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A rocket uses fuel to make power for the engine. The fuel is set on fire inside the rocket. As the fuel burns, it creates gases that have great pressure. These gases are blasted out of the rocket engines.            These gases all go out the bottom of the rocket engine where it is open. They come out so fast and with so much power that the rocket is pushed up. It is pushed up so hard that the rocket overcomes the force of gravity, which tries to keep everything on the ground. The force that...
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A rocket uses fuel to make power for the engine. The fuel is set on fire inside the rocket. As the fuel burns, it creates gases that have great pressure. These gases are blasted out of the rocket engines.

            These gases all go out the bottom of the rocket engine where it is open. They come out so fast and with so much power that the rocket is pushed up. It is pushed up so hard that the rocket overcomes the force of gravity, which tries to keep everything on the ground. The force that pushes up against the front of the rocket is called thrust.

            Unlike an airplane, a rocket does not use wings to help it fly. It just uses the power and force created by the burning fuel to make enough thrust.

 

 Decide whether the statements are True (T) or False (F).

 

         1. A rocket uses the energy from wind to make power for the engine.             .................

         2. When the fuel burns, it creates gases that have great pressure.                     .................

         3. These gases come so fast but they have little power.                                    .................

         4. The rocket is pushed up because it overcome the force of gravity.              .................

         5. The rocket has two wings which help it fly.                                                  ................. 

1
27 tháng 8 2021

A rocket uses fuel to make power for the engine. The fuel is set on fire inside the rocket. As the fuel burns, it creates gases that have great pressure. These gases are blasted out of the rocket engines.

These gases all go out the bottom of the rocket engine where it is open. They come out so fast and with so much power that the rocket is pushed up. It is pushed up so hard that the rocket overcomes the force of gravity, which tries to keep everything on the ground. The force that pushes up against the front of the rocket is called thrust.

Unlike an airplane, a rocket does not use wings to help it fly. It just uses the power and force created by the burning fuel to make enough thrust.

 Decide whether the statements are True (T) or False (F).

1. A rocket uses the energy from wind to make power for the engine. ...........F......

2. When the fuel burns, it creates gases that have great pressure. ...........T......

3. These gases come so fast but they have little power. .......F..........

4. The rocket is pushed up because it overcome the force of gravity. .......T..........

5. The rocket has two wings which help it fly. ............F..... 

How does a rocket get to outer space? A rocket uses fuel to make power for the engine. The fuel is set on fire inside the rocket. As the fuel burns, it creates gases that have great pressure. These gases are blasted out of the rocket engines.These gases all go out the bottom of the rocket engine where it is open. They come out so fast and with so much power that the rocket is pushed up. It is pushed up so hard that the rocket overcomes the force of gravity, which tries to keep everything on...
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How does a rocket get to outer space?

A rocket uses fuel to make power for the engine. The fuel is set on fire inside the rocket. As the fuel burns, it creates gases that have great pressure. These gases are blasted out of the rocket engines.These gases all go out the bottom of the rocket engine where it is open. They come out so fast and with so much power that the rocket is pushed up. It is pushed up so hard that the rocket overcomes the force of gravity, which tries to keep everything on the ground. The force that pushes up against the front of the rocket is called thrust. Unlike an airplane, a rocket does not use wings to help it fly. It just uses the power and force created by the burning fuel to make enough thrust.

1. Where is the fuel set on fire?

2. How do the gases come out to make the rocket be pushed up?

3. What does the force of gravity try to do?

4. What is thrust?

5. What does an airplane use to help it fly?

1
14 tháng 5 2018

How does a rocket get to outer space?

A rocket uses fuel to make power for the engine. The fuel is set on fire inside the rocket. As the fuel burns, it creates gases that have great pressure. These gases are blasted out of the rocket engines.These gases all go out the bottom of the rocket engine where it is open. They come out so fast and with so much power that the rocket is pushed up. It is pushed up so hard that the rocket overcomes the force of gravity, which tries to keep everything on the ground. The force that pushes up against the front of the rocket is called thrust. Unlike an airplane, a rocket does not use wings to help it fly. It just uses the power and force created by the burning fuel to make enough thrust.

1. Where is the fuel set on fire?

=> The fuel is set on fire inside the rocket

2. How do the gases come out to make the rocket be pushed up?

=> They come out so fast and with so much power that the rocket is pushed up

3. What does the force of gravity try to do?

=> The force of gravity tries to keep everything on the ground.

4. What is thrust?

=> The force that pushes up against the front of the rocket is called thrust

5. What does an airplane use to help it fly?

=> It just uses the power and force created by the burning fuel to make enough thrust.

Part II. Read the passage and answer the following questions. (1 pt)How does a rocket get to outer space?A rocket uses fuel to make power for the engine. The fuel is set on fire inside the rocket. As the fuel burns, it creates gases that have great pressure. These gases are blasted out of the rocket engines.These gases all go out the bottom of the rocket engine where it is open. They come out so fast and with so much power that the rocket is pushed up. It is pushed up so hard that the rocket...
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Part II. Read the passage and answer the following questions. (1 pt)

How does a rocket get to outer space?

A rocket uses fuel to make power for the engine. The fuel is set on fire inside the rocket. As the fuel burns, it creates gases that have great pressure. These gases are blasted out of the rocket engines.

These gases all go out the bottom of the rocket engine where it is open. They come out so fast and with so much power that the rocket is pushed up. It is pushed up so hard that the rocket overcomes the force of gravity, which tries to keep everything on the ground. The force that pushes up against the front of the rocket is called thrust.

Unlike an airplane, a rocket does not use wings to help it fly. It just uses the power and force created by the burning fuel to make enough thrust.

1. Where is the fuel set on fire?       

2. How do the gases come out to push up the rocket?

3. What is the force that pushes up against the front of the rocket called?

4. What does a rocket use to help it fly?

2
25 tháng 7 2021

1. Where is the fuel set on fire?

=> The fuel is set on fire inside the rocket

2. How do the gases come out to make the rocket be pushed up?

=> They come out so fast and with so much power that the rocket is pushed up

3. What does the force of gravity try to do?

=> The force of gravity tries to keep everything on the ground.

4. What does an airplane use to help it fly?

=> It just uses the power and force created by the burning fuel to make enough thrust.

25 tháng 7 2021

1. Where is the fuel set on fire?

=> The fuel is set on fire inside the rocket

2. How do the gases come out to make the rocket be pushed up?

=> They come out so fast and with so much power that the rocket is pushed up

3. What does the force of gravity try to do?

=> The force of gravity tries to keep everything on the ground.

4. What does an airplane use to help it fly?

=> It just uses the power and force created by the burning fuel to make enough

Good luck.

Part II. Read the passage and answer the following questions. (1 pt)How does a rocket get to outer space?A rocket uses fuel to make power for the engine. The fuel is set on fire inside the rocket. As the fuel burns, it creates gases that have great pressure. These gases are blasted out of the rocket engines.These gases all go out the bottom of the rocket engine where it is open. They come out so fast and with so much power that the rocket is pushed up. It is pushed up so hard that the rocket...
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Part II. Read the passage and answer the following questions. (1 pt)

How does a rocket get to outer space?

A rocket uses fuel to make power for the engine. The fuel is set on fire inside the rocket. As the fuel burns, it creates gases that have great pressure. These gases are blasted out of the rocket engines.

These gases all go out the bottom of the rocket engine where it is open. They come out so fast and with so much power that the rocket is pushed up. It is pushed up so hard that the rocket overcomes the force of gravity, which tries to keep everything on the ground. The force that pushes up against the front of the rocket is called thrust.

Unlike an airplane, a rocket does not use wings to help it fly. It just uses the power and force created by the burning fuel to make enough thrust.

1. Where is the fuel set on fire?

2. How do the gases come out to push up the rocket? 

3. What is the force that pushes up against the front of the rocket called?

4. What does a rocket use to help it fly?

1
30 tháng 7 2021

Part II. Read the passage and answer the following questions. (1 pt)

How does a rocket get to outer space?

A rocket uses fuel to make power for the engine. The fuel is set on fire inside the rocket. As the fuel burns, it creates gases that have great pressure. These gases are blasted out of the rocket engines.

These gases all go out the bottom of the rocket engine where it is open. They come out so fast and with so much power that the rocket is pushed up. It is pushed up so hard that the rocket overcomes the force of gravity, which tries to keep everything on the ground. The force that pushes up against the front of the rocket is called thrust.

Unlike an airplane, a rocket does not use wings to help it fly. It just uses the power and force created by the burning fuel to make enough thrust.

1. Where is the fuel set on fire?

-> The fuel is set on fire inside the rocket.

2. How do the gases come out to push up the rocket? 

-> The gases come out so fast and with so much power that the rocket is pushed up.

3. What is the force that pushes up against the front of the rocket called?

-> The force that pushes up against the front of the rocket is called thrust.

4. What does a rocket use to help it fly?

-> It just uses the power and force created by the burning fuel to make enough thrust to help it fly.

The astronauts could not have reached the moon without the invention of rockets. We live in the age of rockets, but do you know that rockets are not a modern (1) _____ ? For centuries, rockets were used to entertain people. The Chinese used rockets (2) ______ fireworks. In the 13th century, rockets were first used in war. The Mongols used rockets to attack a Chinese city in 1232. These early rockets could not (3) ________very far. However, in 1885 a Russian scientist discovered a better...
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The astronauts could not have reached the moon without the invention of rockets. We live in the age of rockets, but do you know that rockets are not a modern

(1) _____ ? For centuries, rockets were used to entertain people. The Chinese used

rockets (2) ______ fireworks. In the 13th century, rockets were first used in war. The

Mongols used rockets to attack a Chinese city in 1232. These early rockets could not

(3) ________very far. However, in 1885 a Russian scientist discovered a better fuel for rockets. This liquid fuel gave rockets much more power. Then in 1919 a new age of rockets began. In that year an American scientist, Robert Goddard, said that it was

(4 )______ to send a rocket to the moon! Goddard launched his first liquid-fuelled rocket

in 1923. It flew 184 feet. Almost 12 years later, he sent a rocket 7,500 feet into the

air in 1935. Russian rockets sent the first (5) ______ into orbit in 1957. Just 12 years

later the first man walked on the moon – thanks to rockets! Where will rockets take us next?

0
Read the passage carefully, and decide whether the sentences are True or False Our school has a model club. The members of the club try to make water rockets. The students taking part in the club love discovering new things  and learning science subjects. A water rocket doesn't cost you much. You can use the things you have used such as empty bottles, old types of bicycles. The model has two main parts : the base and the rocket.  The pump in the base is made up of water pipes and it can...
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Read the passage carefully, and decide whether the sentences are True or False 

Our school has a model club. The members of the club try to make water rockets. The students taking part in the club love discovering new things  and learning science subjects. A water rocket doesn't cost you much. You can use the things you have used such as empty bottles, old types of bicycles. The model has two main parts : the base and the rocket.  The pump in the base is made up of water pipes and it can increase the pressure of water. The rocket made from empty bottles should have blades in its tail and a pointed head. These parts help the water go in the correct path as the membershave planned. When we use the pump to incease the pressure of water, the rocket will take off and fly into the air. our school club has just won the first prize on making water rockets.

1. The members of the model club have a love of science.

2. You can use old things to make water rockets.

3. it is expensive. to make water rockets.

4. The high pressure of water can make the models fly.

5. We cannot control the water rockets at all. 

2
3 tháng 9 2016

 

Read the passage carefully, and decide whether the sentences are True or False 

Our school has a model club. The members of the club try to make water rockets. The students taking part in the club love discovering new things  and learning science subjects. A water rocket doesn't cost you much. You can use the things you have used such as empty bottles, old types of bicycles. The model has two main parts : the base and the rocket.  The pump in the base is made up of water pipes and it can increase the pressure of water. The rocket made from empty bottles should have blades in its tail and a pointed head. These parts help the water go in the correct path as the membershave planned. When we use the pump to incease the pressure of water, the rocket will take off and fly into the air. our school club has just won the first prize on making water rockets.

1. The members of the model club have a love of science.

=> T

2. You can use old things to make water rockets.

=> T

3. it is expensive. to make water rockets.

=> F

4. The high pressure of water can make the models fly.

=> F

5. We cannot control the water rockets at all. 

=> T

3 tháng 9 2016

Hình như đúng hết

I. Find the word which has a different sound in the part underlined. 1. A. dear B. fear C. hear D. heart 2. A. stupid B. studio C. study D. student 3. A. brother B. thick C. they D. that 4. A. machine B. parachute C. champagne D. cheer 5. A. doctor B. hospital C. pollution D. tomorrow 6. A. space B. pack C. safe D. make 7. A. look B. scooter C. moon D. food 8. A. button B. funny C. success D. function 9. A. mean B. pleasant C. easy D. heat 10. A. popular B. flop C. hover D....
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I. Find the word which has a different sound in the part underlined.

1. A. dear B. fear C. hear D. heart

2. A. stupid B. studio C. study D. student

3. A. brother B. thick C. they D. that

4. A. machine B. parachute C. champagne D. cheer

5. A. doctor B. hospital C. pollution D. tomorrow

6. A. space B. pack C. safe D. make

7. A. look B. scooter C. moon D. food

8. A. button B. funny C. success D. function

9. A. mean B. pleasant C. easy D. heat

10. A. popular B. flop C. hover D. programme

II. Put the verb in brackets in the correct tense form.

1. What (you/do)………………………..when you graduate from university ?

2. Next week we (have)……………………..many kinds of examinations. It (be)……………..a very busy week, I think.

3. In the future, most of Vietnamese people (be able)…………………(speak)…………….English well.

4. We hope the new Director (find)…………………………more jobs for his employees.

5. Nam is a hard-working student. He (pass)……………………..the exam easily this year.

III. Find a mistake in the four underlined parts of each sentence and correct it.

1. My jet pack is on the ground and her is on the table.

2. I think more people will be using skycycling tubes in the future.

3. This is Mr and Mrs Evers’ house and those are theirs children.

4. My brother will pedal his monowheel to work at this time next week.

5. Will we traveling in driverless and high-speed cars in the future?

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

1. Tom rode his bike ………………………..and had an accident. (CARE)

2. We couldn’t see the airplane because it ……………………………behind the cloud. (APPEAR)

3. We are talking about the real………………………..of flying car. (EXIST)

4. I don’t think it will come true soon; however, your idea is really…………………..(IMMAGINE)

5. Thomas Edison is one of the greatest……………………………..in history. (INVENT)

6. The hover scooter is our new…………………………..(CREAT)

7. I like traveling by motorbike, but it is………………………..in bad weather. (PLEASE)

8. SSS is a sky…………………….system; it’ll stop everyone from crashing. (SAFE)

9. Bob feels very tired after two continuous nights of………………………..(SLEEP)

10. Many streets will be…………………………..at the beginning of next year. (WIDE)

V. Choose the best one which fits the space to complete the sentence.

1. This is……………………sister. That’s…………………..(his, my)

2. ……………..pen is red……………………..is blue. (Hers, Your)

3. They aren’t…………………….keys. They’re……………………..(theirs, our)

4. It isn’t……………………..hat. It’s…………………….(mine, her)

5. …………………..books are here. ……………………..are there. (Ours, Their?

6. These are………………….shoes. Those are………………………(your, his)

VI. Choose the best option A, B, C or D to complete the sentence.

1. You can use a jet pack to……………….anywhere easily.

A. drive B. sail C. ride D. fly

2. The driver pulls the handle of the Segway to go back or…………………it to go forward.

A. pushes B. brakes C. circles D. turns

3. A……………..makes you disappear and then reappear in another place seconds later.

A. scooter B. monowheel C. telephone D. spaceship

4. The cars which are generated by solar energy are called……………..cars.

A. solar-wasted B. solar-powered C. solar-friendly D. solar-daily

5. The driver sits inside the wheel of the monowheel and………………to go forward.

A. pedals B. floats C. presses D. hovers

6. An aircraft without a human pilot abroad is called a………………aircraft.

A. pilotless B. single-pilot C. double-piloted D. three-piloted

7. The black hover scooter is Tom’s;……………is red.

A. I B. me C. my D. mine

8. This is……………smart vehicle;…………..is over there.

A. her-our B. her-ours C. hers-ours D. hers-our

9. I think means of transport in the future………………petrol.

A. aren’t using B. aren’t going to use C. won’t use D. won’t be using

10. At this time next month, we……………the new flying boat.

A. are testing B. are going to test C. will test D. will be testing

VII. Read the following passage and answer the questions below.

How does a rocket get to outer space?

A rocket uses fuel to make power for the engine. The fuel is set on fire inside the rocket. As the fuel burns, it creates gases that have great pressure. These gases are blasted out of the rocket engines.

These gases all go out the bottom of the rocket engine where it is open. They come out so fast and with so much power that the rocket is pushed up. It is pushed up so hard that the rocket overcomes the force of gravity, which tries to keep everything on the ground. The force that pushes up against the front of the rocket is called thrust.

Unlike an airplane, a rocket does not use wings to help it fly. It just uses the power and force created by the burning fuel to make enough thrust.

1. Where is the fuel set on fire?

……………………………………………………………………………..

2. How do the gases come out to make the rocket be pushed up?

……………………………………………………………………………..

3. What does the force of gravity try to do?

……………………………………………………………………………..

4. What is thrust?

……………………………………………………………………………..

5. What does an airplane use to help it fly?

……………………………………………………………………………..

VIII. Read and complete the sentences. Use the words in the box. There is one example.

ease to cycle easily miniature

from transport bullock cart cars invention

About hundreds of years ago there was no fastest means of transport and people had to walk on a

(1)………………………….or horseback. Today, we are with number of means of transport and can reach any part of the world with (2)……………………… First of all, with the invention of the wheels came the (3)…………………….which is still very a popular form of transport. It is an eco-friendly vehicle. The first (4)…………………………that made transport truly fast was the invention of the steam engine. This led to the railways. And further, the petrol engine soon changed the whole scene by making the motor car possible. Today, of course we have motor cycles, motor cars and diesel run trucks. The bulkiest of material can easily be transported (5)…………………….one end of the country (6)………… other end by means of trucks or by railways. We can easily travel to our place of work or go on a holiday. (7)……………………….have emerged as the most widely accepted form of (8)………………. Today, they have been made very comfortable to run air-conditioner, radio and tape-recorder and even a (9)…………………..television. Five or six people can (10)………………..travel with comfort….

giúp mình vứi :)

1
8 tháng 4 2018

I. Find the word which has a different sound in the part underlined.

1. A. dear B. fear C. hear D. heart

2. A. stupid B. studio C. study D. student

3. A. brother B. thick C. they D. that

4. A. machine B. parachute C. champagne D. cheer

5. A. doctor B. hospital C. pollution D. tomorrow

6. A. space B. pack C. safe D. make

7. A. look B. scooter C. moon D. food

8. A. button B. funny C. success D. function

9. A. mean B. pleasant C. easy D. heat

10. A. popular B. flop C. hover D. programme

II. Put the verb in brackets in the correct tense form.

1. What will you(do) do when you graduate from the university?

2. Next week we (have) are going to have many kinds of examinations. It (be) will a very busy week, I think.

3. In the future, most of Vietnamese people will be able (be able) (speak) to speak English well.

4. We hope the new Director (find)…will find………………………more jobs for his employees.

5. Nam is a hard-working student. He (pass)……will pass………………..the exam easily this year.

8 tháng 4 2018

câu 2 bài 2 thì tương lai mà bạn

Read the passage carefully, and decide whether the sentences are True and False Our school ha a model club. The members of the club try to make water rockets. The student taking part in the club love discovering new things and learning science subjects. A water rocket doesn't cost you much. You can use the things you have used such as empty bottles, old tyres of bicycles. The model has two main parts: the base and the rocket. The pump in the base is made up of water pipes and it can increase...
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Read the passage carefully, and decide whether the sentences are True and False

Our school ha a model club. The members of the club try to make water rockets. The student taking part in the club love discovering new things and learning science subjects. A water rocket doesn't cost you much. You can use the things you have used such as empty bottles, old tyres of bicycles. The model has two main parts: the base and the rocket. The pump in the base is made up of water pipes and it can increase the pressure of water. The rocket made from empty bottles should have blades in its tail anf a pointed head. These parts help the water go in the correct path as the members have planned. When we use the pump to increase the pressure of water, the rocket will take off and fly into the air. Our school club has just wom the first prize in making water rockets.

1. The members of th model club have a love of science

.......

2. You can use old things to make water rockets .........

3. It is expensive to make water rockets. ...........

4. The high pressure of water can make the models fly. ......

5. We cannot control the water rockets at all. ...........

1
7 tháng 10 2017

Read the passage carefully, and decide whether the sentences are True and False

Our school ha a model club. The members of the club try to make water rockets. The student taking part in the club love discovering new things and learning science subjects. A water rocket doesn't cost you much. You can use the things you have used such as empty bottles, old tyres of bicycles. The model has two main parts: the base and the rocket. The pump in the base is made up of water pipes and it can increase the pressure of water. The rocket made from empty bottles should have blades in its tail anf a pointed head. These parts help the water go in the correct path as the members have planned. When we use the pump to increase the pressure of water, the rocket will take off and fly into the air. Our school club has just wom the first prize in making water rockets.

1. The members of th model club have a love of science

....T...

2. You can use old things to make water rockets .....T....

3. It is expensive to make water rockets. .....F......

4. The high pressure of water can make the models fly. ...F...

5. We cannot control the water rockets at all. ......T.....

13 tháng 7 2019

sai rồi bn ơi

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”....
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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.

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

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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.