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The ant and the pigeon

An ant crawled down to a brook to drink. A wave soared him over and he nearly drowned. A pigeon was flying overhead with a twig in her beak. She saw the ant climbed onto the twig and was sawed. Then a hunter bit a net over the pigeon and was about to pull it tight. The ant went up to the hunter and knocked his leg. The hunter cried out with pain and dropped the net. Out dropped the pigeon and flew away.

Flying threw bit flew knocked went

Soared cried saw climbed dropped crawled

21 tháng 7 2017

put the verb into the correct form

1. his doctor ad vised him( not smoke)..not to smoke..cigarettes.

2.an ant(go)..went.down to brook to drink. a wave(knock).knocked..him over and he nearly drowned. a pigeon(fly).flew..overhead with a twig in her break. she(see).saw.the ant drowning in the brook and(drop)..dropped.the twig to him. the ant( climb)climbed..onto the twig and was saved. then a hunter(throw).threw.a net over the pigeon and was about to pull it tight. the ant(crawl).crawled..up to the hunter and(bite).bit..his leg. the hunter(cry)..cried.out with pain and dropped the net. out(soar).soared..the pigeon and( fly)..flew.away.

24 tháng 7 2017

Mai Lan Hương à

1,complete the passage with the correct form of the verb in brackets                                  THE ANT AND THE PIGEGONAn ant                    (go) down to a brook to drink. A wave                   (knock) him over and he nearly drowned. At the moment, a pigeon              (fly) overhead with a twig in her beak. She                  (see) the ant drowing in the brook and                 (drop) the twig to him. The ant              (climb) onto the twig and was saved. Then a hunter    ...
Đọc tiếp

1,complete the passage with the correct form of the verb in brackets

                                  THE ANT AND THE PIGEGON

An ant                    (go) down to a brook to drink. A wave                   (knock) him over and he nearly drowned. At the moment, a pigeon              (fly) overhead with a twig in her beak. She                  (see) the ant drowing in the brook and                 (drop) the twig to him. The ant              (climb) onto the twig and was saved. Then a hunter                   (throw) a net over the pigeon and was about to pull it night. The ant             (crawl) up to the hunter and                  (bite) his leg. The hunter                      (cry) out with pain and dropped the net. Out                  (soar) the pigeon and                   (fly) away

 

2.complete the sentences, using the correct form of the words in brackets

1.when the                 failed, he struck the match to find the candles. (electric)

2.Our life is much better with the help of modern                  . (equip)

3. All the dancers wore                  costumes.(tradition)

4. My uncle is an                         engineer. (electrify)

5.                      , I lost my keys on the way home.( fortunate)

6. She was                  enuogh to believe him. (fool)

7. A fairy                  changed Little Pea's rags into beautiful clothes. (magic)

8. Everyone was very                   after hearing that news. (excite)

9. her father soon died of a                      heart. (break)

10. You made a wise                      when you chose to study Spanish. (decide)

1
22 tháng 7 2016

1.
go - went
knock - knocked
fly - flying
see - saw
drop - dropping
climb - climbed
throw - threw
crawl - crawled
bite - bit
cry - cried
soar - soaring
fly - flew
2.
1) electricity
2)eqiupment
3)traditional
4)electrical
5)unfortunately
6)foolish
7)magically
8)excited
9)broke
10)decided

1) One hot day, an ant was searching for some water. - What was an ant searching for? - Why was an ant searching for water one hot day? -Who was searching for water? - When was an ant searching for water? - How did an ant search for some water? - Where was an ant searching for some water? 2) After walking around for some time, she came to spring. -Who did come to spring? - Who did walk around? - Why did she come to spring? - Why did an ant walk around? - When did she come to...
Đọc tiếp

1) One hot day, an ant was searching for some water.

- What was an ant searching for?

- Why was an ant searching for water one hot day?

-Who was searching for water?

- When was an ant searching for water?

- How did an ant search for some water?

- Where was an ant searching for some water?

2) After walking around for some time, she came to spring.

-Who did come to spring?

- Who did walk around?

- Why did she come to spring?

- Why did an ant walk around?

- When did she come to spring?

- When did an ant stop walking around?

- Where did she come after walking around for some time?

- Where did she walk around?

- What did she come to spring for?

- What did an ant do before she came to spring?

- What did an ant do after walking around for some times?

- How long did she walk around?

- How many times did an ant walk around?

3) To reach the spring, she had to climb up a blade of grass.

- Who did have to climb up a blade of grass?

- Who did reach the spring?

- When did she have to climb up a blade of grass?

- When did she reach spring?

- Why did she have to climb up a blade of grass?

- Why did she reach the spring?

- Where did she have to climb?

- Where did she reach?

- How did she have to climb up a blade of grass?

- How did she have to climb up a blade of grass?

- How did she reach the spring?

- What did she do to reach the spring?

4) While making her way up, she slipped and fell into the water.

- Who did slip and fall into the water?

- Why did she slip and fall into the water?

- Where did she slip and fall?

- How did she slip and fall into the water?

- What did happen to an ant while she made her way up?

- When did an ant slip and fall into the water?

5) She could have drowned if a dove up a nearby tree had not seen her.

a) She could have drowned

- What could she do?

- When could she drowned?

- Why could she drowned?

- Who could have drowned if a dove up a nearby tree had not seen her?

b) A dove up a nearby tree had not seen her.

- Who was up a nearby tree?

- When had a dove up a nearby tree not seen her?

- Why had a dove up a nearby tree not seen her?

- Who was seen by a dove?

- Who did see the drowned ant?

- Who did a dove look at?

- Where did a dove look at?

- Where could the ant have drowned?

- What did a dove look at?

- What did happen to an ant if a dove up a nearby tree had not seen here?

- How could an ant have drowned?

6) Seeing that the ant was in trouble, the dove quickly plucked off a leaf and dropped it into the water near the struggling ant.

a) Seeing that the ant was in trouble

- Why was the ant in trouble?

- Who was in trouble?

- Where was the ant in trouble?

- How was the ant in trouble?

b) The dove quickly plucked off a leaf and dropped it into the water near struggling ant.

- Who did quickly pluck off a leaf and drop it into the water near the struggling ant?

- Where did the dove quickly pluck off a leaf and drop near the struggling ant?

- Why did the dove quickly pluck off a leaf and drop it into the water near the struggling ant?

- How did the dove quickly pluck off a leaf and drop it into the water near the struggling ant?

- How did the dove do when seeing that the ant was in trouble?

- Who did see that an ant was in trouble?

- When was an ant in a trouble?

- What did the dove see?

- What did the dove do when the dove saw that an ant was in trouble?

- What did happen to the ant?

-Where did the dove see the ant?

- When did the dove see the ant?

7) The ant moved towards the leaf and climb up there.

- Where did the ant move to?

- Who did move towards the leaf and climb up there?

- How did the ant move to-wards the leaf and climb up there?

- Why did the ant move to-wards the leaf and climb up there?

- What did the ant do?

- When did the ant move towards the leaf and climb up there?

- What did an ant move towards to?

- Where did an ant climb up?

- What did an ant climb up?

- Where was the leaf from?

- Where was an ant?

- Where was a leaf?

8) Soon it carried her safety to dry ground?

- Who did carry safety to dry ground?

- Who was carried safely to dry ground?

- What did the leaf do?

- Where did the leaf carry her?

- Why did it carry her safety to dry ground?

- How did it carry her safety to dry ground?

- When did the leaf carry an ant safely to dry ground?

- Where was the dry ground?

9) Just at that time, a hunter nearby was throwing out his net towards the dove, hoping to trap it.

- What did a hunter nearby do?

- Who was nearby throwing out his net towards the dove?

- Why was a hunter throwing out his net towards the dove?

- Where was a hunter throwing out his net?

- When did a hunter throw out his net?

- Where was a hunter?

- Whom was a hunter nearly throwing out his net towards?

- Who was thrown a net?

- What did a hunter hope?

- Who did a hunter hope to trap?

- Who did hope to trap a dove?

- What did a hunter throw?

10) Guessing what he was about to do, the ant quickly bit him on the heel.

- Who did quickly bite him on the heel?

- What did the ant do?

- Why did the ant quickly bite him on the heel?

- How did the ant quickly bite him on the heel?

- Who did guess what a hinter was about to do?

- What was a hunter about to do?

- What did happen if the ant did not quickly bite the hunter on the heel?

- Where did an ant bit the hunter?

- When did an ant bit the hunter?

11) Feeling the pain, the hunter dropped his net.

- Who did drop his net?

- Why did the hunter drop his net?

- How did the hunter drop his net?

- What did the hunter do?

- Where did the hunter drop his net?

- Who did feel the pain?

- Why did the hunter feel the pain?

- When did the hunter drop his net?

- What did the hunter do when he fell the pain?

12) The dove was quick to fly away to safety.

- Who was quick to fly away safety?

- How did the dove do to safety?

- When was the dove quick to fly away to safety?

- Why was the dove quick to fly away?

- Where did the dove fly?

- How did the dove fly?

- What did the dove do?

Answer the question

Please help me!!!

2

One hot day, an ant was searching for some water. After walking around for some time, she came to a spring. To reach the spring, she had to climb up a blade of grass. While making her way up, she slipped and fell into the water. She could have drowned if a dove up a nearby tree had not seen her. Seeing that the ant was in trouble, the dove quickly plucked off a leaf and dropped it into the water near the struggling ant. The ant moved towards the leaf and climbed up there.

Soon it carried her safely to dry ground. Just at that time, a hunter nearby was throwing out his net towards the dove, hoping to drop it. Guessing that he was about to do, the ant quickly bit him on the heel. Feeling the pain, the hunter dropped his net, the dove was quick to fly away to safety

Answer these questions base on this paragraph.

Please help me!!! Thank you very very very much

11 tháng 5 2021

em là lớp 2 ạ

Read the following passage and mark the letter A, 8, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 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...
Đọc tiếp

Read the following passage and mark the letter A, 8, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 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.

Question 40: The author mentions the trail pheromone of the leafcutter ant in paragraph 2 to point out ______.

A. a type of ant that is common in many parts of the world

B. how little pheromone is needed to mark a trail

C. the different types of pheromones ants can produce

D. that certain ants can produce up to one milligram of pheromone

1
28 tháng 7 2019

Đáp án B

Tác giả đề cập đến dấu vết pheromone của kiến cắn lá ở đoạn 2 để chỉ ra ______.

A. Một loại kiến phổ biến ở nhiều nơi trên thế giới

B. Cần rất ít Pheromone để đánh dấu một dấu vết

C. Các loại pheromones khác nhau ma kiến có thể sản sinh

D. Một số kiến có thể sản sinh đến một miligarn pheromone

Căn cứ vào thông tin trong câu sau:

“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.” (Các nhà điều tra làm việc với dấu vết pheromone của loài kiến cắn lá Atto texono tính toán rằng một miiigarn của chất này sẽ đủ để dẫn một dãy kiến đi ba lần vòng quanh Trái đất.)

Read 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...
Đọc tiếp

Read 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.

The author mentions the trail pheromone of the leafcutter ant in line 11 to point out

A. how little pheromone is needed to mark a trail 

B. the different types of pheromones ants can produce 

C. a type of ant that is common in many parts of the world 

D. that certain ants can produce up to one milligram of pheromone

1
12 tháng 8 2019

Đáp án A

Tác giả đề cập đến dấu vết pheromone của kiến cắn lá ở dòng 11 để chỉ ra

A. cần rất ít Pheromone để đánh dấu một dấu vết

B. các loại pheromones khác nhau mà kiến có thể sản sinh

C. một loại kiến phổ biến ở nhiều nơi trên thế giới

D. Một số kiến có thể sản sinh đến một miligam pheromone

Dẫn chứng: 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.

Read the following text and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questionsMany 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 –...
Đọc tiếp

Read the following text and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions

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.

The author mentions the trail pheromone of the leafcutter ant in paragraph 2 to point out

A. a type of ant that is common in many parts of the world

B. how little pheromone is needed to mark a trail

C. the different types of pheromones ants can produce

D. that certain ants can produce up to one milligram of pheromone

1
14 tháng 4 2017

B

Kiến thức: Đọc hiểu

Giải thích:

Tác giả đề cập đến dấu vết pheromone của kiến cắn lá ở đoạn 2 để chỉ ra

A. một loại kiến phổ biến ở nhiều nơi trên thế giới

B. cần rất ít Pheromone để đánh dấu một dấu vết

C. các loại pheromones khác nhau mà kiến có thể sản sinh

D. Một số kiến có thể sản sinh đến một miligam pheromone

Thông tin: 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.

Read the following text and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions 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...
Đọc tiếp

Read the following text and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions

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.

The author mentions the trail pheromone of the leafcutter ant in paragraph 2 to point out

A. a type of ant that is common in many parts of the world

B. how little pheromone is needed to mark a trail

C. the different types of pheromones ants can produce

D. that certain ants can produce up to one milligram of pheromone

1
30 tháng 1 2019

B

Kiến thức: Đọc hiểu

Giải thích:

Tác giả đề cập đến dấu vết pheromone của kiến cắn lá ở đoạn 2 để chỉ ra

A. một loại kiến phổ biến ở nhiều nơi trên thế giới

B. cần rất ít Pheromone để đánh dấu một dấu vết

C. các loại pheromones khác nhau mà kiến có thể sản sinh

D. Một số kiến có thể sản sinh đến một miligam pheromone

Thông tin: 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.

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. 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 on the ground and depositing a tiny amount of trail...
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. 

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 on 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 Attatexana 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.

The author mentions the trail pheromone of the leafcutter ant in the second paragraph to point out________.

A. how little pheromone is needed to mark a trail

B. the different types of pheromones ants can produce

C. that certain ants can produce up to one milligram of pheromone

D. a type of ant that is common in many parts of the world

1
14 tháng 11 2017

A

Thông tin ở câu cuối đoạn số 2: “Investigators working with the trail pheromone of the leafcutter ant Attatexana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.” (...1 mg hợp chất này cũng đã đủ để dẫn đầu/làm đầu mối cho một toán kiến 3 lần quanh trái đất)

Tức là how little pheromone is needed to mark a trail: chỉ cần một lượng hợp chất nhỏ cũng đủ để đánh dấu vết

Read 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.           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...
Đọc tiếp

Read 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.

          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.

The author mentions the trail pheromone of the leafcutter ant in line 11 to point out

A. how little pheromone is needed to mark a trail

B. the different types of pheromones ants can produce

C. a type of ant that is common in many parts of the worl

D. that certain ants can produce up to one milligram of pheromone 

1
22 tháng 12 2018

Đáp án A

Dịch: Tác giả đề cập đến đường dấu pheromones của loài kiến cắt lá ở dòng 11 để chỉ ra rằng

A. Cần rất ít pheromones để đánh dấu một đường

B. Những loài pheromones khác nhau mà kiến có thể tạo ra

C. Một loài kiến phổ biến ở nhiều nơi trên thế giới

D. Chỉ một số loài kiến nhất định mới có thể tạo ra đến 1 miligram pheromones

Thông tin nằm ở đoạn 2: Investigators working with the trail pheromone of the leafcutter ant Attatexana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth (Các nhà điều tra làm việc với các đường dấu pheromone của kiến cắt lá Attatexana đã tính rằng một miligam của chất này sẽ đủ để dẫn một hàng kiến dài bằng ba lần Trái đất). Chỉ rất ít chất đó mà dẫn được rất nhiều kiến, do đó ta chọn được A.