Câu hỏi:

17/06/2026 167

Read the following passage and mark the letter A, B, C, or D on your answer answer to each of the questions

An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or materials adversely . Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled – a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions. Many of more important air pollutants such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentrations of these pollutants were altered by various chemical reactions; they became components in biogeochemical cycle. Theseserve as an air purification scheme by allowing the compounds to move from the air to the water or soil on a global basis, nature's output of these compounds dwarfs that resulting from human activities.

However, human production usually occurs in a localized area, such as a city. In this localized regions, human output may be dominant and may temporarily overload the natural purification scheme of the cycle. The result is an increased concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0.08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however, as a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.

It can be inferred from the first paragraph that

A. water vapor is an air pollutant in localized areas

B. most air pollutants today can be seen or smelled

C. the definition of air pollution will continue to change

Đáp án chính xác

D. a substance becomes an air pollutant only in cities

Trả lời:

verified Giải bởi Vietjack

Đáp án C

Theo thông tin bài văn cung cấp, ta thấy:

-        "Air pollution requires a very flexible definition that permits continuous change."

-        "As technology has developed and knowledge of health aspects of various chemicals has increased, the list of air pollutants has lengthened."

-        "In the future, even water vapor might be considered an air pollutant under certain conditions."

Dịch nghĩa:

“Một chất ô nhiễm không khí được định nghĩa là một hợp chất được con người đưa vào khí quyển, trực tiếp hoặc gián tiếp, với số lượng đủ để ảnh hưởng xấu đến con người, động vật, thực vật hoặc vật liệu. Ô nhiễm không khí cần một định nghĩa linh hoạt cho phép sự thay đổi liên tục. Khi các đạo luật về ô nhiễm không khí đầu tiên được thiết lập ở Anh vào thế kỷ 14, các chất ô nhiễm không khí bị giới hạn ở những hợp chất có thể nhìn thấy hoặc ngửi thấy – một điều rất khác biệt so với danh sách dài các chất có hại mà chúng ta biết ngày nay. Khi công nghệ phát triển và hiểu biết về các khía cạnh sức khỏe của các hóa chất tăng lên, danh sách các chất ô nhiễm không khí đã được mở rộng. Trong tương lai, ngay cả hơi nước cũng có thể được xem là một chất ô nhiễm không khí trong một số điều kiện nhất định. Nhiều chất ô nhiễm quan trọng như oxit lưu huỳnh, monoxit carbon và oxit nitơ đều có mặt trong tự nhiên. Khi Trái Đất phát triển, nồng độ của những chất ô nhiễm này đã thay đổi qua các phản ứng hóa học khác nhau; chúng trở thành thành phần trong chu trình sinh hóa học. Những chất này đóng vai trò như một hệ thống lọc không khí bằng cách cho phép các hợp chất di chuyển từ không khí vào nước hoặc đất trên toàn cầu, sản lượng của những hợp chất này trong tự nhiên vượt xa lượng do hoạt động của con người gây ra. Tuy nhiên, sản xuất của con người thường xảy ra ở những khu vực có tính chất địa phương, chẳng hạn như thành phố. Trong những khu vực này, sản lượng của con người có thể chiếm ưu thế và có thể tạm thời quá tải hệ thống lọc tự nhiên của chu trình. Kết quả là nồng độ các hóa chất có hại trong không khí tăng lên. Nồng độ mà các tác động xấu xuất hiện sẽ lớn hơn so với nồng độ mà các chất ô nhiễm sẽ có trong trường hợp không có hoạt động của con người. Nồng độ thực tế không cần phải lớn để một chất trở thành chất ô nhiễm; thực tế, giá trị số học không nói lên nhiều điều cho đến khi chúng ta biết mức tăng này so với nồng độ mà sẽ xảy ra tự nhiên trong khu vực đó. Ví dụ, khí sulfur dioxide có tác động sức khỏe có thể phát hiện được ở mức 0.08 phần triệu (ppm), tức là gấp khoảng 400 lần mức tự nhiên của nó. Tuy nhiên, monoxit carbon có mức tự nhiên là 0.1 ppm và không thường xuyên được coi là chất ô nhiễm cho đến khi mức của nó đạt khoảng 15 ppm.”

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Read the following passage and mark the letter A, B, C, or D on your answer answer to each of the questions

An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or materials adversely . Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled – a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions. Many of more important air pollutants such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentrations of these pollutants were altered by various chemical reactions; they became components in biogeochemical cycle. Theseserve as an air purification scheme by allowing the compounds to move from the air to the water or soil on a global basis, nature's output of these compounds dwarfs that resulting from human activities.

However, human production usually occurs in a localized area, such as a city. In this localized regions, human output may be dominant and may temporarily overload the natural purification scheme of the cycle. The result is an increased concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0.08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however, as a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.

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One should be wary, however, of assuming that silent reading came about simply because reading aloud was a distraction to others. Examinations of factors related to the historical development of silent reading have revealed that it became the usual mode of reading for most adults mainly because the tasks themselves changed in character.

The last century saw a steady gradual increase in literacy and thus in the number of readers. As the number of readers increased, the number of potential listeners declined and thus there was some reduction in the need to read aloud. As reading for the benefit of listeners grew less common, so came the flourishing of reading as a private activity in such public places as libraries, railway carriages and offices, where reading aloud would cause distraction to other readers.Towards the end of the century, there was still considerable argument over whether books should be used for information or treated respectfully and over whether the reading of materials such as newspapers was in some way mentally weakening. Indeed, this argument remains with us still in education. However, whateverits virtues, the old shared literacy culture had gone and was replaced by the printed mass media on the one hand and by books and periodicals for a specialised readership on the other.

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Mark the letter A, B, C, or D on your answer answer sheet to indicate the underlined part that needs correction in each of the questions

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Câu 7:

Read the following passage and mark the letter A, B, C, or D on your answer answer to each of the questions

An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or materials adversely . Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled – a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions. Many of more important air pollutants such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentrations of these pollutants were altered by various chemical reactions; they became components in biogeochemical cycle. Theseserve as an air purification scheme by allowing the compounds to move from the air to the water or soil on a global basis, nature's output of these compounds dwarfs that resulting from human activities.

However, human production usually occurs in a localized area, such as a city. In this localized regions, human output may be dominant and may temporarily overload the natural purification scheme of the cycle. The result is an increased concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0.08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however, as a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.

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Xem đáp án » 17/06/2026 305

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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

Reading to oneself is a modern activity which was almost unknown to the scholars of the classical and medieval worlds, while during the fifteenth century the term “reading” undoubtedly meant reading aloud. Only during the nineteenth century did silent reading become commonplace.

One should be wary, however, of assuming that silent reading came about simply because reading aloud was a distraction to others. Examinations of factors related to the historical development of silent reading have revealed that it became the usual mode of reading for most adults mainly because the tasks themselves changed in character.

The last century saw a steady gradual increase in literacy and thus in the number of readers. As the number of readers increased, the number of potential listeners declined and thus there was some reduction in the need to read aloud. As reading for the benefit of listeners grew less common, so came the flourishing of reading as a private activity in such public places as libraries, railway carriages and offices, where reading aloud would cause distraction to other readers.Towards the end of the century, there was still considerable argument over whether books should be used for information or treated respectfully and over whether the reading of materials such as newspapers was in some way mentally weakening. Indeed, this argument remains with us still in education. However, whateverits virtues, the old shared literacy culture had gone and was replaced by the printed mass media on the one hand and by books and periodicals for a specialised readership on the other.

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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

Reading to oneself is a modern activity which was almost unknown to the scholars of the classical and medieval worlds, while during the fifteenth century the term “reading” undoubtedly meant reading aloud. Only during the nineteenth century did silent reading become commonplace.

One should be wary, however, of assuming that silent reading came about simply because reading aloud was a distraction to others. Examinations of factors related to the historical development of silent reading have revealed that it became the usual mode of reading for most adults mainly because the tasks themselves changed in character.

The last century saw a steady gradual increase in literacy and thus in the number of readers. As the number of readers increased, the number of potential listeners declined and thus there was some reduction in the need to read aloud. As reading for the benefit of listeners grew less common, so came the flourishing of reading as a private activity in such public places as libraries, railway carriages and offices, where reading aloud would cause distraction to other readers.Towards the end of the century, there was still considerable argument over whether books should be used for information or treated respectfully and over whether the reading of materials such as newspapers was in some way mentally weakening. Indeed, this argument remains with us still in education. However, whateverits virtues, the old shared literacy culture had gone and was replaced by the printed mass media on the one hand and by books and periodicals for a specialised readership on the other.

By the end of the twentieth century, students were being recommended to adopt attitudes to books and to use reading skills which were inappropriate, if not impossible, for the oral reader. The social, cultural and technological changes in the century had greatly altered what the term “reading” implied.

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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

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Câu 14:

Mark the letter A, B, C, or D on your answer answer sheet to indicate the underlined part that needs correction in each of the questions

Each of the beautiful cars in the shop was quickly sold to their owner

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Câu 15:

________taken my parents’ advice, I wouldn't be a teacher now.

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