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.

  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.

   Among the pollutants which have begun to disappear from the atmosphere are carbon monoxide, from car exhaust and burning rain forests, and methane from the guts of cattle, paddy fields, and gas fields. Even carbon dioxide, the main gas behind global warning, has fallen slightly.

   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 smogs 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 vehicle exhausts in America and Europe may have cut global carbon monoxide emissions, thereby allowing more hydroxyl to clean up other pollutants.

Question: Based on information in the passage, all of the following information referring to hydroxyl is true EXCEPT __________.

A. oxidization of pollutants is carried out by hydroxyl.

B. ultraviolet radiation increases production of hydroxyl.

C. there is difficulty in destroying carbon dioxide by hydroxyl.

D. the reduction in the ozone layer is beneficial to hydroxyl.

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.

  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.

   Among the pollutants which have begun to disappear from the atmosphere are carbon monoxide, from car exhaust and burning rain forests, and methane from the guts of cattle, paddy fields, and gas fields. Even carbon dioxide, the main gas behind global warning, has fallen slightly.

   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 smogs 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 vehicle exhausts in America and Europe may have cut global carbon monoxide emissions, thereby allowing more hydroxyl to clean up other pollutants.

Question: The word “purging” in line 2 is closest in meaning to __________.

A. refining

B. ridding

C. destroying

D. rising

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.

  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.

   Among the pollutants which have begun to disappear from the atmosphere are carbon monoxide, from car exhaust and burning rain forests, and methane from the guts of cattle, paddy fields, and gas fields. Even carbon dioxide, the main gas behind global warning, has fallen slightly.

   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 smogs 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 vehicle exhausts in America and Europe may have cut global carbon monoxide emissions, thereby allowing more hydroxyl to clean up other pollutants.

Question: The passage supports which of the following conclusion?

A. An expansion in hydroxyl has enlarged the ozone hole.

B. The decrease of methane has enabled ultraviolet radiation to enter the atmosphere.

C. The reduction in carbon dioxide has produced a cleaner atmosphere.

D. The beneficial effect of hydroxyl has aided the cleaning process.

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.

  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.

   Among the pollutants which have begun to disappear from the atmosphere are carbon monoxide, from car exhaust and burning rain forests, and methane from the guts of cattle, paddy fields, and gas fields. Even carbon dioxide, the main gas behind global warning, has fallen slightly.

   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 smogs 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 vehicle exhausts in America and Europe may have cut global carbon monoxide emissions, thereby allowing more hydroxyl to clean up other pollutants.

Question: The word “it” in paragraph 5 refers to ______.

A. the ozone hole

B. clean-up agent

C. acid rain

D. urban smog

Stories about how people somehow know when they are being watched have been going around for centuries. However, few (1)________ have been made to study the phenomenon scientifically. Now, with the accomplishment of the largest ever research of the so-called staring effect, there is striking indication that this is a recognizable and (2)________ sixth sense. The research elaborates thousands of kids. For the research, they stood with their eyes covered and with their backs to other youngsters, who were told to either stare at them or look away. The outcomes constantly revealed that the kids who could not see were able to (3)________ when they were being stared at. In total of 14.000 experiments (4)________ globally, the teenagers (5)________ sensed when they were being watched almost 81% of the time.

Điền vào số 4

A. controlled through

B. worked over

C. carried on

D. carried out

Stories about how people somehow know when they are being watched have been going around for centuries. However, few (1)________ have been made to study the phenomenon scientifically. Now, with the accomplishment of the largest ever research of the so-called staring effect, there is striking indication that this is a recognizable and (2)________ sixth sense. The research elaborates thousands of kids. For the research, they stood with their eyes covered and with their backs to other youngsters, who were told to either stare at them or look away. The outcomes constantly revealed that the kids who could not see were able to (3)________ when they were being stared at. In total of 14.000 experiments (4)________ globally, the teenagers (5)________ sensed when they were being watched almost 81% of the time.

Điền vào số 2

A. genuine

B. recognized

C. established

D. assured

Stories about how people somehow know when they are being watched have been going around for centuries. However, few (1)________ have been made to study the phenomenon scientifically. Now, with the accomplishment of the largest ever research of the so-called staring effect, there is striking indication that this is a recognizable and (2)________ sixth sense. The research elaborates thousands of kids. For the research, they stood with their eyes covered and with their backs to other youngsters, who were told to either stare at them or look away. The outcomes constantly revealed that the kids who could not see were able to (3)________ when they were being stared at. In total of 14.000 experiments (4)________ globally, the teenagers (5)________ sensed when they were being watched almost 81% of the time.

Điền vào số 1

A. efforts

B. attempts

C. exams

D. goals

Stories about how people somehow know when they are being watched have been going around for centuries. However, few (1)________ have been made to study the phenomenon scientifically. Now, with the accomplishment of the largest ever research of the so-called staring effect, there is striking indication that this is a recognizable and (2)________ sixth sense. The research elaborates thousands of kids. For the research, they stood with their eyes covered and with their backs to other youngsters, who were told to either stare at them or look away. The outcomes constantly revealed that the kids who could not see were able to (3)________ when they were being stared at. In total of 14.000 experiments (4)________ globally, the teenagers (5)________ sensed when they were being watched almost 81% of the time.

Điền vào số 3

A. sign

B. discovery

C. expose

D. tell