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Question 41. The word them in paragraph 3 refers to ______.A. chicksB. eggsC. ostrichesD. herdsQuestion 42. According to the passage, ostriches use their wings to______.A. fly faster than most other birdsB. move forward and change directionC. keep their eggs warm in the nestD. scare potential predators awayQuestion 43: Which of the following is NOT true about ostriches?A. No birds on the earth are as large as ostrichesB. Ostriches are raised for different purposesC. They have wings to fly like...
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Question 41. The word them in paragraph 3 refers to ______.

A. chicks

B. eggs

C. ostriches

D. herds

Question 42. According to the passage, ostriches use their wings to______.

A. fly faster than most other birds

B. move forward and change direction

C. keep their eggs warm in the nest

D. scare potential predators away

Question 43: Which of the following is NOT true about ostriches?

A. No birds on the earth are as large as ostriches

B. Ostriches are raised for different purposes

C. They have wings to fly like other birds

D. They live in many different places now

Read the following and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 44 to 50 .

The invention of the airplane , like many great inventions, was initially met with ridicule and disbelief.

Although many people who heard about the first powered flight on December 17, 1903, were excited and impressed, others reacted with peals of laughter. The idea of flying an aircraft was repulsive to some people. Although Orville and Wilbur Wright, the inventors of the first flying machine, were called impulsive fools, the Wrights continued their experiments in aviation.

Orville and Wilbur Wright had always had a compelling interest in aeronautics and mechanics. As young boys they earned money by making and selling kites and mechanical toys. Later, they designed a newspaper-folding machine, built a printing press, and operated a bicycle-repair shop. In 1896, when they read about the death of Otto Lilienthal, the brother's interest in flight grew into a compulsion.

Lilienthal, a pioneer in hang-gliding, had controlled his gliders by shifting his body in the desired direction. This idea was repellent to the Wright brothers, however, and they searched for more efficient methods to control the balance of airborne vehicles. In 1900 and 1901, the Wrights tested numerous gliders and developed control techniques. The brothers' inability to obtain enough lift power for the gliders almost led them to abandon their efforts.

After studying and experimenting with model wings in a wind tunnel, the Wright brothers designed their first airplane in 1903 for less than one thousand dollars. They even designed and built their own lightweight gasoline engine. On December 17, they successfully flew the plane for twelve seconds and 120 feet, despite a turbulent start.

By 1905 the Wrights had perfected the first airplane that could turn, circle, and remain airborne for half an hour at a time. Others had flown in balloons or in hang gliders, but the Wright brothers were the first to build a full-size machine that could fly under its own power. As the contributors of one of the most outstanding engineering achievements in history, the Wright brothers are accurately called the fathers of aviation.

(Adapted from https://www.testprepreview.com/modules/reading1.htm)

Question 44: Which of the following can be the best title for the passage?

A. Life of the Wright Brothers

B. Exceptional Inventions in the World

C. The Invention of the Airplane

D. The History of Aviation

Question 45: The word repulsive in paragraph 1 is closest in meaning to ______.

A. boring

B. unacceptable

C. exciting

D. ambitious

Question 46: The Wright brothers searched for ways to control the balance of airborne machines by ______.

A. shifting body in the desired direction

B. creating enough lifts power for the gliders

C. making numerous gliders with light wings

D. developing techniques of hang-gliding

Question 47: The noun compulsion in paragraph 2 can be best replaced by ______.

A. problem

B. plan

C. need

D. thought

Question 48: The word them in paragraph 3 refer to ______.

A. gliders

B. the Wright brothers

C. techniques

D. vehicles

Question 49: Which of the following is NOT true, according to the passage?

A. The Wright brothers didn’t like Lilienthal’s idea about controlling gliders.

B. The Wright brothers earned their living by designing and selling kites and toys.

C. The Wright brothers' first airplane could fly 120 feet in 1905.

D. The Wright brothers didn’t give up when their first gliders failed to function properly.

Question 50: Which of the following can be inferred from the passage?

A. The invention of the airplane wasn’t welcomed at first.

B. Lilienthal’s idea helped the Wright brothers build their airplane.

C. The Wright brothers failed to find out methods to control the balance of airborne vehicles.

D. The experiment of the Wright brothers did not enable them to design a flying machine.

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17 tháng 1

help me

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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. Birds have evolved many physical attributes that contribute to their flying ability. Wings are important, but adjustable tails, large hearts and light bones play critical roles. To fly, birds, like airplanes, move air across their wings. Wings are designed so that air above the wings is forced to move faster than air below the wing. This creates...
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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 following questions.

Birds have evolved many physical attributes that contribute to their flying ability. Wings are important, but adjustable tails, large hearts and light bones play critical roles.

To fly, birds, like airplanes, move air across their wings. Wings are designed so that air above the wings is forced to move faster than air below the wing. This creates higher pressure under the wings, called lift, which pushes the bird up. Different wing types evolved for different ways of flying. Prolonged flight requires long wings and an ability to soar. Other birds need superior maneuverability. Finches and sparrows

have short, broad wings. Faster birds, like hawks, have built-in spoilers that reduce turbulence while flying. This allows a steeper angle of attack without stalling.

Tails have evolved for specialized use. The tail acts like a rudder helping birds steer. Birds brake by spreading out their tails as they land. This adaptation allows them to make sudden, controlled stops-an essential skill, since most birds need to land on individual branches or on prey.

Flight takes muscle strength. If body builders has wings, they still could not flap hard enough to leave the ground. Birds have large, specialized hearts that beat much faster than the human heart and provide the necessary oxygen to the muscles. The breast muscle accounts for 15 percent of the bird’s body weight. On pigeons, it accounts for a third of their total body weight.

Birds carry no excess baggage; they have hollow feathers and hollow bones with struts inside to maintain strength, like cross beams in a bridge. Birds fly to find prey, escape predators, and attract mates-in other words, to survive

The phrase “finches and sparrows” in paragraph 2 refers to_________. 

A. wings 

B. maneuvers 

C. ways of flying 

D. birds 

1
28 tháng 9 2017

Chọn D

Kiến thức: Đọc hiểu

Giải thích:

Cụm từ “finches and sparrows” ở đoạn 2 nói đến________.

  A. đôi cánh              

B. sự vận động           

C. cách bay                 

D. các loài chim

Thông tin: Finches and sparrows have short, broad wings.

Tạm dịch: Chim hoa mai và chim sẻ có đôi cánh ngắn và rộng

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.Birds have evolved many physical attributes that contribute to their flying ability. Wings are important, but adjustable tails, large hearts and light bones play critical roles.To fly, birds, like airplanes, move air across their wings. Wings are designed so that air above the wings is forced to move faster than air below the wing. This creates...
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.

Birds have evolved many physical attributes that contribute to their flying ability. Wings are important, but adjustable tails, large hearts and light bones play critical roles.

To fly, birds, like airplanes, move air across their wings. Wings are designed so that air above the wings is forced to move faster than air below the wing. This creates higher pressure under the wings, called lift, which pushes the bird up. Different wing types evolved for different ways of flying. Prolonged flight requires long wings and an ability to soar. Other birds need superior maneuverability. Finches and sparrows

have short, broad wings. Faster birds, like hawks, have built-in spoilers that reduce turbulence while flying. This allows a steeper angle of attack without stalling.

Tails have evolved for specialized use. The tail acts like a rudder helping birds steer. Birds brake by spreading out their tails as they land. This adaptation allows them to make sudden, controlled stops-an essential skill, since most birds need to land on individual branches or on prey.

Flight takes muscle strength. If body builders has wings, they still could not flap hard enough to leave the ground. Birds have large, specialized hearts that beat much faster than the human heart and provide the necessary oxygen to the muscles. The breast muscle accounts for 15 percent of the bird’s body weight. On pigeons, it accounts for a third of their total body weight.

Birds carry no excess baggage; they have hollow feathers and hollow bones with struts inside to maintain strength, like cross beams in a bridge. Birds fly to find prey, escape predators, and attract mates-in other words, to survive

According to the passage, what benefit comes from having built-in spoilers? 

A. an ability to fly faster 

B. a steeper angle of diving for prey 

C. prolonged fight 

D. superior maneuverability when climbing 

1
24 tháng 10 2017

Chọn B

Kiến thức: Đọc hiểu

Giải thích:

Theo bài đọc, lợi ích của các tấm lái ngang được tích hợp sẵn là?

  A. khả năng bay nhanh hơn                      

B. góc lặn dốc hơn tới chỗ con mồi

  C. chuyến bay kéo dài                                                                 

D. khả năng hoạt động vượt trội khi leo núi

Thông tin: Faster birds, like hawks, have built-in spoilers that reduce turbulence while flying. This allows a steeper angle of attack without stalling.

Tạm dịch: Những con chim nhanh hơn, như diều hâu, có tấm lái ngang được tích hợp sẵn giúp giảm nhiễu loạn trong khi bay. Điều này cho phép một góc độ tấn công dốc hơn mà không bị chao đảo

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. Birds have evolved many physical attributes that contribute to their flying ability. Wings are important, but adjustable tails, large hearts and light bones play critical roles. To fly, birds, like airplanes, move air across their wings. Wings are designed so that air above the wings is forced to move faster than air below the wing. This creates...
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.

Birds have evolved many physical attributes that contribute to their flying ability. Wings are important, but adjustable tails, large hearts and light bones play critical roles.

To fly, birds, like airplanes, move air across their wings. Wings are designed so that air above the wings is forced to move faster than air below the wing. This creates higher pressure under the wings, called lift, which pushes the bird up. Different wing types evolved for different ways of flying. Prolonged flight requires long wings and an ability to soar. Other birds need superior maneuverability. Finches and sparrows

have short, broad wings. Faster birds, like hawks, have built-in spoilers that reduce turbulence while flying. This allows a steeper angle of attack without stalling.

Tails have evolved for specialized use. The tail acts like a rudder helping birds steer. Birds brake by spreading out their tails as they land. This adaptation allows them to make sudden, controlled stops-an essential skill, since most birds need to land on individual branches or on prey.

Flight takes muscle strength. If body builders has wings, they still could not flap hard enough to leave the ground. Birds have large, specialized hearts that beat much faster than the human heart and provide the necessary oxygen to the muscles. The breast muscle accounts for 15 percent of the bird’s body weight. On pigeons, it accounts for a third of their total body weight.

Birds carry no excess baggage; they have hollow feathers and hollow bones with struts inside to maintain strength, like cross beams in a bridge. Birds fly to find prey, escape predators, and attract mates-in other words, to survive

What is the main idea of the passage? 

A. Wings are the most important physical attribute of birds

B. Different wing styles evolved for different types of flight

C. Birds have many specialized features that aid in their survival

D. Birds fly for many reasons

1
8 tháng 12 2017

Chọn C

Kiến thức: Đọc hiểu

Giải thích:

Ý chính của bài đọc là gì?

  A. Cánh là thuộc tính vật lý quan trọng nhất của loài chim.

  B. Các kiểu cánh khác nhau phát triển các kiểu bay khác nhau.

  C. Loài chim có nhiều đặc điểm chuyên biệt hỗ trợ sự sống của chúng.

          D. Loài chim bay vì nhiều lý do

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.Birds have evolved many physical attributes that contribute to their flying ability. Wings are important, but adjustable tails, large hearts and light bones play critical roles.To fly, birds, like airplanes, move air across their wings. Wings are designed so that air above the wings is forced to move faster than air below the wing. This creates...
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.

Birds have evolved many physical attributes that contribute to their flying ability. Wings are important, but adjustable tails, large hearts and light bones play critical roles.

To fly, birds, like airplanes, move air across their wings. Wings are designed so that air above the wings is forced to move faster than air below the wing. This creates higher pressure under the wings, called lift, which pushes the bird up. Different wing types evolved for different ways of flying. Prolonged flight requires long wings and an ability to soar. Other birds need superior maneuverability. Finches and sparrows

have short, broad wings. Faster birds, like hawks, have built-in spoilers that reduce turbulence while flying. This allows a steeper angle of attack without stalling.

Tails have evolved for specialized use. The tail acts like a rudder helping birds steer. Birds brake by spreading out their tails as they land. This adaptation allows them to make sudden, controlled stops-an essential skill, since most birds need to land on individual branches or on prey.

Flight takes muscle strength. If body builders has wings, they still could not flap hard enough to leave the ground. Birds have large, specialized hearts that beat much faster than the human heart and provide the necessary oxygen to the muscles. The breast muscle accounts for 15 percent of the bird’s body weight. On pigeons, it accounts for a third of their total body weight.

Birds carry no excess baggage; they have hollow feathers and hollow bones with struts inside to maintain strength, like cross beams in a bridge. Birds fly to find prey, escape predators, and attract mates-in other words, to survive

According to the passage, what causes birds to rise when they start flying? 

A. Long wings with hollow feathers 

B. Higher air pressure below than above the wings 

C. Spreading out their tails 

D. Superior muscle strength 

1
5 tháng 4 2017

Chọn B

Kiến thức: Đọc hiểu

Giải thích:

Theo bài đọc, điều gì giúp nâng chim lên khi chúng bắt đầu bay?

  A. Cánh dài có lông rỗng                           

  B. Áp suất không khí bên dưới cánh cao hơn bên trên

  C. Việc xòe đuôi của chúng

  D. Sức lực cơ bắp vượt trội

Thông tin: This creates higher pressure under the wings, called lift, which pushes the bird up.

Tạm dịch: Điều này tạo ra áp lực lớn hơn ở dưới cánh, được gọi là lực nâng, đẩy chim lên

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.Birds have evolved many physical attributes that contribute to their flying ability. Wings are important, but adjustable tails, large hearts and light bones play critical roles.To fly, birds, like airplanes, move air across their wings. Wings are designed so that air above the wings is forced to move faster than air below the wing. This creates...
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.

Birds have evolved many physical attributes that contribute to their flying ability. Wings are important, but adjustable tails, large hearts and light bones play critical roles.

To fly, birds, like airplanes, move air across their wings. Wings are designed so that air above the wings is forced to move faster than air below the wing. This creates higher pressure under the wings, called lift, which pushes the bird up. Different wing types evolved for different ways of flying. Prolonged flight requires long wings and an ability to soar. Other birds need superior maneuverability. Finches and sparrows

have short, broad wings. Faster birds, like hawks, have built-in spoilers that reduce turbulence while flying. This allows a steeper angle of attack without stalling.

Tails have evolved for specialized use. The tail acts like a rudder helping birds steer. Birds brake by spreading out their tails as they land. This adaptation allows them to make sudden, controlled stops-an essential skill, since most birds need to land on individual branches or on prey.

Flight takes muscle strength. If body builders has wings, they still could not flap hard enough to leave the ground. Birds have large, specialized hearts that beat much faster than the human heart and provide the necessary oxygen to the muscles. The breast muscle accounts for 15 percent of the bird’s body weight. On pigeons, it accounts for a third of their total body weight.

Birds carry no excess baggage; they have hollow feathers and hollow bones with struts inside to maintain strength, like cross beams in a bridge. Birds fly to find prey, escape predators, and attract mates-in other words, to survive

What does the author imply about the body builders having wings?

A. If they flapped their wings, they could fly a little

B. If they had wings, their muscles would be strong enough for flight

C. If they had wings, their hearts would still not be large for flight

D. Their wings would total 15 percent of their body weight

1
26 tháng 10 2017

Chọn C

Kiến thức: Đọc hiểu

Giải thích:

Tác giả hàm ý gì về những lực sĩ có cánh?

  A. Nếu họ vỗ cánh, họ có thể bay một chút.

  B. Nếu họ có cánh, cơ bắp của họ sẽ đủ khỏe để bay.

  C. Nếu họ có cánh, trái tim của họ sẽ vẫn không lớn để bay được.

  D. Đôi cánh của họ sẽ chiếm 15% trọng lượng cơ thể.

Thông tin: If body builders has wings, they still could not flap hard enough to leave the ground. Birds have large, specialized hearts that beat much faster than the human heart and provide the necessary oxygen to the muscles.

Tạm dịch: Nếu lực sĩ có cánh, họ vẫn không thể vỗ đủ mạnh để rời khỏi mặt đất. Loài chim có trái tim lớn, chuyên biệt đập nhanh hơn nhiều so với trái tim con người và cung cấp oxy cần thiết cho cơ bắp.

Dịch bài đọc:

Chim đã phát triển nhiều thuộc tính vật lý để có được khả năng bay. Đôi cánh rất quan trọng, nhưng đuôi điều chỉnh được, trái tim lớn và xương nhẹ đóng vai trò quyết định.

Để bay, chim, cũng giống như máy bay, di chuyển không khí trên đôi cánh của chúng. Cánh được thiết kế sao cho không khí phía trên cánh buộc phải di chuyển nhanh hơn không khí bên dưới cánh. Điều này tạo ra áp lực lớn hơn ở dưới cánh, được gọi là lực nâng, đẩy chim lên. Các loại cánh khác nhau sẽ phát triển các cách bay khác nhau. Chuyến bay kéo dài đòi hỏi đôi cánh dài và khả năng bay vút lên. Các loài chim khác cần khả năng hoạt động mạnh hơn. Chim hoa mai và chim sẻ có đôi cánh ngắn và rộng. Những con chim nhanh hơn, như diều hâu, có tấm lái ngang được tích hợp sẵn giúp giảm nhiễu loạn trong khi bay. Điều này cho phép một góc độ tấn công dốc hơn mà không bị chao đảo.

Đuôi đã phát triển để sử dụng chuyên dụng. Đuôi hoạt động giống như một bánh lái giúp chim điều chỉnh hướng. Chim phanh lại bằng cách xòe đuôi khi chúng hạ cánh. Sự thích nghi này cho phép chúng dừng đột ngột nhưng có kiểm soát - một kỹ năng thiết yếu, vì hầu hết các loài chim cần phải đậu trên các nhánh cây riêng lẻ hoặc trên con mồi.

Chuyến bay mất sức lực của cơ bắp. Nếu lực sĩ có cánh, họ vẫn không thể vỗ đủ mạnh để rời khỏi mặt đất. Chim có trái tim lớn, chuyên biệt đập nhanh hơn nhiều so với trái tim con người và cung cấp oxy cần thiết cho cơ bắp. Cơ ngực chiếm 15% trọng lượng cơ thể của chim. Trên chim bồ câu, nó chiếm một phần ba tổng trọng lượng cơ thể của chúng.

Chim không mang theo hành lý quá mức; chúng có lông rỗng và xương rỗng với các thanh chống bên trong để duy trì sức lực, giống như xà ngang trong cây cầu. Chim bay để đến tìm con mồi, thoát khỏi kẻ săn mồi và thu hút bạn tình - nói cách khác là để sống sót

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 28 to 34.Most Americans look forward to their vacation. Most American employees receive an annual vacation with pay, and it is traditional to use this time off for travel.Travelling within the United States is very popular because foreign travel generally takes more time and money. Every year about thirteen million people travel abroad. The most popular...
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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 from 28 to 34.

Most Americans look forward to their vacation. Most American employees receive an annual vacation with pay, and it is traditional to use this time off for travel.

Travelling within the United States is very popular because foreign travel generally takes more time and money. Every year about thirteen million people travel abroad. The most popular periods are during the summer and the two-week school break on Christmas and New Year holidays. These periods are also the most crowded and the most expensive time to travel, so people who can adjust their schedules sometimes choose to travel in the autumn.

American tourists often travel by car. Most families own a car, and those who do not have a car can rent one. Cars are usually the most economical way to travel, especially for families. It is also fairly fast and convenient. Exellent highway with motels and restaurants nearby connect the nation’s major cities. They enable tourists to travel at a speed of 55 to 66 miles an hour. Tourists that want to travel faster often fly to their destination and then rent a car when they get there.
The word “It” in paragraph 3 refers to _______.

A. destination

B. restaurant

C. vacation

D. car

1
19 tháng 12 2019

Đáp án D

Cars are usually the most economical way to travel, especially for families. It is also fairly fast and convenient.” (Ô tô thường là phương tiện đi du lịch tiết kiệm nhất, đặc biệt là cho các gia đình. Nó cũng khá nhanh và thuận lợi.)

5 tháng 3 2019

Đáp án C

Kiến thức: Đọc hiểu, từ vựng

Giải thích: 

Jeopardy (n): ngu cơ                  Risk (n): nguy hiểm 

Threat (n): đe dọa            Danger (n): sự nguy hiểm 

(be) at risk: gặp nguy hiểm 

Tạm dịch:  

According to a new report, today's generation of children are in danger of getting so (40)_______ sleep that they are putting their mental and physical health  at (41)_______.

Theo một báo cáo mới, thế hệ trẻ em ngày nay đang gặp nguy hiểm vì ngủ quá ít đến mức họ đang có nguy cơ về sức khoẻ tinh thần và thể chất của mình.

28 tháng 5 2019

Đáp án C

Kiến thức: Đọc hiểu, từ vựng

Giải thích: 

Or: hoặc                           Whereas: trong khi 

Because: bởi vì                So: vì thế 

Tạm dịch:  

Adults can easily survive on seven to eight hours' sleep a night, (42)_______teenagers require nine or ten hours.

Người lớn có thể chỉ cần  từ 7 đến 8 tiếng ngủ mỗi đêm, trong khi thanh thiếu niên cần 9 đến 10 tiếng.

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 36 to 43. The difference between the nuclear family and the extended family is that a nuclear family refers to a single basic family unit of parents and their children, whereas the extended family refers to their relatives such as grandparents, in-laws, aunts and uncles, etc. In many cultures, and particularly indigenous societies, the latter is the most...
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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 from 36 to 43.

The difference between the nuclear family and the extended family is that a nuclear family refers to a single basic family unit of parents and their children, whereas the extended family refers to their relatives such as grandparents, in-laws, aunts and uncles, etc. In many cultures, and particularly indigenous societies, the latter is the most common basic form of social organization.

A nuclear family is limited, according to Kristy Jackson of Colorado State University, to one or two parents (e.g. a father and mother) and their own child, or children, living together in a single house or other dwellings. In anthropology, they only must be related in this fashion; there is no upper or lower limit on the number of children in a nuclear family.

The extended family is a much more nebulous term, but in essence refers to kin or relations not covered by the above definition. In historical Europe and Asia as well as in Middle Eastern, African, and South American Aboriginal cultures, extended family groups were typically the most basic unit of social organization, The term can differ in specific cultural settings, but generally includes people related in age or by lineage.

Anthropologically, the term "extended family" refers to such a group living together in a household, often with three generations living together (grandparents, parents, and children) and headed in patriarchal societies by the eldest man or by some other chosen leadership figure. However, in common parlance, the term "extended family" is often used by people simply to refer to their cousins, aunts, uncles, and so on, even though they are not living together in a single group.

Question 41: Which of the following is TRUE according to the passage?

A. Since the 20th century, more and more American couples have lived in extended families because of the financial burdens.

B. Nuclear families are the most basic form of social organization all over the world.

C. The popularity of nuclear families in western countries helps to stabilize family arrangement.

D. Traditional nuclear families have changed a lot over times.

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17 tháng 3 2018

Đáp án D

Câu nào dưới đây là Đúng theo đoạn văn?

A. Kể từ thế kỷ 20, ngày càng có nhiều cặp vợ chồng Mỹ sống trong các gia đình mở rộng vì gánh nặng tài chính.

B. Gia đình hạt nhân là hình thức cơ bản nhất của tổ chức xã hội trên toàn thế giới.

C. Sự phổ biến của các gia đình hạt nhân ở các nước phương Tây giúp ổn định sự sắp xếp gia đình.

D. Các gia đình hạt nhân truyền thống đã thay đổi rất nhiều theo thời gian.

Thông tin: The rapid growth in single-parent households, for instance, also represents a substantial change in the traditional nuclear family.