Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
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.
trời ơi bn chớp kiểu đó ai mà thấy mà giúp bn chớ
đánh máy đi hoặc ns là ở sách hay đề nào, có trên mạng hôn
IV.
1 - d
2 - c
3 - i
4- f
5 - b
6 - g
7 - j
8 - a
9 - h
10 - e
VII.
1 - f
2 - c
3 - e
4 - i
5 - d
6 - j
7 - h
8 - b
9 - a
10 - g
5.
1. How did they go to Ha noi ?
2. When will she bring you some more stamps ?
3. Why don't they like that film ?
4. How long is she going to stay with her grandparents ?
5. Where did you go last night ?
nhiều mà bạn còn chụp ngang nx , khó nhìn lắm , bạn đánh ra ik 
Lam giup mk vs mn
III.
1. beautiful
2. interested
3. disappeared
4. unkind
5. funny
6. hungrily
7. helpful
8. unpleasant
9. decorator
10. seeing
cau 1- beautiful,cau 2- intersted,cau 3-disappear,cau 4 - kindful,cau 5-funny,cau6-hungrily,cau 7- helpful,cau 8 - pleasure,cau 9- decoration,cau 10 -seeing tick nha
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
2. hot
3. crazy
4. slowly
5. few
6. little
7. bad
8. good
9. attractive
10. big
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!