Câu hỏi:
31/03/2020 189Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer for each of the questions
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 ‘clog’ in bold is closest in meaning to
Đáp án chính xác
Câu hỏi trong đề:
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Trả lời:
Giải bởi Vietjack
Đáp án C
Từ ‘clog’ in đậm gần nghĩa nhất với
A. cống
B. phát triển dọc theo
C. cản trở
D. nổi trên
=> đáp án C
‘clog’ = obstruct: cản trở, làm tắc nghẽn
Nhà sách VIETJACK:
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 1:
Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.
We managed to get to school in time despite the heavy rain
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31/03/2020
45,568
Câu 2:
Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions
Vietnam exports a lot of rice is grown mainly in the south of the country.
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31/03/2020
43,029
Câu 3:
Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions
He passed the exam with high scores, that made his parents happy
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31/03/2020
22,637
Câu 4:
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.
- "Excuse me. Where’s the parking lot?" - “___________”
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31/03/2020
20,296
Câu 5:
Mark the letter A, B, C, or D on you answer sheet to indicate the sentence that best combines each pair of sentences in the following questions
Mary loved her stuffed animal when she was young. She couldn’t sleep without it.
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31/03/2020
16,106
Câu 6:
He had changed so much since the last time we met that I ___________ him
Xem đáp án »
31/03/2020
10,874
Câu 7:
___________ these books to the library, as they will soon overdue.
Xem đáp án »
31/03/2020
9,760
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