Read the passage and mark the letter A, B, C or D to answer the following questions.Most sources of illumination generat...

LQ

Lê Quỳnh Anh

20 tháng 10 2018

Read the passage and mark the letter A, B, C or D to answer the following questions.Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture...

Đọc tiếp

Read the passage and mark the letter A, B, C or D to answer the following questions.

Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture high-speed movement on film as well as to correct deficiencies of the normal surrounding lighting. Photoﬂash is now generated electronically, but the earliest form, ﬁrst used in 1864, was a paper bag containing

magnesium wire and some oxygen-rich substance, such as potassium chlorate. When the bag was ignited, the metal burned with an intense ﬂash. A contemporary observer reported that "this quite unsafe device seems to have done nothing worse that engulf the room in dense smoke and lead to pictures of dubious quality and odd poses.”

The evolution of the photoﬂash was slow, ﬂashbulbs, containing fine wire made of a metal, such as magnesium or aluminum, capable of being ignited in an atmosphere of pure oxygen at low pressure, were introduced only in the 1920's. In the earliest type, the metal was separated from the oxygen by a thin glass bulb. The ﬂash was ﬁred by piercing the bulb and allowing the oxygen to come into contact with the metal, which ignited spontaneously. Later bulbs were fired by an electric battery, which heated the wire by passing a small current through it. Other combinations, such as the pairing of oxygen diﬂuoride with zirconium, have also been used. In each case enough energy is given out to heat the oxidizable metal momentarily to a white hot emission of visible light. The smoke particles are so small that they cool rapidly; but since they are white, they contribute to the brilliance by reﬂecting the light from their still glowing neighbors. A slightly bigger form of the metal will burn for a longer time.

According to the passage, an advantage of using a photoﬂash is that it _____.

A. can produce repeated bursts of light

B. intensities colors in photographs

C. is short enough not to bother human eyes

D. supplements existing lighting

#Mẫu giáo

1

DH

Dương Hoàn Anh

20 tháng 10 2018

Đáp án D

Theo đoạn văn, một lợi ích của việc sử dụng đèn ﬂash là nó _______.

A. có thể tạo ra những chùm sáng lặp đi lặp lại

B. tăng cường màu sắc trong các bức ảnh

C. đủ nhanh để không làm nheo mắt người được chụp ảnh

D. bổ sung ánh sáng hiện có

Dựa vào thông tin trong đoạn 1:

Tạm dịch: “A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture high-speed movement on film as well as to correct deficiencies of the normal surrounding lighting." (Tuy nhiên, chất tráng phim dùng trong nhiếp ảnh - là một lớp phủ nhạy với ánh sáng trên phim ảnh, gidy hoặc thủy tinh - sẽ ghi lại những chùm ánh sáng ngắn hơn nhiều. Do đó, đèn flash chụp ảnh có thể được sử dụng để ghi lại chuyển động tốc độ cao trên phim cũng như điều chỉnh sự thiếu hụt của ánh sáng xung quanh)

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Lê Quỳnh Anh

1 tháng 8 2019

Read the passage and mark the letter A, B, C or D to answer the following questions.Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture...

Đọc tiếp

Read the passage and mark the letter A, B, C or D to answer the following questions.

Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture high-speed movement on film as well as to correct deficiencies of the normal surrounding lighting. Photoﬂash is now generated electronically, but the earliest form, ﬁrst used in 1864, was a paper bag containing

magnesium wire and some oxygen-rich substance, such as potassium chlorate. When the bag was ignited, the metal burned with an intense ﬂash. A contemporary observer reported that "this quite unsafe device seems to have done nothing worse that engulf the room in dense smoke and lead to pictures of dubious quality and odd poses.”

The evolution of the photoﬂash was slow, ﬂashbulbs, containing fine wire made of a metal, such as magnesium or aluminum, capable of being ignited in an atmosphere of pure oxygen at low pressure, were introduced only in the 1920's. In the earliest type, the metal was separated from the oxygen by a thin glass bulb. The ﬂash was ﬁred by piercing the bulb and allowing the oxygen to come into contact with the metal, which ignited spontaneously. Later bulbs were fired by an electric battery, which heated the wire by passing a small current through it. Other combinations, such as the pairing of oxygen diﬂuoride with zirconium, have also been used. In each case enough energy is given out to heat the oxidizable metal momentarily to a white hot emission of visible light. The smoke particles are so small that they cool rapidly; but since they are white, they contribute to the brilliance by reﬂecting the light from their still glowing neighbors. A slightly bigger form of the metal will burn for a longer time.

The word "ignited" in paragraph 1 is closest in meaning to ______.

A. set on fire

B. cut into

C. opened

D. shaken

#Mẫu giáo

1

DH

Dương Hoàn Anh

1 tháng 8 2019

Đáp án A

Từ "ignited” trong đoạn 1 gần nghĩa nhất với __________.

A. đốt cháy B. cắt C. mở D. rung

Căn cứ vào thông tin đoạn 1:

Tạm dịch: “When the bag was ignited, the metal burned with an intense ﬂash." (Khi chiếc túi được đánh lửa, kim loại bị đốt cháy với ánh sáng dữ dội.)

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Lê Quỳnh Anh

7 tháng 1 2018

Read the passage and mark the letter A, B, C or D to answer the following questions.Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture...

Đọc tiếp

Read the passage and mark the letter A, B, C or D to answer the following questions.

Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture high-speed movement on film as well as to correct deficiencies of the normal surrounding lighting. Photoﬂash is now generated electronically, but the earliest form, ﬁrst used in 1864, was a paper bag containing

magnesium wire and some oxygen-rich substance, such as potassium chlorate. When the bag was ignited, the metal burned with an intense ﬂash. A contemporary observer reported that "this quite unsafe device seems to have done nothing worse that engulf the room in dense smoke and lead to pictures of dubious quality and odd poses.”

The evolution of the photoﬂash was slow, ﬂashbulbs, containing fine wire made of a metal, such as magnesium or aluminum, capable of being ignited in an atmosphere of pure oxygen at low pressure, were introduced only in the 1920's. In the earliest type, the metal was separated from the oxygen by a thin glass bulb. The ﬂash was ﬁred by piercing the bulb and allowing the oxygen to come into contact with the metal, which ignited spontaneously. Later bulbs were fired by an electric battery, which heated the wire by passing a small current through it. Other combinations, such as the pairing of oxygen diﬂuoride with zirconium, have also been used. In each case enough energy is given out to heat the oxidizable metal momentarily to a white hot emission of visible light. The smoke particles are so small that they cool rapidly; but since they are white, they contribute to the brilliance by reﬂecting the light from their still glowing neighbors. A slightly bigger form of the metal will burn for a longer time.

What is the best title for the passage?

A. The history of the photoﬂash

B. Theories about how the eye reacts to light

C. The technology of modern photography

D. The dangers of using the early photoﬂash

#Mẫu giáo

1

DH

Dương Hoàn Anh

7 tháng 1 2018

Đáp án A

Chủ đề về INVENTIONS

Tiêu đề chính của đoạn văn là gì?

A. Lịch sử của đèn nháy (đèn ﬂash)

B. Các học thuyết về cách mà mắt phản ứng lại ánh sáng

C. Công nghệ chụp ảnh hiện đại

D. Những nguy hiểm của việc sử dụng đèn ﬂash thủa ban đầu

Căn cứ vào các thông tin ở cả đoạn 1 và 2:

- “Photoﬂash is now generated electronically, but the earliest form, first used in 1864, was a paper bag containing magnesium wire and some oxygen-rich substance, such as potassium chlorate." (Đèn flash ngày nay được tạo ra hàng công nghệ tự động hóa, nhưng thủa sơ khai, khi lần đầu tiên được sử dụng vào năm 1864, nó chỉ là một túi giấy có chứa dây dẫn magiê và một số chất giàu oxy, như kali clorat.)

- “The evolution of the photoﬂash was slow, ﬂashbulbs, containing fine wire made of a metal, such as magnesium or aluminum, capable of being ignited in an atmosphere of pure oxygen at low pressure, were introduced only in the 1920's." (Sự phát triển của đèn flash diễn ra chậm, các bóng đèn nháy, chứa dây dẫn làm bằng kim loại, như magiê hoặc nhóm, có khả năng bị đốt cháy trong môi trường chứa oxy tinh khiết ở áp suất thấp, chỉ được phát minh vào những năm 1920.)

Như vậy có thể thấy xuyên suốt bài đọc là lịch sử ra đời và phát triển của đèn ﬂash => Do do, đáp án là A

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Lê Quỳnh Anh

24 tháng 1 2018

Read the passage and mark the letter A, B, C or D to answer the following questions.Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture...

Đọc tiếp

Read the passage and mark the letter A, B, C or D to answer the following questions.

Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture high-speed movement on film as well as to correct deficiencies of the normal surrounding lighting. Photoﬂash is now generated electronically, but the earliest form, ﬁrst used in 1864, was a paper bag containing

magnesium wire and some oxygen-rich substance, such as potassium chlorate. When the bag was ignited, the metal burned with an intense ﬂash. A contemporary observer reported that "this quite unsafe device seems to have done nothing worse that engulf the room in dense smoke and lead to pictures of dubious quality and odd poses.”

The evolution of the photoﬂash was slow, ﬂashbulbs, containing fine wire made of a metal, such as magnesium or aluminum, capable of being ignited in an atmosphere of pure oxygen at low pressure, were introduced only in the 1920's. In the earliest type, the metal was separated from the oxygen by a thin glass bulb. The ﬂash was ﬁred by piercing the bulb and allowing the oxygen to come into contact with the metal, which ignited spontaneously. Later bulbs were fired by an electric battery, which heated the wire by passing a small current through it. Other combinations, such as the pairing of oxygen diﬂuoride with zirconium, have also been used. In each case enough energy is given out to heat the oxidizable metal momentarily to a white hot emission of visible light. The smoke particles are so small that they cool rapidly; but since they are white, they contribute to the brilliance by reﬂecting the light from their still glowing neighbors. A slightly bigger form of the metal will burn for a longer time.

The word "momentarily" in paragraph 2 is closet in meaning to ______.

A. effortlessly

B. brieﬂy

C. electronically

D. gradually

#Mẫu giáo

1

DH

Dương Hoàn Anh

24 tháng 1 2018

Đáp án B

Từ “momentarily” trong đoạn 2 gần nghĩa với từ ___________.

A. effortlessly /'efətlisli/ (adv): một cách dễ dàng

B. brieﬂy /'bri:ﬂi/ (adv): một cách ngắn gọn

C. electronically /ilek'trɔnikli/ (adv): bằng điện tử

D. gradually /'grædjuəli/ (adv): dần dần, từ từ

Căn cứ vào ngữ cảnh đoạn 2:

“In each case, enough energy is given out to heat the oxidizable metal momentarily to a white hot emission of Visible light.” (Trong mỗi trường hợp, một năng lượng vừa đủ được cung cấp để đốt cháy kim loại có thể oxy hóa trong giây lát để phát ra ánh sáng nóng trắng mà mắt thường có thể thấy được.)

=> Do đó, đáp án là B

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Lê Quỳnh Anh

21 tháng 8 2017

Read the passage and mark the letter A, B, C or D to answer the following questions.Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture...

Đọc tiếp

Read the passage and mark the letter A, B, C or D to answer the following questions.

Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture high-speed movement on film as well as to correct deficiencies of the normal surrounding lighting. Photoﬂash is now generated electronically, but the earliest form, ﬁrst used in 1864, was a paper bag containing

magnesium wire and some oxygen-rich substance, such as potassium chlorate. When the bag was ignited, the metal burned with an intense ﬂash. A contemporary observer reported that "this quite unsafe device seems to have done nothing worse that engulf the room in dense smoke and lead to pictures of dubious quality and odd poses.”

The evolution of the photoﬂash was slow, ﬂashbulbs, containing fine wire made of a metal, such as magnesium or aluminum, capable of being ignited in an atmosphere of pure oxygen at low pressure, were introduced only in the 1920's. In the earliest type, the metal was separated from the oxygen by a thin glass bulb. The ﬂash was ﬁred by piercing the bulb and allowing the oxygen to come into contact with the metal, which ignited spontaneously. Later bulbs were fired by an electric battery, which heated the wire by passing a small current through it. Other combinations, such as the pairing of oxygen diﬂuoride with zirconium, have also been used. In each case enough energy is given out to heat the oxidizable metal momentarily to a white hot emission of visible light. The smoke particles are so small that they cool rapidly; but since they are white, they contribute to the brilliance by reﬂecting the light from their still glowing neighbors. A slightly bigger form of the metal will burn for a longer time.

Which of the following most accurately reﬂects the main idea of the last paragraph?

A. The time when photoﬂash was first used.

B. How metal burns in an atmosphere of pure oxygen.

C. How early photoﬂash worked.

D. The role of glass in ﬂashbulb.

#Mẫu giáo

1

DH

Dương Hoàn Anh

21 tháng 8 2017

Đáp án C

Câu nào dưới đây phản ảnh chính xác nhất ý chính của đoạn cuối?

A. Đèn flash lần đầu tiên được sử dụng là khi nào.

B. Làm sao kim loại cháy được trong môi trường oxy tinh khiết.

C. Cách thức hoạt động của đèn flash đời đầu.

D. Vai trò của thủy tinh trong bóng đèn ﬂash.

Căn cứ vào thông tin trong đoạn cuối: đã được trích dẫn trong các câu 38, 39, và 40, ta dễ dàng nhận thấy đoạn này nói về cách tạo ra tia ﬂash ở loại đèn ﬂash đời đầu tiên.

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Lê Quỳnh Anh

23 tháng 8 2019

Read the passage and mark the letter A, B, C or D to answer the following questions.Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture...

Đọc tiếp

Read the passage and mark the letter A, B, C or D to answer the following questions.

Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture high-speed movement on film as well as to correct deficiencies of the normal surrounding lighting. Photoﬂash is now generated electronically, but the earliest form, ﬁrst used in 1864, was a paper bag containing

magnesium wire and some oxygen-rich substance, such as potassium chlorate. When the bag was ignited, the metal burned with an intense ﬂash. A contemporary observer reported that "this quite unsafe device seems to have done nothing worse that engulf the room in dense smoke and lead to pictures of dubious quality and odd poses.”

The evolution of the photoﬂash was slow, ﬂashbulbs, containing fine wire made of a metal, such as magnesium or aluminum, capable of being ignited in an atmosphere of pure oxygen at low pressure, were introduced only in the 1920's. In the earliest type, the metal was separated from the oxygen by a thin glass bulb. The ﬂash was ﬁred by piercing the bulb and allowing the oxygen to come into contact with the metal, which ignited spontaneously. Later bulbs were fired by an electric battery, which heated the wire by passing a small current through it. Other combinations, such as the pairing of oxygen diﬂuoride with zirconium, have also been used. In each case enough energy is given out to heat the oxidizable metal momentarily to a white hot emission of visible light. The smoke particles are so small that they cool rapidly; but since they are white, they contribute to the brilliance by reﬂecting the light from their still glowing neighbors. A slightly bigger form of the metal will burn for a longer time.

According to the passage, what helps a ﬂashbulb burn longer?

A. thicker wire

B. more oxygen

C. thinner glass

D. continuous electricity

#Mẫu giáo

1

DH

Dương Hoàn Anh

23 tháng 8 2019

Đáp án A

Theo bài văn, điều gì giúp cho bóng đèn flash có thể cháy lâu hơn?

A. dây dẫn dày hơn B. nhiều Oxy hơn

C. kính mỏng hơn D. điện thường xuyên

Căn cứ vào câu cuối của bài:

“A slightly bigger form of the metal will burn for a longer time.” (Một mẫu kim loại lớn hơn chút xíu sẽ cháy lâu hơn).

Trong suốt bài đọc, kim loại chính là dây dẫn trong bóng đèn flash.

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Lê Quỳnh Anh

23 tháng 11 2019

Read the passage and mark the letter A, B, C or D to answer the following questions.Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture...

Đọc tiếp

Read the passage and mark the letter A, B, C or D to answer the following questions.

Most sources of illumination generate light over an appreciable period, and indeed if an object is lit for a very brief time (1ess that 1/25 second), the human eye will not react in time to see the object. A photographic emulsion - that is, a light-sensitive coating on photographic film, paper, or glass - will, however, record much shorter bursts of light. A photographic ﬂash can therefore be used to capture high-speed movement on film as well as to correct deficiencies of the normal surrounding lighting. Photoﬂash is now generated electronically, but the earliest form, ﬁrst used in 1864, was a paper bag containing

magnesium wire and some oxygen-rich substance, such as potassium chlorate. When the bag was ignited, the metal burned with an intense ﬂash. A contemporary observer reported that "this quite unsafe device seems to have done nothing worse that engulf the room in dense smoke and lead to pictures of dubious quality and odd poses.”

The evolution of the photoﬂash was slow, ﬂashbulbs, containing fine wire made of a metal, such as magnesium or aluminum, capable of being ignited in an atmosphere of pure oxygen at low pressure, were introduced only in the 1920's. In the earliest type, the metal was separated from the oxygen by a thin glass bulb. The ﬂash was ﬁred by piercing the bulb and allowing the oxygen to come into contact with the metal, which ignited spontaneously. Later bulbs were fired by an electric battery, which heated the wire by passing a small current through it. Other combinations, such as the pairing of oxygen diﬂuoride with zirconium, have also been used. In each case enough energy is given out to heat the oxidizable metal momentarily to a white hot emission of visible light. The smoke particles are so small that they cool rapidly; but since they are white, they contribute to the brilliance by reﬂecting the light from their still glowing neighbors. A slightly bigger form of the metal will burn for a longer time.

The word "it" in paragraph 2 refers to _____.

A. oxygen

B. battery

C. wire

D. current

#Mẫu giáo

1

DH

Dương Hoàn Anh

23 tháng 11 2019

Đáp án C

Từ "it” trong đoạn 2 đề cập đến

A. khí Oxy B. Pin C. dây dẫn D. dòng điện

Căn cứ vào thông tin đoạn 2:

“The ﬂash was fired by piercing the bulb and allowing the oxygen to come into contact with the metal, which ignited spontaneously. Later bulbs were fired by an electric battery, which heated the wire by passing a small current through it.” (Đèn ﬂash được đốt sáng bằng cách xuyên thủng bóng đèn và cho phép oxy tiếp xúc với kim loại, khiến nó tự bốc cháy. Sau đó, những bóng đèn thắp sáng bởi một pin điện, pin này làm nóng dây dẫn bằng cách truyền một dòng điện nhỏ qua nó - tức là dây dẫn.)

Các đáp án còn lại có xuất hiện trong bài nhưng không chính xác nên ta

=> Do đó, đáp án là C

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Lê Quỳnh Anh

16 tháng 11 2018

Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 36 to 42. Light from a living plant or animal is called bioluminescence, or cold light, to distinguish it from incandescence or heat-generating light. Life forms could not produce incandescent light without being burned. Their light is produced in chemicals combining in such a way that little or no measurable heat is produced, and the life forms generating it are unharmed....

Đọc tiếp

Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 36 to 42.

Light from a living plant or animal is called bioluminescence, or cold light, to distinguish it from incandescence or heat-generating light. Life forms could not produce incandescent light without being burned. Their light is produced in chemicals combining in such a way that little or no measurable heat is produced, and the life forms generating it are unharmed. Although bioluminescence is a relatively complicated process, it can be reduced to simple terms. Living light occurs when luciferin and oxygen combine in the presence of luciferase. In a few cases, ﬁreﬂies the most common, an additional compound called ATP is required.

The earliest recorded experiments with bioluminescence in the late 1800s are attributed to Raphael Dubois, who extracted a luminous ﬂuid from a clam, observing that it continued to glow in the test tube for several minutes. He named the substance luciferin, which means “the bearer of life”. In further research, Dubois discovered that several chemicals were required for bioluminescence to occur. In his notes, it was recorded that a second important substance, which he called luciferase, was always present. In later study of small, luminous sea creatures, Newton Harley concluded that luciferin was composed of carbon, hydrogen, and oxygen, which are the building blocks of all living cells. He also proved that there are a variety of luciferin and luciferase, speciﬁc to the plants and animals that produce them.

Much remains unknown, but many scientists who are studying bioluminescence now believe that the origin of the phenomenon may be traced to a time when there was no oxygen in the Earth’s atmosphere. When oxygen was gradually introduced to the atmosphere, it was actually poisonous to life forms, plants and animals produced light to use up the oxygen in a gradual but necessary adaptation. It is speculated that millions of years ago, all life may have produced light to survive. As the millennia passed, life forms on Earth became tolerant of, and ﬁnally dependent on oxygen, and the adaptation that produced bioluminescence was no longer necessary, but some primitive plants and animals continued to use the light for new functions such as mating or attracting prey.

Question 41: Bioluminescence is described as all of the following EXCEPT ______.

A. a complex chemicals process

B. an adaptation of early plants and animals to the environment

C. a form of cold light

D. a poisonous substance

#Mẫu giáo

1

DH

Dương Hoàn Anh

16 tháng 11 2018

Đáp án D

Dịch nghĩa: Sự phát quang sinh học được miêu tả như tất cả những điều sau NGOẠI TRỮ _______.

A. một quá trình hóa học phức tạp

B. một sự thích ứng của những loài động thực vật tiền sử với môi trường

C. một dạng ánh sáng lạnh

D. một chất có độc

Giải thích: Ta thấy các đáp án còn lại đều được nói đến như những đặc tính của sự phát quang sinh học:

A. Đoạn 1: “Although bioluminescence is a relatively complicated process, it can be reduced to simple terms” - “Mặc dù sự phát quang sinh học là một quá trình tương đối phức tạp, nó có thể được giảm xuống đến những khái niệm đơn giản.”

B. Đoạn cuối: “It is speculated that millions of years ago, all life may have produced light to survive” - “Người ta đoán rằng hàng triệu năm về trước, toàn bộ sự sống có thể đã phải tạo ra ánh sáng để sinh tồn.”

C. Câu đầu bài viết: “Light from a living plant or animal is called bioluminescence, or cold light...” - “Ánh sáng từ một loài động vật hay thực vật còn sống được gọi là sự phát quang sinh học, hay ánh sáng lạnh. . .”

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LQ

Lê Quỳnh Anh

22 tháng 2 2019

Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 36 to 42. Light from a living plant or animal is called bioluminescence, or cold light, to distinguish it from incandescence or heat-generating light. Life forms could not produce incandescent light without being burned. Their light is produced in chemicals combining in such a way that little or no measurable heat is produced, and the life forms generating it are unharmed....

Đọc tiếp

Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 36 to 42.

Light from a living plant or animal is called bioluminescence, or cold light, to distinguish it from incandescence or heat-generating light. Life forms could not produce incandescent light without being burned. Their light is produced in chemicals combining in such a way that little or no measurable heat is produced, and the life forms generating it are unharmed. Although bioluminescence is a relatively complicated process, it can be reduced to simple terms. Living light occurs when luciferin and oxygen combine in the presence of luciferase. In a few cases, ﬁreﬂies the most common, an additional compound called ATP is required.

The earliest recorded experiments with bioluminescence in the late 1800s are attributed to Raphael Dubois, who extracted a luminous ﬂuid from a clam, observing that it continued to glow in the test tube for several minutes. He named the substance luciferin, which means “the bearer of life”. In further research, Dubois discovered that several chemicals were required for bioluminescence to occur. In his notes, it was recorded that a second important substance, which he called luciferase, was always present. In later study of small, luminous sea creatures, Newton Harley concluded that luciferin was composed of carbon, hydrogen, and oxygen, which are the building blocks of all living cells. He also proved that there are a variety of luciferin and luciferase, speciﬁc to the plants and animals that produce them.

Much remains unknown, but many scientists who are studying bioluminescence now believe that the origin of the phenomenon may be traced to a time when there was no oxygen in the Earth’s atmosphere. When oxygen was gradually introduced to the atmosphere, it was actually poisonous to life forms, plants and animals produced light to use up the oxygen in a gradual but necessary adaptation. It is speculated that millions of years ago, all life may have produced light to survive. As the millennia passed, life forms on Earth became tolerant of, and ﬁnally dependent on oxygen, and the adaptation that produced bioluminescence was no longer necessary, but some primitive plants and animals continued to use the light for new functions such as mating or attracting prey.

Question 36: Which of the following is the main topic of the passage?

A. Cold light

B. Luciferase

C. Primitive plants and animals

D. Earth’s atmosphere

#Mẫu giáo

1

DH

Dương Hoàn Anh

22 tháng 2 2019

Đáp án A

Dịch nghĩa: Chủ đề chính của bài viết là gì?

A. Ánh sáng lạnh

B. Luciferase

C. Thực vật và động vật nguyên thủy

D. Khi hậu trên trái đất

Giải thích: Ta thấy đoạn văn chủ yếu nói về bioluminescence (sự phát quang sinh học) hay còn gọi là cold light (ánh sáng lạnh)

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