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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 best describes the organization of the passage?

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

B. Two possible causes of a phenomenon are compared

C. A problem is described and possible solutions are discussed

D. A recommendation is analyzed and rejected

1
24 tháng 4 2018

Đáp án C

Dịch nghĩa: Phương án nào miêu tả cấu trúc bài viết phù hợp nhất?

A. Một ý kiến chung được đưa ra và một vài ví dụ cụ thể được trình bày.

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

C. Một vấn đề được trình bày và những giải pháp được bàn đến.

D. Một gợi ý được phân tích và phản đối.

Giải thích: Vấn đề cỏ dại mọc được bàn đến và giải pháp bàn đến là tác nhân hóa học và sinh học.

Bài dịch              

Con người đã đấu tranh với cỏ dại từ khi bắt đầu ngành nông nghiệp. Làm hư hại vườn tược là một trong những tác hại còn nhẹ của cỏ dại - bất kỳ loài cây nào mọc lên ở chỗ mà chúng không được mong đợi. Chúng làm tắc nghẽn thủy lợi, phá hủy môi trường sống của động vật hoang dã, và cản trở nông nghiệp. Sự lan rộng của chúng loại bỏ các vùng chăn thả và chiếm một phần ba nguyên nhân của thiệt hại mùa vụ. Chúng cạnh tranh về ánh sáng, chất dinh dưỡng, và nước với những thực vật hữu ích.

Việc cần thiết phải kiểm soát cỏ dại toàn cầu đã được trả lời bởi ngành công nghiệp hóa chất,

thuốc diệt có hiệu quả và đôi khi cần thiết, nhưng một số vấn đề nghiêm trọng xảy ra, đặc biệt nếu sử dụng không đúng cách. Các hợp chất độc hại đe dọa động vật và sức khỏe cộng đồng khi chúng tích tụ trong các nhà máy thực phẩm, nước ngầm và nước uống. Chúng cũng gây tổn hại cho người lao động sử dụng chúng.

Trong những năm gần đây, ngành công nghiệp hóa học đã giới thiệu một số loại thuốc diệt cỏ thân thiện với hệ sinh thái hơn. Tuy nhiên, chỉ có hóa chất thì không thể giải quyết được vấn để cỏ dại trên toàn thế giới. Do đó, các nhà khoa học đang khám phá khả năng diệt có tự nhiên của các sinh vật sống, chủ yếu là côn trùng và vi sinh vật.

Các tác nhân sinh học đang sử dụng đầu thân thiện với môi trường và không có hại cho con người. Chúng có thể được lựa chọn tùy theo khả năng có thế tấn công các mục tiêu được ngắm đến và giữ lại các loại cây trồng mà không gây ảnh hưởng. Ngược lại, một số hóa chất hiệu quả nhất thì lại giết chết hầu như tất cả những cây mà chúng tiếp xúc với, chỉ chừa lại những cây kháng thuốc tự nhiên hoặc đã được biến đổi gen để kháng thuốc. Hơn nữa, một số tác nhân sinh học có thế chỉ cần dùng một lần duy nhất, sau đó không cần thiết phải dùng thêm. Còn hóa chất thường phải sử dụng nhiều lần trong suốt thời kì phát triển.

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
1 tháng 11 2019

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.

Question 40: 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
13 tháng 11 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.

Question 39: 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
7 tháng 7 2019

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”

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
26 tháng 3 2019

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”

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.

Question 42: Which of the following best describes the organization of the passage?

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

B. Two possible causes of a phenomenon are compared.

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

D. A recommendation is analyzed and rejected.

1
12 tháng 4 2019

Đáp án C

Dịch nghĩa: Phương án nào miêu tả cấu trúc bài viết phù hợp nhất?

A. Một ý kiến chung được đưa ra và một vài ví dụ cụ thể được trình bày.

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

C. Một vấn đề được trình bày và những giải pháp được bàn đến.

D. Một gợi ý được phân tích và phản đối.

Giải thích: Vấn đề cỏ dại mọc được bàn đến và giải pháp bàn đến là tác nhân hóa học và sinh học.

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.

Question 37: The word "marring" in bold is closest in meaning to ________.

A. spoiling

B. planting

C. dividing

D. replacing

1
7 tháng 2 2018

Đáp án A

Dịch nghĩa: Từ “marring” - làm hư hại in đậm gần nghĩa nhất với ___________.

A. làm tổn hại              B. trồng                          C. phân chia           D. thay thế

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.

 

The word "marring" in bold is closest in meaning to ________.

A. spoiling

B. planting 

C. dividing

D. replacing

1
22 tháng 8 2017

Đáp án A

Dịch nghĩa: Từ “marring” - làm hư hại in đậm gần nghĩa nhất với ___________.

A. làm tổn hại

B. trồng

C. phân chia

D. thay thế

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.

 

The passage suggests that learning to speak and learning to ride a bicycle are _________.

A.basically the same as learning other skills

B. more important than other skills

C. basically different from learning adult skills

D. not really important skills

1
18 tháng 2 2019

Đáp án A

Dịch nghĩa: Đoạn văn gợi ý là học nói và học đạp xe __________.

A. căn bản thì cũng giống như học các kĩ năng khác

B. quan trọng hơn các kĩ năng khác

C. căn bản là khác so với học các kĩ năng người lớn

D. không hẳn là những kĩ năng quan trọng

Giải thích: Thông tin nằm ở đoạn “In the same way, children learn all the other things they learn to do without being taught — to talk, run, climb, whistle, ride a bicycle”. Tác giá xếp các việc kia trong một nhóm những thứ phải học mà không cần được dạy.

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.

 

The word "complicated" in the third paragraph is closest in meaning to ___________.

A. comfortable

B. competitive

C. complex

D. compliment

1
2 tháng 8 2019

Đáp án C

Dịch nghĩa: Từ “complicated”- phức tạp ở đoạn 3 gần nghĩa nhất __________.

A. thoải mái

B. cạnh tranh

C. phức tạp

D. lời khen