Smog is a combination of smoke and fog It occurs when gases from bunt fuel mix with fogon the ground. When heat and sunlight get together with these gases, they form fine,dangerous particles in the air.

Smog occurs in big cities with a lot of traffic. Particularly, in the summertime, when it is veryhot, smog stays near the ground. It is dangerous to our breathing, and in smoggy areas, we can not see very well.

Smog was first discovered in Great Britain in the 19th century, during the beginning of theIndustrial Revolution. At that time, people used coal for heating and cooking. Factories alsoused coal to produce iron and steel. Smoke mixed with wet, foggy air and turned yellow. Thesmog often hung over cities for many days. It caused lung diseases and breathing problem. Thousands of people died in London every year.

Today, cities that have a large population and are located in hot, subtropical areas have thebiggest smog problems for example, Los Angeles, Mexico City and Cairo.

I. Where can smog possibly be found?

A. At a place where it is rainy

B. At a place where the traffic is heavy and the weather is foggy

C. Underground

D. In a city where many people smoke

2 In the first paragraph, the word fine is closest in meaning to

A.tiny

B.good

C. harmful

D. shiny

3. What will happen if smog stays close to the ground ?

A. It will disappear in a shot time.

B. It will make the sky cleaner.

C. It will harm our health and block our sight.

D. It will cause many storms.

4. What probably caused the smog in Britain at the beginning of the Industrial Revolution?

A. There were too many cars in the country.

B. The weather there was too foggy

C. Factories and people used coal as energy

D. People smoke a lot at that time.

5. In the third paragraph, the word it refers to.......

A. iron

C. steel

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 30 to 34.

Genetic modification of foods is not a new practice. It has been practiced for thousands of years under the name of "selective breeding". Animals and plants were chosen because they had traits that humans found useful. Some animals were larger and stronger than others, or they yielded more food, or they had some other trait that humans valued. Therefore, they were bred because of those traits. Individuals with those traits were brought together and allowed to breed in the hope that their offspring would have the same traits in greater measure.

Much the same thing was done with plants. To produce bigger or sweeter fruit, or grow more grain per unit of land, strains of plants were combined and recombined to produce hybrids, or crossbreeds that had the desired traits in the right combinations. All the while, however, biologists wondered: is there a more direct and versatile way to change the traits of plants and animals? Could we rewrite, so to speak, the heredity of organisms to make them serve our needs better?

In the 20th century, genetic modification made such changes possible at last. Now, it was possible to alter the genetic code without using the slow and uncertain process of selective breeding. It even became possible to blend plants and animals genetically: to insert animal genes into plants, for example, in order to give the plants a certain trait they ordinarily would lack, such as resistance to freezing. The result was a tremendous potential to change the very nature of biology.

The word "blend" in paragraph 3 mostly means ______.

A. combine

B. collect 

C. gather 

D. carry 

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 30 to 34.

Genetic modification of foods is not a new practice. It has been practiced for thousands of years under the name of "selective breeding". Animals and plants were chosen because they had traits that humans found useful. Some animals were larger and stronger than others, or they yielded more food, or they had some other trait that humans valued. Therefore, they were bred because of those traits. Individuals with those traits were brought together and allowed to breed in the hope that their offspring would have the same traits in greater measure.

Much the same thing was done with plants. To produce bigger or sweeter fruit, or grow more grain per unit of land, strains of plants were combined and recombined to produce hybrids, or crossbreeds that had the desired traits in the right combinations. All the while, however, biologists wondered: is there a more direct and versatile way to change the traits of plants and animals? Could we rewrite, so to speak, the heredity of organisms to make them serve our needs better?

In the 20th century, genetic modification made such changes possible at last. Now, it was possible to alter the genetic code without using the slow and uncertain process of selective breeding. It even became possible to blend plants and animals genetically: to insert animal genes into plants, for example, in order to give the plants a certain trait they ordinarily would lack, such as resistance to freezing. The result was a tremendous potential to change the very nature of biology

The word "blend" in paragraph 3 mostly means ______. 

A. combine 

B. collect 

C. gather 

D. carry 

Mark the letter A, B, C, or D to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.

Most of the Imperial Citadel of Thang Long was demolished in the early 20th century.

A. rebuilt    

B. pulled down     

C. put up    

D. pulled up

Đọc kỹ đoạn văn sau và rồi trả lới các câu hỏi bên dưới.

London has a population of about 7,500,000. It lies on the river Thames. From about 1800 until World War II, London was the biggest city in the world, but now, there are many cities which are much bigger.

London is famous for many things. Tourists come from all over the world to visit its historic buildings such as St. Paul's Cathedral, the Houses of Parliament, where you can see and hear the famous clock, Big Ben. They also come to visit its theatres, its museums and its many shops such as Harrods, where you can buy anything.

Like many big cities, London has problems with traffic and pollution. Over 1,000,000 people a day use the underground, but there are still many cars on the streets. The air isn't clean, but it is cleaner than it was 100 years ago. London is famous for its fog or "smog" which is a mixture of smoke and fog.

Questions:

76. How many people are there in London?

.................................................................................................................................................................

77. Is London the biggest city in the world?

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78. What is Harrods?

.................................................................................................................................................................

79. What is smog?

.................................................................................................................................................................

80. Wasn't London cleaner 100 years ago than it is now?

.................................................................................................................................................................

XII. Choose five activities from the list that you would like to do in a three-day visit to London. Then describe the activities in a full passage. 1. Visit the city's oldest royal palace - the Tower of London. Experience London Bridge. 2. Take a boat from Tower Hill heading west underneath Millennium Bridge, and past St Paul's Cathedral to London Eye pier. 3. Take the City Cruises boat west to the stunning Houses of Parliament. 4. Stop by Westminster Pier to visit Westminster Abbey. 5. Arrive at Windsor Castle, the official residence of the Queen of England. 6. Take a canal boat trip along the picturesque Regent's Canal to ZSL London Zoo. 7. Visit Wembley Stadium for real football experience. This is the schedule for my three-day visit to London. On the first day I.... Lưu ý : trong 7 câu chọn 4 câu để tả Giúp mik vs 10h 30 mik đi học rồi

Read the passage and choose the correct answer for each question
I often hear or read about “ natural disasters ” – the eruption of Mount St . Helen , a volcano in the state of Washington ; Hurricane Andrew in Florida ; the floods in the American Midwest ; terrible all over the world ; huge fires ; and so on and so on . But 11 never forget my first personal experience with the strangeness of nature – “ the London Killer Fog of 1952 . It began Thursday December 4 , when a high - pressure system ( warm air ) covered Southern England . With the freezing - cold air below , heavy fog formed . Pollution from factories , cars , and coal stoves mixed with the fog . The humidity was terrible high , there was no breeze at all . Traffic ( cars , trains , and boats ) stopped . People couldn ' t see , and some walked onto the railroad tracks or into the river . It was hard to breathe , and many people got sick . Finally , on Tuesday , December 9 , the wind came and the fog went away . But after that , even more people gọt sick . Many of them died . D . a tornado
1 . Which “ natural disaster ” isn ' t mentioned in the text ?
A . a volcano B . a flood C . a hurricane D. a tornado
2 . What is his unforgettable personal experience ?
A . the London killer B . the heavy fog in London in 1952 C . the strangeness of nature .D. a high - pressure system
3 . What didn ' t happen during the time of “ London Killer Fog ” ?
A . heavy rain B , humidity ? C . pollution D . heavy fog
4 . Why did the traffic stop?
A . Because of the rain . B . Because of the windy weather . C . Because of the humid weather . D . Because of the heavy fog . .