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Câu hỏi:

27/08/2021 118

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 

Đáp án chính xác

C. dividing

D. replacin

Trả lời:

verified Giải bởi qa.haylamdo.com

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.

Câu trả lời này có hữu ích không?

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