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12 tháng 10 2018

32/3 nha ban

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 onto the 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 word “intermittently” in the passage is closest in meaning to _______. 

A. lazily 

B. happily 

C. periodically 

D. incorrectly 

1
4 tháng 12 2019

Chọn C

Kiến thức: Đọc hiểu

Giải thích:

Từ “intermittently” trong bài đọc gần nghĩa nhất với_______.

  A. lười biếng                                              

B. vui vẻ

  C. một cách tuần hoàn, liên tục                 

D. không chính xác

Thông tin: 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.

Tạm dịch: Khi một con kiến thợ trở về tổ sau khi tìm được nguồn thức ăn, nó đánh dấu đường bằng cách liên tục chạm vào cái vòi của nó vào mặt đất và để lại một lượng nhỏ pheromone dẫn đường - một hợp chất mang nhiều lời nhắn khác nhau tùy vào từng tình huống

19 tháng 4 2018

đây là dịch

Diện tích của hình chữ nhật bằng diện tích của một hình vuông.cạnh của hình vuông ít hơn 4cm so với chiều dài của hình chữ nhật nhưng nhiều hơn chiều rộng của hình chữ nhật 3cm. Hỏi chu vi hình chữ nhật là gì?

cách giải thì mình chưa biết bạn tự giải nhé

19 tháng 4 2018

dich va dap an nha

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 onto the 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

What does the word “it” in paragraph 3 refer to? 

A. signal 

B. ant 

C. antenna 

D. space 

1
4 tháng 4 2019

Chọn B

Kiến thức: Đọc hiểu

Giải thích:

Từ “it” trong đoạn 3 muốn nói đến_____

  A. kí hiệu                 

B. con kiến                 

C. râu                         

D. không gian

Thông tin: 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.

Tạm dịch: Tín hiệu mà nó nhận được khiến nó xoay sang trái và con kiến sau đó lại tiếp tục như vậy cho đến khi râu bên phải của nó chạm tới không gian hơi

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 onto the 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, how are ants guided by trail pheromones? 

A. They avoid the vapor spaces by moving in a straight line

B. They concentrate on the smell of food

C. They follow an ant which is familiar with the trail

D. They sense the vapor through their antennae

1
21 tháng 12 2018

Chọn D

Kiến thức: Đọc hiểu

Giải thích:

Theo bài đọc, kiến được pheromone dẫn đường như thế nào?

  A. Chúng tránh không gian hơi bằng cách di chuyển theo đường thẳng.

  B. Chúng tập trung vào mùi thức ăn.

  C. Chúng đi theo một con kiến quen với dấu vết.

  D. Chúng cảm nhận hơi bằng râu của mình.

Thông tin: 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.

Tạm dịch: Hơi của pheromone bay hơi trên dấu vết chỉ dẫn một con kiến dọc đường đi và con kiến đó phát hiện ra tín hiệu này bằng các thụ quan trên râu của nó

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 onto the 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

What does the passage mainly discuss? 

A. How ants mark and follow a chemical trail

B. Different species of ants around the world 

C. The information contained in pheromones

D. The mass migration of ants

1
31 tháng 3 2018

Chọn A

Kiến thức: Đọc hiểu

Giải thích:

Bài đọc chủ yếu thảo luận về điều gì?

  A. Cách kiến ra dấu và đi theo một dấu vết hóa chất                  

B. Những loài kiến khác nhau trên thế giới

  C. Thông tin chứa đựng trong pheromone

D. Di cư hàng loạt của loài kiến

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 onto the 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

Why do ants use different compounds as trail pheromones? 

A. To protect their trail from other species 

B. To reduce their sensitivity to some chemicals

C. To indicate how far away the food is 

D. To attract different types of ants 

1
24 tháng 3 2019

Chọn A

Kiến thức: Đọc hiểu

Giải thích:

Tại sao loài kiến sử dụng các hợp chất khác nhau làm pheromone dẫn đường?

  A. để bảo vệ dấu vết của chúng khỏi những loài khác

  B. để giảm độ nhạy của chúng với một số hóa chất

  C. để chỉ ra thức xa cách bao xa

  D. để thu hút các loài kiến khác

Thông tin: 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.

Tạm dịch: Không giống như những lời nhắn khác, ví dụ như lời nhắn phát ra từ một con kiến chết, một dấu vết thức ăn phải được giữ bí mật với các thành viên của các loài khác. Thật không ngạc nhiên khi các loài kiến sử dụng nhiều hợp chất khác nhau làm pheromone dẫn đường.

Dịch bài đọc:

Nhiều loài kiến tìm kiếm thức ăn trên khắp các miền quê với số lượng lớn và thực hiện di cư hàng loạt; những hoạt động này được tiến hành bởi một con kiến đặt một dấu vết trên mặt đất để những con khác đi theo. Khi một con kiến thợ trở về tổ sau khi tìm được nguồn thức ăn, nó đánh dấu đường bằng cách liên tục chạm vào cái vòi của nó vào mặt đất và để lại một lượng nhỏ pheromone dẫn đường - một hợp chất mang nhiều thông điệp khác nhau tùy vào từng tình huống. Những dấu vết này kết hợp với việc không có thông tin về hướng, những con kiến khác có thể đi theo từ mọi phía.

Không giống như những lời nhắn khác, ví dụ như thông điệp phát ra từ một con kiến chết, một dấu vết thức ăn phải được giữ bí mật với các thành viên của các loài khác. Không ngạc nhiên khi các loài kiến sử dụng

nhiều hợp chất khác nhau làm pheromone dẫn đường. Loài kiến cực kì nhạy cảm với những kí hiệu này. Những người nghiên cứu pheromone dẫn đường của loài kiến xén lá Attatexana đã ước tính rằng cứ 1 mg chất này sẽ đủ để dẫn dắt một đội hình kiến gấp 3 lần xung quanh Trái Đất.

Hơi của pheromone bay hơi trên dấu vết chỉ dẫn một con kiến dọc đường đi và con kiến đó phát hiện ra tín hiệu này bằng các thụ quan trên râu của nó. Pheromone dẫn đường sẽ bay hơi để cung cấp nồng độ hơi cao nhất ngay trên dấu vết để lại, trong cái được gọi là không gian hơi. Theo dấu vết, con kiến di chuyển sang phải và trái, đu đưa từ bên này sang bên kia qua dấu vết để lại, lần lượt đưa từng râu vào không gian hơi. Tín hiệu mà nó nhận được khiến nó xoay sang trái và con kiến sau đó lại tiếp tục như vậy cho đến khi râu bên phải của nó chạm tới không gian hơi. Sau đó nó quay ngược về bên phải, và cứ thế len lỏi theo dấu vết

16 tháng 3 2016

đã biết học nhu rồi mà còn ra câu tiếng anh

16 tháng 3 2016

dịch ra là thế này: Trong hình, ABCD là một hình bình hành, K là trung điểm của cạnh AD, AB = 2,5cm, BC = 5cm, CH = 4cm. diện tích của hình thang BCDK là gì?

rất tiếc em mới học lớp 7

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 following questions. Fish that live on the sea bottom benefit by being flat and hugging the contours. There are two very different types of flatfish and they have evolved in very separate ways. The skates and rays, relatives of the sharks, have become flat in what might be called the obvious way. Their bodies have grown out sideways to form great “wings”. They look...
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 following questions.

Fish that live on the sea bottom benefit by being flat and hugging the contours. There are two very different types of flatfish and they have evolved in very separate ways. The skates and rays, relatives of the sharks, have become flat in what might be called the obvious way. Their bodies have grown out sideways to form great “wings”. They look as though they have been flattened but have remained symmetrical and “the right way up”. Conversely, fish such as plaice, sole, and halibut have become flat in a different way. There are bony fish which have a marked tendency to be flattened in a vertical direction; they are much “taller” then they are wide. They use their whole, vertically flattened bodies as swimming surfaces, which undulate through the water as they move. Therefore, when their ancestors migrated to the seabed, they lay on one side than on their bellies. However, this raises the problem that one eye was always looking down into the sand and was effectively useless – In evolution this problem was solved by the lower eye “moving” around the other side. We see this process of moving around enacted in the development of every young bony flatfish. It starts life swimming near the surface, and is symmetrical and vertically flattened, but then the skull starts to grow in a strange asymmetrical twisted fashion, so that one eye, for instance the left, moves over the top of the head upwards, and old Picasso – like vision. Incidentally, some species of 20 flatfish settle on the right side, others on the left, and others on either side.

It can be inferred from the passage that the early life of a flatfish is _______.

A. often confusing

B. pretty normal

C. very difficult

D. full of danger

1
2 tháng 2 2018

Đáp án C.

Câu hỏi bắt ta suy đoán về giai đoạn đầu đời của loài cá dẹt: “the early life of a flatfish”.

Quá trình tiến hóa đã hoàn thành do vậy khi cá con sinh ra và lớn lên vẫn theo quá trình tương tự như bố mẹ chúng. Do vậy, giai đoạn đầu đời của cá dẹt được xem là bình thường. Chọn đáp án C. pretty normal. Các đáp án khác không phù hợp

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 following questions.Fish that live on the sea bottom benefit by being flat and hugging the contours. There are two very different types of flatfish and they have evolved in very separate ways. The skates and rays, relatives of the sharks, have become flat in what might be called the obvious way. Their bodies have grown out sideways to form great “wings”. They look...
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 following questions.

Fish that live on the sea bottom benefit by being flat and hugging the contours. There are two very different types of flatfish and they have evolved in very separate ways. The skates and rays, relatives of the sharks, have become flat in what might be called the obvious way. Their bodies have grown out sideways to form great “wings”. They look as though they have been flattened but have remained symmetrical and “the right way up”. Conversely, fish such as plaice, sole, and halibut have become flat in a different way. There are bony fish which have a marked tendency to be flattened in a vertical direction; they are much “taller” then they are wide. They use their whole, vertically flattened bodies as swimming surfaces, which undulate through the water as they move. Therefore, when their ancestors migrated to the seabed, they lay on one side than on their bellies. However, this raises the problem that one eye was always looking down into the sand and was effectively useless – In evolution this problem was solved by the lower eye “moving” around the other side. We see this process of moving around enacted in the development of every young bony flatfish. It starts life swimming near the surface, and is symmetrical and vertically flattened, but then the skull starts to grow in a strange asymmetrical twisted fashion, so that one eye, for instance the left, moves over the top of the head upwards, and old Picasso – like vision. Incidentally, some species of 20 flatfish settle on the right side, others on the left, and others on either side.

It can be inferred from the passage that the early life of a flatfish is _______.

A. often confusing

B. pretty normal

C. very difficult

D. full of danger

1
25 tháng 10 2017

Đáp án C.

Câu hỏi bắt ta suy đoán về giai đoạn đầu đời của loài cá dẹt: “the early life of a flatfish”.

Quá trình tiến hóa đã hoàn thành do vậy khi cá con sinh ra và lớn lên vẫn theo quá trình tương tự như bố mẹ chúng. Do vậy, giai đoạn đầu đời của cá dẹt được xem là bình thường. Chọn đáp án C. pretty normal. Các đáp án khác không phù hợp