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, ...
Nguyễn Thanh Thảo | Chat Online | |
01/09 22:24:49 (Tiếng Anh - Lớp 12) |
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?
Lựa chọn một trả lời để xem Đáp án chính xác Báo sai đáp án hoặc câu hỏi |
A. It is occasionally required. 0 % | 0 phiếu |
B. It is safe but inefficient. 0 % | 0 phiếu |
C. It should be increased. 0 % | 0 phiếu |
D. It has become more dangerous recently. 0 % | 0 phiếu |
Tổng cộng: | 0 trả lời |
Tags: 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.,Question 39: Which of the following statements about the use of chemical agents as herbicides would the author most likely agree?
Trắc nghiệm liên quan
- 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 ... (Tiếng Anh - Lớp 12)
- 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 ... (Tiếng Anh - Lớp 12)
- 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 ... (Tiếng Anh - Lớp 12)
- Read the following passage and mark the letter A, B, C or D to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35. One of the hottest topics on the international development agenda is how to harness the power ... (Tiếng Anh - Lớp 12)
- Read the following passage and mark the letter A, B, C or D to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35. One of the hottest topics on the international development agenda is how to harness the power ... (Tiếng Anh - Lớp 12)
- Read the following passage and mark the letter A, B, C or D to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35. One of the hottest topics on the international development agenda is how to harness the power ... (Tiếng Anh - Lớp 12)
- Read the following passage and mark the letter A, B, C or D to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35. One of the hottest topics on the international development agenda is how to harness the power ... (Tiếng Anh - Lớp 12)
- Read the following passage and mark the letter A, B, C or D to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35. One of the hottest topics on the international development agenda is how to harness the power ... (Tiếng Anh - Lớp 12)
- Mark the letter A, B, C or D to indicate the sentence that best combines each pair of sentences in the following questions. Question 30. People on Jeju Island have a unique culture. (Tiếng Anh - Lớp 12)
- Mark the letter A, B, C or D to indicate the sentence that best combines each pair of sentences in the following questions. Question 29: The student next to me kept chewing gum. That bothered me a lot. (Tiếng Anh - Lớp 12)
Trắc nghiệm mới nhất
- Tính đến năm 2020, Liên hợp quốc có bao nhiêu thành viên? (Địa lý - Lớp 11)
- Một khối gỗ hình hộp chữ nhật có các kích thước dài 10 cm, rộng 5 cm và chiều cao 4 cm. Đặt khối gỗ trên bàn theo cách nào thì áp suất gây ra trên bàn nhỏ nhất? (Khoa học tự nhiên - Lớp 8)
- Khối lượng nước trong ống đong được tính theo công thức (Khoa học tự nhiên - Lớp 8)
- Việt Nam là thành viên của các tổ chức liên kết khu vực nào sau đây? (Địa lý - Lớp 11)
- Điền vào chỗ trống: "Khi biết khối lượng riêng của một vật, ta có thể biết vật đó được cấu tạo bằng chất gì bằng cách đối chiếu với bảng ... của các chất." (Khoa học tự nhiên - Lớp 8)
- Tổ chức liên kết khu vực nào sau đây có sự tham gia của các nước ở nhiều châu lục khác nhau nhất? (Địa lý - Lớp 11)
- Đốt cháy 1,8 g kim loại M, thu được 3,4 g một oxide. Công thức của oxide đó là (Khoa học tự nhiên - Lớp 8)
- Công thức hoá học của potassium hydroxide là (Khoa học tự nhiên - Lớp 8)
- Công thức hoá học của acid có trong dịch vị dạ dày là (Khoa học tự nhiên - Lớp 8)
- Nước muối sinh lí (dung dịch NaCl 0,9%) được sử dụng nhiều trong y học và trong cuộc sống hàng ngày. Để pha chế 500g nước muối sinh lí ta cần: (Khoa học tự nhiên - Lớp 8)