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3 tháng 12 2018

Đáp án C

Kiến thức về thì động từ

By + trạng từ thời gian của tương lai => chia thì tương lại hoàn thành

By + trạng từ thời gian của quá khứ => chia thì quá khứ hoàn thành

Căn cứ vào " by tomorrow" nên câu này phải chia thì tương lai hoàn thành

Tạm dịch: Ngày mai tớ sẽ đọc xong cuốn sách về trí tuệ nhân tạo, sau đó thì cậu có thể mượn nó.

Read the following passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.  Over the next 20 to 50 years, it will become harder to tell the (26) _______ between the human and the machine. All, body part will be replaceable. Computers will function like the human brain with the ability to recognize feelings and respond in a feeling way. They will then produce fake people. We will then be able to create a machine duplicate of ourselves (27) _______ we will appear to...
Đọc tiếp

Read the following passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.

 Over the next 20 to 50 years, it will become harder to tell the (26) _______ between the human and the machine. All, body part will be replaceable. Computers will function like the human brain with the ability to recognize feelings and respond in a feeling way. They will then produce fake people. We will then be able to create a machine duplicate of ourselves (27) _______ we will appear to be alive long after we are dead. Maybe a few decades later, a way will be found to transfer our spirit, including our memories and thoughts, to the new body. Then we can choose to live for as long as we want. It might be expensive. When it becomes possible to do a spirit transfer, they will find (28) _______ to do them automatically. So we will be able to reside within whichever duplicate we want, whenever we want.

 Miniature robots will be built (29) _______ through your blood stream and repair damage. Also, larger robots will be used when you are sick. When you have an upset stomach, you will swallow a very small cherry tasting robot which will travel through your stomach taking video of the mess. It will be set up like a video game, so you can control the exploring and the selection of images. Then you can replay the video to help a doctor (30) _______ your illness, or to prove to your employer that you really, were sick.

Điền vào ô 28

A. over

B. out

C. down

D. up

1
8 tháng 4 2018

Đáp án B

Kiến thức: từ vựng

Giải thích: to find out: tìm ra

Read the following passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.  Over the next 20 to 50 years, it will become harder to tell the (26) _______ between the human and the machine. All, body part will be replaceable. Computers will function like the human brain with the ability to recognize feelings and respond in a feeling way. They will then produce fake people. We will then be able to create a machine duplicate of ourselves (27) _______ we will appear to...
Đọc tiếp

Read the following passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.

 Over the next 20 to 50 years, it will become harder to tell the (26) _______ between the human and the machine. All, body part will be replaceable. Computers will function like the human brain with the ability to recognize feelings and respond in a feeling way. They will then produce fake people. We will then be able to create a machine duplicate of ourselves (27) _______ we will appear to be alive long after we are dead. Maybe a few decades later, a way will be found to transfer our spirit, including our memories and thoughts, to the new body. Then we can choose to live for as long as we want. It might be expensive. When it becomes possible to do a spirit transfer, they will find (28) _______ to do them automatically. So we will be able to reside within whichever duplicate we want, whenever we want.

 Miniature robots will be built (29) _______ through your blood stream and repair damage. Also, larger robots will be used when you are sick. When you have an upset stomach, you will swallow a very small cherry tasting robot which will travel through your stomach taking video of the mess. It will be set up like a video game, so you can control the exploring and the selection of images. Then you can replay the video to help a doctor (30) _______ your illness, or to prove to your employer that you really, were sick.

Điền vào ô 27

A. because

B. soon

C. but

D. so

1
24 tháng 2 2017

Đáp án D

Kiến thức: từ vựng

Giải thích:

because: bởi vì                                      soon: sớm

but: nhưng                      so: vì vậy

Read the following passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.  Over the next 20 to 50 years, it will become harder to tell the (26) _______ between the human and the machine. All, body part will be replaceable. Computers will function like the human brain with the ability to recognize feelings and respond in a feeling way. They will then produce fake people. We will then be able to create a machine duplicate of ourselves (27) _______ we will appear to...
Đọc tiếp

Read the following passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.

 Over the next 20 to 50 years, it will become harder to tell the (26) _______ between the human and the machine. All, body part will be replaceable. Computers will function like the human brain with the ability to recognize feelings and respond in a feeling way. They will then produce fake people. We will then be able to create a machine duplicate of ourselves (27) _______ we will appear to be alive long after we are dead. Maybe a few decades later, a way will be found to transfer our spirit, including our memories and thoughts, to the new body. Then we can choose to live for as long as we want. It might be expensive. When it becomes possible to do a spirit transfer, they will find (28) _______ to do them automatically. So we will be able to reside within whichever duplicate we want, whenever we want.

 Miniature robots will be built (29) _______ through your blood stream and repair damage. Also, larger robots will be used when you are sick. When you have an upset stomach, you will swallow a very small cherry tasting robot which will travel through your stomach taking video of the mess. It will be set up like a video game, so you can control the exploring and the selection of images. Then you can replay the video to help a doctor (30) _______ your illness, or to prove to your employer that you really, were sick.

Điền vào ô 29

A. travelling

B. to be travelled

C. to travel

D. travel

1
27 tháng 12 2018

Đáp án C

Kiến thức: từ vựng

Giải thích: Giữa hai động từ thường có giới từ “to”.

Read the following passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.  Over the next 20 to 50 years, it will become harder to tell the (26) _______ between the human and the machine. All, body part will be replaceable. Computers will function like the human brain with the ability to recognize feelings and respond in a feeling way. They will then produce fake people. We will then be able to create a machine duplicate of ourselves (27) _______ we will appear to...
Đọc tiếp

Read the following passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.

 Over the next 20 to 50 years, it will become harder to tell the (26) _______ between the human and the machine. All, body part will be replaceable. Computers will function like the human brain with the ability to recognize feelings and respond in a feeling way. They will then produce fake people. We will then be able to create a machine duplicate of ourselves (27) _______ we will appear to be alive long after we are dead. Maybe a few decades later, a way will be found to transfer our spirit, including our memories and thoughts, to the new body. Then we can choose to live for as long as we want. It might be expensive. When it becomes possible to do a spirit transfer, they will find (28) _______ to do them automatically. So we will be able to reside within whichever duplicate we want, whenever we want.

 Miniature robots will be built (29) _______ through your blood stream and repair damage. Also, larger robots will be used when you are sick. When you have an upset stomach, you will swallow a very small cherry tasting robot which will travel through your stomach taking video of the mess. It will be set up like a video game, so you can control the exploring and the selection of images. Then you can replay the video to help a doctor (30) _______ your illness, or to prove to your employer that you really, were sick.

Điền vào ô 30

A. watch

B. observe

C. notice

D. diagnose

1
10 tháng 7 2018

Đáp án D

Kiến thức: từ vựng

Giải thích:

A. watch (v): quan sát                           B. observe (v): xem      

C. notice (v): chú ý                               D. diagnose (v): chu n đoán (bệnh)

Dịch bài đọc:

Trong 20-50 năm tới, nói về sự khác biệt giữa con người và máy móc sẽ trở nên khó khăn hơn. Tất cả bộ phận cơ thể sẽ được thay thế. Máy tính sẽ hoạt động giống như bộ não con người có khả năng nhận ra những cảm xúc và trả lời bằng cảm xúc. Tiếp đó máy tính sẽ sản xuất ra người giả. Sau đó, chúng ta sẽ có thể tạo ra một bản sao thiết bị của chính mình vì vậy chúng ta sẽ xuất hiện trong trạng thái sống lâu hơn sau khi chúng ta chết. Có lẽ một vài thập kỷ sau đó, sẽ tìm thấy cách để dịch chuyển linh hồn của chúng ta, bao gồm những kỷ niệm và những suy nghĩ, đến cơ thể mới của chúng ta. Sau đó chúng ta có thể chọn sống bao lâu chúng ta muốn. Có thể nó sẽ đắt tiền. Khi có thể chuyển linh hồn, họ sẽ tìm ra cách để làm cho chúng tự động. Vì vậy, chúng ta sẽ có thể cư trú trong bất cứ bản sao chúng ta muốn, bất cứ khi nào chúng tôi muốn.

Robot thu nhỏ sẽ được tạo dựng để di chuyển thông qua dòng máu của bạn và chữa lành các tổn thương. Ngoài ra, robot lớn hơn sẽ được sử dụng khi bạn đang bị bệnh. Khi bạn đau bụng, bạn sẽ nuốt một robot có vị anh đào và nó sẽ đi di chuyển thông qua dạ dày của bạn để thu hình. Nó sẽ được thiết lập như một trò chơi ghi hình, vì vậy bạn có thể kiểm soát sự khám phá và việc lựa chọn các hình ảnh. Sau đó bạn có thể xem lại đoạn băng để giúp bác sĩ ch n đoán bệnh tật của bạn, hoặc để chứng minh cho ông chủ của bạn rằng bạn thực sự, bị ốm.

Read the following passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.  Over the next 20 to 50 years, it will become harder to tell the (26) _______ between the human and the machine. All, body part will be replaceable. Computers will function like the human brain with the ability to recognize feelings and respond in a feeling way. They will then produce fake people. We will then be able to create a machine duplicate of ourselves (27) _______ we will appear to...
Đọc tiếp

Read the following passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.

 Over the next 20 to 50 years, it will become harder to tell the (26) _______ between the human and the machine. All, body part will be replaceable. Computers will function like the human brain with the ability to recognize feelings and respond in a feeling way. They will then produce fake people. We will then be able to create a machine duplicate of ourselves (27) _______ we will appear to be alive long after we are dead. Maybe a few decades later, a way will be found to transfer our spirit, including our memories and thoughts, to the new body. Then we can choose to live for as long as we want. It might be expensive. When it becomes possible to do a spirit transfer, they will find (28) _______ to do them automatically. So we will be able to reside within whichever duplicate we want, whenever we want.

 Miniature robots will be built (29) _______ through your blood stream and repair damage. Also, larger robots will be used when you are sick. When you have an upset stomach, you will swallow a very small cherry tasting robot which will travel through your stomach taking video of the mess. It will be set up like a video game, so you can control the exploring and the selection of images. Then you can replay the video to help a doctor (30) _______ your illness, or to prove to your employer that you really, were sick.

Điền vào ô 26

A. change

B. difference

C. appearance

D. variety

1
4 tháng 9 2019

Đáp án B

Kiến thức: từ vựng

Giải thích:

A. change (n): sự thay đổi                     B. difference (n): sự khác biệt  

C. appearance  (n): sự xuất hiện         D. variety (n): sự đa dạng

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 35 to 42. What picture do you have of the future? Will life in the future be better, worse or the same as now? What do you hope about the future? Futurologists predict that life will probably be very different in 2050 in all the fields, from entertainment to technology. First of all, it seems that TV channels will have disappeared. Instead, people will...
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 from 35 to 42.

What picture do you have of the future? Will life in the future be better, worse or the same as now? What do you hope about the future?

Futurologists predict that life will probably be very different in 2050 in all the fields, from entertainment to technology. First of all, it seems that TV channels will have disappeared. Instead, people will choose a program from a 'menu' and a computer will send the program directly to the television. Today, we can use the World Wide Web to read newspaper stories and see pictures on a computer thousands of kilometers away. By 2050, music, films, programs, newspapers and books will come to us by computer.

In what concerns the environment, water will have become one of our most serious problems. In many places, agriculture is changing and farmers are growing fruit and vegetables to export. This uses a lot of water. Demand for water will increase ten times between now and 2050 and there could be serious shortages. Some futurologists predict that water could be the cause of war if we don't act now.

In transport, cars running on new, clean fuels will have computers to control the speed and there won't be any accidents. Today, many cars have computers that tell drivers exactly where they are. By 2050, the computer will control the car and drive it to your destination. On the other hand, space planes will take people halfway around the world in two hours. Nowadays, the United States Shuttle can go into space and land on Earth again. By 2050, space planes will fly all over the world and people will fly from Los Angeles to Tokyo in just two hours.

In the domain of technology, robots will have replaced people in factories. Many factories already use robots. Big companies prefer robots - they do not ask for pay rises or go on strike, and they work 24 hours a day. By 2050, we will see robots everywhere - in factories, schools, offices, hospitals, shops and homes.

Last but not least, medicine technology will have conquered many diseases. Today, there are electronic devices that connect directly to the brain to help people hear. By 2050, we will be able to help blind and deaf people see and hear again. Scientists have discovered how to control genes. They have already

produced clones of animals. By 2050, scientists will be able to produce clones of people and decide how they look, how they behave and how much intelligence they have.

What can be inferred about the life in 2050 according to the passage?

A. Life in 2050 will be much better than that of today

B. TV will be an indispensable means of communication and business

C. People will not suffer from the shortage of water due to the polar melting

D. The deaf will not have to depend any longer on the electronic hearing devices

1
27 tháng 3 2019

Có thể được suy luận gì về cuộc sống vào năm 2050 theo bài đọc?

A. Cuộc sống vào năm 2050 sẽ tốt hơn nhiều so với ngày nay.

B. TV sẽ là một phương tiện truyền thông và kinh doanh không thể thiếu.

C. Mọi người sẽ không bị thiếu nước do sự tan chảy của các tảng băng ở hai cực.

D. Người điếc sẽ không phải phụ thuộc lâu hơn vào các thiết bị trợ thính điện tử.

Thông tin: Today, there are electronic devices that connect directly to the brain to help people hear. By 2050, we will be able to help blind and deaf people see and hear again. Scientists have discovered how to

control genes. They have already produced clones of animals. By 2050, scientists will be able to produce clones of people and decide how they look, how they behave and how much intelligence they have.

Tạm dịch: Ngày nay, có những thiết bị điện tử kết nối trực tiếp với não để giúp mọi người nghe. Đến năm 2050, chúng ta sẽ có thể giúp những người mù và điếc nhìn và nghe lại. Các nhà khoa học đã khám phá ra cách kiểm soát gen. Họ đã tạo ra các bản sao của động vật. Đến năm 2050, các nhà khoa học sẽ có thể tạo ra bản sao của con người và quyết định cách họ nhìn, cách họ hành xử và mức độ thông minh của họ.

- In what concerns the environment, water will have become one of our most serious problems. In many places, agriculture is changing and farmers are growing fruit and vegetables to export. This uses a lot of water. Demand for water will increase ten times between now and 2050 and there could be serious shortages. => loại C

Chọn D

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. What picture do you have of the future? Will life in the future be better, worse or the same as now? What do you hope about the future? Futurologists predict that life will probably be very different in 2050 in all the fields, from entertainment to technology. First of all, it seems that TV channels will have disappeared. Instead, people will choose a...
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.

What picture do you have of the future? Will life in the future be better, worse or the same as now? What do you hope about the future?

Futurologists predict that life will probably be very different in 2050 in all the fields, from entertainment to technology. First of all, it seems that TV channels will have disappeared. Instead, people will choose a program from a 'menu' and a computer will send the program directly to the television. Today, we can use the World Wide Web to read newspaper stories and see pictures on a computer thousands of kilometers away. By 2050, music, films, programs, newspapers and books will come to us by computer.

In what concerns the environment, water will have become one of our most serious problems. In many places, agriculture is changing and farmers are growing fruit and vegetables to export. This uses a lot of water. Demand for water will increase ten times between now and 2050 and there could be serious shortages. Some futurologists predict that water could be the cause of war if we don't act now.

In transport, cars running on new, clean fuels will have computers to control the speed and there won't be any accidents. Today, many cars have computers that tell drivers exactly where they are. By 2050, the computer will control the car and drive it to your destination. On the other hand, space planes will take people halfway around the world in two hours. Nowadays, the United States Shuttle can go into space and land on Earth again. By 2050, space planes will fly all over the world and people will fly from Los Angeles to Tokyo in just two hours.

In the domain of technology, robots will have replaced people in factories. Many factories already use robots. Big companies prefer robots - they do not ask for pay rises or go on strike, and they work 24 hours a day. By 2050, we will see robots everywhere - in factories, schools, offices, hospitals, shops and homes.

Last but not least, medicine technology will have conquered many diseases. Today, there are electronic devices that connect directly to the brain to help people hear. By 2050, we will be able to help blind and deaf people see and hear again. Scientists have discovered how to control genes. They have already produced clones of animals. By 2050, scientists will be able to produce clones of people and decide how they look, how they behave and how much intelligence they have. 

What can be inferred about the life in 2050 according to the passage?

A. Life in 2050 will be much better than that of today

B. TV will be an indispensable means of communication and business.

C. People will not suffer from the shortage of water due to the polar melting. 

D. The deaf will not have to depend any longer on the electronic hearing devices

1
13 tháng 11 2017

Kiến thức: Đọc hiểu

Giải thích:

Điều gì có thể được suy luận về cuộc sống vào năm 2050 theo đoạn văn?

    A. Cuộc sống vào năm 2050 sẽ tốt hơn nhiều so với ngày nay.

    B. TV sẽ là một phương tiện truyền thông và kinh doanh không thể thiếu.

    C. Mọi người sẽ không bị thiếu nước bởi vì sự tan chảy băng.

    D. Người điếc sẽ không phải phụ thuộc lâu hơn vào các thiết bị trợ thính điện tử.

Thông tin: By 2050, we will be able to help blind and deaf people see and hear again.

Tạm dịch: Đến năm 2050, chúng ta sẽ có thể giúp những người mù và điếc nhìn và nghe lại.

Chọn D

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 35 to 42.What picture do you have of the future? Will life in the future be better, worse or the same as now? What do you hope about the future?Futurologists predict that life will probably be very different in 2050 in all the fields, from entertainment to technology. First of all, it seems that TV channels will have disappeared. Instead, people will...
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 from 35 to 42.

What picture do you have of the future? Will life in the future be better, worse or the same as now? What do you hope about the future?

Futurologists predict that life will probably be very different in 2050 in all the fields, from entertainment to technology. First of all, it seems that TV channels will have disappeared. Instead, people will choose a program from a 'menu' and a computer will send the program directly to the television. Today, we can use the World Wide Web to read newspaper stories and see pictures on a computer thousands of kilometers away. By 2050, music, films, programs, newspapers and books will come to us by computer.

In what concerns the environment, water will have become one of our most serious problems. In many places, agriculture is changing and farmers are growing fruit and vegetables to export. This uses a lot of water. Demand for water will increase ten times between now and 2050 and there could be serious shortages. Some futurologists predict that water could be the cause of war if we don't act now.

In transport, cars running on new, clean fuels will have computers to control the speed and there won't be any accidents. Today, many cars have computers that tell drivers exactly where they are. By 2050, the computer will control the car and drive it to your destination. On the other hand, space planes will take people halfway around the world in two hours. Nowadays, the United States Shuttle can go into space and land on Earth again. By 2050, space planes will fly all over the world and people will fly from Los Angeles to Tokyo in just two hours.

In the domain of technology, robots will have replaced people in factories. Many factories already use robots. Big companies prefer robots - they do not ask for pay rises or go on strike, and they work 24 hours a day. By 2050, we will see robots everywhere - in factories, schools, offices, hospitals, shops and homes.

Last but not least, medicine technology will have conquered many diseases. Today, there are electronic devices that connect directly to the brain to help people hear. By 2050, we will be able to help blind and deaf people see and hear again. Scientists have discovered how to control genes. They have already

produced clones of animals. By 2050, scientists will be able to produce clones of people and decide how they look, how they behave and how much intelligence they have

What can be inferred about the life in 2050 according to the passage? 

A. Life in 2050 will be much better than that of today

B. TV will be an indispensable means of communication and business

C. People will not suffer from the shortage of water due to the polar melting

D. The deaf will not have to depend any longer on the electronic hearing devices

1
8 tháng 5 2018

Chọn D

Có thể được suy luận gì về cuộc sống vào năm 2050 theo bài đọc?

  A. Cuộc sống vào năm 2050 sẽ tốt hơn nhiều so với ngày nay.

  B. TV sẽ là một phương tiện truyền thông và kinh doanh không thể thiếu.

  C. Mọi người sẽ không bị thiếu nước do sự tan chảy của các tảng băng ở hai cực.

  D. Người điếc sẽ không phải phụ thuộc lâu hơn vào các thiết bị trợ thính điện tử.

Thông tin: Today, there are electronic devices that connect directly to the brain to help people hear. By 2050, we will be able to help blind and deaf people see and hear again. Scientists have discovered how to

control genes. They have already produced clones of animals. By 2050, scientists will be able to produce clones of people and decide how they look, how they behave and how much intelligence they have.

Tạm dịch: Ngày nay, có những thiết bị điện tử kết nối trực tiếp với não để giúp mọi người nghe. Đến năm 2050, chúng ta sẽ có thể giúp những người mù và điếc nhìn và nghe lại. Các nhà khoa học đã khám phá ra cách kiểm soát gen. Họ đã tạo ra các bản sao của động vật. Đến năm 2050, các nhà khoa học sẽ có thể tạo ra bản sao của con người và quyết định cách họ nhìn, cách họ hành xử và mức độ thông minh của họ.

- In what concerns the environment, water will have become one of our most serious problems. In many places, agriculture is changing and farmers are growing fruit and vegetables to export. This uses a lot of water. Demand for water will increase ten times between now and 2050 and there could be serious shortages. => loại C 

Read the following passage on transport, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50.     The Sun today is a yellow dwarf star. It is fueled by thermonuclear reactions near its center that convert hydrogen to helium. The Sun has existed in its present state for about four billion six hundred million years and is thousands of times larger than the Earth.     By studying other stars, astronomers can predict what the...
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Read the following passage on transport, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50.

    The Sun today is a yellow dwarf star. It is fueled by thermonuclear reactions near its center that convert hydrogen to helium. The Sun has existed in its present state for about four billion six hundred million years and is thousands of times larger than the Earth.

    By studying other stars, astronomers can predict what the rest of the Sun’s life will be like. About five billion years from now, the core of the Sun will shrink and become hotter. The surface temperature will fall. The higher temperature of the center will increase the rate of thermonuclear reactions. The outer regions of the Sun will expand approximately 35 million miles, about the distance to Mercury, which is the closest planet to the Sun. The Sun will then be a red giant star. Temperatures on the Earth will become too high for life to exist.

    Once the Sun has used up its thermonuclear energy as a red giant, it will begin to shrink. After it shrinks to the size of the Earth, it will become a white dwarf star. The Sun may throw off huge amounts of gases in violent eruptions called nova explosions as it changes from a red giant to a white dwarf.

          After billions of years as a white dwarf, the Sun will have used up all its fuel and will have lost its heat. Such a star is called a black dwarf. After the Sun has become a black dwarf, the Earth will be dark and cold. If any atmosphere remains there, it will have frozen over the Earth’s surface.

It can be inferred from the passage that the Sun ___.

A. has been in existence for 10 billion years

B. is approximately halfway through its life as a yellow dwarf

C. will continue to be a yellow dwarf for another 10 billion years

D. is rapidly changing in size and brightness

1
2 tháng 3 2018

Đáp án B

“The Sun today is a yellow dwarf star…The Sun has existed in its present state for about four billion six hundred million years “

Mặt trời đã tồn tại được hơn 4 tỉ năm với đặc tính là một ngôi sao lùn màu vàng

Đoạn tiếp sau có “About five billion years from now, the core of the Sun will shrink and become hotter” /Khoảng 5 tỉ năm sau, lõi mặt trời sẽ nhỏ lại và trở nên nóng hơn.

Như vậy dựa vào các thông tin trên, ta thấy mặt trờ đã trải qua gần 1 nửa thoài gian tồn tại là ngôi sao lùn màu vàng