B nha bn

B nha

bạn pro

.....is the most expensive city in the world I think it is Tokyo

A. which  B.where  C.why  D.how

a nha k cho mình

Which is the most expensive city in the world 

mk nghĩ vậy !!

Renewable energies (or renewables) are ways to generate energy from (theoreally) unlimited natural resources. These resources are either available with no time limit or replenish more quickly than the rate at which they are consumed.

Renewable energies are generally spoken of as opposed to fossil fuel energies. The fossil fuels’ stocks are limited and non-renewable in the human timescale. The most known examples of these resources are coal, oil or natural gas. On the contrary, renewable energies are produced from renewable sources. Here, we’re talking about energy coming from solar rays, wind or water cycles – all theoreally unlimited on a human scale time.

Renewable energies are also often referred to as “green energies” or “clean energies”. Still, this doesn’t mean that these energies aren’t harmful to the environment and have zero impact. Nonetheless, they have a low environmental impact compared to fossil fuels. That’s why they’re increasingly becoming important elements in companies’ CSR strategies in terms of sustainable development.

There are several types of renewable energies that are produced by different sources such as the sun, wind or water. In fact, these renewables’ power consumption has been growing over the last year. They have provided 8% of the world’s electricity in 2017 and they now cover 1/3 of the power mix in Europe. At the same time, the energy grid gets 1/4 of the total energy in China and 1/6 in the United States, India, and Japan. Let’s learn more about them below.

• Related content:
• Is Solar Energy Really Green And Sustainable?

1 – Solar Energy

This type of renewable energy comes directly from the capture of solar radiation. Here, the solar radiation is absorbed by specific sensors and rebroadcasted following 2 possible operation modes:

• Capturing sun rays and directly converting them into energy through photovoltaic solar panels;
• Capturing, collecting and turning the sunlight into heat that warms up water or air.

Examples of Solar Energy in the World

It’s estimated that in 2017 1,6% of the worldwide generated energy came from solar sources. At the same time, solar power also contributed to 20% of the total energy growth in this same year. Some of the most known sources of solar energy are:

• The Kurnool Ultra Solar Park in India. It has a total generation capacity of 1000MW and over 4 million solar panels installed;
• The Longyangxia Solar Park in China that has a total capacity of 850MW and covers around 25sq km.
• The Kamuthi Solar Facility in India: it has a total capacity of 648MV and covers 10sq km.

Is Solar Energy Renewable or Nonrenewable?

Solar energy is inexhaustible in the sense that it will cease once the solar system’s star – the sun – dies. However, many people wonder if, from a perspective of human’s being able to capture and use solar energy in the long-term, whether solar energy is renewable or nonrenewable.

[Full answer available soon.]

2 – Windpower, a Renewable Energy

Wind power is another renewable energy. Here, the wind’s kine energy makes turbines spin and creates a mechanical movement. Afterward, a generator transforms this mechanical energy into electricity. There are several types of wind renewable energies: onshore wind turbines, off-shore wind turbines and even floating wind turbines. But the operating principles are basically the same for all these types of wind-generated energy.

Examples of Wind Power in the World

Wind power continues has also been growing, In fact, it provided 4.4% of global power generation in 2017. The highest installed wind capacity belongs to China (164GW). At the same time, in the EU, wind power provides 15% or more of the energy generated in several countries such as Germany, Portugal or Lithuania. Some of the most known sources of wind power energy are:

• The Gansu Wind Farm in China. It is still under construction and it will be able to produce 20,000MV of power by 2020;
• The onshore Muppandal Wind Farm in India with a capacity of 1,500MW and over 3000 turbines;
• The Alta Wind Energy Center in the U.S. with a total capacity of 1,548MW that’s expected to reach 3,000MW by 2040;
• The Walney Extension in the UK. It has a total capacity of 659MW and it’s the world’s largest offshore farm.

3 – Hydro-Electric Power

Hydro-electric power consists in the transformation of the kine energy of the water (from rivers, dams, marine currents or tides)  into mechanical energy by turbines.

• Related content:
  • Marine energies: what is it?
  • 5 promising marine energy projects
  • The tidal energy: an example of the tidal turbine DCNS

Examples of hydro-electric power in the world

• The Sihwa Lake Tidal Power Station in South Korea. This is the world’s biggest tidal power installation and it has a capacity of 254 MW;
• The Rance Tidal Power Station in Brittany, France, has a 240 MW capacity;
• The Three Gorges Dam in China is the world’s largest power station in terms of installed capacity (22,500 MW).

4- Biomass

Biomass is made up of organic materials from plants or animals that contain stored energy. The combustion of these natural materials produces renewable energy. Some examples of generating energy from biomass are:

• Directly burning solid biomass garbage or wood to produce heat;
• Converting biomass into biogases such as methane or CO2 due to the bacterial activity that happens in the absence of oxygen (as is the case in landfills);
• Using sugar or corn crops to create biofuels such as bioethanol or biodiesel and mixing them with fossil fuels afterward. As a matter of fact, the world’s biofuels production increased by 3.5% in 2017.

Related content:

• • Palm oil has a huge environmental impact. What’s the impact of its use as a biofuel?
  • What Is Biogas Energy Production?

Examples of Biomass Energy in the World

Some of the most known biomass power plants in the world are:

• The Iron Bridge power station in the UK, with a capacity of 740MW. It uses wood pellets as the main fuel;
• The Alholmenskaft power station in Finland. It has a 260MW energy generation capacity;
• The Polaniec power plant in Poland that uses mainly agricultural by-products and wood residues. It has a 205MW capacity.

5- Geothermal Power as a Renewable Energy

The Earth generates and stores geothermal energy. In other words, radioactive materials decaying inside the Earth are emitting energy. Electricity can be created using directly or indirectly this energy,  depending on the technology implemented. There are 3 main ways to use geothermal energy:

• Generating electricity directly from the Earth’s heat;
• Producing heat directly from hot water boiling on the planet’s surface;
• Using pumps over the shallow ground to heat (and also to cool)

I Viết câu hỏi đuôi

1. I'm unable to solve that problem alone, aren't I ?

2. Dharavi used to be a fishing village with only three thousand people, didn't he/she ?

3. Her brother has lived in Jakarta for more than ten years, hasn't he ?

4. These houses cannot provide enough accommodation, can they ?

5. There were nearly one million people living in this city in 2010, weren't there ?

6. You and I shouldn't go to those streets when it turns dark, should we ?

II. Give the correct form of the words given to complete the sentences:

1. In most big cities, there are many wealthy people, but poverty is still a problem. (poor)

2. Life must be difficult in the slums. (difficulty)

3. .Flight 325 to Ho Chi Minh City is now boarding at the gate 3. (fly)

4. The little looks healthy enough. (health)

5. Farmers need more land than town people. (much)

1. I'm unable to solve that problem alone,....aren't I.......................?

2. Dharavi used to be a fishing village with only three thousand people,...didn't it................?

3. Her brother has lived in Jakarta for more than ten years,.hasn't he..........................?

4. These houses cannot provide enough accommodation,....can they.........................?

5. There were nearly one million people living in this city in 2010,....weren't there.......................?

6. You and I shouldn't go to those streets when it turns dark,...should we......................?

II. Give the correct form of the words given to complete the sentences:

1. In most big cities, there are many wealthy people, but..poverty..........is still a problem. (poor)

2. Life must be....difficult......in the slums. (difficulty)

3. ....Flight...325 to Ho Chi Minh City is now boarding at the gate 3. (fly)

4. The little looks.....healthy.....................enough. (health)

5. Farmers need.....more........................land than town people. (much)

      Although it is not a rush hour, there is a lot of traffic now.

      → It is ...not a rush hour. However, there is a lot of traffic now... 

2. Although he was not selected as the winner, he was still happy.

      →  Despite...the fact that he was not selected as the winner, he was still happy...

3. We often cycled to school two years ago.  → We used ...to cycle to school 2 years ago...

   Although it is not a rush hour, there is a lot of traffic now.

      → It is not a rush hour ; however ,there is a lot of traffic now.

2. Although he was not selected as the winner, he was still happy.

      →  Despite being not selected as the winner, he was still happy.

3. We often cycled to school two years ago.

     → We used to cycle to school two years ago

1. fewer

2. more

3. more

4. fewer

5. less

fill in each blank with"more/less/fewer"

1.february has........fewer .days than january.

2.overpopulation is causing.....more.....problems than the countryside.

3.big cities sufer .....more....pollution than the country side.

4.a teacher needss....less.......calories than a farmer.

5.a healthy child requires......less.....care than a sick one.

I. Choose the best option to complete the sentence: Chọn 1 đáp án đúng nhất để hoàn thành mỗi câu sau

1. I have 8 books and you have 12 books. So you have..............books than me.

A. fewer B. less C. more

2. She has...............friends than me.

A. fewer B. less C. most

3. Nga has ............money than Huong.

A. less B. little C. few

4. Ngan s tea, ................?

A. does she B. doesn’t she C.sin’t she

5. Nam didn’t come there, ...............?

A. did he B. did Nam C. didn’t he

6. Let’s play football this afternoon, ..........?

*Đáp án câu 6 ?

II. Complete the sentences: Hoàn thành các câu hỏi đuôi sau:

1. They don’t play football well, do they ?

2. Open the door, don't you ?

3. Nam didn’t go to school late, did Nam ?

4. Nga is watching TV now, is Nga ?

Điền vào đou bạn ơi !

"Được rồi. Tôi sẽ có một khóa học về châm cứu," Tom nói. (đã đồng ý)

đề bài :vv

1. A. animation B. female C. pavement D. safety

2. A. sign B. cri C. illegal D. direct

3. A. filled B. wanted C. played D. opened

4. A. recommend B. seatbelt C. vehicle D. investigate

5. A. cooked B. talked C.booked D. naked

6. A. delivered B. clicked C. promised D. picked

7. A. needed B. developed C. wanted D. included

8. A. d B. washed C. loved D. jumped

9. A. acting B. actor C. address D. action

10. A. comedy B. boring C. shocked D. long