Câu hỏi:
16/03/2020 553Read 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 35 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 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 is NOT given as an advantage of using biological agents over chemical herbicides?
Sách mới 2k7: 30 đề đánh giá năng lực DHQG Hà Nội, Tp. Hồ Chí Minh, BKHN 2025 mới nhất (600 trang - chỉ từ 160k).
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Trả lời:
Đáp án C
Kiến thức: Đọc hiểu
Giải thích:
Điều nào dưới đây KHÔNG được đưa ra như là một lợi ích của việc sử dụng các nhân tố sinh học thay vì nhân tố hóa học?
A. Chúng an toàn hơn cho các công nhân.
B. Chúng có thể phá hủy các thực vật mong muốn.
C. Chúng có sẵn dễ dàng hơn.
D. Chúng không cần phải được sử dụng thường xuyên.
Thông tin: 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.
Tạm dịch: Các chất sinh học được sử dụng hiện nay đều vô hại với môi trường và con người. Chúng có thể được chọn nhờ khả năng diệt cỏ trong khu vực định trước và không gây ảnh hưởng đến thực vật xung quanh. Trái lại, một vài loại chất hoá học hiệu quả nhất sẽ gần như diệt hết toàn bộ thực vật dính thuốc, chỉ trừ một vài loài kháng thuốc tự nhiên hoặc được biến đổi gen với sức đề kháng tốt hơn. Không chỉ vậy, một lượng lớn chất sinh học chỉ cần phun một lần, sau đó không cần thêm bước xử lí nào khác. Còn chất hoá học thường phải được phun vài lần mỗi mùa vụ.
Đã bán 152
Đã bán 114
Đã bán 132
Đã bán 47
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 1:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
________ my parents gave me the fish tank
Câu 2:
Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.
Such problems as haste and inexperience are a universal feature of youth.
Câu 3:
Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
Although she is intelligent, she doesn’t do well at school.
Câu 4:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
With so much ______, I’m lucky to be in work.
Câu 5:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
The number of working women in China __________ from 49% in 1980 to nearly 65% today.
Câu 6:
Mark the letter A, B, C, or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.
Sue: “Can you help me with my essay?”
Robert: “________________________”.
Câu 7:
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
You should read this novel. It has been _______ recommended by all the critics.
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