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

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 36.

What is commonly called pepper in reality comes from two very different families of plants. Black and white pepper both come from the fruit of the Piper nigrum, a vine with fruits called peppercorns. The peppercorns turn from green to red as they ripen and finally blacken as they dry out. The dried-out peppercorns are ground to obtain black pepper. White pepper, which has a more subtle flavour than black pepper, comes from the same peppercorns as black pepper. To obtain white pepper, the outer hull of the peppercorn, the pericarp, is removed before the peppercorn is ground. Red and green pepper, on the other hand, come from a completely different family from black and white pepper. Red and green peppers are from the genus Capsicum. Plants of this type generally have tiny white flowers and fruit which can be any of a number of colours, shapes and sizes. These peppers range in flavour from very mild and sweet to the most incredibly burning taste imaginable. Bell peppers are the most mild, while habanros are the most burning.

Christopher Columbus is responsible for the present-day confusion over what pepper is. The Piper nigrum variety of pepper was highly valued for centuries, and high demand for pepper by Europeans was a major cause of the fifteen-century push to locate ocean routes to the spice-growing regions of Asia. When Columbus arrived in the New World in 1492, he was particularly interested in finding black pepper because of the high price it would command in Europe. Columbus came across plants from the Capsicum family in use among people of the New World, and he incorrectly identified them as relatives of black pepper. Columbus introduced the spicy Capsicum chili peppers to Europeans on his return from the 1492 voyage, and traders later spread them to Asia and Africa. These Capsicum peppers have continued to be called peppers in spite of the fact that they are not related to the black and white pepper of the Piper nigrum family

What part of the Piper nigrum is the pericarp?

A. The seed inside the fruit

B. The outer covering of the vine

C. The pulp inside the vine

D. The outer covering of the fruit

1

DH

Dương Hoàn Anh

19 tháng 12 2019

Chọn D

Kiến thức: Đọc hiểu

Giải thích:

Phần nào của hồ tiêu là vỏ hột?

A. Hạt bên trong quả

B. Vỏ ngoài của cây nho

C. Phần thịt bên trong cây nho

D. Vỏ ngoài của quả

Thông tin: To obtain white pepper, the outer hull of the peppercorn, the pericarp, is removed before the peppercorn is ground.

Tạm dịch: Để có được hạt tiêu trắng, vỏ ngoài của hạt tiêu, vỏ quả, được lấy ra trước khi hạt tiêu được nghiền

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 36.What is commonly called pepper in reality comes from two very different families of plants. Black and white pepper both come from the fruit of the Piper nigrum, a vine with fruits called peppercorns. The peppercorns turn from green to red as they ripen and finally blacken as they dry out. The dried-out peppercorns are ground to obtain black...

LQ

Lê Quỳnh Anh

26 tháng 5 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 from 29 to 36.

What is commonly called pepper in reality comes from two very different families of plants. Black and white pepper both come from the fruit of the Piper nigrum, a vine with fruits called peppercorns. The peppercorns turn from green to red as they ripen and finally blacken as they dry out. The dried-out peppercorns are ground to obtain black pepper. White pepper, which has a more subtle flavour than black pepper, comes from the same peppercorns as black pepper. To obtain white pepper, the outer hull of the peppercorn, the pericarp, is removed before the peppercorn is ground. Red and green pepper, on the other hand, come from a completely different family from black and white pepper. Red and green peppers are from the genus Capsicum. Plants of this type generally have tiny white flowers and fruit which can be any of a number of colours, shapes and sizes. These peppers range in flavour from very mild and sweet to the most incredibly burning taste imaginable. Bell peppers are the most mild, while habanros are the most burning.

Christopher Columbus is responsible for the present-day confusion over what pepper is. The Piper nigrum variety of pepper was highly valued for centuries, and high demand for pepper by Europeans was a major cause of the fifteen-century push to locate ocean routes to the spice-growing regions of Asia. When Columbus arrived in the New World in 1492, he was particularly interested in finding black pepper because of the high price it would command in Europe. Columbus came across plants from the Capsicum family in use among people of the New World, and he incorrectly identified them as relatives of black pepper. Columbus introduced the spicy Capsicum chili peppers to Europeans on his return from the 1492 voyage, and traders later spread them to Asia and Africa. These Capsicum peppers have continued to be called peppers in spite of the fact that they are not related to the black and white pepper of the Piper nigrum family

According to the passage, both black and white peppers ______.

A. have the same flavour

B. come from different plants

C. change colours after they are ground

D. are ground from dried-out peppercorns

1

DH

Dương Hoàn Anh

26 tháng 5 2018

Chọn D

Kiến thức: Đọc hiểu

Giải thích:

Theo đoạn văn, cả tiêu đen và trắng _________.

A. có cùng hương vị

B. đến từ các loại thực vật khác nhau

C. thay đổi màu sắc sau khi chúng được nghiền

D. được nghiền từ hạt tiêu khô

Thông tin: White pepper, which has a more subtle flavour than black pepper, comes from the same peppercorns as black pepper.

Tạm dịch: Hạt tiêu trắng, có hương vị tinh tế hơn hạt tiêu đen, có chung nguồn gốc từ một loại hạt tiêu khô là hạt tiêu đen

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 36.What is commonly called pepper in reality comes from two very different families of plants. Black and white pepper both come from the fruit of the Piper nigrum, a vine with fruits called peppercorns. The peppercorns turn from green to red as they ripen and finally blacken as they dry out. The dried-out peppercorns are ground to obtain black...

LQ

Lê Quỳnh Anh

25 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 from 29 to 36.

What is commonly called pepper in reality comes from two very different families of plants. Black and white pepper both come from the fruit of the Piper nigrum, a vine with fruits called peppercorns. The peppercorns turn from green to red as they ripen and finally blacken as they dry out. The dried-out peppercorns are ground to obtain black pepper. White pepper, which has a more subtle flavour than black pepper, comes from the same peppercorns as black pepper. To obtain white pepper, the outer hull of the peppercorn, the pericarp, is removed before the peppercorn is ground. Red and green pepper, on the other hand, come from a completely different family from black and white pepper. Red and green peppers are from the genus Capsicum. Plants of this type generally have tiny white flowers and fruit which can be any of a number of colours, shapes and sizes. These peppers range in flavour from very mild and sweet to the most incredibly burning taste imaginable. Bell peppers are the most mild, while habanros are the most burning.

Christopher Columbus is responsible for the present-day confusion over what pepper is. The Piper nigrum variety of pepper was highly valued for centuries, and high demand for pepper by Europeans was a major cause of the fifteen-century push to locate ocean routes to the spice-growing regions of Asia. When Columbus arrived in the New World in 1492, he was particularly interested in finding black pepper because of the high price it would command in Europe. Columbus came across plants from the Capsicum family in use among people of the New World, and he incorrectly identified them as relatives of black pepper. Columbus introduced the spicy Capsicum chili peppers to Europeans on his return from the 1492 voyage, and traders later spread them to Asia and Africa. These Capsicum peppers have continued to be called peppers in spite of the fact that they are not related to the black and white pepper of the Piper nigrum family

It can be inferred from the passage that chili peppers originally came from ______.

A. Europe

B. Asia

C. America

D. Africa

1

DH

Dương Hoàn Anh

25 tháng 3 2018

Chọn C

Kiến thức: Đọc hiểu

Giải thích:

Có thể suy ra từ đoạn văn rằng ớt ban đầu xuất phát từ ________.

A. Châu Âu

B. Châu Á

C. Châu Mỹ

D. Châu Phi

Thông tin: Columbus introduced the spicy Capsicum chili peppers to Europeans on his return from the 1492 voyage, and traders later spread them to Asia and Africa.

Tạm dịch: Columbus đã giới thiệu ớt chuông cay cho người châu Âu khi trở về từ chuyến đi năm 1492, và các thương nhân sau đó đã truyền bá chúng sang châu Á và châu Phi.

Dịch bài đọc:

Những gì thường được gọi là ‘pepper’ trong thực tế đến từ hai họ thực vật rất khác nhau. Hạt tiêu đen và trắng đều đến từ quả của hồ tiêu, một loại cây leo có trái gọi là hạt tiêu. Những hạt tiêu chuyển từ màu xanh sang màu đỏ khi chúng chín và cuối cùng là đen khi chúng khô. Những hạt tiêu khô được nghiền để lấy hạt tiêu đen. Hạt tiêu trắng, có hương vị tinh tế hơn hạt tiêu đen, có chung nguồn gốc từ một loại hạt tiêu khô là hạt tiêu đen. Để có được hạt tiêu trắng, vỏ ngoài của hạt tiêu, vỏ quả, được lấy ra trước khi hạt tiêu được nghiền. Mặt khác, ớt đỏ và xanh đến từ một họ hoàn toàn khác với hạt tiêu đen và trắng. Ớt đỏ và xanh là từ loài Capsicum. Loại cây này có bông hoa nhỏ màu trắng và quả có thể có nhiều màu, hình dạng và kích cỡ.

Những quả ớt này có hương vị từ rất nhẹ và ngọt đến hương vị cháy bỏng nhất có thể tưởng tượng. Ớt chuông là loại ít cay nhất, trong khi ớt habanero là loại cay nhất.

Christopher Columbus chịu trách nhiệm cho sự mơ hồ ngày nay về vấn đề ‘hạt tiêu’ là gì. Giống hồ tiêu được đánh giá cao trong nhiều thế kỷ và nhu cầu tiêu thụ cao của người châu Âu là nguyên nhân chính của việc thúc đẩy trong mười lăm thế kỷ để định vị các tuyến đường biển đến các vùng trồng gia vị ở châu Á. Khi Columbus đến ‘Thế Giới Mới’ vào năm 1492, ông đặc biệt thích việc tìm kiếm hạt tiêu đen vì nó có giá thành cao ở châu Âu. Columbus tình cờ biết loại thực vật thuộc họ cây ớt chuông được sử dụng giữa những người của Thế Giới Mới, và ông ấy đã nhận định sai lầm chúng có họ hàng với hạt tiêu đen. Columbus đã giới thiệu ớt chuông cay cho người châu Âu khi trở về từ chuyến đi năm 1492, và các thương nhân sau đó đã truyền bá chúng sang châu Á và châu Phi. Những quả ớt chuông này đã tiếp tục được gọi là ‘pepper’ mặc dù thực tế là chúng không liên quan đến hạt tiêu đen và trắng của họ hồ tiêu

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 36. What is commonly called pepper in reality comes from two very different families of plants. Black and white pepper both come from the fruit of the Piper nigrum, a vine with fruits called peppercorns. The peppercorns turn from green to red as they ripen and finally blacken as they dry out. The dried-out peppercorns are ground to obtain black...

LQ

Lê Quỳnh Anh

4 tháng 9 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 from 29 to 36.

What is commonly called pepper in reality comes from two very different families of plants. Black and white pepper both come from the fruit of the Piper nigrum, a vine with fruits called peppercorns. The peppercorns turn from green to red as they ripen and finally blacken as they dry out. The dried-out peppercorns are ground to obtain black pepper. White pepper, which has a more subtle flavour than black pepper, comes from the same peppercorns as black pepper. To obtain white pepper, the outer hull of the peppercorn, the pericarp, is removed before the peppercorn is ground. Red and green pepper, on the other hand, come from a completely different family from black and white pepper. Red and green peppers are from the genus Capsicum. Plants of this type generally have tiny white flowers and fruit which can be any of a number of colours, shapes and sizes. These peppers range in flavour from very mild and sweet to the most incredibly burning taste imaginable. Bell peppers are the most mild, while habanros are the most burning.

Christopher Columbus is responsible for the present-day confusion over what pepper is. The Piper nigrum variety of pepper was highly valued for centuries, and high demand for pepper by Europeans was a major cause of the fifteen-century push to locate ocean routes to the spice-growing regions of Asia. When Columbus arrived in the New World in 1492, he was particularly interested in finding black pepper because of the high price it would command in Europe. Columbus came across plants from the Capsicum family in use among people of the New World, and he incorrectly identified them as relatives of black pepper. Columbus introduced the spicy Capsicum chili peppers to Europeans on his return from the 1492 voyage, and traders later spread them to Asia and Africa. These Capsicum peppers have continued to be called peppers in spite of the fact that they are not related to the black and white pepper of the Piper nigrum family

The purpose of this passage is to ______.

A. provide the scientific classification of various types of peppers

B. classify the variety of sizes, shapes and colours of peppers

C. demonstrate that it was Columbus who brought peppers to Europe

D. explain why there is confusion today over peppers

1

DH

Dương Hoàn Anh

4 tháng 9 2019

Chọn D

Kiến thức: Đọc hiểu

Giải thích:

Mục đích của bài đọc này là _________.

A. cung cấp sự phân chia theo khoa học của đa dạng các loại „pepper’

B. phân loại sự đa dạng về kích cỡ, hình dạng và màu sắc của „pepper’

C. chứng minh rằng chính Columbus đã mang „pepper’đến châu Âu

D. giải thích tại sao ngày nay có sự nhầm lẫn về „pepper’

Đoạn 1: Sự phân chia các loại hạt tiêu, các loại ớt cùng được gọi là „pepper’ theo họ một cách khoa học

Đoạn 2: Columbus phát hiện ra một loài cây mới và sự xuất hiện của chúng ở các châu lục

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 36.What is commonly called pepper in reality comes from two very different families of plants. Black and white pepper both come from the fruit of the Piper nigrum, a vine with fruits called peppercorns. The peppercorns turn from green to red as they ripen and finally blacken as they dry out. The dried-out peppercorns are ground to obtain black...

LQ

Lê Quỳnh Anh

4 tháng 2 2017

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 36.

What is commonly called pepper in reality comes from two very different families of plants. Black and white pepper both come from the fruit of the Piper nigrum, a vine with fruits called peppercorns. The peppercorns turn from green to red as they ripen and finally blacken as they dry out. The dried-out peppercorns are ground to obtain black pepper. White pepper, which has a more subtle flavour than black pepper, comes from the same peppercorns as black pepper. To obtain white pepper, the outer hull of the peppercorn, the pericarp, is removed before the peppercorn is ground. Red and green pepper, on the other hand, come from a completely different family from black and white pepper. Red and green peppers are from the genus Capsicum. Plants of this type generally have tiny white flowers and fruit which can be any of a number of colours, shapes and sizes. These peppers range in flavour from very mild and sweet to the most incredibly burning taste imaginable. Bell peppers are the most mild, while habanros are the most burning.

Christopher Columbus is responsible for the present-day confusion over what pepper is. The Piper nigrum variety of pepper was highly valued for centuries, and high demand for pepper by Europeans was a major cause of the fifteen-century push to locate ocean routes to the spice-growing regions of Asia. When Columbus arrived in the New World in 1492, he was particularly interested in finding black pepper because of the high price it would command in Europe. Columbus came across plants from the Capsicum family in use among people of the New World, and he incorrectly identified them as relatives of black pepper. Columbus introduced the spicy Capsicum chili peppers to Europeans on his return from the 1492 voyage, and traders later spread them to Asia and Africa. These Capsicum peppers have continued to be called peppers in spite of the fact that they are not related to the black and white pepper of the Piper nigrum family

What usually does NOT vary in a Capsicum plant?

A. The size of the fruit

B. The colour of the flower

C. The colour of the fruit

D. The shape of the fruit

1

DH

Dương Hoàn Anh

4 tháng 2 2017

Chọn B

Kiến thức: Đọc hiểu

Giải thích:

Điều gì thường KHÔNG thay đổi trong cây ớt chuông?

A. Kích thước của quả

B. Màu của hoa

C. Màu sắc của quả

D. Hình dạng của quả

Thông tin: Red and green peppers are from the genus Capsicum. Plants of this type generally have tiny white flowers and fruit which can be any of a number of colours, shapes and sizes.

Tạm dịch: Ớt đỏ và xanh có nguồn gốc là cây ớt chuông. Loại cây này có bông hoa nhỏ màu trắng và quả mà nó có thể có nhiều màu, hình dạng và kích cỡ

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 36.What is commonly called pepper in reality comes from two very different families of plants. Black and white pepper both come from the fruit of the Piper nigrum, a vine with fruits called peppercorns. The peppercorns turn from green to red as they ripen and finally blacken as they dry out. The dried-out peppercorns are ground to obtain black...

LQ

Lê Quỳnh Anh

12 tháng 10 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 from 29 to 36.

What is commonly called pepper in reality comes from two very different families of plants. Black and white pepper both come from the fruit of the Piper nigrum, a vine with fruits called peppercorns. The peppercorns turn from green to red as they ripen and finally blacken as they dry out. The dried-out peppercorns are ground to obtain black pepper. White pepper, which has a more subtle flavour than black pepper, comes from the same peppercorns as black pepper. To obtain white pepper, the outer hull of the peppercorn, the pericarp, is removed before the peppercorn is ground. Red and green pepper, on the other hand, come from a completely different family from black and white pepper. Red and green peppers are from the genus Capsicum. Plants of this type generally have tiny white flowers and fruit which can be any of a number of colours, shapes and sizes. These peppers range in flavour from very mild and sweet to the most incredibly burning taste imaginable. Bell peppers are the most mild, while habanros are the most burning.

Christopher Columbus is responsible for the present-day confusion over what pepper is. The Piper nigrum variety of pepper was highly valued for centuries, and high demand for pepper by Europeans was a major cause of the fifteen-century push to locate ocean routes to the spice-growing regions of Asia. When Columbus arrived in the New World in 1492, he was particularly interested in finding black pepper because of the high price it would command in Europe. Columbus came across plants from the Capsicum family in use among people of the New World, and he incorrectly identified them as relatives of black pepper. Columbus introduced the spicy Capsicum chili peppers to Europeans on his return from the 1492 voyage, and traders later spread them to Asia and Africa. These Capsicum peppers have continued to be called peppers in spite of the fact that they are not related to the black and white pepper of the Piper nigrum family

The word turn could best be replaced by ______.

A. revert

B. veer

C. exchange

D. change

1

DH

Dương Hoàn Anh

12 tháng 10 2019

Chọn D

Kiến thức: Từ đồng nghĩa

Giải thích:

Từ “turn” (chuyển đổi) có thể được thay thế bằng từ nào ________.

A. revert (v): trở lại tình trạng cũ

B. veer (v): sự đổi hướng

C. exchange (v): trao đổi

D. change (v): thay đổi

Thông tin: The peppercorns turn from green to red as they ripen and finally blacken as they dry out.

Tạm dịch: Những hạt tiêu chuyển từ màu xanh sang màu đỏ khi chúng chín và cuối cùng đen khi chúng khô

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 36. What is commonly called pepper in reality comes from two very different families of plants. Black and white pepper both come from the fruit of the Piper nigrum, a vine with fruits called peppercorns. The peppercorns turn from green to red as they ripen and finally blacken as they dry out. The dried-out peppercorns are ground to obtain black...

LQ

Lê Quỳnh Anh

4 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 from 29 to 36.

What is commonly called pepper in reality comes from two very different families of plants. Black and white pepper both come from the fruit of the Piper nigrum, a vine with fruits called peppercorns. The peppercorns turn from green to red as they ripen and finally blacken as they dry out. The dried-out peppercorns are ground to obtain black pepper. White pepper, which has a more subtle flavour than black pepper, comes from the same peppercorns as black pepper. To obtain white pepper, the outer hull of the peppercorn, the pericarp, is removed before the peppercorn is ground. Red and green pepper, on the other hand, come from a completely different family from black and white pepper. Red and green peppers are from the genus Capsicum. Plants of this type generally have tiny white flowers and fruit which can be any of a number of colours, shapes and sizes. These peppers range in flavour from very mild and sweet to the most incredibly burning taste imaginable. Bell peppers are the most mild, while habanros are the most burning.

Christopher Columbus is responsible for the present-day confusion over what pepper is. The Piper nigrum variety of pepper was highly valued for centuries, and high demand for pepper by Europeans was a major cause of the fifteen-century push to locate ocean routes to the spice-growing regions of Asia. When Columbus arrived in the New World in 1492, he was particularly interested in finding black pepper because of the high price it would command in Europe. Columbus came across plants from the Capsicum family in use among people of the New World, and he incorrectly identified them as relatives of black pepper. Columbus introduced the spicy Capsicum chili peppers to Europeans on his return from the 1492 voyage, and traders later spread them to Asia and Africa. These Capsicum peppers have continued to be called peppers in spite of the fact that they are not related to the black and white pepper of the Piper nigrum family

The word push could best be replaced by ______.

A. hit

B. drive

C. shove

D. strength

1

DH

Dương Hoàn Anh

4 tháng 12 2018

Chọn B

Kiến thức: Từ đồng nghĩa

Giải thích:

Từ “push” (sự thúc đẩy) có thể được thay thế bằng từ _______.

A. hit (n): cú đánh

B. drive (n): sự tiến triển

C. shove (v): sự xô đẩy

D. strength (n): sức mạnh

Thông tin: The Piper nigrum variety of pepper was highly valued for centuries, and high demand for pepper by Europeans was a major cause of the fifteen-century push to locate ocean routes to the spice-growing regions of Asia.

Tạm dịch: Giống hồ tiêu được đánh giá cao trong nhiều thế kỷ và nhu cầu tiêu thụ cao của người châu Âu là nguyên nhân chính của việc thúc đẩy trong mười lăm thế kỷ để định vị các tuyến đường biển đến các vùng trồng gia vị ở châu Á

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...

LQ

Lê Quỳnh Anh

2 tháng 3 2018

1

DH

Dương Hoàn Anh

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

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...

LQ

Lê Quỳnh Anh

26 tháng 12 2019

1

DH

Dương Hoàn Anh

26 tháng 12 2019

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