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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.

The response of most animals when suddenly faced with a predator is to flee. Natural  selection has acted in a variety of ways in different species to enhance the efficacy of the behaviors, known as "flight behaviors" or escape behaviors that are used by prey in fleeing predators. Perhaps the most direct adaptation is enhanced light speed and agility.

Adaptations for speed, however, are likely to require sacrifices biter attributes, so we might expect only some species to adopt a simple fast flight strategy. Another way of enhancing the effectiveness of flight is to move in an erratic and unpredictable way. Many species, like ptarmigans, snipes, and various antelopes and gazelles, flee from predators in a characteristic zigzag fashion. Rapid unexpected changes in flight direction make it difficult for a predator to track prey.  In some species, like the European hare, erratic zigzag flight might be more effective in the  presence of predators that are faster than they are and straight flight more effective against predators that are slower. One observation that supports this suggestion is the recorded tendency for slow-flying black-beaded gulls, which are normally able to escape predators by means of direct flight, to show frequent changes in flight direction when they spot a peregrine falcon (peregrines are adept at capturing flying birds).

A quite different way of enhancing escape by flight is to use so-called "flash" behavior. Here, the alarmed prey flees for a short distance and then "freezes." Some predators are unexcited by immobile prey, and a startling flash of activity followed by immobility may confuse them. "Flash" behavior is used in particular by frogs and orthopteran insects, which make conspicuous jumps and then sit immobile. In some species, "flash" behavior is enhanced by the display of bright body markings. Good examples of insects with colorful markings are the red and yellow underwing moths. At rest, both species are a cryptic brown color. When they fly, however, brightly colored hind wings are exposed, which render the moths highly conspicuous. Similarly, some frogs and lizards have brightly colored patches or frills that may serve a “flash" function when they move quickly. Some species even appear to possess "flash" sounds. The loud buzzing and clicking noises made by some grasshoppers when they jump may serve to emphasize the movement

The behaviour of black-beaded gulls is most comparable to that of________

A. gazelles

B. frogs

C. peregrine falcons

D. European hares

1
13 tháng 4 2017

Đáp án D
Đoạn 2: “One observation that supports this suggestion is the recorded tendency for slow-flying blackbeaded gulls, which are normally able to escape predators by means of direct flight, to show frequent changes in flight direction when they spot a peregrine falcon.” = Một quan sát ủng hộ ý kiến này là một
xu hướng ghi nhận được về loài mòng biển đầu đen bay chậm, loài mà thường có khả năng thoát khỏi
động vật ăn thịt bằng đường bay thẳng, cũng cho thấy sự thay đổi thường xuyên trong hướng bay khi
chúng gặp một con chim ưng peregrine. => “this suggestion” là chỉ hiện tượng thay đổi đường bay
(thẳng hoặc zigzag) của loài thỏ rửng châu Âu (European hare) đã được đề cập ở trên

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.The response of most animals when suddenly faced with a predator is to flee. Natural  selection has acted in a variety of ways in different species to enhance the efficacy of the behaviors, known as "flight behaviors" or escape behaviors that are used by prey in fleeing predators. Perhaps the most direct adaptation is enhanced light speed and...
Đọc tiếp

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.

The response of most animals when suddenly faced with a predator is to flee. Natural  selection has acted in a variety of ways in different species to enhance the efficacy of the behaviors, known as "flight behaviors" or escape behaviors that are used by prey in fleeing predators. Perhaps the most direct adaptation is enhanced light speed and agility.

Adaptations for speed, however, are likely to require sacrifices biter attributes, so we might expect only some species to adopt a simple fast flight strategy. Another way of enhancing the effectiveness of flight is to move in an erratic and unpredictable way. Many species, like ptarmigans, snipes, and various antelopes and gazelles, flee from predators in a characteristic zigzag fashion. Rapid unexpected changes in flight direction make it difficult for a predator to track prey.  In some species, like the European hare, erratic zigzag flight might be more effective in the  presence of predators that are faster than they are and straight flight more effective against predators that are slower. One observation that supports this suggestion is the recorded tendency for slow-flying black-beaded gulls, which are normally able to escape predators by means of direct flight, to show frequent changes in flight direction when they spot a peregrine falcon (peregrines are adept at capturing flying birds).

A quite different way of enhancing escape by flight is to use so-called "flash" behavior. Here, the alarmed prey flees for a short distance and then "freezes." Some predators are unexcited by immobile prey, and a startling flash of activity followed by immobility may confuse them. "Flash" behavior is used in particular by frogs and orthopteran insects, which make conspicuous jumps and then sit immobile. In some species, "flash" behavior is enhanced by the display of bright body markings. Good examples of insects with colorful markings are the red and yellow underwing moths. At rest, both species are a cryptic brown color. When they fly, however, brightly colored hind wings are exposed, which render the moths highly conspicuous. Similarly, some frogs and lizards have brightly colored patches or frills that may serve a “flash" function when they move quickly. Some species even appear to possess "flash" sounds. The loud buzzing and clicking noises made by some grasshoppers when they jump may serve to emphasize the movement

The hind wings of red and yellow underwing moths function in a way that is most similar to_________

A. the hind wings of peregrine falcons

B. the zigzag flight of European hares

C. the colored patches on frogs

D. the clicking of grasshoppers

1
3 tháng 1 2020

Đáp án C
Đoạn 3: “When they fly, however, brightly colored hind wings are exposed, which render the moths highly conspicuous. Similarly, some frogs and lizards have brightly colored patches
or frills that may serve a “flash" function when they move quickly.” = Khi chúng bay, dù vậy,
màu sáng ở cánh sau được lộ diện, điều này là cho bướm đêm rất dễ thấy. Tương tự như thế,
một vài loài cáo và thằn lằn có những đốm và diềm có thể làm chức năng “chớp sáng” khi
chúng di chuyển nhanh

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.The response of most animals when suddenly faced with a predator is to flee. Natural  selection has acted in a variety of ways in different species to enhance the efficacy of the behaviors, known as "flight behaviors" or escape behaviors that are used by prey in fleeing predators. Perhaps the most direct adaptation is enhanced light speed and...
Đọc tiếp

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.

The response of most animals when suddenly faced with a predator is to flee. Natural  selection has acted in a variety of ways in different species to enhance the efficacy of the behaviors, known as "flight behaviors" or escape behaviors that are used by prey in fleeing predators. Perhaps the most direct adaptation is enhanced light speed and agility.

Adaptations for speed, however, are likely to require sacrifices biter attributes, so we might expect only some species to adopt a simple fast flight strategy. Another way of enhancing the effectiveness of flight is to move in an erratic and unpredictable way. Many species, like ptarmigans, snipes, and various antelopes and gazelles, flee from predators in a characteristic zigzag fashion. Rapid unexpected changes in flight direction make it difficult for a predator to track prey.  In some species, like the European hare, erratic zigzag flight might be more effective in the  presence of predators that are faster than they are and straight flight more effective against predators that are slower. One observation that supports this suggestion is the recorded tendency for slow-flying black-beaded gulls, which are normally able to escape predators by means of direct flight, to show frequent changes in flight direction when they spot a peregrine falcon (peregrines are adept at capturing flying birds).

A quite different way of enhancing escape by flight is to use so-called "flash" behavior. Here, the alarmed prey flees for a short distance and then "freezes." Some predators are unexcited by immobile prey, and a startling flash of activity followed by immobility may confuse them. "Flash" behavior is used in particular by frogs and orthopteran insects, which make conspicuous jumps and then sit immobile. In some species, "flash" behavior is enhanced by the display of bright body markings. Good examples of insects with colorful markings are the red and yellow underwing moths. At rest, both species are a cryptic brown color. When they fly, however, brightly colored hind wings are exposed, which render the moths highly conspicuous. Similarly, some frogs and lizards have brightly colored patches or frills that may serve a “flash" function when they move quickly. Some species even appear to possess "flash" sounds. The loud buzzing and clicking noises made by some grasshoppers when they jump may serve to emphasize the movement

It can be inferred from the passage that the European hare_________

A. is faster than most of its predators

B. is capable of two kinds of flight

C. is more likely to escape using straight flight

D. is preyed upon by gulls and falcons

1
19 tháng 4 2019

Đáp án B
Đoạn 2: “In some species, like the European hare, erratic zigzag flight might be moreeffective in the presence of predators that are faster than they are and straight flight more
effective against predators that are slower.” = Ở một số loài, như loài thỏ rừng châu Âu, cuộc
chạy trốn theo hình zigzag gián đoạn có thể hiệu quả hơn với sự xuất hiện của động vật ăn thịt
nhanh hơn chúng và chạy trốn theo đường thẳng hiệu quả hơn trước những động vật ăn thịt
chậm hơn => thỏ rừng có thể chạy trốn theo hai cách

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.The response of most animals when suddenly faced with a predator is to flee. Natural  selection has acted in a variety of ways in different species to enhance the efficacy of the behaviors, known as "flight behaviors" or escape behaviors that are used by prey in fleeing predators. Perhaps the most direct adaptation is enhanced light speed and...
Đọc tiếp

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.

The response of most animals when suddenly faced with a predator is to flee. Natural  selection has acted in a variety of ways in different species to enhance the efficacy of the behaviors, known as "flight behaviors" or escape behaviors that are used by prey in fleeing predators. Perhaps the most direct adaptation is enhanced light speed and agility.

Adaptations for speed, however, are likely to require sacrifices biter attributes, so we might expect only some species to adopt a simple fast flight strategy. Another way of enhancing the effectiveness of flight is to move in an erratic and unpredictable way. Many species, like ptarmigans, snipes, and various antelopes and gazelles, flee from predators in a characteristic zigzag fashion. Rapid unexpected changes in flight direction make it difficult for a predator to track prey.  In some species, like the European hare, erratic zigzag flight might be more effective in the  presence of predators that are faster than they are and straight flight more effective against predators that are slower. One observation that supports this suggestion is the recorded tendency for slow-flying black-beaded gulls, which are normally able to escape predators by means of direct flight, to show frequent changes in flight direction when they spot a peregrine falcon (peregrines are adept at capturing flying birds).

A quite different way of enhancing escape by flight is to use so-called "flash" behavior. Here, the alarmed prey flees for a short distance and then "freezes." Some predators are unexcited by immobile prey, and a startling flash of activity followed by immobility may confuse them. "Flash" behavior is used in particular by frogs and orthopteran insects, which make conspicuous jumps and then sit immobile. In some species, "flash" behavior is enhanced by the display of bright body markings. Good examples of insects with colorful markings are the red and yellow underwing moths. At rest, both species are a cryptic brown color. When they fly, however, brightly colored hind wings are exposed, which render the moths highly conspicuous. Similarly, some frogs and lizards have brightly colored patches or frills that may serve a “flash" function when they move quickly. Some species even appear to possess "flash" sounds. The loud buzzing and clicking noises made by some grasshoppers when they jump may serve to emphasize the movement

It can be inferred that black-beaded gulls change direction when they spot a peregrine falcon for which of the following reasons?

A. The falcons are faster than the gulls.

B. The gulls want to capture the falcons

C. The falcons are unpredictable

D. The gulls depend on the falcons for protection

1
8 tháng 12 2019

Đáp án A
Đoạn 2: “In some species, like the European hare, erratic zigzag flight might be more effective in the presence of predators that are faster than they are and straight flight more
effective against predators that are slower.” = Ở một số loài, như loài thỏ rừng châu Âu, cuộc
chạy trốn theo hình zigzag gián đoạn có thể hiệu quả hơn với sự xuất hiện của động vật ăn thịt
nhanh hơn chúng và chạy trốn theo đường thẳng hiệu quả hơn trước những động vật ăn thịt
chậm hơn => Sau đó, đoạn văn lấy “black-beaded gulls” làm một minh họa cho trường hợp
tương tự như thỏ rừng châu Âu, chúng thay đổi hướng bay khi gặp “falcons” vì loài này bay
nhanh hơn

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.The response of most animals when suddenly faced with a predator is to flee. Natural  selection has acted in a variety of ways in different species to enhance the efficacy of the behaviors, known as "flight behaviors" or escape behaviors that are used by prey in fleeing predators. Perhaps the most direct adaptation is enhanced light speed and...
Đọc tiếp

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.

The response of most animals when suddenly faced with a predator is to flee. Natural  selection has acted in a variety of ways in different species to enhance the efficacy of the behaviors, known as "flight behaviors" or escape behaviors that are used by prey in fleeing predators. Perhaps the most direct adaptation is enhanced light speed and agility.

Adaptations for speed, however, are likely to require sacrifices biter attributes, so we might expect only some species to adopt a simple fast flight strategy. Another way of enhancing the effectiveness of flight is to move in an erratic and unpredictable way. Many species, like ptarmigans, snipes, and various antelopes and gazelles, flee from predators in a characteristic zigzag fashion. Rapid unexpected changes in flight direction make it difficult for a predator to track prey.  In some species, like the European hare, erratic zigzag flight might be more effective in the  presence of predators that are faster than they are and straight flight more effective against predators that are slower. One observation that supports this suggestion is the recorded tendency for slow-flying black-beaded gulls, which are normally able to escape predators by means of direct flight, to show frequent changes in flight direction when they spot a peregrine falcon (peregrines are adept at capturing flying birds).

A quite different way of enhancing escape by flight is to use so-called "flash" behavior. Here, the alarmed prey flees for a short distance and then "freezes." Some predators are unexcited by immobile prey, and a startling flash of activity followed by immobility may confuse them. "Flash" behavior is used in particular by frogs and orthopteran insects, which make conspicuous jumps and then sit immobile. In some species, "flash" behavior is enhanced by the display of bright body markings. Good examples of insects with colorful markings are the red and yellow underwing moths. At rest, both species are a cryptic brown color. When they fly, however, brightly colored hind wings are exposed, which render the moths highly conspicuous. Similarly, some frogs and lizards have brightly colored patches or frills that may serve a “flash" function when they move quickly. Some species even appear to possess "flash" sounds. The loud buzzing and clicking noises made by some grasshoppers when they jump may serve to emphasize the movement

The description of the prey's movement as "zigzag" in line 10 suggests that the movement is_________

A. reliable

B. fast

C. constant

D. unpredictable

1
3 tháng 8 2018

Đáp án D
Đoạn 2: “In some species, like the European hare, erratic zigzag flight might be more effective in the presence of predators that are faster than they are and straight flight more
effective against predators that are slower.” = Ở một số loài, như loài thỏ rừng châu Âu, cuộc
chạy trốn theo hình zigzag gián đoạn có thể hiệu quả hơn với sự xuất hiện của động vật ăn thịt
nhanh hơn chúng và chạy trốn theo đường thẳng hiệu quả hơn trước những động vật ăn thịt
chậm hơn => zigzag = unpredictable = không thể dự đoán trước

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.The response of most animals when suddenly faced with a predator is to flee. Natural  selection has acted in a variety of ways in different species to enhance the efficacy of the behaviors, known as "flight behaviors" or escape behaviors that are used by prey in fleeing predators. Perhaps the most direct adaptation is enhanced light speed and...
Đọc tiếp

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.

The response of most animals when suddenly faced with a predator is to flee. Natural  selection has acted in a variety of ways in different species to enhance the efficacy of the behaviors, known as "flight behaviors" or escape behaviors that are used by prey in fleeing predators. Perhaps the most direct adaptation is enhanced light speed and agility.

Adaptations for speed, however, are likely to require sacrifices biter attributes, so we might expect only some species to adopt a simple fast flight strategy. Another way of enhancing the effectiveness of flight is to move in an erratic and unpredictable way. Many species, like ptarmigans, snipes, and various antelopes and gazelles, flee from predators in a characteristic zigzag fashion. Rapid unexpected changes in flight direction make it difficult for a predator to track prey.  In some species, like the European hare, erratic zigzag flight might be more effective in the  presence of predators that are faster than they are and straight flight more effective against predators that are slower. One observation that supports this suggestion is the recorded tendency for slow-flying black-beaded gulls, which are normally able to escape predators by means of direct flight, to show frequent changes in flight direction when they spot a peregrine falcon (peregrines are adept at capturing flying birds).

A quite different way of enhancing escape by flight is to use so-called "flash" behavior. Here, the alarmed prey flees for a short distance and then "freezes." Some predators are unexcited by immobile prey, and a startling flash of activity followed by immobility may confuse them. "Flash" behavior is used in particular by frogs and orthopteran insects, which make conspicuous jumps and then sit immobile. In some species, "flash" behavior is enhanced by the display of bright body markings. Good examples of insects with colorful markings are the red and yellow underwing moths. At rest, both species are a cryptic brown color. When they fly, however, brightly colored hind wings are exposed, which render the moths highly conspicuous. Similarly, some frogs and lizards have brightly colored patches or frills that may serve a “flash" function when they move quickly. Some species even appear to possess "flash" sounds. The loud buzzing and clicking noises made by some grasshoppers when they jump may serve to emphasize the movement

The word "enhance” in line 2 is closest in meaning to_________

A. encourage

B. resist

C. increase

D. reveal

1
1 tháng 1 2017

Đáp án A
Nghĩa của cụm: “specific needs of women” => những nhu cầu cụ thể của phụ nữ

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.The response of most animals when suddenly faced with a predator is to flee. Natural  selection has acted in a variety of ways in different species to enhance the efficacy of the behaviors, known as "flight behaviors" or escape behaviors that are used by prey in fleeing predators. Perhaps the most direct adaptation is enhanced light speed and...
Đọc tiếp

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.

The response of most animals when suddenly faced with a predator is to flee. Natural  selection has acted in a variety of ways in different species to enhance the efficacy of the behaviors, known as "flight behaviors" or escape behaviors that are used by prey in fleeing predators. Perhaps the most direct adaptation is enhanced light speed and agility.

Adaptations for speed, however, are likely to require sacrifices biter attributes, so we might expect only some species to adopt a simple fast flight strategy. Another way of enhancing the effectiveness of flight is to move in an erratic and unpredictable way. Many species, like ptarmigans, snipes, and various antelopes and gazelles, flee from predators in a characteristic zigzag fashion. Rapid unexpected changes in flight direction make it difficult for a predator to track prey.  In some species, like the European hare, erratic zigzag flight might be more effective in the  presence of predators that are faster than they are and straight flight more effective against predators that are slower. One observation that supports this suggestion is the recorded tendency for slow-flying black-beaded gulls, which are normally able to escape predators by means of direct flight, to show frequent changes in flight direction when they spot a peregrine falcon (peregrines are adept at capturing flying birds).

A quite different way of enhancing escape by flight is to use so-called "flash" behavior. Here, the alarmed prey flees for a short distance and then "freezes." Some predators are unexcited by immobile prey, and a startling flash of activity followed by immobility may confuse them. "Flash" behavior is used in particular by frogs and orthopteran insects, which make conspicuous jumps and then sit immobile. In some species, "flash" behavior is enhanced by the display of bright body markings. Good examples of insects with colorful markings are the red and yellow underwing moths. At rest, both species are a cryptic brown color. When they fly, however, brightly colored hind wings are exposed, which render the moths highly conspicuous. Similarly, some frogs and lizards have brightly colored patches or frills that may serve a “flash" function when they move quickly. Some species even appear to possess "flash" sounds. The loud buzzing and clicking noises made by some grasshoppers when they jump may serve to emphasize the movement

All of the followings are mentioned as characteristics of "flash" behavior in line 16 EXCEPT _________

A. brief conspicuous activity

B. immobility

C. bright body markings

D. aggressive fighting

1
9 tháng 1 2018

Đáp án D
Câu A & B: “Flash behavior is used in particular by frogs and orthopteran insects, which
make conspicuous jumps and then sit immobile.”
Câu C: “In some species, "flash" behavior is enhanced by the display of bright body
markings.

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.The response of most animals when suddenly faced with a predator is to flee. Natural  selection has acted in a variety of ways in different species to enhance the efficacy of the behaviors, known as "flight behaviors" or escape behaviors that are used by prey in fleeing predators. Perhaps the most direct adaptation is enhanced light speed and...
Đọc tiếp

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.

The response of most animals when suddenly faced with a predator is to flee. Natural  selection has acted in a variety of ways in different species to enhance the efficacy of the behaviors, known as "flight behaviors" or escape behaviors that are used by prey in fleeing predators. Perhaps the most direct adaptation is enhanced light speed and agility.

Adaptations for speed, however, are likely to require sacrifices biter attributes, so we might expect only some species to adopt a simple fast flight strategy. Another way of enhancing the effectiveness of flight is to move in an erratic and unpredictable way. Many species, like ptarmigans, snipes, and various antelopes and gazelles, flee from predators in a characteristic zigzag fashion. Rapid unexpected changes in flight direction make it difficult for a predator to track prey.  In some species, like the European hare, erratic zigzag flight might be more effective in the  presence of predators that are faster than they are and straight flight more effective against predators that are slower. One observation that supports this suggestion is the recorded tendency for slow-flying black-beaded gulls, which are normally able to escape predators by means of direct flight, to show frequent changes in flight direction when they spot a peregrine falcon (peregrines are adept at capturing flying birds).

A quite different way of enhancing escape by flight is to use so-called "flash" behavior. Here, the alarmed prey flees for a short distance and then "freezes." Some predators are unexcited by immobile prey, and a startling flash of activity followed by immobility may confuse them. "Flash" behavior is used in particular by frogs and orthopteran insects, which make conspicuous jumps and then sit immobile. In some species, "flash" behavior is enhanced by the display of bright body markings. Good examples of insects with colorful markings are the red and yellow underwing moths. At rest, both species are a cryptic brown color. When they fly, however, brightly colored hind wings are exposed, which render the moths highly conspicuous. Similarly, some frogs and lizards have brightly colored patches or frills that may serve a “flash" function when they move quickly. Some species even appear to possess "flash" sounds. The loud buzzing and clicking noises made by some grasshoppers when they jump may serve to emphasize the movement

The phrase "in particular" in line 19 is closest in meaning to_________

A. especially

B. with difficulty

C. expertly

D. frequently

1
25 tháng 3 2017

Đáp án A
In particular = especially = đặc biệt là

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.The response of most animals when suddenly faced with a predator is to flee. Natural  selection has acted in a variety of ways in different species to enhance the efficacy of the behaviors, known as "flight behaviors" or escape behaviors that are used by prey in fleeing predators. Perhaps the most direct adaptation is enhanced light speed and...
Đọc tiếp

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.

The response of most animals when suddenly faced with a predator is to flee. Natural  selection has acted in a variety of ways in different species to enhance the efficacy of the behaviors, known as "flight behaviors" or escape behaviors that are used by prey in fleeing predators. Perhaps the most direct adaptation is enhanced light speed and agility.

Adaptations for speed, however, are likely to require sacrifices biter attributes, so we might expect only some species to adopt a simple fast flight strategy. Another way of enhancing the effectiveness of flight is to move in an erratic and unpredictable way. Many species, like ptarmigans, snipes, and various antelopes and gazelles, flee from predators in a characteristic zigzag fashion. Rapid unexpected changes in flight direction make it difficult for a predator to track prey.  In some species, like the European hare, erratic zigzag flight might be more effective in the  presence of predators that are faster than they are and straight flight more effective against predators that are slower. One observation that supports this suggestion is the recorded tendency for slow-flying black-beaded gulls, which are normally able to escape predators by means of direct flight, to show frequent changes in flight direction when they spot a peregrine falcon (peregrines are adept at capturing flying birds).

A quite different way of enhancing escape by flight is to use so-called "flash" behavior. Here, the alarmed prey flees for a short distance and then "freezes." Some predators are unexcited by immobile prey, and a startling flash of activity followed by immobility may confuse them. "Flash" behavior is used in particular by frogs and orthopteran insects, which make conspicuous jumps and then sit immobile. In some species, "flash" behavior is enhanced by the display of bright body markings. Good examples of insects with colorful markings are the red and yellow underwing moths. At rest, both species are a cryptic brown color. When they fly, however, brightly colored hind wings are exposed, which render the moths highly conspicuous. Similarly, some frogs and lizards have brightly colored patches or frills that may serve a “flash" function when they move quickly. Some species even appear to possess "flash" sounds. The loud buzzing and clicking noises made by some grasshoppers when they jump may serve to emphasize the movement

The word "alarmed" in line 17 is closest in meaning to_________

A. moving

B. selected

C. frightened

D. exhausted

1
8 tháng 6 2017

Đáp án C Alarmed = frightened = sợ hãi, bị dọa sợ

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.The response of most animals when suddenly faced with a predator is to flee. Natural  selection has acted in a variety of ways in different species to enhance the efficacy of the behaviors, known as "flight behaviors" or escape behaviors that are used by prey in fleeing predators. Perhaps the most direct adaptation is enhanced light speed and...
Đọc tiếp

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.

The response of most animals when suddenly faced with a predator is to flee. Natural  selection has acted in a variety of ways in different species to enhance the efficacy of the behaviors, known as "flight behaviors" or escape behaviors that are used by prey in fleeing predators. Perhaps the most direct adaptation is enhanced light speed and agility.

Adaptations for speed, however, are likely to require sacrifices biter attributes, so we might expect only some species to adopt a simple fast flight strategy. Another way of enhancing the effectiveness of flight is to move in an erratic and unpredictable way. Many species, like ptarmigans, snipes, and various antelopes and gazelles, flee from predators in a characteristic zigzag fashion. Rapid unexpected changes in flight direction make it difficult for a predator to track prey.  In some species, like the European hare, erratic zigzag flight might be more effective in the  presence of predators that are faster than they are and straight flight more effective against predators that are slower. One observation that supports this suggestion is the recorded tendency for slow-flying black-beaded gulls, which are normally able to escape predators by means of direct flight, to show frequent changes in flight direction when they spot a peregrine falcon (peregrines are adept at capturing flying birds).

A quite different way of enhancing escape by flight is to use so-called "flash" behavior. Here, the alarmed prey flees for a short distance and then "freezes." Some predators are unexcited by immobile prey, and a startling flash of activity followed by immobility may confuse them. "Flash" behavior is used in particular by frogs and orthopteran insects, which make conspicuous jumps and then sit immobile. In some species, "flash" behavior is enhanced by the display of bright body markings. Good examples of insects with colorful markings are the red and yellow underwing moths. At rest, both species are a cryptic brown color. When they fly, however, brightly colored hind wings are exposed, which render the moths highly conspicuous. Similarly, some frogs and lizards have brightly colored patches or frills that may serve a “flash" function when they move quickly. Some species even appear to possess "flash" sounds. The loud buzzing and clicking noises made by some grasshoppers when they jump may serve to emphasize the movement

Why does the author mention "grasshopper" in line 26?

A. To contrast animals that "flash" with animals that "freeze"

B. As an example of an animal whose "flash" behavior is a sound

C. To compare the jumping behavior of insects and reptiles

D. As an example of a predator that moths escape by using "flash" behavior

1
31 tháng 3 2017

Đáp án B
Hai câu cuối đoạn: “Some species even appear to possess "flash" sounds. The loud buzzing and clicking noises made by some grasshoppers when they jump may serve to emphasize the
movement.” = Một số loài có vẻ như sở hữu âm thanh “chớp sáng”. Tiếng vo ve và ù ù của
châu chấu khi chúng nhảy có thể đóng vai trò làm nổi bật sự di chuyển. => Ví dụ cho “flash” sounds.