Read the following passage and mark the letter A, B, C, or D to indicate the correct word for each of the blanks from 46 to 55.. Computing is now (46)___ the same stage as printing [r]
(1)TRUNG TÂM LUYỆN THI ĐẠI HỌC CHẤT LƯỢNG CAO QSC-45
ĐỀ THI ĐẠI HỌC (TTLT QSC-45) SỐ 19 MÔN TIẾNG ANH – KHỐI D
Thời gian làm bài: 90 phút
ĐỀ THI GỒM CÓ 80 CÂU
I Mark A,B,C or D to indicate the word that is pronounced differently from the rest
A event B prevent C percent D agent
A sword B whole C answer D sweet
A river B rival C native D driven
A broad B load C road D boat
A measure B pleasure C ensure D leisure
II Mark A,B,C or D to indicate the word whose main stress differs from the rest
A benefit B industry C inherit D architect
A contrary B graduate C document D attendance A emphasize B contribute C maintenance D heritage A comprehend B entertain C develop D introduce
10 A image B predict C envy D cover
III Mark A, B, C or D to indicate the correct answer to each of the following questions 11 The president is going to _ an important speech tomorrow night
A B perform C deliver D send
12 The examination was by no easy, and I doubted if I have passed it
A way B case C means D road
13 _ appear, they are really much larger than the Earth
A As the small stars B The stars as small
C Despite of the small stars D Small as the stars 14 After running up the stairs, I was breath
A without B out of C no D away from
15 I know his name, but I can’t recall it at the moment It’s on the tip of
A tongue B brain C mind D memory
16 to the big city, I have got lost many times
A Useless B Unused C Unfamiliar D Unacquainted
17 If he hadn’t lost his job last year, he _ a house of his own now
A can buy B will buy C could buy D could have bought 18 He has a big house and an expensive car, not to _ a villa in Dalat
A infer B refer C mention D imply
19 The teacher asked a difficult question, but finally Ted _ a good answer
A put up with B keep pace with C made way for D came up with 20 The volcano which had been _ for years suddenly exploded
A passive B idle C immobile D inactive
21 Although he was completely , he produced the most beautiful table
A unable B incapable C uneducated D untrained
22 We can put you _ for a few days if you have nowhere else to live
A on B out C up D off
23 Andrew is known for always saying _ comes to his mind
A anything B something C everything D whatever
24 It’s hard to _ well with him He’s got such a difficult character
A get over B get on C get into D get in
25 If that old vase is a _ one, it will cost a lot of money
A sincere B genuine C truthful D realistic
26 Hard work can often bring _ success
A into B in C about D up
27 He _ a big fortune when he was young, so he didn’t have to work hard
(2)28 He manages to visit his parents _ Saturday
A another every B every other C every the other D other every 29 _, all animals need oxygen, water, food and proper range of weather
A Being survive B To survive C When surviving D Surviving 30 In order to avoid boredom, the most important thing is to keep oneself _
A occupation B occupational C occupied D preoccupied
IV Read the 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 31 to 40.
During the nineteenth century, women in the United States organized and participated in a large number of reform movements, including movements to reorganize the prison system, improve education, ban the sale of alcohol, and, most importantly, to free the slaves Some women saw similarities in the social status of women and slaves Women like Elizabeth Cady, Stanton and Lucy Stone were feminists and abolitionists who supported the rights of both women and blacks A number of male abolitionists, including William Lloyd Garrison and Wendell Philips, also supported the rights of women to speak and participate equally with men in anti-slavery activities Probably more than any other movement, abolitionism offered women a previously denied entry into politics They became involved primarily in order to better their living conditions and the conditions of others
When the Civil War ended in 1865, the Fourteenth and Fifteenth Amendments to the Constitution adopted in 1868 and 1870 granted citizenship and suffrage to blacks but not to women Discouraged but resolved, feminists influenced more and more women to demand the right to vote In 1869 the Wyoming Territory had yielded to demands by feminists, but eastern states resisted more stubbornly than before A women’s suffrage bill had been presented to every Congress since 1878, but it continually failed to pass until 1920, when the Nineteenth Amendment granted women the right to vote
31 With which topic is the passage primary concerned ?
A The Wyoming Territory C Abolitionists B The Foundation and 15th Amendments D Women’s suffrage. 32 The word “ban” in line most nearly means to
A encourage B publish C prohibit D limit
33 According to the passage, why did women became active in politics ? A To improve the conditions of life that existed at the time
B To support Elizabeth Cady Stanton for president C To be selected to public office
D To amend the Declaration of Independence
34 The word “supported” in line could best be replaced by
A disregarded B promote C contested D acknowledged
35 The word “primarily” in line is closest in meaning to
A above all B somewhat C finally D always
36 What had occurred shortly after the Civil War ? A The Wyoming Territory was admitted to the Union B A women’s suffrage bill was introduced in Congress C The eastern states resisted the end of the war
D Black people were granted the right to vote
37 The word “suffrage” in line 12 could best be replaced by which of the following ?
A pain B citizenship C the right to vote D freedom from bondage 38 The word “it” in line 16 refers to
A bill B Congress C vote D Nineteenth Amendment 39 What dose the Nineteenth Amendment guarantee ?
A Voting rights for blacks B Citizenship for blacks C Voting rights for women D Citizenship for women 40 When were women allowed to vote throughout the United States ?
A After 1866 B After 1870 C After 1878 D After 1920
V Mark the letter A, B, C or D to complete each of the following sentences 41 The student like that teacher because
A he gives few homework to B he gives little or no homework to C of not homework to at home D there isn’t a large number of homework 42 Mr Robert is a famous chemist, _
(3)
43 It was not until she had arrived home her appointment with the doctor A when she remembered B that she remembered
C and she remembered D did she remember 44 Since he changed his job, David yearly income has
A nearly doubled B got almost twice bigger
C almost grown by twice D just about gone up twice 45 Having been delayed by heavy traffic, _
A it was difficult for her to arrive on time B it was unable for her to arrive on time C her being late was intolerable D she was unable to arrive on time
VI Read the following passage and mark the letter A, B, C, or D to indicate the correct word for each of the blanks from 46 to 55
Computing is now (46) _ the same stage as printing was, when the first printing presses were used Before printing presses were invented, only rich people like kings and dukes could (47) to buy books Often these people were unable to read and had not enough time to learn
In any case, the books were (48) big that it was difficult for anyone to relax with a book (49) we today They wanted books because they were expensive and there was something magical about them Only a few people were able to write, and it (50) an extremely long time to write a book Monks and other people who could write said that (51) people could never learn to read
The position with computer is very (52) _ today A few years ago, computers were very large and expensive Business managers and rich people (53) them but they didn’t know how to use them In many countries, (54) _, the situation has now completely changed Lots of people not only own microcomputer but
know how to use them (55) _
46 A in B at C on D of
47 A prefer B suffer C afford D offer
48 A very B such C quite D so
49 A like B as C such as D alike
50 A took B spent C wasted D got
51 A general B common C ordinary D simple
52 A same B similar C like D likely
53 A subscribed B booked C ordered D afforded
54 A although B moreover C besides D however
55 A also B even C as well D at all
VII Mark the letter A, B, C, or D to show the underlined part that needs correction
56 Sometimes students don’t well in the examination because they are very nervous to concentrate A B C D (too)
57 Doctors have always recommended that a person with a cold must drink fluids, such as juice or water to prevent A B(should drink) C D the loss of water in his / her body
58. It was not until 1922 when scientists learned about the existence of dinosaurs A B (that) C D
59 Many people live in Shanghai, the largest city in China, than any other city. A (More) B C D 60 Five miles beyond the hills were a fire with its flames reaching up to the sky
A B (was) C D
VIII Mark the letter A, B, C, or D to indicate the sentence that is closest in meaning to each of the following questions.
(4)62 He spent all his money He even borrowed some from me
A As soon as he borrowed some money from me, he spent it all B Hardly had he borrowed some money from me when he spent it all C Not only did he spend all his money but also he borrowed some from me D Not only did he spend all his money but he borrowed some from me as well 63 We can avoid waiting by booking tickets in advance
A If we avoid waiting we will book tickets in advance B If we book tickets we can avoid waiting in advance C If we book tickets in advance we can avoid waiting D If we booked tickets before we could avoid waiting
64 It was his lack of confidence that surprised me A He surprised me by his lack of confidence B What surprised me was his lack of confidence C That his lack of confidence surprised me D That he lacked of confidence surprised me 65 As he gets older, he wants to travel less
A As soon as he wants to travel less, he gets older B The less he wants to travel, the older he gets
C The more old age he gets, the less he wants to travel D The older he gets, the less he wants to travel
66 She only felt relaxed after a few months working for him A She used to feel relaxed working for him a few months
B A few months ago, she didn’t find it relaxed working for him C Only after a few months working for him did she feel relaxed D It was not until a few months working for him did she feel relaxed 67 Everyone expected her to win the tournament, but she didn’t
A Unlike everyone expected, she didn’t win the tournament B Everyone was unexpected when she won the tournament C Contrary to everyone’s expectation, she lost the tournament D To everyone’s expectation, she won the tournament
68 We have run out of the items you want
A We have to run out to buy the items you want B The items you want are out of our shop C The items you want have been out of stock D For the items you want, we must run out
69 I am sorry I didn’t arrive in time to see her off
A I am sorry for not having arrived in time to see her off B I regret not arriving in time to see her off
C I wasn’t early enough to see her off and regret it now D All are correct
70 I didn’t mean to offend you
A Offending you was meaningless to me B I had no intention of offending you C It was meaningless of me to offend you
D What I offended you was meaningless
IX Read the passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 71 to 80.
The air above our head is becoming cleaner A breath of fresh air has been running right round the planet for the past five years The planet is apparently purging itself of pollution Paul Novell of the University of Colorado, the co-author of a report on this phenomenon says, “It seems as if the planet’s own cleaning service has suddenly got a new lease of life Suddenly, there are a lot of changes going on up there”
Estimates of the death toll from urban smog have been steadily rising, so the new cleaner trend could have significant consequences for life expectancy in cities as well as for the planet itself The sudden and unexpected reversal of several decades of worsening pollution extends from the air in city streets to the remotest mid-Pacific Ocean and Antarctica
(5)There are two theories about why pollution is disappearing First that there is less pollution to start with due to laws to cut down urban smog and acid rain starting to have a global impact Second, that the planet may be becoming more efficient at cleaning up
The main planetary clean-up agent is a chemical called hydroxyl It is present throughout the atmosphere in tiny quantities and removes most pollutants from the air by oxidizing them The amount of hydroxyl in the air has fallen by a quarter in 1980s Now it may be reviving for two reasons : ironically, because the ozone hole has expanded, letting in more ultraviolet radiation into the lower atmosphere, where it manufactures hydroxyl Then the stricter controls on vehicles exhaust in America and Europe may have cut global carbon monoxide emission, thereby allowing more hydroxyl to clean up other pollutants
71 What is the main topic of the passage? A The decreasing pollution of the atmosphere B The oxygenation of the atmosphere
C The changing pollutants in the atmosphere D Hydroxyl’s influence on the atmosphere
72 The word “purging” in line is closest in meaning to
A destroying B refining C filtering D ridding
73 According to the passage, life expectancy partly depends on people having A recommendations from university research
B access to details about atmosphere C improvement in atmosphere conditions D changes in their lifestyle
74 The word “toll” in line could best be replaced by
A costs B count C damage D loss
75 What does the author suggest is the main cause of pollution reduction? A Less impact from burning forest B A smaller number of cars C A curtailment of chemicals D Fewer cattle and gas field 76 The word “it” in paragraph refers to
A urban smog B a clean-up agent C acid rain D the ozone hole 77 It can be inferred from the passage that the cleansing of the planet is
A inexplicable B confusing C surprising D predictable
78 The word “reviving” in line 18 is closest in meaning to
A reappearing B refreshing C reproducing D repeating 79 All of the following information referring to hydroxyl is true EXCEPT
A the reduction in the ozone layer is beneficial to hydroxyl B Oxidization of pollutants is carried out by hydroxyl
C there is difficulty in destroying carbon dioxide by hydroxyl D ultraviolet radiation increases production of hydroxyl 80 The passage supports which of the following conclusion?
A The decrease of methane has enabled ultraviolet radiation to enter the atmosphere B An expansion in hydroxyl has enlarged the ozone hole
C The reduction in carbon dioxide has produced a cleaner atmosphere D The beneficial effect of hydroxyl has aided the cleaning process
Giáo viên đề thi : NGUYỂN TẤN MỸ ( 0908.162.774 ) E-MAIL : tanmy_49@ yahoo.com.vn
(6)TRUNG TÂM LUYỆN THI ĐẠI HỌC CHẤT LƯỢNG CAO QSC-45
ĐỀ THI ĐẠI HỌC (TTLT QSC-45) SỐ 19 MÔN TIẾNG ANH – KHỐI D
Thời gian làm bài: 90 phút
ĐỀ THI GỒM CÓ 80 CÂU
I. Mark A,B,C or D to indicate the word that is pronounced differently from the rest
A event B prevent C percent D agent
A sword B whole C answer D sweet
A river B rival C native D driven
A broad B load C road D boat
A measure B pleasure C ensure D leisure
II. Mark A,B,C or D to indicate the word whose main stress differs from the rest.
A benefit B industry C inherit D architect
A contrary B graduate C document D attendance
A emphasize B contribute C maintenance D heritage A comprehend B entertain C develop D introduce
10 A image B predict C envy D cover
III Mark A, B, C or D to indicate the correct answer to each of the following questions.
11 The president is going to _ an important speech tomorrow night
A B perform C deliver D send
12 The examination was by no easy, and I doubted if I have passed it.
A way B case C means D road
13 _ appear, they are really much larger than the Earth
A As the small stars B The stars as small
C Despite of the small stars D Small as the stars 14 After running up the stairs, I was breath
A without B out of C no D away from
15 I know his name, but I can’t recall it at the moment It’s on the tip of
A tongue B brain C mind D memory
16 to the big city, I have got lost many times
A Useless B Unused C Unfamiliar D Unacquainted
17 If he hadn’t lost his job last year, he _ a house of his own now
A can buy B will buy C could buy D could have bought 18 He has a big house and an expensive car, not to _ a villa in Dalat
A infer B refer C mention D imply
19 The teacher asked a difficult question, but finally Ted _ a good answer
A put up with B keep pace with C made way for D came up with 20 The volcano which had been _ for years suddenly exploded
A passive B idle C immobile D inactive
21 Although he was completely , he produced the most beautiful table
A unable B incapable C uneducated D untrained
22 We can put you _ for a few days if you have nowhere else to live
A on B out C up D off
23 Andrew is known for always saying _ comes to his mind
A anything B something C everything D whatever
24 It’s hard to _ well with him He’s got such a difficult character
A get over B get on C get into D get in
25 If that old vase is a _ one, it will cost a lot of money
A sincere B genuine C truthful D realistic
26 Hard work can often bring _ success
A into B in C about D up
27 He _ a big fortune when he was young, so he didn’t have to work hard
(7)28 He manages to visit his parents _ Saturday
A another every B every other C every the other D other every 29 _, all animals need oxygen, water, food and proper range of weather
A Being survive B To survive C When surviving D Surviving 30 In order to avoid boredom, the most important thing is to keep oneself _
A occupation B occupational C occupied D preoccupied
IV Read the 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 31 to 40.
During the nineteenth century, women in the United States organized and participated in a large number of reform movements, including movements to reorganize the prison system, improve education, ban the sale of alcohol, and, most importantly, to free the slaves Some women saw similarities in the social status of women and slaves Women like Elizabeth Cady, Stanton and Lucy Stone were feminists and abolitionists who supported the rights of both women and blacks A number of male abolitionists, including William Lloyd Garrison and Wendell Philips, also supported the rights of women to speak and participate equally with men in anti-slavery activities Probably more than any other movement, abolitionism offered women a previously denied entry into politics They became involved primarily in order to better their living conditions and the conditions of others
When the Civil War ended in 1865, the Fourteenth and Fifteenth Amendments to the Constitution adopted in 1868 and 1870 granted citizenship and suffrage to blacks but not to women Discouraged but resolved, feminists influenced more and more women to demand the right to vote In 1869 the Wyoming Territory had yielded to demands by feminists, but eastern states resisted more stubbornly than before A women’s suffrage bill had been presented to every Congress since 1878, but it continually failed to pass until 1920, when the Nineteenth Amendment granted women the right to vote
31 With which topic is the passage primary concerned ?
A The Wyoming Territory C Abolitionists B The Foundation and 15th Amendments D Women’s suffrage. 32 The word “ban” in line most nearly means to
A encourage B publish C prohibit D limit
33 According to the passage, why did women became active in politics ? A To improve the conditions of life that existed at the time. B To support Elizabeth Cady Stanton for president
C To be selected to public office
D To amend the Declaration of Independence
34 The word “supported” in line could best be replaced by
A disregarded B promote C contested D acknowledged
35 The word “primarily” in line is closest in meaning to
A above all. B somewhat C finally D always
36 What had occurred shortly after the Civil War ? A The Wyoming Territory was admitted to the Union B A women’s suffrage bill was introduced in Congress C The eastern states resisted the end of the war
D Black people were granted the right to vote.
37 The word “suffrage” in line 12 could best be replaced by which of the following ?
A pain B citizenship C the right to vote D freedom from bondage 38 The word “it” in line 16 refers to
A bill B Congress C vote D Nineteenth Amendment
39 What dose the Nineteenth Amendment guarantee ?
A Voting rights for blacks B Citizenship for blacks
C Voting rights for women. D Citizenship for women
40 When were women allowed to vote throughout the United States ?
A After 1866 B After 1870 C After 1878 D After 1920
V Mark the letter A, B, C or D to complete each of the following sentences.
41 The student like that teacher because
A he gives few homework to B he gives little or no homework to do. C of not homework to at home D there isn’t a large number of homework 42 Mr Robert is a famous chemist, _
(8)
43 It was not until she had arrived home her appointment with the doctor
A when she remembered B that she remembered
C and she remembered D did she remember 44 Since he changed his job, David yearly income has
A nearly doubled B got almost twice bigger
C almost grown by twice D just about gone up twice 45 Having been delayed by heavy traffic, _
A it was difficult for her to arrive on time B it was unable for her to arrive on time C her being late was intolerable D she was unable to arrive on time
VI Read the following passage and mark the letter A, B, C, or D to indicate the correct word for each of the blanks from 46 to 55.
Computing is now (46) _ the same stage as printing was, when the first printing presses were used Before printing presses were invented, only rich people like kings and dukes could (47) to buy books Often these people were unable to read and had not enough time to learn
In any case, the books were (48) big that it was difficult for anyone to relax with a book (49) we today They wanted books because they were expensive and there was something magical about them Only a few people were able to write, and it (50) an extremely long time to write a book Monks and other people who could write said that (51) people could never learn to read
The position with computer is very (52) _ today A few years ago, computers were very large and expensive Business managers and rich people (53) them but they didn’t know how to use them In many countries, (54) _, the situation has now completely changed Lots of people not only own microcomputer but
know how to use them (55) _
46 A in B at C on D of
47 A prefer B suffer C afford D offer
48 A very B such C quite D so
49 A like B as C such as D alike
50 A took B spent C wasted D got
51 A general B common C ordinary D simple
52 A same B similar C like D likely
53 A subscribed B booked C ordered D afforded
54 A although B moreover C besides D however
55 A also B even C as well D at all
VII Mark the letter A, B, C, or D to show the underlined part that needs correction.
56 Sometimes students don’t well in the examination because they are very nervous to concentrate A B C D (too)
57 Doctors have always recommended that a person with a cold must drink fluids, such as juice or water to prevent A B(should drink) C D the loss of water in his / her body
58. It was not until 1922 when scientists learned about the existence of dinosaurs A B (that) C D
59 Many people live in Shanghai, the largest city in China, than any other city. A (More) B C D 60 Five miles beyond the hills were a fire with its flames reaching up to the sky
A B (was) C D
VIII Mark the letter A, B, C, or D to indicate the sentence that is closest in meaning to each of the following questions.
(9)62 He spent all his money He even borrowed some from me
A As soon as he borrowed some money from me, he spent it all B Hardly had he borrowed some money from me when he spent it all C Not only did he spend all his money but also he borrowed some from me
D Not only did he spend all his money but he borrowed some from me as well 63 We can avoid waiting by booking tickets in advance
A If we avoid waiting we will book tickets in advance B If we book tickets we can avoid waiting in advance
C If we book tickets in advance we can avoid waiting
D If we booked tickets before we could avoid waiting 64 It was his lack of confidence that surprised me
A He surprised me by his lack of confidence B What surprised me was his lack of confidence. C That his lack of confidence surprised me
D That he lacked of confidence surprised me 65 As he gets older, he wants to travel less
A As soon as he wants to travel less, he gets older B The less he wants to travel, the older he gets
C The more old age he gets, the less he wants to travel D The older he gets, the less he wants to travel. 66 She only felt relaxed after a few months working for him A She used to feel relaxed working for him a few months
B A few months ago, she didn’t find it relaxed working for him C Only after a few months working for him did she feel relaxed. D It was not until a few months working for him did she feel relaxed 67 Everyone expected her to win the tournament, but she didn’t
A Unlike everyone expected, she didn’t win the tournament B Everyone was unexpected when she won the tournament C Contrary to everyone’s expectation, she lost the tournament. D To everyone’s expectation, she won the tournament
68 We have run out of the items you want
A We have to run out to buy the items you want B The items you want are out of our shop C The items you want have been out of stock D For the items you want, we must run out
69 I am sorry I didn’t arrive in time to see her off
A I am sorry for not having arrived in time to see her off B I regret not arriving in time to see her off
C I wasn’t early enough to see her off and regret it now D All are correct
70 I didn’t mean to offend you
A Offending you was meaningless to me B I had no intention of offending you. C It was meaningless of me to offend you
D What I offended you was meaningless
IX Read the passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 71 to 80.
The air above our head is becoming cleaner A breath of fresh air has been running right round the planet for the past five years The planet is apparently purging itself of pollution Paul Novell of the University of Colorado, the co-author of a report on this phenomenon says, “It seems as if the planet’s own cleaning service has suddenly got a new lease of life Suddenly, there are a lot of changes going on up there”
Estimates of the death toll from urban smog have been steadily rising, so the new cleaner trend could have significant consequences for life expectancy in cities as well as for the planet itself The sudden and unexpected reversal of several decades of worsening pollution extends from the air in city streets to the remotest mid-Pacific Ocean and Antarctica
(10)There are two theories about why pollution is disappearing First that there is less pollution to start with due to laws to cut down urban smog and acid rain starting to have a global impact Second, that the planet may be becoming more efficient at cleaning up
The main planetary clean-up agent is a chemical called hydroxyl It is present throughout the atmosphere in tiny quantities and removes most pollutants from the air by oxidizing them The amount of hydroxyl in the air has fallen by a quarter in 1980s Now it may be reviving for two reasons : ironically, because the ozone hole has expanded, letting in more ultraviolet radiation into the lower atmosphere, where it manufactures hydroxyl Then the stricter controls on vehicles exhaust in America and Europe may have cut global carbon monoxide emission, thereby allowing more hydroxyl to clean up other pollutants
71 What is the main topic of the passage?
A The decreasing pollution of the atmosphere. B The oxygenation of the atmosphere
C The changing pollutants in the atmosphere D Hydroxyl’s influence on the atmosphere
72 The word “purging” in line is closest in meaning to
A destroying B refining. C filtering D ridding
73 According to the passage, life expectancy partly depends on people having A recommendations from university research
B access to details about atmosphere C improvement in atmosphere conditions. D changes in their lifestyle
74 The word “toll” in line could best be replaced by
A costs B count. C damage D loss
75 What does the author suggest is the main cause of pollution reduction?
A Less impact from burning forest B A smaller number of cars. C A curtailment of chemicals D Fewer cattle and gas field 76 The word “it” in paragraph refers to
A urban smog B a clean-up agent. C acid rain D the ozone hole 77 It can be inferred from the passage that the cleansing of the planet is
A inexplicable B confusing C surprising D predictable
78 The word “reviving” in line 18 is closest in meaning to
A reappearing B refreshing C reproducing D repeating 79 All of the following information referring to hydroxyl is true EXCEPT
A the reduction in the ozone layer is beneficial to hydroxyl B Oxidization of pollutants is carried out by hydroxyl
C there is difficulty in destroying carbon dioxide by hydroxyl. D ultraviolet radiation increases production of hydroxyl
80 The passage supports which of the following conclusion?
A The decrease of methane has enabled ultraviolet radiation to enter the atmosphere B An expansion in hydroxyl has enlarged the ozone hole
C The reduction in carbon dioxide has produced a cleaner atmosphere D The beneficial effect of hydroxyl has aided the cleaning process.
Giáo viên đề thi : NGUYỂN TẤN MỸ ( 0908.162.774 ) E-MAIL : tanmy_49@ yahoo.com.vn