A beetle starts at correr A of a aquare ABCD. Each minute, the beetle moves along axactly one side of the squaer from one correr of the square to another correr. For exmple, in the first two minutes,...

NH

Nguyễn Hữu Lâm

24 tháng 9 2020 - olm

A beetle starts at correr A of a aquare ABCD. Each minute, the beetle moves along axactly one side of the squaer from one correr of the square to another correr. For exmple, in the first two minutes, the beetle could have one of 4 walks: ABA, ADA, ABC, ADC. How many walks can the beetle have from correr A to correr C in 10 minutes?

#Toán lớp 7

0

LQ

Lê Quỳnh Anh

27 tháng 10 2018

The Game of SquaresEither boys or girls, usually aged from seven to ten, play the two-person game of"Mandarin's Box". They draw a rectangle on the ground and (1)……….. it into ten smallsquares called "rice fields" or "fish ponds”.They also draw two additional semi-circular boxesat the two (2)………. of the rectangle, which are called"mandarin's boxes" - the game's name. Each person has 25 small pebbles and a bigger stone.Each player places the stone in one of the mandarin's boxes and...

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#Tiếng anh thí điểm lớp 9

1

DH

Dương Hoàn Anh

27 tháng 10 2018

Đáp án: B

Divide into (v): chia thành

Dịch: Họ vẽ một hình chữ nhật trên mặt đất và chia nó thành mười mảnh nhỏ gọi là "cánh đồng lúa" hay "ao cá.

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DM

Dương Minh

31 tháng 7 2018

Read the text then choose the best answer to fill in the blanks.The Game of SquaresEither boys or girls, usually aged from seven to ten, play the two-person game of"Mandarin's Box". They draw a rectangle on the ground and (1)……….. it into ten smallsquares called "rice fields" or "fish ponds”. They also draw two additional semi-circular boxesat the two (2)………. of the rectangle, which are called"mandarin's boxes" - the game's name. Each person has 25 small pebbles and a bigger...

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Read the text then choose the best answer to fill in the blanks.

The Game of Squares

Either boys or girls, usually aged from seven to ten, play the two-person game of"Mandarin's Box". They draw a rectangle on the ground and (1)……….. it into ten smallsquares called "rice fields" or "fish ponds”.

They also draw two additional semi-circular boxesat the two (2)………. of the rectangle, which are called"mandarin's boxes" - the game's name. Each person has 25 small pebbles and a bigger stone.

Each player places the stone in one of the mandarin's boxes and five small pebbles in each of the other squares. Then the game begins. The first player takes up the contents of one square on his or her side ofthe board, but not a mandarin's box and distributes the pebbles one by one, (3)……….. with the next square in (4)………. direction. Since each square contains five pebbles at the beginning, the first move will distribute five pebbles to the left or right.

After the last pebble is distributed, the player takes the contents of the following squareand repeats the distribution (5)………... But if the following square is one of the mandarin's boxes, the turn ends and passes to the other player.

If the last pebble falls into a square that precedes one empty square, the player wins all the contents of the square following the empty square and (6)……….these pebbles from the board. However, if there are two or more empty squares in a row, the player (7)…….. his or her turn.

Once a player has taken pebbles from the board, the turn is (8)……….to the other player. If all five squares on one player's side of the board are emptied at any time, that player must place one pebble he or she has aside back in each of the five squares so that the game can resume.

The game (9)………until the two mandarins' boxes have both been (10)……….. At the end of the game, the player with more pebbles wins, with each of the large stones counting as ten points.

Question 1

A. share

B. divide

C. separate

D. leave

#Tiếng anh lớp 9

1

NH

Nguyen Hoang Hai

31 tháng 7 2018

Đáp án: B

Giải thích: Devide into: chia ra

Dịch: Họ vẽ một hình chữ nhật trên mặt đất và chia nó thành mười mảnh nhỏ gọi là "cánh đồng lúa" hay "ao cá.

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PG

Phong Gió

13 tháng 2 2020 - olm

Each of the integers from 1 to 16 inclusive is put in a different square of a 4 by 4 table. For any two squares sharing a common side, the sum of the numbers in them is recorded. What is the maximum value of the smallest one among the recorded numbers?

#Toán lớp 8

0

LQ

Lê Quỳnh Anh

4 tháng 12 2019

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...

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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.

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

#Mẫu giáo

1

DH

Dương Hoàn Anh

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

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LQ

Lê Quỳnh Anh

4 tháng 4 2019

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

#Mẫu giáo

1

DH

Dương Hoàn Anh

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

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LQ

Lê Quỳnh Anh

21 tháng 12 2018

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

#Mẫu giáo

1

DH

Dương Hoàn Anh

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

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LQ

Lê Quỳnh Anh

31 tháng 3 2018

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

#Mẫu giáo

1

DH

Dương Hoàn Anh

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

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LQ

Lê Quỳnh Anh

24 tháng 3 2019

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

#Mẫu giáo

1

DH

Dương Hoàn Anh

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

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LQ

Lê Quỳnh Anh

12 tháng 8 2018

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 from 1 to 5In 1976 one survey revealed that 3000 bald eagles in the lower 48 States, the mainland, of the USA. By 1984 another survey, an incomplete midwinter one, put the number at almost, 12000 bald eagles in those same nest states.The eagle, America’s national Symbol, had been shot and poisoned and deprived of its living space. Another reason for its...

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