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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 from 30 to 37.

  Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds – any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede farming. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They compete for sunlight, nutrients, and water with useful plants.

The global need for weed control had been answered mainly by the chemical industry. Its herbicides are effective and sometimes necessary, but some pose serious problems, particularly if misused. Toxic compounds threaten animal and public health when they accumulate in food plants, groundwater, and drinking water. They also harm workers who apply them.

  In recent years, the chemical industry has introduced several herbicides that are more ecologically sound. Yet new chemicals alone cannot solve the world’s weed problems. Hence, scientists are exploring the innate weed-killing powers of living organisms, primarily insects and microorganisms.

The biological agents now in use are environmentally benign and are harmless to humans. They can be chosen for their ability to attack selected targets and leave crops and other plants untouched. In contrast, some of the most effective chemicals kill virtually all the plants they come in contact with, sparing only those that are naturally resistant or have been genetically modified for resistance. Furthermore, a number of biological agents can be administered only once, after which no added applications are needed. Chemicals typically must be used several times per growing season.

The word ‘marring’ in bold is closest in meaning to

A. planting

B. spoiling 

C. dividing

D. replacin

1
15 tháng 7 2019

Đáp án B

Từ ‘marring’ in đậm gần nghĩa nhất với 

A. trồng 

B. làm hỏng 

C. phân chia  

D. thay thế

Dịch bài đọc:

Con người đã chống cỏ dại từ khi bắt đầu nông nghiệp. Làm hỏng vườn của chúng ta là một trong những ảnh hưởng nhẹ nhàng của cỏ dại - bất kỳ loài cây nào phát triển nơi chúng không cần thiết. Chúng làm tắc nghẽn đường dẫn nước, phá huỷ môi trường sống của động vật hoang dã và cản trở việc nuôi trồng. Sự lây lan của chúng sẽ xoá bỏ các khu vực chăn thả và chiếm một phần ba lượng mất mùa. Chúng cạnh tranh ánh sáng mặt trời, chất dinh dưỡng, và nước với cây trồng hữu ích.

Nhu cầu kiểm soát cỏ dại toàn cầu đã được hồi đáp chủ yếu bởi ngành công nghiệp hoá chất. Thuốc diệt cỏ có hiệu quả và đôi khi cần thiết, nhưng một số lại gây ra những vấn đề nghiêm trọng, đặc biệt nếu lạm dụng. Các hợp chất độc hại đe doạ động vật và sức khoẻ cộng đồng khi chúng tích tụ trong thực phẩm, nước ngầm và nước uống. Chúng cũng làm hại người sử dụng chúng.

Trong những năm gần đây, ngành công nghiệp hóa chất đã đưa ra một số chất diệt cỏ có vẻ sinh thái hơn. Tuy nhiên, các hóa chất mới không thể giải quyết được vấn đề cỏ dại trên thế giới. Do đó, các nhà khoa học đang khám phá năng lực diệt cỏ bẩm sinh của sinh vật sống, chủ yếu là côn trùng và vi sinh vật.

Các tác nhân sinh học hiện nay đang sử dụng rất thân thiện với môi trường và không gây hại cho con người. Chúng có thể được lựa chọn bởi khả năng tấn công các mục tiêu đã chọn của chúng và cây mùa vụ và các cây trồng khác không bị ảnh hưởng. Ngược lại, một số hóa chất có hiệu quả nhất giết chết hầu như tất cả các cây mà chúng tiếp xúc, chỉ còn lại những cây có khả năng đề kháng tự nhiên hoặc đã được biến đổi gen để đề kháng. Hơn nữa, một số tác nhân sinh học có thể được sử dụng một lần, sau đó không cần thiết điều trị nào nữa. Hóa chất thường phải được sử dụng nhiều lần trong mỗi mùa vụ.

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 30 to 37.  Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds – any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede farming. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They...
Đọc tiếp

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 30 to 37.

  Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds – any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede farming. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They compete for sunlight, nutrients, and water with useful plants.

The global need for weed control had been answered mainly by the chemical industry. Its herbicides are effective and sometimes necessary, but some pose serious problems, particularly if misused. Toxic compounds threaten animal and public health when they accumulate in food plants, groundwater, and drinking water. They also harm workers who apply them.

  In recent years, the chemical industry has introduced several herbicides that are more ecologically sound. Yet new chemicals alone cannot solve the world’s weed problems. Hence, scientists are exploring the innate weed-killing powers of living organisms, primarily insects and microorganisms.

The biological agents now in use are environmentally benign and are harmless to humans. They can be chosen for their ability to attack selected targets and leave crops and other plants untouched. In contrast, some of the most effective chemicals kill virtually all the plants they come in contact with, sparing only those that are naturally resistant or have been genetically modified for resistance. Furthermore, a number of biological agents can be administered only once, after which no added applications are needed. Chemicals typically must be used several times per growing season.

Which of the following statements about the use of chemical agents as herbicides would the author most likely agree?

A. It has become more dangerous recently.

B. It is occasionally required.

C. It is safe but inefficient.

D. It should be increased.

1
5 tháng 9 2017

Đáp án B

 Câu nào trong những câu sau đây về việc sử dụng các tác nhân hóa học như chất diệt cỏ tác giả có thể đồng ý?

 A. Gần đây đã trở nên nguy hiểm hơn.

 B. Nó thỉnh thoảng cần thiết.

 C. Nó an toàn nhưng không hiệu quả.

 D. Nó nên được tăng lên.

Thông tin: The global need for weed control had been answered mainly by the chemical industry. Its herbicides are effective and sometimes necessary (Nhu cầu kiểm soát cỏ dại toàn cầu đã được hồi đáp chủ yếu bởi ngành công nghiệp hoá chất. Thuốc diệt cỏ có hiệu quả và đôi khi cần thiết)

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 30 to 37.  Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds – any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede farming. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They...
Đọc tiếp

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 30 to 37.

  Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds – any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede farming. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They compete for sunlight, nutrients, and water with useful plants.

The global need for weed control had been answered mainly by the chemical industry. Its herbicides are effective and sometimes necessary, but some pose serious problems, particularly if misused. Toxic compounds threaten animal and public health when they accumulate in food plants, groundwater, and drinking water. They also harm workers who apply them.

  In recent years, the chemical industry has introduced several herbicides that are more ecologically sound. Yet new chemicals alone cannot solve the world’s weed problems. Hence, scientists are exploring the innate weed-killing powers of living organisms, primarily insects and microorganisms.

The biological agents now in use are environmentally benign and are harmless to humans. They can be chosen for their ability to attack selected targets and leave crops and other plants untouched. In contrast, some of the most effective chemicals kill virtually all the plants they come in contact with, sparing only those that are naturally resistant or have been genetically modified for resistance. Furthermore, a number of biological agents can be administered only once, after which no added applications are needed. Chemicals typically must be used several times per growing season.

The word ‘clog’ in bold is closest in meaning to

A. drain

B. grow along

C. obstruct  

D. float on

1
11 tháng 10 2018

Đáp án C

 Từ ‘clog’ in đậm gần nghĩa nhất với

 A. cống                      

 B. phát triển dọc theo            

 C. cản trở                   

 D. nổi trên

 ‘clog’ = obstruct: cản trở, làm tắc nghẽn

 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 30 to 37.  Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds – any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede farming. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They...
Đọc tiếp

 

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 30 to 37.

  Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds – any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede farming. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They compete for sunlight, nutrients, and water with useful plants.

The global need for weed control had been answered mainly by the chemical industry. Its herbicides are effective and sometimes necessary, but some pose serious problems, particularly if misused. Toxic compounds threaten animal and public health when they accumulate in food plants, groundwater, and drinking water. They also harm workers who apply them.

  In recent years, the chemical industry has introduced several herbicides that are more ecologically sound. Yet new chemicals alone cannot solve the world’s weed problems. Hence, scientists are exploring the innate weed-killing powers of living organisms, primarily insects and microorganisms.

The biological agents now in use are environmentally benign and are harmless to humans. They can be chosen for their ability to attack selected targets and leave crops and other plants untouched. In contrast, some of the most effective chemicals kill virtually all the plants they come in contact with, sparing only those that are naturally resistant or have been genetically modified for resistance. Furthermore, a number of biological agents can be administered only once, after which no added applications are needed. Chemicals typically must be used several times per growing season.

Which of the following best describes the organization of the passage

 

A. Two possible causes of a phenomenon are compared.

B. A problem is described and possible solutions are discussed.

C. A general idea is introduced and several specific examples are given.

D. A recommendation is analysed and rejected 

1
24 tháng 3 2019

Đáp án C

Câu nào sau đây mô tả đúng nhất việc tổ chức đoạn văn?

 A. Hai nguyên nhân có thể xảy ra của một hiện tượng được so sánh.

 B. Một vấn đề được mô tả và các giải pháp có thể năng được thảo luận.

 C. Một ý tưởng chung được giới thiệu và một số ví dụ cụ thể được đưa ra.

D. Một khuyến nghị được phân tích và bác bỏ.

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 30 to 37.  Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds – any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede farming. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They...
Đọc tiếp

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 30 to 37.

  Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds – any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede farming. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They compete for sunlight, nutrients, and water with useful plants.

The global need for weed control had been answered mainly by the chemical industry. Its herbicides are effective and sometimes necessary, but some pose serious problems, particularly if misused. Toxic compounds threaten animal and public health when they accumulate in food plants, groundwater, and drinking water. They also harm workers who apply them.

  In recent years, the chemical industry has introduced several herbicides that are more ecologically sound. Yet new chemicals alone cannot solve the world’s weed problems. Hence, scientists are exploring the innate weed-killing powers of living organisms, primarily insects and microorganisms.

The biological agents now in use are environmentally benign and are harmless to humans. They can be chosen for their ability to attack selected targets and leave crops and other plants untouched. In contrast, some of the most effective chemicals kill virtually all the plants they come in contact with, sparing only those that are naturally resistant or have been genetically modified for resistance. Furthermore, a number of biological agents can be administered only once, after which no added applications are needed. Chemicals typically must be used several times per growing season.

The word ‘applications’ in bold could best be replaced by which of the following?

A. treatments

B. requests

C. special purposes

D. qualifications

1
10 tháng 11 2018

Đáp án A

 Từ ‘applications’ in đậm có thể được thay thế bằng từ nào sau đây?

 A. phương pháp điều trị                     

 B. yêu cầu

 C. mục đích đặc biệt                          

D. trình độ

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 30 to 37.  Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds – any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede farming. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They...
Đọc tiếp

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 30 to 37.

  Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds – any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede farming. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They compete for sunlight, nutrients, and water with useful plants.

The global need for weed control had been answered mainly by the chemical industry. Its herbicides are effective and sometimes necessary, but some pose serious problems, particularly if misused. Toxic compounds threaten animal and public health when they accumulate in food plants, groundwater, and drinking water. They also harm workers who apply them.

  In recent years, the chemical industry has introduced several herbicides that are more ecologically sound. Yet new chemicals alone cannot solve the world’s weed problems. Hence, scientists are exploring the innate weed-killing powers of living organisms, primarily insects and microorganisms.

The biological agents now in use are environmentally benign and are harmless to humans. They can be chosen for their ability to attack selected targets and leave crops and other plants untouched. In contrast, some of the most effective chemicals kill virtually all the plants they come in contact with, sparing only those that are naturally resistant or have been genetically modified for resistance. Furthermore, a number of biological agents can be administered only once, after which no added applications are needed. Chemicals typically must be used several times per growing season.

Which of the following terms does the author define in the first paragraph?

A. grazing area

B. weeds

C. nutrients

D. wildlife habitats

1
5 tháng 12 2018

Đáp án B

 Thuật ngữ nào sau đây được định nghĩa trong đoạn đầu tiên?

 A. khu chăn thả                                             B. cỏ dại

C. chất dinh dưỡng                                         D. môi trường sống động vật hoang dã

Thông tin: weeds – any plants that thrive where they are unwanted. (cỏ dại - bất kỳ loài cây nào phát triển nơi chúng không cần thiết.)

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 30 to 37.  Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds – any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede farming. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They...
Đọc tiếp

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 30 to 37.

  Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds – any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede farming. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They compete for sunlight, nutrients, and water with useful plants.

The global need for weed control had been answered mainly by the chemical industry. Its herbicides are effective and sometimes necessary, but some pose serious problems, particularly if misused. Toxic compounds threaten animal and public health when they accumulate in food plants, groundwater, and drinking water. They also harm workers who apply them.

  In recent years, the chemical industry has introduced several herbicides that are more ecologically sound. Yet new chemicals alone cannot solve the world’s weed problems. Hence, scientists are exploring the innate weed-killing powers of living organisms, primarily insects and microorganisms.

The biological agents now in use are environmentally benign and are harmless to humans. They can be chosen for their ability to attack selected targets and leave crops and other plants untouched. In contrast, some of the most effective chemicals kill virtually all the plants they come in contact with, sparing only those that are naturally resistant or have been genetically modified for resistance. Furthermore, a number of biological agents can be administered only once, after which no added applications are needed. Chemicals typically must be used several times per growing season.

The word ‘innate’ in bold is closest in meaning to 

A. effective 

B. natural

C. active

D. organic

1
19 tháng 10 2018

Đáp án B

 Từ ‘innate’ in đậm gần nghĩa nhất với

 A. hiệu quả                  B. tự nhiên                  C. năng động              D. hữu cơ

 ‘innate’ = natural: tự nhiên, bẩm sinh

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 30 to 37.  Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds – any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede farming. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They...
Đọc tiếp

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 30 to 37.

  Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds – any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede farming. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They compete for sunlight, nutrients, and water with useful plants.

The global need for weed control had been answered mainly by the chemical industry. Its herbicides are effective and sometimes necessary, but some pose serious problems, particularly if misused. Toxic compounds threaten animal and public health when they accumulate in food plants, groundwater, and drinking water. They also harm workers who apply them.

  In recent years, the chemical industry has introduced several herbicides that are more ecologically sound. Yet new chemicals alone cannot solve the world’s weed problems. Hence, scientists are exploring the innate weed-killing powers of living organisms, primarily insects and microorganisms.

The biological agents now in use are environmentally benign and are harmless to humans. They can be chosen for their ability to attack selected targets and leave crops and other plants untouched. In contrast, some of the most effective chemicals kill virtually all the plants they come in contact with, sparing only those that are naturally resistant or have been genetically modified for resistance. Furthermore, a number of biological agents can be administered only once, after which no added applications are needed. Chemicals typically must be used several times per growing season.

With what topic does this passage primarily deal?

A. The dangers of toxic chemicals.

B. A proposal to ban the use of all herbicides.

C. The importance of the chemical industry.

D. Advantages of biological agents over chemical ones.

1
13 tháng 10 2019

Đáp án D

Chủ đề nào đoạn văn này chủ yếu giải quyết?

A. Sự nguy hiểm của hóa chất độc hại.

B. Đề xuất cấm sử dụng tất cả các chất diệt cỏ.

C. Tầm quan trọng của ngành công nghiệp hoá chất.

D. Ưu điểm của tác nhân sinh học hơn những hóa chất.

Read the following passage and mark the letter A, B, tr or I) to indicate the correct answer to each of the questions from 36 to 42.Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds - any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede fanning. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They compete for sunlight,...
Đọc tiếp

Read the following passage and mark the letter A, B, tr or I) to indicate the correct answer to each of the questions from 36 to 42.

Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds - any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede fanning. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They compete for sunlight, nutrients, and water with useful plants.

The global need for weed control had been answered mainly by the chemical industry. Its herbicides are effective and sometimes necessary, but some pose serious problems, particularly if misused. Toxic compounds threaten animal and public health when they accumulate in food plants, groundwater, and drinking water. They also harm workers who apply them.

In recent years, the chemical industry has introduced several herbicides that are more ecologically sound. Yet new chemicals alone cannot solve the world's weed problems. Hence, scientists are exploring the innate weed-killing powers of living organisms, primarily insects and microorganisms.

The biological agents now in use are environmentally benign and are harmless to humans. They can be chosen for their ability to attack selected targets and leave crops and other plants untouched. In contrast, some of the most effective chemicals kill virtually all the plants they come in contact with, sparing only those that are naturally resistant or have been genetically modified for resistance. Furthermore, a number of biological agents can be administered only once, after which no added applications are needed. Chemicals typically must be used several times per growing season.

Which of the following is NOT given as an advantage of using biological agents over chemical herbicides?

A. They are safer for workers.

B. They are less likely to destroy desirable plants.

C. They are more easily available.

D. They do not have to be used as often.

1
4 tháng 3 2017

Đáp án C

Dịch nghĩa: Câu nào sau đây không phải là một lợi ích của việc sử dụng tác nhân sinh học so với tác nhân hóa học?

A. An toàn cho sử dụng                               B. chúng ít khả năng làm hại những cây tốt

C. chúng có sẵn hơn.                                   D. Chúng không cần được sử dụng thường xuyên.

Giải thích: Phương án A, B và D đều được để cập trong bài, nhưng câu hỏi hỏi về KHÔNG nên chúng ta chọn C. Thông tin nằm ở đoạn 4 “The biological agents now in use are environmentally benign and are harmless to humans. They can be chosen for their ability to attack selected targets and leave crops and other plants untouched. Furthermore, a number of biological agents can be administered only once”

Read the following passage and mark the letter A, B, tr or I) to indicate the correct answer to each of the questions from 36 to 42.Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds - any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede fanning. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They compete for sunlight,...
Đọc tiếp

Read the following passage and mark the letter A, B, tr or I) to indicate the correct answer to each of the questions from 36 to 42.

Humans have struggled against weeds since the beginnings of agriculture. Marring our gardens is one of the milder effects of weeds - any plants that thrive where they are unwanted. They clog waterways, destroy wildlife habitats, and impede fanning. Their spread eliminates grazing areas and accounts for one-third of all crop loss. They compete for sunlight, nutrients, and water with useful plants.

The global need for weed control had been answered mainly by the chemical industry. Its herbicides are effective and sometimes necessary, but some pose serious problems, particularly if misused. Toxic compounds threaten animal and public health when they accumulate in food plants, groundwater, and drinking water. They also harm workers who apply them.

In recent years, the chemical industry has introduced several herbicides that are more ecologically sound. Yet new chemicals alone cannot solve the world's weed problems. Hence, scientists are exploring the innate weed-killing powers of living organisms, primarily insects and microorganisms.

The biological agents now in use are environmentally benign and are harmless to humans. They can be chosen for their ability to attack selected targets and leave crops and other plants untouched. In contrast, some of the most effective chemicals kill virtually all the plants they come in contact with, sparing only those that are naturally resistant or have been genetically modified for resistance. Furthermore, a number of biological agents can be administered only once, after which no added applications are needed. Chemicals typically must be used several times per growing season.

Which of the following statements about the use of chemical agents as herbicides would the author most likely agree?

A. It is occasionally required

B. It is safe but inefficient.

C. It should be increased

D. It has become more dangerous recently.

1
16 tháng 6 2018

Đáp án A

Dịch nghĩa: Câu nào nói về việc sử dụng chất hóa học như thuốc diệt cỏ mà tác giả dễ đồng ý nhất?

A. Thỉnh thoảng nó được cần đến                         B. Nó an toàn nhưng không hiệu quả.

C. Nó cần được tăng lên.                                      D. Dạo này nó đã trở nên nguy hiểm hơn.

Giải thích: Thông tin nằm ở đoạn 1 “Its herbicides are effective and sometimes necessary, but some pose serious problems”