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Advantages of renewable energy
The first advantage of renewable energy is that it can be renewable, has an extremely large reserve, can be endless. Forms of energy such as solar, wind, geothermal, ocean waves, rain... are available and free to use, without fuel costs. Biomass energy also has large reserves and low fuel costs. Compared to traditional energy sources such as coal, oil, natural gas, which are increasingly depleted, only meeting human energy needs for about 50-70 years, this advantage is a strength. outstanding.
The second advantage of renewable energy is that it is abundant and can be widely exploited in all different areas of the earth. For example, with solar energy, people can exploit it anywhere, as long as there is sunlight, it can be used to generate heat to make hot water, heating, and generating electricity through the system. Solar power with solar panels… Or with wind energy, this energy source has been used for hundreds of years to move sailing boats, hot air balloons, windmills for irrigation systems. … or the current trend is to produce electricity from wind in many countries around the world.
Despite many great advantages, renewable energy also has some disadvantages, such as:
Due to the influence of nature, renewable energy is less stable than traditional energy sources. Solar energy can only be exploited during the day on sunny days, and at night or on cloudy and rainy days, the system will not work. Or with wind energy, wind turbines can only generate electricity at times when the wind speed is in the range of 4-25 m/s. Wind speed must be at least 4 m/s for the wind turbines to start running smoothly and generate electricity, but if it exceeds 25 m/s, the turbines will stop working to avoid damage in windy conditions. strong.
Requires advanced technology and high cost is also a drawback of renewable energy. To take advantage of renewable energy sources to generate electricity, it requires advanced technology and relatively high investment costs. Currently, the cost of electricity generation from renewable energy is generally higher than the cost from fossil energy. However, the development of renewable energy in the global trend has helped to reduce costs and increase efficiency, gradually improving this shortcoming.
ko thể tái tạo lại được sau khi đã sử dụng
nếu như dùng lãng phí quá thì nguồn năng lượng ko tái tạo sẽ vĩnh viễn "bay khỏi trái đất"
đắt, làm ô nhiễm môi trường
There are many types of energy sources. In a world where the instability of both society and nature is increasing, the issue of energy is a hot issue of great concern. Fossil energy sources, which have been considered as the main source of energy, are gradually becoming scarce and are also the cause of many immobility and disputes between countries around the world. The following energy sources are available: Nuclear Energy, Compressed Natural Gas; Biomass energy; Geothermal energy. Meanwhile, as scientists predict, with the current rate of exploitation and use of fossil resources, within a few centuries our descendants will have to bear serious consequences. Since then, the need for alternative energy sources has become more and more urgent, and more and more alternative energy research projects have been started and developed. However, not 100% of them are suitable for future development.
Paragraph:
The Earth is gradually running out of resources. Resources are scarce day by day, so scientists are researching and looking for new resources. In temperate countries, due to have many the wind, the wind is used to generate electricity. In tropical countries, due to having much sunshine, the sunshine is used to generate electricity. And a lot of countries in the world use different resources instead of using water to generate electricity.
Traslate:
Trái đất đang dần cạn kiệt tài nguyên. Nguồn tài nguyên khan hiếm từng ngày, vì vậy các nhà khoa học đang nghiên cứu và tìm kiếm những nguồn tài nguyên mới. Ở các nước ôn đới, do có nhiều gió nên gió được dùng để sản xuất điện. Ở các nước nhiệt đới, do có nhiều ánh nắng mặt trời nên ánh nắng mặt trời được sử dụng để phát điện. Và có rất nhiều quốc gia trên thế giới sử dụng các nguồn tài nguyên khác nhau thay vì chỉ sử dụng nước để tạo ra điện.
Enviroment is neccessary thing for this life. Enviroment is the air we breath, the water people drink and is everything they need for their life. But now the most important thing for the life is being polluted. This pollution affects the health of all living things. Air is damaged by lorry fumes and car, and power stations create acid rain which can destroys entire lakes and forests. When fossil fuels: gas, oil and coal are burned to provide energy for cooking, lighting etc. they form polluting gases. Not only on land but also in the sea, oils spills pollute sea water and kill marine life; chemical waste from sewage works and factories, and artificial fertilisers from farmland, pollute river water, spreading disease, and killing wildlife. Everything is being caused by human’s existence. Humans create rubbish! Each household produces about one tonne of rubbish each year! Most of this is taken away by dustmen and burned in incinerators or buried in enormous landfill sites – both of these actions can be dangerous for our environment.
But only people can change and solve it. Pollution could be prevented by all thing we do each day. First people can use recycled paper to save trees. Second try to avoid using plastic. It is hard to recycle. People should refuse to use carrier bags. If people can not avoid buying plastic bags, they should use re-use plastic bags many times. Finally people must take their old clothes to charity shops. People also should save energy to protect environment. Switching off all electric things when they are not in use, walk or use a bicycle instead of car for short trips, keep healthy life and keep clean atmosphere.
Keep clean environment isn’t only all ways are mentioned before but also to protect natural resources. That is the way to conserver wild life. First we need to conserve the old forest, rainforest, build more safari and national park, and plant more trees to make place to live for wild animals. Second we need to prohibit hunters who hunt animals too many out of the law allowance.
Finally, we now know that enviroment is the most important thing for life and we know how to protect and use it scientifically. Everyday we invent and find more and more way to protect enviroment. I hope that in the future the earth will be cleaner.
Đây nhé bạn! bạn học chương trình mới phải không? Thế thì chắc đoạn văn này bạn sẽ hiểu một cách dễ dàng!
With fast growth of civilization there is also an ever mounting need for energy. Energy may be in the form of fuels or electricity. Petrol is a liquid fuel which is used widely nowadays. But this kind of fuels is likely to be exhausted at the rate man is using it recently.
To meet the challenge, various methods have been suggested. One is to minimize the man’s demand in using the energy. Non-essential consumption should be minimized. During certain days of the year, people all over the world turn off the electricity for 1 hour to save the energy. Modern gadgets consuming energy should only be used when they are absolutely necessary.
Energy conservation is possible through modernization of plant and equipment. People should replace the obsolete equipment by the modern ones.
Energy can be saved on transport by the following methods. People should commute by the rail rather than by cars and vans. The transport must be improved with a view to sparing the energy. Cities must be planned in such a way that the commuting distance from this place to others is minimized.
In industry, many things could be done to reduce waste of energy or to economize energy. The machine maintenance needs to be tightened; heater must be utilized properly. When systems are streamlined, economy in fuel is obvious. Instead of using materials requiring higher energy, those which require lower energy should be used.
We hope man with his ever rising urge for existence will cope up with this urgent problem and find alternatives.
(Một số từ mk tra Google dịch đấy. Không biết có sai ko mong bạn sửa giùm mình. Hì Hì)
At present, most of our energy comes from fossil fuels (coal, oil and natural gas). However, reserves are limited. Because demand for electricity is rising rapidly, fossil fuels will be exhausted in a relatively short time. Therefore, people must develop and use alternative energy sources.
An alternative energy source is nuclear power. Nuclear power can provide enough electricity for the needs of the world for hundreds of years, but it can be very dangerous. An alternative source of geothermal energy comes from deep within the earth. Scientists use heat to generate energy. However, this energy is only available in some parts of the world.
Sun, water and wind are alternative sources of energy. Wind rotating the windmill and moving the sailboat. It's a clean source and a lot of energy. Unfortunately, if the wind does not blow, there is no wind energy. As water moves from one place to another, it makes energy. However, people have to build dams to use this energy source. The dams cost a lot of money, so water is expensive too.
The sun releases large amounts of energy each day. This energy can be converted into electricity. Many countries use solar energy for their daily lives. Solar panels on the roof can generate enough energy to heat or cool the entire home. Solar energy is not only abundant and infinite but also clean and safe.
Despite some drawbacks, the potential of alternative energy sources is enormous. However, how to make full use of the energy resources is a question for researchers all over the world.
Translate into English
Hiện nay, phần lớn năng lượng của chúng ta là từ nhiên liệu hóa thạch (than, dầu và khí tự nhiên). Tuy nhiên, trữ lượng còn hạn chế. Do nhu cầu điện tăng nhanh nên nhiên liệu hóa thạch sẽ cạn kiệt trong một thời gian tương đối ngắn. Do đó, người dân phải phát triển và sử dụng các nguồn năng lượng thay thế.
Một nguồn năng lượng thay thế là điện hạt nhân. Năng lượng hạt nhân có thể cung cấp điện đủ cho nhu cầu của thế giới hàng trăm năm, nhưng nó có thể rất nguy hiểm. Một nguồn năng lượng địa nhiệt thay thế đến từ sâu trong lòng đất. Các nhà khoa học sử dụng nhiệt để tạo ra năng lượng. Tuy nhiên, năng lượng này chỉ có ở một số nơi trên thế giới.
Mặt trời, nước và gió là những nguồn năng lượng thay thế. Gió xoay cối xay gió và di chuyển thuyền buồm. Đó là một nguồn sạch và rất nhiều năng lượng. Thật không may, nếu gió không thổi, không có năng lượng gió. Khi nước di chuyển từ nơi này sang nơi khác, nó làm cho năng lượng. Tuy nhiên, người ta phải xây đập để sử dụng nguồn năng lượng này. Các đập tốn rất nhiều tiền, vì vậy nước cũng đắt.
Mặt trời phát ra lượng năng lượng lớn mỗi ngày. Năng lượng này có thể được chuyển thành điện. Nhiều quốc gia sử dụng năng lượng mặt trời cho cuộc sống hàng ngày của họ. Các tấm pin mặt trời trên mái có thể tạo ra đủ năng lượng để sưởi ấm hoặc làm mát toàn bộ ngôi nhà. Năng lượng mặt trời không chỉ phong phú và vô hạn mà còn sạch sẽ và an toàn.
Mặc dù có một số hạn chế, tiềm năng của các nguồn năng lượng thay thế là rất lớn. Tuy nhiên, làm thế nào để tận dụng các nguồn năng lượng là một câu hỏi cho các nhà nghiên cứu trên toàn thế giới.
_ Good luck _
Solar energy makes us have solar electricity, light to live. If you don't have solar energy, you will have to use electricity, but using electricity will cause a fire, so solar energy is very good.
Energy is very important in our daily life. We use energy for almost everything we do. However energy is limited. We should do the following things to save energy. Firstly, we should use electricity more efficiently. Secondly, we had better reduce our electricity bills. Besides, it’s necessary to turn off the lights when leaving a room or before going to bed to save energy. Moreover, we ought to reduce the use of fossil fuels. In short, we should try our best to save energy for our future and for our planet’s future.
1 số dạng nha bạn :
bài 1 : chọn đáp án đúng để điền vào chỗ trống trong các câu sau :
1. she is .... singer i've ever me
a . worse c. the worst
b. bad d. badly
2. my house is .... hers
a. cheaper b. cheap than
c. more cheap than d. cheaper than
3. tom is ... than david
a. handsome
b. the more handsome
c. more handsome
d. the most handsome
4. a boat is .... than a plane
a. slower
b. slowest
c. more slow
d. more slower
5. it was .... day of year
a. the colder
b. the coldest
c. coldest
d. colder
bài 2 : điền vào chỗ trống dạng so sánh đúng trong ngoặc
1. he is ( clever ) ...... student in my group
2. she can't stay ( long ) ..... than 30 minutes
3. it is ( good ) .... holiday i've had
4. your accent is ( bad ) .... than me
5. which plant is ( close ) .... to the sun ?
bài 3 : viết lại câu sao cho nghĩa ko thay đổi
1. her old house is bigger than her new one
=> her new house ......
2. he works much . he feel tired.
=> the more ......
3. we set off soon . we will arrive soon
=> the sooner ......
ok nha bạn đó là 1 số dạng bài , đáng lẽ mình sẽ cho nhiều câu cơ nhưng mình ko có thời gian nên chỉ ghi vài câu thôi nha
Tham khảo:
BÀI LUYỆN TẬP VỀ SO SÁNH VỚI TÍNH TỪ VÀ TRẠNG TỪ
(Exercise on comparison)
Bài 1: Viết dạng so sánh hơn và so sánh hơn nhất của các tính từ và trạng từ sau:
|
Tính từ/ Trạng từ |
So sánh hơn |
So sánh hơn nhất |
|
1. beautiful |
|
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2. hot |
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3. crazy |
|
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4. slowly |
|
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5. few |
|
|
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6. little |
|
|
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7. bad |
|
|
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8. good |
|
|
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9. attractive |
|
|
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10. big |
|
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Bài 2: Chọn đáp án đúng để điền vào chỗ trống trong các câu sau.
1. She is ....... singer I’ve ever met.
A. worse B. bad C. the worst D. badly
2. Mary is ....... responsible as Peter.
A. more B. the most C. much D. as
3. It is ....... in the city than it is in the country.
A. noisily B. more noisier C. noisier D. noisy
4. She sings ……….. among the singers I have known.
A. the most beautiful B. the more beautiful
C. the most beautifully D. the more beautifully
5. She is ....... student in my class.
A. most hard-working B. more hard-working
C. the most hard-working D. as hard-working
6. The English test was ....... than I thought it would be.
A. the easier B. more easy C. easiest D. easier
7. English is thought to be ....... than Math.
A. harder B. the more hard C. hardest D. the hardest
8. Jupiter is ....... planet in the solar system.
A. the biggest B. the bigger C. bigger D. biggest
9. She runs …… in my class.
A. the slowest B. the most slow C. the slowly D. the most slowly
10. My house is ....... hers.
A. cheap than B. cheaper C. more cheap than D. cheaper than
11. Her office is ....... away than mine.
A. father B . more far C. farther D. farer
12. Tom is ....... than David.
A. handsome B. the more handsome
C. more handsome D. the most handsome
13. He did the test ……….. I did.
A. as bad as B. badder than C. more badly than D. worse than
14. A boat is ....... than a plane.
A. slower B. slowest C. more slow D. more slower
15. My new sofa is ....... than the old one.
A. more comfortable B. comfortably
C. more comfortabler D. comfortable
16. My sister dances ……….. than me.
A. gooder B. weller C. better D. more good
17. My bedroom is ....... room in my house.
A. tidier than B. the tidiest
C. the most tidy D. more tidier
18. This road is ....... than that road.
A. narrower B. narrow C. the most narrow D. more narrower
19. He drives ……. his brother.
A. more careful than B. more carefully
C. more carefully than D. as careful as
20. It was ....... day of the year.
A. the colder B. the coldest C. coldest D. colder
Bài 3: Điền vào chỗ trống dạng so sánh đúng của từ trong ngoặc.
1. He is (clever) ……………………. student in my group.
2. She can’t stay (long) …………………….than 30 minutes.
3. It’s (good) ……………………. holiday I’ve had.
4. Well, the place looks (clean) …………………….now.
5. The red shirt is better but it’s (expensive) ……………………. than the white one.
6. I’ll try to finish the job (quick).…………………….
7. Being a firefighter is (dangerous) ……………………. than being a builder.
8. Lan sings ( sweet ) ………………..than Hoa
9. This is (exciting) ……………………. film I’ve ever seen.
10. He runs ( fast )………………….of all.
11. My Tam is one of (popular) ……………………. singers in my country.
12. Which planet is (close) ……………………. to the Sun?
13. Carol sings as (beautiful) …………………….as Mary, but Cindy sings the (beautiful) …………………….
14. The weather this summer is even (hot) ……………………. than last summer.
15. Your accent is ( bad ) …………………..than mine.
16. Hot dogs are (good) …………………….than hamburgers.
17. They live in a (big) ……………………. house, but Fred lives in a (big) ……………………. one.
18. French is considered to be (difficult) …………………….than English, but Chinese is the (difficult) …………………….language.
19. It’s the (large)……………………. company in the country.
Bài 4: Viết lại các câu sau sao cho nghĩa không đổi.
1. Her old house is bigger than her new one.
-> Her new house…………………………………….........
2. No one in my class is taller than Peter.
-> Peter ……………………………………………….
3. The black dress is more expensive than the white one.
-> The white dress ……………………………………………
4. According to me, English is easier than Maths.
-> According to me, Maths ………………………………….
5. No one in my group is more intelligent than Mary.
-> Mary ……………………………………………………….
6. No river in the world is longer than the Nile.
-> The Nile …………………………………………………..
7. Mount Everest is the highest mountain in the world.
-> No mountain ……………………………………………...
8. This is the first time I have ever met such a pretty girl.
-> She is ……………………………………………………..
9. He works much. He feels tired.
-> The more …………………………………………………
10. This computer works better than that one.
-> That computer ……………………………………………..
11. The apartment is big. The rent is high.
-> The bigger ………………………………………………….
12. We set off soon. We will arrive soon.
-> The sooner ……………………………………………………
13. The joke is good. The laughter is loud.
-> The better ……………………………………………….……..
14. She gets fat. She feels tired.
-> The fatter ……………………………………………….………
15. As he gets older, he wants to travel less.
-> The older ……………………………………………….………
16. The children are excited with the difficult games.
-> The more ……………………………………………….………
17. People dive fast. Many accidents happen.
-> The faster ……………………………………………….………
18. I meet him much. I hate him much
-> The more ……………………………………………….………
19. My boss works better when he is pressed for time,
-> The less ……………………………………………….…………
20. As he has much money, he wants to spend much.
-> The more ……………………………………………….…………
21. If you read many books, you will have much knowledge.
-> The more ……………………………………………………………
22. He speaks too much and people feel bored.
-> The more ……………………………………………………………
23. The growth in the economy makes people’s living condition better.
-> The more ……………………………………………………………..
24. People learn a lot of things as they travel far.
-> The farther …………………………………………………………….
Chúc bạn học tốt!
Solar energy collected on Earth is the energy of the stream of electromagnetic radiation coming from the Sun to Earth. We will continue to receive this stream of energy until the nuclear reaction on the Sun runs out of fuel, about 5 billion years from now.
This energy can be obtained directly through the photoelectric effect, which converts the solar photons energy into electricity, as in the solar cell. The energy of the photons can also be absorbed to heat objects, i.e. convert to heat, used for solar water heaters, or boil water in the solar tower's thermoelectric machines, or heat systems such as solar air conditioners.
The energy of the photons can be absorbed and converted into energy in the chemical bonds of photochemical reactions.
A natural photochemical reaction is photosynthesis. This process is thought to have stored solar energy in non-renewable fossil fuel sources that the industries of the nineteenth to twenty-first centuries had been making use of. It is also the process that energizes all natural biological activities, for livestock traction and firewood, traditional renewable bioenergy sources. In the future, this process could help create renewable energy sources in biofuels, such as liquid fuels (biodiesel, vegetable oil fuel), gas (biogas) or solid. .
Solar energy is also absorbed by the Earth's hydrosphere and Earth's atmosphere to produce meteorological phenomena containing exploitable forms of energy reserves. The Earth, in this energy model, resembles the water heater of the early heat engines, converting the heat absorbed from the Sun's photons into the kinetic energy of the currents of water, steam and air. , and alter the chemical and physical properties of these flows.
The potential of rainwater can be stored in dams and run the generator of hydroelectric plants. One form of making use of the energy from rivers and streams that existed before hydroelectricity was the water mill. The currents of the sea can also move the generator of a power plant using the currents of the sea.
The flow of the air, or wind, can generate electricity by turning a wind turbine. Before wind power generators were introduced, windmills were used to grind grain. Wind energy also causes wave motion across the sea surface. This movement can be utilized in power plants using waves.
Oceans on Earth have a greater specific heat than air and therefore change temperature more slowly than air when absorbing the same heat of the Sun. The ocean is hotter than air at night and colder than air during the day. This difference in temperature can be exploited to run heat engines in power plants that use the heat of the sea.
When the absorbed heat from the Sun's photons evaporates the seawater, some of that energy is stored in separating the salt from the salt water of the sea. The power plant uses the reaction of fresh water - salt water reclaim this energy when it brings fresh water from the river back to the sea.