Câu hỏi:
20/07/2024 159Read the following passage and mark the letter A, B, C or B on your answer sheet to indicate the correct answer to each of the questions from 30 to 37.
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 Line 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, why do ants use different compounds as trail pheromones?
A. To reduce their sensitivity to some chemicals
B. To attract different types of ants
C. To protect their trail from other species
D. To indicate how far away the food is
Trả lời:
Đáp án C
Theo đoạn văn này, tại sao kiến lại sử dụng các hợp chất khác nhau như dấu vết pheromones?
A. Để giảm độ nhạy cảm của chúng đối với một số hóa chất
B. Thu hút các loại kiến khác nhau
C. Để bảo vệ dấu vết của chúng khỏi các loài khác
D. Để chỉ ra cách thức ăn bao xa
Dẫn chứng: a food trail has to be kept secret from members of other species.
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.
There was a lot of traffic but we managed _________ to the airport in time.
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.
Women usually don’t shake hands when being _________.
Câu 3:
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
_________ the flight delay, they didn’t attend the conference.
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.
In the past, the trip _________ very rough and often dangerous, but things _________ a great deal in the last hundred and fifty years
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.
There will be powerful network of computers which may come from a single computing _________ that is worn on or in the body.
Câu 6:
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.
“Would you like something to drink?” he asked.
Câu 7:
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.
I lost contact with my family and friends since I lost my mobile phone.
Câu 8:
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 38 to 42.
Body postures and movements are frequently indicators of self-confidence, energy, fatigue, or status. Cognitively, gestures operate to clarify, contradict, or replace verbal messages. Gestures also serve an important function with regard to regulating the flow of conversation. For example, if a student is talking about something in front of the class, single nods of the head from the teacher will likely cause that student to continue and perhaps more elaborate. Postures as well as gestures are used to indicate attitudes, status, affective moods, approval, deception, warmth, arid other variables related to conversation interaction.
The saying “A picture is worth a thousand words” well describes the meaning of facial expressions. Facial appearance – including wrinkles, muscle tone, skin coloration, and eye color-offers enduring cues that reveal information about age, sex, race, ethnic origin, and status.
A less permanent second set of facial cues-including length of hair, hairstyle, cleanliness, and facial hair-relate to an individual’s idea of beauty. A third group of facial markers are momentary expressions that signal that cause changes in the forehead, eyebrows, eyelids, cheeks, nose, lips, and chin, such as raising the eyebrows, wrinkling the brow, curling the lip.
Some facial expressions are readily visible, while others are fleeting. Both types can positively or negatively reinforce the spoken words and convey cues concerning emotions and attitudes.
How many categories of facial expressions are mentioned?
Câu 9:
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.
“It’s kind of you to give me a ride to the station?” - “ _________ ”
Câu 10:
Mark the letter A, B, C or D on your answer sheet to indicate the word(s) CLOSET in meaning to the underlined word(s) in each of the following questions.
Ralph Nader was the most prominent leader of the U.S consumer protection movement.
Câu 11:
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Most deserts are enormous sandy areas.
Câu 12:
Mark the letter A, B, C or D on your answer sheet to indicate the word whose underlined part differs from the other three III pronunciation In each of the following questions.
Câu 13:
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 38 to 42.
Body postures and movements are frequently indicators of self-confidence, energy, fatigue, or status. Cognitively, gestures operate to clarify, contradict, or replace verbal messages. Gestures also serve an important function with regard to regulating the flow of conversation. For example, if a student is talking about something in front of the class, single nods of the head from the teacher will likely cause that student to continue and perhaps more elaborate. Postures as well as gestures are used to indicate attitudes, status, affective moods, approval, deception, warmth, arid other variables related to conversation interaction.
The saying “A picture is worth a thousand words” well describes the meaning of facial expressions. Facial appearance – including wrinkles, muscle tone, skin coloration, and eye color-offers enduring cues that reveal information about age, sex, race, ethnic origin, and status.
A less permanent second set of facial cues-including length of hair, hairstyle, cleanliness, and facial hair-relate to an individual’s idea of beauty. A third group of facial markers are momentary expressions that signal that cause changes in the forehead, eyebrows, eyelids, cheeks, nose, lips, and chin, such as raising the eyebrows, wrinkling the brow, curling the lip.
Some facial expressions are readily visible, while others are fleeting. Both types can positively or negatively reinforce the spoken words and convey cues concerning emotions and attitudes.
Gestures _________.
Câu 14:
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.
There has been insufficient rainfall over the past two years, and farmers are having trouble.
Câu 15:
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
We depend on species diversity to provide food, clean air and water.