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Câu hỏi:

17/07/2024 121

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.

Đáp án chính xác

D. A recommendation is analyzed and rejected.

Trả lời:

verified Giải bởi qa.haylamdo.com

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.

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