Thứ sáu, 22/11/2024
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Câu hỏi:

02/07/2024 219

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 35 to 42 

     Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger to the ground and depositing a tiny amount of trail pheromone – a mixture of chemicals that delivers diverse messages as the context changes. These trails incorporate no directional information and may be followed by other ants in either direction. 

     Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Atta Texana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth. 

          The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space.  In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space. The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail

According to the passage, the highest amount of pheromone vapor is found _____ 

A. in the receptors of the ants

B. just above the trail 

Đáp án chính xác

C. in the source of food

D. under the soil along the trail 

Trả lời:

verified Giải bởi Vietjack

Theo đoạn văn, lượng hơi pheromone cao nhất được tìm thấy _____

A. trong các thụ thể của kiến

B. ngay phía trên đường mòn

C. trong nguồn thức ăn

D. dưới đất dọc theo đường mòn

Đáp án B

Thông tin ở đoạn sau: “The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space.” (Hơi ẩm của chất chi phối đang bay hơi trên dấu vết chỉ dẫn cho một con kiến dọc đường đi và con kiến này tìm ra kí hiệu này cùng với các thụ quan trên các râu của chúng. Chất chi phối dấu vết sẽ làm bay hơi để cung cấp sự tập hợp cao nhất của các hơi ngay phía trên dấu vết, ở nơi được gọi là không gian dấu vết.)

Câu trả lời này có hữu ích không?

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Câu 2:

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions

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Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions

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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

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Câu 5:

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions

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Câu 6:

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

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Câu 8:

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

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Câu 9:

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions

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Câu 10:

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

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Câu 11:

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions

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Câu 12:

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions

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Câu 13:

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

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Câu 14:

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions

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Câu 15:

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 34 

     Martin Luther King, Jf., is well- known for his work in civil rights and for his many famous speeches, among which is his moving “I have a dream” speech. But fewer people know much about King’s childhood. M.L., as he was called, was born in 1929 in Atlanta, Georgia, at the home of his maternal grandfather. M.L.’s grandfather purchased their home on Auburn Avenue in 1909, twenty years before M.L was born. His grandfather allowed the house to be used as a meeting place for a number of organizations dedicated to the education and social advancement of blacks. M.L. grew up in the atmosphere, with his home being used as a community gathering place, and was no doubt influenced by it. 

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          Even in the face of Atlanta’s segregation, the district thrived. Dr. King never forgot the community spirit he had known as a child, nor did he forget the racial prejudice that was a huge barrier keeping black Atlantans from mingling with whites

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