16: He managed to keep his job________ the manager had threatened to sack him.
	A. therefore	B. although	C. unless	D. despite
Question 17: The government made serious attempts to raise the________ of living.
	A. standard	B. cost	C. level	D. mode
Question 18: If you run________ Steve, give him my best wishes.
	A. over	B. up	C. into	D. to
Question 19: The doctor has advised________ less coffee.
	A. me drink	B. me to drink	C. me drinking	D. I will drink
Ø Mark the letter A, B, C or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.
Question 20:	- Hung: “Thank you very much for a lovely party”.	- Hoa: “_____________”
	A. Cheers	B. Have a good day	C. Thanks.	D. You are welcome
Question 21:	- Peter: My father’s much better now.	- Tom: “_____________”
	A. Oh, I’m pleased to hear it.	B. Oh, really? The doctor must be very good
	C. Good news for you.	D. Wonderful. Congratulations!
Ø Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.
Question 22: Today’s scientists have overcome many of the challenges of the depth by using more sophisticated tools.
	A. complicated	B. wordly	C. experienced	D. aware
Question 23: Experts often forecast an upswing in an economy after a protracted slowdown.
	A. a decline	B. an improvement	C. inflation	D. a reform
Ø 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.
Question 24: “That is a well-behaved boy whose behaviour has nothing to complain about”
	A. good behavior	B. behaving improperly	C. behaving nice	D. behaving cleverly
Question 25: After five days on trial, the court found him innocent of the crime and he was released.
	A. benevolent	B. innovative	C. naive	D. guilty
Ø Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is CLOSEST in meaning to each of the following questions.
Question 26: Do you see the smoke? It comes from the hills.
	A. Do you see the smoke which comes from the hills?
	B. Do you see the smole came from the hills?
	C. Do you see the smoke is coming from the hills?
	D. Do you see the smoke which it comes from the hills?
Question 27: “Don’t be so disappointed Jane. You can take the driving test again,” said Helen.
	A. Helen told Jane not to be disappointed and take the driving test again.
	B. Helen asked Jane not to be disappointed and offered her another driving test.
	C. Helen warned Jane not to be disappointed in order to take the driving test again.
	D. Helen encouraged Jane to take the driving test again.
Question 28: It’s hard to concentrate when you are tired.
	A. The more tired you are, it’s harder to concentrate.
	B. When you are tired, the harder it is to concentrate.
	C. The most tired you are, the hardest it is to concentrate.
	D. The more tired you are, the harder it is to concentrate.
Ø Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
Question 29: The coffee was not strong. It didn’t keep us awake.
	A. The coffee was very strong, but it couldn’t keep us awake.
	B. We were kept awake because the coffee was strong.
	C. The coffee was not strong enough to keep us awake.
	D. The coffee was so hot that it didn’t keep us awake.
Question 30: You don’t try to work hard. You will fail in the exam.
	A. Unless you don’t try to work hard, you will fail in the exam.
	B. Unless you try to work hard, you won’t fail in the exam.
	C. Unless you try to work hard, you will fail in the exam.
	D. Unless do you try to work hard, you will fail in the exam.
Ø 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.
THE DANGERS OF DIETING
Thanks to our moden lifestyle, with more and more time spent sitting down in front of computers than ever before, the (31)________ of overweight people is at a new high. As people frantically search for a solution (32)________ this problem, they often try some of the popular fad diets being offered. Many people sea fad diets (33)________ harmless ways of losing weight, and they are grateful to have them. Unfortunately, not only don’t fad diets usually (34) ________ weight. While the reckless use of fad diets can bring some initial results, long-term results are very rare.
Question 31: A. number	B. range	C. amount	D. sum
Question 32: A. on	B. of	C. to	D. with
Question 33: A. by	B. like	C. through	D. as
Question 34: A. bring	B. do	C. take	D. play
Question 35: A. lose	B. gain	C. put	D. reduce
Ø 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 42.
A recent survey of crime statistics shows that we are all more likely to be burgled now than 20 years ago and the police advise everyone to take a few simple precautions to protect their homes.
The first fact is that burglars and other intruders prefer easy opportunities, like a house which is very obviously empty. This is much less of a challenge than an occupied house, and one which is well-protected. A burglar will wonder if it is worth the bother.
There are some generalt ips on how to avoid your home becoming another crime statistic. Avoid leaving signs that your house is empty. When you have to go out, leave at least one light on as well as a radio or television, and do not leave any curtains wide open. The sight of your latest music centre or computer is enough to tempt any burglar.
Never leave a spare key in convenient hiding place. The first place a burglar will look is under the doormat or in a flower pot and even somewhere more ‘imaginative’ could soon be uncovered by the intruder. It is much safer to leave a key with a neighbour you can trust. But if your house is in a quiet, desolate area be aware that this will be a burglar’s dream, so deter any potential criminal from approaching your house by fitting security lights to the outside of your house.
But what could happen if, in spite of the aforementioned precautions, a burglar or intruder has decided to target your home. Windows are usually the first point of entry for many intruders. Downstairs windows provide easy access while upstairs windows can be reached with a ladder or by climbing up the drainpipe. Before going to bed you should double-check that all windows and shutters are locked. No matter how small your windows may be, it is surprising what a narrow gap a determined burglar can manage to get through. For extra security, fit window locks to the inside of the window.
What about entry via doors? Your back door and patio doors, which are easily forced open, should have top quality security locks fitted. Even though this is expensive it will be money well spent. Install a burglar alarm if you can afford it as another line of defence against intruders.
A sobering fact is that not all intruders have to break and enter into a property. Why go to the trouble of breaking in if you can just knock and be invited in? Beware of bogus officials or workmen and, particularly if you are elderly, fit a chain and an eye hole so that you scrutinise callers at your leisure. When you do have callers never let anybody into your home unless you are absolutely sure they are genuine. Ask to see an identity card, for example.
If you are in the frightening position of waking in the middle of the night and think you can hear an intruder, then on no account should you approach the intruder. It is far better to telephone the police and wait for help.
Question 36: A well-protected house ________ .
	A. is less likely to be burgled.	B. is regarded as a challenge by most criminals.
	C. is a lot of bother to maintain.	D. is very unlikely to be burgled.
Question 37: According to the writer, we should ________ .
	A. avoid leaving our house empty.
	B. only go out when we have to.
	C. always keep the curtains closed.
	D. give the impression that our house is occupied when we go out.
Question 38: The writer thinks that hiding a key under a doormat or in a flower pot________
	A. is predictable.	B. is useful.
	C. is imaginative.	D. is where you always find a spare key
Question 39: What word best replaces “desolate” in paragraph 4?
	A. isolated	B. populous	C. dissatisfying	D. depressing
Question 40: Gaining entry to a house through a small window________
	A. is surprisingly difficult.
	B. is not as difficult as people think.
	C. is less likely to happen than gaining entry through a door.
	D. is tried only by very determined burglars.
Question 41: The writer argues that fitting a chain and an eye hole________
	A. will prevent your home being burgled.
	B. avoids you having to invite people into your home.
	C. is only necessary for elderly people.
	D. gives you time to check if the visitor is genuine.
Question 42: The best title for the text is________
	A. Increasing household crime.	B. Protecting your home from intruders.
	C. What to do if a burglar breaks into your home.	D. Burglary statistics
Ø 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 43 to 50.
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 regula