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25 tháng 4 2023

1.The flying cars are economical because they run on solar energy.

2.The jetpack uses fans and an engine to lift you off the ground with two.

3.I called the rescue services because my left leg really hurt.

4.Traveling by air is more affordable, so people like to fly anywhere like a bird.

II. Read the following passage carefully, then do as directed : (5 marks)Thinking about how we will be travelling in 10 or 20 years is very interesting. Will we still be using planes or will we be flying our cars from Paris to London? Here are some suggestions.- SkyTrain: Currently being developed at NASA, SkyTrain looks like the monorail at Disney World. Moving at 240km/h and using small amount of energy, it could be the future of city transportation. SkyTrain has the passenger capacity of a...
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II. Read the following passage carefully, then do as directed : (5 marks)
Thinking about how we will be travelling in 10 or 20 years is very interesting. Will we still be using planes or will we be flying our cars from Paris to London? Here are some suggestions.
- SkyTrain: Currently being developed at NASA, SkyTrain looks like the monorail at Disney World. Moving at 240km/h and using small amount of energy, it could be the future of city transportation. SkyTrain has the passenger capacity of a 6-lane highway.
- Flying cars: Zhu Wenxi and Lai Zexin, Chinese students, have designed a solar-powered flying car that doesn’t need a runway to take off. If you have about 200 hundred thousand dollars, you will own this vehicle soon.
- An electric mininus: The minibus Cameo, designed by Martin Pes, can carry 32 passengers but it is small enough to get its way out of a traffic jam. Its electric motor and low weight mean that it can be recharged in seconds while stopping and it has zero emission.
- An eco-taxi: Taxis are bad for the environment and traffic jams. We enter eco-taxi, and individual taxis form a train powered by solar panels.
1. Decide whether the statements below are True (T) or False (F) : (2,5 marks)
a. SkyTrain is fast but cannot be used as a means of transport in the city. …………
b. Flying cars designed by Zhu Wenxi and Lai Zexin run on solar energy. …………
c. A long runway is necessary for flying cars to take off. …………
d. Because it is small, an electric minibus can avoid traffic jams. …………
e. Several eco-taxis can form a line moving together, using solar energy. …………
2. Answer the following sentences: (2,5 marks)
a. How fast can SkyTrain travel?
………………………………….............................................................................................
b. Where are the designers of flying cars from?
……………………………………………………………………………………………………………….
c. How much money does a flying car cost?
……………………………………………………………………………………………………………….
d. Why should we take eco-taxi instead of other taxis?
……………………………………………………………………………………………………………….
e. Are you interested in these means of transport? Why?
………………………………………………………………………………………………

1
12 tháng 12 2019

1.
a. F
b. T
c. F
d. T
e. T

2. 
a. SkyTrain can travel at the speed of 240km/hr.
b. The designers of flying cars are from China. 
c. The cost of a flying car is $200.
d. We should take eco-taxi because it's good for the environment and will avoid traffic jams.
e. Yes, I'm interested in this means of transportation because they give me a chance to protect the environment. 

giúp mk vs !!! 1. The crowd became increasingly angry at the long delay. -> _____________________ the delay (was), ________________________ the crowd became. 2. The value of a picture depends on how famous the artist is. -> ________________________ an artist (is), ______________________________ the picture is. 3. How well I sleep depends on how late I go to bed. -> ____________________________ I go to bed, __________________________I sleep. 4. I don’t spend much time with my family...
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giúp mk vs !!!

1. The crowd became increasingly angry at the long delay.

-> _____________________ the delay (was), ________________________ the crowd became.

2. The value of a picture depends on how famous the artist is.

-> ________________________ an artist (is), ______________________________ the picture is.

3. How well I sleep depends on how late I go to bed.

-> ____________________________ I go to bed, __________________________I sleep.

4. I don’t spend much time with my family because I work so hard.

->__________________________ I work, ____________________________ I spend with my family.

5. The traffic moves very slowly as more cars comes into the city.

->__________________ cars come into the city, _______________________ the traffic moves.

6. How much you sweat depends on how hot you get.

-> ____________________ you get, _________________________ you sweat.

7. It’s hard to concentrate when you are tired.

-> _____________________ you are, _________________________ it is to concentrate.

8. How much petrol a car uses depends on how big the engine is.

-> _______________________ the engine (is), ______________________ the car uses.

9. If a knife is sharp, it is easy to cut something with.

->________________________ a knife (is), _______________________ it is to cut something.

10. I became increasingly nervous about her fast driving.

->______________________ she drove, _________________________ I became.

0
* 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 24 to 30.   Almost all living things ultimately get their energy from the sun. In a process called photosynthesis, plants, algae, and some other organisms capture the sun's energy and use it to make simple sugars such as glucose. Most other organisms use these organic molecules as a source of energy. Organic materials contain a tremendous amount of...
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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 24 to 30.

  Almost all living things ultimately get their energy from the sun. In a process called photosynthesis, plants, algae, and some other organisms capture the sun's energy and use it to make simple sugars such as glucose. Most other organisms use these organic molecules as a source of energy. Organic materials contain a tremendous amount of energy. As food, they fuel our bodies and those of most other creatures. In such forms as oil, gas, and coal, they heat our homes, run our factories and power our cars.

  Photosynthesis begins when solar energy is absorbed by chemicals called photosynthetic pigments that are contained within an organism. The most common photosynthetic pigment is chlorophyll. The bright green color characteristic of plants is caused by it. Most algae have additional pigments that may mask the green chlorophyll. Because of these pigments, algae may be not only green but brown, red, blue or even black.                         

  In a series of enzyme-controlled reactions, the solar energy captured by chlorophyll and other pigments is used to make simple sugars, with carbon dioxide and water as the raw materials. Carbon dioxide is one of very few carbon- containing molecules not considered to be organic compounds. Photosynthesis then converts carbon from an inorganic to an organic form. This is called carbon fixation. In this process, the solar energy that was absorbed by chlorophyll is stored as chemical energy in the form of simple sugars like glucose. The glucose is then used to make other organic compounds. In addition, photosynthesis produces oxygen gas. All the oxygen gas on earth, both in the atmosphere we breathe and in the ocean, was produced by photosynthetic organisms. Photosynthesis constantly replenishes the earth's oxygen supply.

  Organisms that are capable of photosynthesis can obtain all the energy they need from sunlight and do not need to eat. They are called autotrophs. Plants are the most familiar autotrophs on land. In the ocean, algae and bacteria are the most important autotrophs. Many organisms cannot produce their own food and must obtain energy by eating organic matter. These are called heterotrophs.

 

(Hooked on TOEFL Reading - LinguaForum

It can be inferred from the passage that the author considers solar energy to be_________.

A. useless to most bacteria and algae 

B. a permanent and everlasting source of energy 

C. a perfect solution to the energy problem 

D. essential for every organism on earth

1
16 tháng 2 2018

       Câu đề bài: Ta có thể suy ra từ đoạn văn rằng tác giả coi năng lượng mặt trời là _________ .

Đáp án D: cần thiết cho mọi sinh vật trên trái đất Các đáp án còn lại:

A. Vô dụng với hầu hết vi khuẩn và tảo

B. Nguồn năng lượng lâu dài và vĩnh cửu

C. Một giải pháp hoàn hảo cho vấn đề năng lượng

Thông tin trong bài:

Photosynthesis begins when solar energy is absorbed by chemicals called photosynthetic pigments that are contained within an organism. In addition, photosynthesis produces oxygen gas. All the oxygen gas on earth, both in the atmosphere we breathe and in the ocean, was produced by photosynthetic organisms. Photosynthesis constantly replenishes the earth's oxygen supply. - Quá trình quang hợp bắt đầu khi năng lượng mặt trời được hấp thụ bởi các hóa chất gọi là sắc tố quang hợp được chứa trong một sinh vật. Ngoài ra, quang hợp tạo ra khí oxy. Tất cả khí oxy trên trái đất, cả trong khí quyển chúng ta hít thở và trong đại dương, được sinh ra bởi các sinh vật quang hợp. Quang hợp liên tục bổ sung nguồn cung cấp oxy của trái đất

* 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 24 to 30.  Almost all living things ultimately get their energy from the sun. In a process called photosynthesis, plants, algae, and some other organisms capture the sun's energy and use it to make simple sugars such as glucose. Most other organisms use these organic molecules as a source of energy. Organic materials contain a tremendous amount of...
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 24 to 30.

  Almost all living things ultimately get their energy from the sun. In a process called photosynthesis, plants, algae, and some other organisms capture the sun's energy and use it to make simple sugars such as glucose. Most other organisms use these organic molecules as a source of energy. Organic materials contain a tremendous amount of energy. As food, they fuel our bodies and those of most other creatures. In such forms as oil, gas, and coal, they heat our homes, run our factories and power our cars.

  Photosynthesis begins when solar energy is absorbed by chemicals called photosynthetic pigments that are contained within an organism. The most common photosynthetic pigment is chlorophyll. The bright green color characteristic of plants is caused by it. Most algae have additional pigments that may mask the green chlorophyll. Because of these pigments, algae may be not only green but brown, red, blue or even black.                                                        

  In a series of enzyme-controlled reactions, the solar energy captured by chlorophyll and other pigments is used to make simple sugars, with carbon dioxide and water as the raw materials. Carbon dioxide is one of very few carbon- containing molecules not considered to be organic compounds. Photosynthesis then converts carbon from an inorganic to an organic form. This is called carbon fixation. In this process, the solar energy that was absorbed by chlorophyll is stored as chemical energy in the form of simple sugars like glucose. The glucose is then used to make other organic compounds. In addition, photosynthesis produces oxygen gas. All the oxygen gas on earth, both in the atmosphere we breathe and in the ocean, was produced by photosynthetic organisms. Photosynthesis constantly replenishes the earth's oxygen supply.

  Organisms that are capable of photosynthesis can obtain all the energy they need from sunlight and do not need to eat. They are called autotrophs. Plants are the most familiar autotrophs on land. In the ocean, algae and bacteria are the most important autotrophs. Many organisms cannot produce their own food and must obtain energy by eating organic matter. These are called heterotrophs.

(Hooked on TOEFL Reading - LinguaForum)

It can be inferred from the passage that the author considers solar energy to be_________.

A. useless to most bacteria and algae

B. a permanent and everlasting source of energy

C. a perfect solution to the energy problem

D. essential for every organism on earth

1
10 tháng 12 2017

ĐÁP ÁN D

Câu đề bài: Ta có thể suy ra từ đoạn văn rằng tác giả coi năng lượng mặt trời là _________ .

Đáp án D: cần thiết cho mọi sinh vật trên trái đất Các đáp án còn lại:

A. Vô dụng với hầu hết vi khuẩn và tảo

B. Nguồn năng lượng lâu dài và vĩnh cửu

C. Một giải pháp hoàn hảo cho vấn đề năng lượng

Thông tin trong bài:

Photosynthesis begins when solar energy is absorbed by chemicals called photosynthetic pigments that are contained within an organism. In addition, photosynthesis produces oxygen gas. All the oxygen gas on earth, both in the atmosphere we breathe and in the ocean, was produced by photosynthetic organisms. Photosynthesis constantly replenishes the earth's oxygen supply. - Quá trình quang hợp bắt đầu khi năng lượng mặt trời được hấp thụ bởi các hóa chất gọi là sắc tố quang hợp được chứa trong một sinh vật. Ngoài ra, quang hợp tạo ra khí oxy. Tất cả khí oxy trên trái đất, cả trong khí quyển chúng ta hít thở và trong đại dương, được sinh ra bởi các sinh vật quang hợp. Quang hợp liên tục bổ sung nguồn cung cấp oxy của trái đất

Have you heard about pop festival? Yes, it(be) good if Express(play). They're a great band Will you be able to go? If I(ask) my boss, he(give) me some time off. I expect It is too expensive to hire a minibus? It(not cost) much if we all(share) the cost. Combine two sentences into one, using the connectives in brackets 1.You can go home. You've finished exercise(when) 2. I don't get many oppoturnities to practice my English. I find it difficult to remember everything I...
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Have you heard about pop festival?

Yes, it(be) good if Express(play). They're a great band

Will you be able to go?

If I(ask) my boss, he(give) me some time off. I expect

It is too expensive to hire a minibus?

It(not cost) much if we all(share) the cost.

Combine two sentences into one, using the connectives in brackets

1.You can go home. You've finished exercise(when)

2. I don't get many oppoturnities to practice my English. I find it difficult to remember everything I study(therefore)

3. I'm practising speaking English a lot. I don't want to fail in the oral test( because)

4. The world's energy resources are limited. We should use them economically(so)

5. The country could face an energy crisis. Demand continues to rise(if)

6. You can't borrow my dictionary. You bring it back on Monday(unless)

7. The cost of installation is very high. Solar domestic heating systems are economical to use.

8. Solar panels are placed on the roof of a house. The Sun's energy is used to heat water.

9. I don't agree with a lot of his teaching methods. He is a good teacher( however)

10. We'd better not waste water. We won't have enough to drink sooner or later(or)

1
19 tháng 11 2017

Have you heard about pop festival?

Yes, it(be) is good if Express(play) to play. They're a great band

Will you be able to go?

If I(ask) asked my boss, he(give)would give me some time off. I expect

It is too expensive to hire a minibus?

It(not cost)won't cost much if we all(share)share the cost.

Combine two sentences into one, using the connectives in brackets

1.You can go home. You've finished exercise(when)

=>You can go home when you finish exercise

2. I don't get many oppoturnities to practice my English. I find it difficult to remember everything I study(therefore)

=> I don't get many oppoturnities to practice my English therefore I find it difficult to remember everything I study

3. I'm practising speaking English a lot. I don't want to fail in the oral test( because)

=> I'm practising speaking English a lot because I don't want to fail in the oral test

4. The world's energy resources are limited. We should use them economically(so)

=> The world's energy resources are limited so We should use them economically

5. The country could face an energy crisis. Demand continues to rise(if)

=> The country could face an energy crisis if Demand continues to rise

6. You can't borrow my dictionary. You bring it back on Monday(unless)

=> You can't borrow my dictionary unless You bring it back on Monday

7. The cost of installation is very high. Solar domestic heating systems are economical to use.( although ?

=>The cost of installation is very high although Solar domestic heating systems are economical to use.

8. Solar panels are placed on the roof of a house. The Sun's energy is used to heat water.

=>Solar panels are placed on the roof of a house because The Sun's energy is used to heat water.

9. I don't agree with a lot of his teaching methods. He is a good teacher( however)

=> I don't agree with a lot of his teaching methods however He is a good teacher

10. We'd better not waste water. We won't have enough to drink sooner or later(or)

=> We'd better not waste water or We won't have enough to drink sooner or later

Many of the world’s cities lie under a permanent blanket of smog. People are concerned about global warming, and fuel prices just keep going up and up. It’s no surprise therefore, that in recent years, car manufacturers have been put under pressure to invent a vehicle that is both cheaper to run and better for the environment. Finally, after much trial and error, it seems as though they might be making progress, and the future of the car industry is beginning to look a little “greener”....
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Many of the world’s cities lie under a permanent blanket of smog. People are concerned about global warming, and fuel prices just keep going up and up. It’s no surprise therefore, that in recent years, car manufacturers have been put under pressure to invent a vehicle that is both cheaper to run and better for the environment. Finally, after much trial and error, it seems as though they might be making progress, and the future of the car industry is beginning to look a little “greener”.

  One of the first ideas which car manufacturers tried was to replace engines which run on fossil fuels with electric motors. Unfortunately, these vehicles had several drawbacks and they didn’t sell very well. The problems were that the batteries of these electric cars ran out very quickly and took a long time to recharge. Also, the replacement energy parts were very expensive.

  However, the idea of electric cars has not been scrapped altogether. Car manufacturers have improved the concept so that environmentally friendly cars can now be efficient and economical as well. This is where the hybrid car, which has both an electric motor and a traditional petrol engine, comes in. The electric motor never needs to be recharged and it is much better for the planet than a traditional car.

  In a hybrid car, the engine is controlled by a computer which determines whether the car runs on petrol, electricity, or both. When the car needs maximum power, for example, if it is accelerating or climbing a steep hill, it uses all of its resources, whereas at steady speeds it runs only on petrol. When slowing down or braking, the electric motor recharges its batteries.

  Hybrid cars are better for the environment because the electric motor can help out whenever it is needed and they have a much smaller engine than a traditional car. Also, hybrid cars on the market are made using materials such as aluminium and carbon fibre, which makes them extremely light. Both of these factors mean that they use far less petrol than normal cars, so they produce less pollution.

 

  Of course, hybrid cars aren’t perfect; they still run on fossil fuel and so pollute the environment to some extent. However, they may be the first step along the road to cleaner, “greener” cars. Car manufacturers are already working on vehicles which run on hydrogen. The only emission from these cars is harmless water vapor. These are still some way in the future, though, as designers need to think of cheap and safe ways of producing, transporting and storing hydrogen, but at last, it looks like we might be heading in the right direction.

Hybrid cars are better for the planet because_______.

A. they produce less harmful gases 

B. they are made of special materials 

C. they use different fuel to normal cars 

D. the electric motor is smaller than a normal engine

1
29 tháng 8 2017

Chọn A                                 Xe hơi kiểu kết hợp là tốt cho hành tinh bởi vì .

A. Chúng tạo ra ít khí độc hại hơn

B. Chúng được làm từ nguyên liệu đặc biệt

C. Chúng sử dụng nhiên liệu khác nhau so với xe hơi thông thường

D. Động cơ điện nhỏ hơn động cơ thông thường.

Thông tin trong bài: Also, hybrid cars on the market are made using materials such as aluminium and carbon fibre, which makes them extremely light. Both of these factors mean that they use far less petrol than normal cars, so they produce less pollution.

  Hơn nữa, xe dùng nhiên liệu kết hợp trên thị trường được làm sử dụng những nhiên liệu như nhôm và sợi carbon, khiến cho chúng cực nhẹ. Cả 2 nhân tố này có nghĩa là chúng sử dụng ít xăng hơn nhiều so với ô tô thông thường, nên chúng gây ra ít ô nhiễm hơn.

Many of the world’s cities lie under a permanent blanket of smog. People are concerned about global warming, and fuel prices just keep going up and up. It’s no surprise therefore, that in recent years, car manufacturers have been put under pressure to invent a vehicle that is both cheaper to run and better for the environment. Finally, after much trial and error, it seems as though they might be making progress, and the future of the car industry is beginning to look a little “greener”....
Đọc tiếp

Many of the world’s cities lie under a permanent blanket of smog. People are concerned about global warming, and fuel prices just keep going up and up. It’s no surprise therefore, that in recent years, car manufacturers have been put under pressure to invent a vehicle that is both cheaper to run and better for the environment. Finally, after much trial and error, it seems as though they might be making progress, and the future of the car industry is beginning to look a little “greener”.

  One of the first ideas which car manufacturers tried was to replace engines which run on fossil fuels with electric motors. Unfortunately, these vehicles had several drawbacks and they didn’t sell very well. The problems were that the batteries of these electric cars ran out very quickly and took a long time to recharge. Also, the replacement energy parts were very expensive.

  However, the idea of electric cars has not been scrapped altogether. Car manufacturers have improved the concept so that environmentally friendly cars can now be efficient and economical as well. This is where the hybrid car, which has both an electric motor and a traditional petrol engine, comes in. The electric motor never needs to be recharged and it is much better for the planet than a traditional car.

  In a hybrid car, the engine is controlled by a computer which determines whether the car runs on petrol, electricity, or both. When the car needs maximum power, for example, if it is accelerating or climbing a steep hill, it uses all of its resources, whereas at steady speeds it runs only on petrol. When slowing down or braking, the electric motor recharges its batteries.

  Hybrid cars are better for the environment because the electric motor can help out whenever it is needed and they have a much smaller engine than a traditional car. Also, hybrid cars on the market are made using materials such as aluminium and carbon fibre, which makes them extremely light. Both of these factors mean that they use far less petrol than normal cars, so they produce less pollution.

 

  Of course, hybrid cars aren’t perfect; they still run on fossil fuel and so pollute the environment to some extent. However, they may be the first step along the road to cleaner, “greener” cars. Car manufacturers are already working on vehicles which run on hydrogen. The only emission from these cars is harmless water vapor. These are still some way in the future, though, as designers need to think of cheap and safe ways of producing, transporting and storing hydrogen, but at last, it looks like we might be heading in the right direction.

The phrase “comes in” in paragraph 2 is closest in meaning to “________”.

A. moves towards the land

B. becomes available at a particular time 

C. joins the inventors in a project

D. finishes a race in particular time

1
15 tháng 12 2019

Chọn B                                 Cụm từ “comes in” trong đoạn văn số 2 gần nghĩa nhất với “ _________ ”.

A. di chuyển về hướng đất

B. có tác dụng tại một thời điểm cụ thể

C.  tham gia với các nhà phát minh trong một dự án

D. kết thúc một cuộc đua trong một thời gian cụ thể.

Thông tin trong bài: This is where the hybrid car, which has both an electric motor and a traditional petrol engine, comes in.

  Đây là lúc mà xe hơi kiểu kết hợp lên ngôi, bao gồm cả động cơ điện và động cơ xăng truyền thống.

  Khi cả động cơ xăng và động cơ điện hoạt động riêng biệt đều không hiệu quả, động cơ kiểu kết hợp trở nên hữu ích và là một lựa chọn tốt.

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 24 to 30.  Almost all living things ultimately get their energy from the sun. In a process called photosynthesis, plants, algae, and some other organisms capture the sun's energy and use it to make simple sugars such as glucose. Most other organisms use these organic molecules as a source of energy. Organic materials contain a tremendous amount of...
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 24 to 30.

  Almost all living things ultimately get their energy from the sun. In a process called photosynthesis, plants, algae, and some other organisms capture the sun's energy and use it to make simple sugars such as glucose. Most other organisms use these organic molecules as a source of energy. Organic materials contain a tremendous amount of energy. As food, they fuel our bodies and those of most other creatures. In such forms as oil, gas, and coal, they heat our homes, run our factories and power our cars.

  Photosynthesis begins when solar energy is absorbed by chemicals called photosynthetic pigments that are contained within an organism. The most common photosynthetic pigment is chlorophyll. The bright green color characteristic of plants is caused by it. Most algae have additional pigments that may mask the green chlorophyll. Because of these pigments, algae may be not only green but brown, red, blue or even black.                       

  In a series of enzyme-controlled reactions, the solar energy captured by chlorophyll and other pigments is used to make simple sugars, with carbon dioxide and water as the raw materials. Carbon dioxide is one of very few carbon- containing molecules not considered to be organic compounds. Photosynthesis then converts carbon from an inorganic to an organic form. This is called carbon fixation. In this process, the solar energy that was absorbed by chlorophyll is stored as chemical energy in the form of simple sugars like glucose. The glucose is then used to make other organic compounds. In addition, photosynthesis produces oxygen gas. All the oxygen gas on earth, both in the atmosphere we breathe and in the ocean, was produced by photosynthetic organisms. Photosynthesis constantly replenishes the earth's oxygen supply.

  Organisms that are capable of photosynthesis can obtain all the energy they need from sunlight and do not need to eat. They are called autotrophs. Plants are the most familiar autotrophs on land. In the ocean, algae and bacteria are the most important autotrophs. Many organisms cannot produce their own food and must obtain energy by eating organic matter. These are called heterotrophs.

 

It can be inferred from the passage that the author considers solar energy to be_________.

A. useless to most bacteria and algae

B. a permanent and everlasting source of energy

C. a perfect solution to the energy problem

D. essential for every organism on earth

1
9 tháng 2 2018

Chọn D

Câu đề bài: Ta có thể suy ra từ đoạn văn rằng tác giả coi năng lượng mặt trời là _________ .

Đáp án D: cần thiết cho mọi sinh vật trên trái đất Các đáp án còn lại:

A. Vô dụng với hầu hết vi khuẩn và tảo

B. Nguồn năng lượng lâu dài và vĩnh cửu

C. Một giải pháp hoàn hảo cho vấn đề năng lượng

Thông tin trong bài:

Photosynthesis begins when solar energy is absorbed by chemicals called photosynthetic pigments that are contained within an organism. In addition, photosynthesis produces oxygen gas. All the oxygen gas on earth, both in the atmosphere we breathe and in the ocean, was produced by photosynthetic organisms. Photosynthesis constantly replenishes the earth's oxygen supply. - Quá trình quang hợp bắt đầu khi năng lượng mặt trời được hấp thụ bởi các hóa chất gọi là sắc tố quang hợp được chứa trong một sinh vật. Ngoài ra, quang hợp tạo ra khí oxy. Tất cả khí oxy trên trái đất, cả trong khí quyển chúng ta hít thở và trong đại dương, được sinh ra bởi các sinh vật quang hợp. Quang hợp liên tục bổ sung nguồn cung cấp oxy của trái đất