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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 29 to 33In the world today, particularly in the two most industrialized areas, North America and Europe, recycling is big news. People are talking about it, practicing it, and discovering new ways to be sensitive to the environment. Recycling means finding was to use products a second time. The motto of the recycling movement is "Reduce, Reuse, Recycle"....
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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 29 to 33

In the world today, particularly in the two most industrialized areas, North America and Europe, recycling is big news. People are talking about it, practicing it, and discovering new ways to be sensitive to the environment. Recycling means finding was to use products a second time. The motto of the recycling movement is "Reduce, Reuse, Recycle". The first step is to reduce garbage. In stores, a shopper has to buy products in blister packs, boxes and expensive plastic wrappings. A hamburger from a fast food restaurant comes in lots of packaging. usually paper, a box, and a bag. All that packaging is wasted resources. People should try to buy things that are wrapped simply, and to reuse cups and utensils. Another way to reduce waste is to buy high-quality products. When low quality appliances break, many customers throw them away and buy new ones - a loss of more resources and more energy. For example, if a customer buys a high-quality appliance that can be easily repaired, the manufacturer receives an important message. In the same way, if a customer chooses a product with less packaging, that customer sends an important message to the manufacturers. To reduce garbage, the throwaway must stop.

The second step is to reuse. It is better to buy juices and soft drinks in returnable bottles. After customers empty the bottles, they return them to the store. The manufacturers of the drinks collect the bottles, wash them, and then fill them again. The energy that is necessary to make new bottles is saved. In some parts of the world, returning bottles for money is a common practice. In those places, the garbage dumps have relatively little glass and plastic from throwaway bottles.

The third step is being environmentally sensitive is to recycle. Spent motor oil can be cleaned and used again. Aluminum cans are expensive to make. It takes the same amount of energy to make one aluminum can as it does to run a color TV set for three hours. When people collect and recycle aluminum (for new cans), they help save one of the world's precious resources.

What are the two things mentioned as examples of recycling?

A. Aluminum cans and plastic wrappings

B. Hamburger wrappings and spent motor oil

C. Aluminum cans and spent motor oil

D. TV sets and aluminum cans

1
8 tháng 11 2017

Chọn C

Spent motor oil can be cleaned and used again. Aluminum cans are expensive to make.

28 tháng 9 2018

Đáp án D

Dịch nghĩa: Hầu hết sinh viên đang phải vật lộn với các kỳ thi. Cậu ta đang thưởng thức không khí trong lành trên bãi biển.
= A. Hầu hết các sinh viên đang phải vật lộn với các kỳ thi trong khi cậu ta đang thưởng thức không khí trong lành trên bãi biển.
= B. Trong khi hầu hết các sinh viên đang phải vật lộn với các kỳ thi, cậu ta lại đang thưởng thức không khí trong lành trên bãi biển.
= C. Hầu hết các sinh viên đang phải vật lộn với các kỳ thi; trong khi đó, cậu ta đang thưởng thức không khí trong lành trên bãi biển.

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.           Choosing a career may be one of the hardest jobs you ever have, and it must be done with care. View a career as an opportunity to do something you love, not simply as a way to earn a living. Investing the time and effort to thoroughly explore your options can mean the difference between finding a stimulating and rewarding career and move from job...
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.

          Choosing a career may be one of the hardest jobs you ever have, and it must be done with care. View a career as an opportunity to do something you love, not simply as a way to earn a living. Investing the time and effort to thoroughly explore your options can mean the difference between finding a stimulating and rewarding career and move from job to unsatisfying job in an attempt to find the right one. Work influences virtually every aspect of your life, from your choice of friends to where you live. Here are just a few of the factors to consider.
          Deciding what matters most to you is essential to making the right decision. You may want to begin by assessing your likes, dislikes, strengths, and weaknesses. Think about the classes, hobbies, and surroundings that you find most appealing. Ask yourself questions, such as “Would you like to travel? Do you want to work with children? Are you more suited to solitary or cooperative work?” There are no right or wrong answers; only you know what is important to you. Determine which job features you require, which ones you would prefer, and which ones you cannot accept. Then rank them in order of importance to you.
          The setting of the job is one factor to take into account. You may not want to sit at a desk all day. If not, there are diversity occupation – building inspector, supervisor, real estate agent – that involve a great deal of time away from the office. Geographical location may be a concern, and employment in some fields in concentrated in certain regions. Advertising job can generally be found only in large cities. On the other hand, many industries such as hospitality, law education, and retail sales are found in all regions of the country.
          If a high salary is important to you, do not judge a career by its starting wages. Many jobs, such as insurance sales, offers relatively low starting salaries; however, pay substantially increases along with your experience, additional training, promotions and commission.
          Don’t rule out any occupation without learning more about it. Some industries evoke positive or negative associations. The traveling life of a flight attendant appears glamorous, while that of a plumber does not. Remember that many jobs are not what they appear to be at first, and may have merits or demerits that are less obvious. Flight attendants must work long, grueling hours without sleeps, whereas plumbers can be as highly paid as some doctors.
          Another point to consider is that as you mature, you will likely develop new interests and skills that may point the way to new opportunities. The choice you make today need not be your final one
.

It can be inferred from the paragraph 5 that ______.

A. jobs in insurance sales are generally not well-paid.

B. insurance sales people can earn high salary later in their career.

C. people should constantly work toward the next promotion.

D. a starting salary should be an important consideration in choosing a career.

1
22 tháng 2 2018

Đáp án B

Có thể suy luận từ đoạn 4 rằng ______.
A. các công việc trong lĩnh vực bảo hiểm thường không được trả lương cao.
B. người bán bảo hiểm có thể kiếm được mức lương cao trong sự nghiệp sau này của họ.
C. người ta nên liên tục làm việc cho sự thăng tiến tiếp theo.
D. mức lương khởi điểm phải là một thứ quan trọng cần cân nhắc trong việc lựa chọn nghề nghiệp.
Thông tin ở câu: “Many jobs, such as insurance sales, offers relatively low starting salaries; however, pay substantially increases along with your experience, additional training, promotions and commission.” (Nhiều công việc, chẳng hạn như ngành bán bảo hiểm, có mức lương khởi điểm tương đối thấp; tuy nhiên, tiền được trả sẽ tăng đáng kể cùng với kinh nghiệm của bạn, đào tạo bổ sung, khuyến mãi và hoa hồng.)

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 34 to 40.An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or materials adversely. Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established in England in the fourteenth...
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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 34 to 40.

An air pollutant is defined as a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or materials adversely. Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled - a far cry from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor might be considered an air pollutant under certain conditions.

Many of the more important air pollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentration of these pollutants was altered by various chemical reactions; they became components in biogeochemical cycles. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil. On a global basis, nature's output of these compounds dwarfs that resulting from human activities.

However, human production usually occurs in a localized area, such as a city. In such a region, human output may be dominant and may temporarily overload the natural purification scheme of the cycles. The result is an increased concentration of noxious chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact, the numerical value tells us little until we know how much of an increase this represents over the concentration that would occur naturally in the area. For example, sulfur dioxide has detectable health effects at 0.08 parts per million (ppm), which is about 400 times its natural level. Carbon monoxide, however, has a natural level of 0.1 ppm and is not usually a pollutant until its level reaches about 15 ppm.

It can be inferred from the first paragraph that _____.

A. water vapor is an air pollutant in localized areas

B. most air pollutants today can be seen or smelled 

C. the definition of air pollution will continue to change

D. a substance becomes an air pollutant only in cities

1
18 tháng 7 2017

Chọn C

Air pollution requires a very flexible definition that permits continuous change.

5 tháng 2 2017

Đáp án C

Kiến thức: Viết lại câu

Giải thích:

Tạm dịch: Những con chó quan sát chuồng gà. Chó bảo vệ gà khỏi chó sói.

A. Bảo vệ gà khỏi chó sói, những con chó quan sát những con gà khỏi chúng.

B. Chúng bảo vệ gà khỏi chó sói vì những con chó quan sát chuồng gà.

C. Những con chó quan sát chuồng gà để bảo vệ gà khỏi chó sói.

D. Quan sát chuồng gà vì chó bảo vệ gà khỏi chó sói.

Read the following pasage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questionsAny list of the greatest thinkers in history contains the name of the brilliant physicist Albert Einstein. His theories of relativity led to entirely new ways of thinking about time, space, matter, energy, and gravity. Einstein's work led to such scientific advances as the control of atomic energy, even television as a practical application of Einstein's work....
Đọc tiếp

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

Any list of the greatest thinkers in history contains the name of the brilliant physicist Albert Einstein. His theories of relativity led to entirely new ways of thinking about time, space, matter, energy, and gravity. Einstein's work led to such scientific advances as the control of atomic energy, even television as a practical application of Einstein's work.

In 1902 Einstein became an examiner in the Swiss patent office at Bern. In 1905, at age 26, he published the first of five major research papers. The first one provided a theory explaining Brownian movement, the zig-zag motion of microscopic particles in suspension. The second paper laid the foundation for the photon, or quantum, theory of light. In it he proposed that light is composed of separate packets of energy, called quanta or photons, that have some of the properties of particles and some of the properties of waves. A third paper contained the "special theory of relativity" which showed that time and motion are relative to the observer, if the speed of light is constant and the natural laws are the same everywhere in the universe. The fourth paper was a mathematical addition to the special theory of relativity. Here Einstein presented his famous formula, E = m(cc), known as the energy mass equivalence. In 1916, Einstein published his general theory of relativity. In it he proposed that gravity is not a force, but a curve in the space-time continuum, created by the presence of mass.

 

Einstein spoke out frequently against nationalism, the exalting of one nation above all others. He opposed war and violence and supported Zionism, the movement to establish a Jewish homeland in Palestine. When the Nazis came to power in 1933, they denounced his ideas. He then moved to the United States. In 1939 Einstein learned that two German chemists had split the uranium atom. Einstein wrote to President Franklind. Roosevelt warning him that this scientific knowledge could lead to Germany developing an atomic bomb. He suggested the United States begin its own atomic bomb research.

The word “exalting” in the passage is closest in meaning to

A. criticism

B. elimination

C. support

D. elevation

1
24 tháng 1 2018

Đáp án D

Kiến thức: Đọc hiểu

Giải thích:

Từ “exalting” trong đoạn văn gần nhất có nghĩa là

A. chỉ trích            B. loại bỏ              C. hỗ trợ     D. sự nâng lên, sự đưa lên

“exalting” = elevation

Einstein spoke out frequently against nationalism, the exalting of one nation above all others. (Einstein thường xuyên nói chuyện chống lại chủ nghĩa dân tộc, sự nổi lên của một quốc gia trên tất cả các nước khác.)

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.           Choosing a career may be one of the hardest jobs you ever have, and it must be done with care. View a career as an opportunity to do something you love, not simply as a way to earn a living. Investing the time and effort to thoroughly explore your options can mean the difference between finding a stimulating and rewarding career and move from job...
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.

          Choosing a career may be one of the hardest jobs you ever have, and it must be done with care. View a career as an opportunity to do something you love, not simply as a way to earn a living. Investing the time and effort to thoroughly explore your options can mean the difference between finding a stimulating and rewarding career and move from job to unsatisfying job in an attempt to find the right one. Work influences virtually every aspect of your life, from your choice of friends to where you live. Here are just a few of the factors to consider.
          Deciding what matters most to you is essential to making the right decision. You may want to begin by assessing your likes, dislikes, strengths, and weaknesses. Think about the classes, hobbies, and surroundings that you find most appealing. Ask yourself questions, such as “Would you like to travel? Do you want to work with children? Are you more suited to solitary or cooperative work?” There are no right or wrong answers; only you know what is important to you. Determine which job features you require, which ones you would prefer, and which ones you cannot accept. Then rank them in order of importance to you.
          The setting of the job is one factor to take into account. You may not want to sit at a desk all day. If not, there are diversity occupation – building inspector, supervisor, real estate agent – that involve a great deal of time away from the office. Geographical location may be a concern, and employment in some fields in concentrated in certain regions. Advertising job can generally be found only in large cities. On the other hand, many industries such as hospitality, law education, and retail sales are found in all regions of the country.
          If a high salary is important to you, do not judge a career by its starting wages. Many jobs, such as insurance sales, offers relatively low starting salaries; however, pay substantially increases along with your experience, additional training, promotions and commission.
          Don’t rule out any occupation without learning more about it. Some industries evoke positive or negative associations. The traveling life of a flight attendant appears glamorous, while that of a plumber does not. Remember that many jobs are not what they appear to be at first, and may have merits or demerits that are less obvious. Flight attendants must work long, grueling hours without sleeps, whereas plumbers can be as highly paid as some doctors.
          Another point to consider is that as you mature, you will likely develop new interests and skills that may point the way to new opportunities. The choice you make today need not be your final one
.

According to paragraph 3, which of the following fields is NOT suitable for a person who does not want to live in a big city?

A. plumbing        

B. law         

C. retail sales         

D. advertising

1
14 tháng 7 2018

Đáp án D

Theo đoạn 3, lĩnh vực nào sau đây KHÔNG thích hợp cho một người không muốn sống ở một thành phố lớn?
A. plumbing (n): sửa ống nước
B. law (n): luật
C. retail sales: bán lẻ
D. advertising (n): ngành quảng cáo
Thông tin ở câu: “Advertising job can generally be found only in large cities.” (Công việc quảng cáo nói chung chỉ có thể tìm thấy ở các thành phố lớn)

Read the following pasage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questionsAny list of the greatest thinkers in history contains the name of the brilliant physicist Albert Einstein. His theories of relativity led to entirely new ways of thinking about time, space, matter, energy, and gravity. Einstein's work led to such scientific advances as the control of atomic energy, even television as a practical application of Einstein's work....
Đọc tiếp

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

Any list of the greatest thinkers in history contains the name of the brilliant physicist Albert Einstein. His theories of relativity led to entirely new ways of thinking about time, space, matter, energy, and gravity. Einstein's work led to such scientific advances as the control of atomic energy, even television as a practical application of Einstein's work.

In 1902 Einstein became an examiner in the Swiss patent office at Bern. In 1905, at age 26, he published the first of five major research papers. The first one provided a theory explaining Brownian movement, the zig-zag motion of microscopic particles in suspension. The second paper laid the foundation for the photon, or quantum, theory of light. In it he proposed that light is composed of separate packets of energy, called quanta or photons, that have some of the properties of particles and some of the properties of waves. A third paper contained the "special theory of relativity" which showed that time and motion are relative to the observer, if the speed of light is constant and the natural laws are the same everywhere in the universe. The fourth paper was a mathematical addition to the special theory of relativity. Here Einstein presented his famous formula, E = m(cc), known as the energy mass equivalence. In 1916, Einstein published his general theory of relativity. In it he proposed that gravity is not a force, but a curve in the space-time continuum, created by the presence of mass.

Einstein spoke out frequently against nationalism, the exalting of one nation above all others. He opposed war and violence and supported Zionism, the movement to establish a Jewish homeland in Palestine. When the Nazis came to power in 1933, they denounced his ideas. He then moved to the United States. In 1939 Einstein learned that two German chemists had split the uranium atom. Einstein wrote to President Franklind. Roosevelt warning him that this scientific knowledge could lead to Germany developing an atomic bomb. He suggested the United States begin its own atomic bomb research.

It is clear from the tone of the passage that the author feels

A. Einstein's work in physics was somewhat tarnished by his conservative political views

B. Einstein's work in physics, though theoretically impressive, led to few practical applications.

C. Albert Einstein was one of the most brilliant thinkers in history.

D. Einstein's theories have been consistently proven incorrect.

1
23 tháng 6 2019

Đáp án C

Kiến thức: Đọc hiểu

Giải thích:

Rõ ràng từ giọng điệu của đoạn văn tác giả cảm thấy

A. Nghiên cứu của Einstein về vật lý đã bị lu mờ bởi quan điểm chính trị bảo thủ của ông.

B. Nghiên cứu của Einstein về vật lý, mặc dù ấn tượng về mặt lý thuyết, dẫn đến một số ứng dụng thực tiễn.

C. Albert Einstein là một trong những nhà tư tưởng xuất sắc nhất trong lịch sử.

D. Các lý thuyết của Einstein đã được chứng minh là không chính xác.

Thông tin: Any list of the greatest thinkers in history contains the name of the brilliant physicist Albert Einstein. His theories of relativity led to entirely new ways of thinking about time, space, matter, energy, and gravity. (Bất kỳ danh sách những nhà tư tưởng vĩ đại nhất nào trong lịch sử đều có tên của nhà vật lý học xuất sắc Albert Einstein. Lý thuyết tương đối của ông đã dẫn đến những cách suy nghĩ hoàn toàn mới về thời gian, không gian, vật chất, năng lượng và trọng lực.)

Read the following pasage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questionsAny list of the greatest thinkers in history contains the name of the brilliant physicist Albert Einstein. His theories of relativity led to entirely new ways of thinking about time, space, matter, energy, and gravity. Einstein's work led to such scientific advances as the control of atomic energy, even television as a practical application of Einstein's work....
Đọc tiếp

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

Any list of the greatest thinkers in history contains the name of the brilliant physicist Albert Einstein. His theories of relativity led to entirely new ways of thinking about time, space, matter, energy, and gravity. Einstein's work led to such scientific advances as the control of atomic energy, even television as a practical application of Einstein's work.

In 1902 Einstein became an examiner in the Swiss patent office at Bern. In 1905, at age 26, he published the first of five major research papers. The first one provided a theory explaining Brownian movement, the zig-zag motion of microscopic particles in suspension. The second paper laid the foundation for the photon, or quantum, theory of light. In it he proposed that light is composed of separate packets of energy, called quanta or photons, that have some of the properties of particles and some of the properties of waves. A third paper contained the "special theory of relativity" which showed that time and motion are relative to the observer, if the speed of light is constant and the natural laws are the same everywhere in the universe. The fourth paper was a mathematical addition to the special theory of relativity. Here Einstein presented his famous formula, E = m(cc), known as the energy mass equivalence. In 1916, Einstein published his general theory of relativity. In it he proposed that gravity is not a force, but a curve in the space-time continuum, created by the presence of mass.

 

Einstein spoke out frequently against nationalism, the exalting of one nation above all others. He opposed war and violence and supported Zionism, the movement to establish a Jewish homeland in Palestine. When the Nazis came to power in 1933, they denounced his ideas. He then moved to the United States. In 1939 Einstein learned that two German chemists had split the uranium atom. Einstein wrote to President Franklind. Roosevelt warning him that this scientific knowledge could lead to Germany developing an atomic bomb. He suggested the United States begin its own atomic bomb research.

According to Einstein, light is composed of separate packets of energy called

A. electrons

B. photoelectrons

C. gamma rays

D. quanta

1
22 tháng 11 2018

Đáp án D

Kiến thức: Đọc hiểu

Giải thích:

Theo Einstein, ánh sáng bao gồm các gói năng lượng riêng gọi là

A. electron                               B. photoelectrons (quang điện)

C. tia gamma                                     D. quanta (lượng tử)

Thông tin: In it he proposed that light is composed of separate packets of energy, called quanta or photons, that have some of the properties of particles and some of the properties of waves. (Trong đó, ông đề xuất rằng ánh sáng bao gồm các gói năng lượng riêng biệt, gọi là quanta hoặc photon, có một số tính chất của các hạt và một số đặc tính của sóng.)

Dịch bài đọc:

Bất kỳ danh sách những nhà tư tưởng vĩ đại nhất nào trong lịch sử đều có tên của nhà vật lý học xuất sắc Albert Einstein. Lý thuyết tương đối của ông đã dẫn đến những cách suy nghĩ hoàn toàn mới về thời gian, không gian, vật chất, năng lượng và trọng lực. Công trình nghiên cứu của Einstein đã dẫn tới những tiến bộ khoa học như việc kiểm soát năng lượng nguyên tử, thậm chí cả ti vi như một ứng dụng thực tiễn của công trình nghiên cứu của Einstein.

Năm 1902 Einstein trở thành giám khảo tại văn phòng bằng sáng chế của Thụy Sĩ tại Bern. Năm 1905, ở tuổi 26, ông đã xuất bản bài đầu tiên trong năm bài báo nghiên cứu chính. Bài đầu tiên cung cấp một lý thuyết giải thích phong trào Browni, chuyển động zig-zag của các hạt cực nhỏ trong hệ thống treo. Bài báo thứ hai đặt nền móng cho photon, hoặc lượng tử, lý thuyết về ánh sáng. Trong đó, ông đề xuất rằng ánh sáng bao gồm các gói năng lượng riêng biệt, gọi là quanta hoặc photon, có một số tính chất của các hạt và một số đặc tính của sóng.

Bài báo thứ ba chứa "lý thuyết tương đối đặc biệt" cho thấy thời gian và chuyển động tương đối so với người quan sát, nếu tốc độ ánh sáng không đổi và luật tự nhiên ở mọi nơi trong vũ trụ đều giống nhau. Bài báo thứ tư là một bổ sung toán học cho lý thuyết tương đối đặc biệt. Ở đây, Einstein trình bày công thức nổi tiếng của ông, E = m(cc), được gọi là sự tương đương khối lượng-năng lượng. Năm 1916, Einstein công bố thuyết tương đối tổng quát của ông. Trong đó ông đề xuất rằng lực hấp dẫn không phải là lực, nhưng là một đường cong trong không gian-thời gian liên tục, được tạo ra bởi sự hiện diện của khối lượng.

Einstein thường xuyên nói chuyện chống lại chủ nghĩa dân tộc, sự nổi lên của một quốc gia trên tất cả các nước khác. Ông đã phản đối chiến tranh và bạo lực và ủng hộ chủ nghĩa Zion, phong trào thiết lập một quê hương Do Thái ở Palestine. Khi phát xít Đức lên nắm quyền vào năm 1933, họ lên án những ý tưởng của ông. Sau đó ông chuyển đến Hoa Kỳ. Năm 1939 Einstein đã biết được rằng hai nhà hóa học người Đức đã phân chia nguyên tử urani. Einstein đã viết cho Tổng thống Franklin D. Roosevelt cảnh báo ông rằng kiến thức khoa học này có thể dẫn đến việc Đức phát triển một quả bom nguyên tử. Ông đề nghị Hoa Kỳ bắt đầu nghiên cứu bom nguyên tử của họ.

22 tháng 5 2019

Đáp án D

Kiến thức: Phrasal verb

Giải thích:

come off (v): diễn ra, rời ra, té

put out (v): truyền tín hiệu, dập tắt (ngọn lửa, điếu thuốc lá,..)

switch off (v): cúp, ngắt điện

go out (v): (trong câu này) tắt (đèn, lửa…)

Tạm dịch: Khi đèn tắt, chúng tôi không thể thấy gì cả.