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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 35 to 44.Bird migration is one of the most interesting yet least understood natural phenomena. Every fall birds from northern latitudes fly in groups to the warmer southern latitudes and then return north in the spring. Scientists agree on the main reasons for migration: to follow the food supply and to avoid harsh climate conditions. For example, insects disappear during the cold months, prompting insect-dependent birds to fly south to warm areas where insects breed. No similar consensus has emerged, however, about how birds are able to navigate. Despite many recent experiments, bird experts still do not know how birds arrive at the same destinations every year and then find their way back home in the spring.Some have suggested that birds find their way by following landmarks, such as rivers and mountain ranges. Experiments have confirmed that some species do follow such topographic features. But that method cannot explain how some birds travel at night. Other studies show that some nocturnal birds navigate by the stars. But that explanation cannot explain daytime migration or travel when the skies are cloudy.The most popular explanation currently is that birds are guided by Earth’s magnetic poles. The mechanism by which that works has not yet been proved. One theory points to the fact that some birds’ contain magnetite, a naturally occurring magnetic compound consisting of iron oxide. Magnetite has been found in many animals, including birds. With magnets embedded in their brains, birds would be able to sense the magnetic fields of the North and South Poles.A recent experiment with homing pigeons provided some evidence that magnetite does play a crucial role in migration. Homing pigeons are known to have the ability to return to their homes after being taken hundreds of miles away. Researchers found that they could train homing pigeons to recognize changes in a magnetic field. When a surrounding magnetic field was normal, the birds would gather at one end of a cage. But when the field’s polarity was altered, they hopped to the other end, suggesting that they were directing and responding to changes in the magnetic field.Another theory has been offered to explain this sensitivity to magnetic poles, a theory that draws upon quantum mechanics, which is the study of how particles move inside an atom. It relies on the fact that electrons come in pairs that orbits the nucleus of an atom. The two electrons spin in opposite directions, creating two magnets that neutralize each other. But when molecules split and react with other molecules to form compounds, the electrons pairs may no longer spin in opposite directions. Instead, they may repel each other, as when two north ends of magnets are pressed together. The electrons struggle to change direction in order to achieve a stable state in which the two electrons again neutralize each other, giving off no magnetic field. The word “phenomena” in the passage is closest in meaning to
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 35 to 44.Bird migration is one of the most interesting yet least understood natural phenomena. Every fall birds from northern latitudes fly in groups to the warmer southern latitudes and then return north in the spring. Scientists agree on the main reasons for migration: to follow the food supply and to avoid harsh climate conditions. For example, insects disappear during the cold months, prompting insect-dependent birds to fly south to warm areas where insects breed. No similar consensus has emerged, however, about how birds are able to navigate. Despite many recent experiments, bird experts still do not know how birds arrive at the same destinations every year and then find their way back home in the spring.Some have suggested that birds find their way by following landmarks, such as rivers and mountain ranges. Experiments have confirmed that some species do follow such topographic features. But that method cannot explain how some birds travel at night. Other studies show that some nocturnal birds navigate by the stars. But that explanation cannot explain daytime migration or travel when the skies are cloudy.The most popular explanation currently is that birds are guided by Earth’s magnetic poles. The mechanism by which that works has not yet been proved. One theory points to the fact that some birds’ contain magnetite, a naturally occurring magnetic compound consisting of iron oxide. Magnetite has been found in many animals, including birds. With magnets embedded in their brains, birds would be able to sense the magnetic fields of the North and South Poles.A recent experiment with homing pigeons provided some evidence that magnetite does play a crucial role in migration. Homing pigeons are known to have the ability to return to their homes after being taken hundreds of miles away. Researchers found that they could train homing pigeons to recognize changes in a magnetic field. When a surrounding magnetic field was normal, the birds would gather at one end of a cage. But when the field’s polarity was altered, they hopped to the other end, suggesting that they were directing and responding to changes in the magnetic field.Another theory has been offered to explain this sensitivity to magnetic poles, a theory that draws upon quantum mechanics, which is the study of how particles move inside an atom. It relies on the fact that electrons come in pairs that orbits the nucleus of an atom. The two electrons spin in opposite directions, creating two magnets that neutralize each other. But when molecules split and react with other molecules to form compounds, the electrons pairs may no longer spin in opposite directions. Instead, they may repel each other, as when two north ends of magnets are pressed together. The electrons struggle to change direction in order to achieve a stable state in which the two electrons again neutralize each other, giving off no magnetic field. According to paragraph 1, insects influence bird migration in which of the following ways?
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 question 33 to 42.Artificial flowers are used for scientific as well as for decorative purposes. They are made from a variety of materials, such as wax and glass, so skillfully that they can scarcely be distinguished from natural flowers. In making such models, painstaking skill and artistry are called for, as well as thorough knowledge of plant structure. The collection of glass flowers in the Botanical Museum of Harvard University is the most famous in the North America and is widely known throughout the scientific world. In all, there are several thousand models in colored glass, the work of two artist-naturalist, Leopold Blaschka and his son Rudolph.The intention was to have the collection represent at least one member of each flower family native to the United States. Although it was never completed, it contains more than seven hundred species representing 164 families of flowering plants, a group of fruits showing the effect of fungus diseases, and thousands of flowers parts and magnified details. Every detail of these is accurately reproduced in color and structure. The models are kept in locked cases as they are too valuable and fragile for classroom use.All of the following are characteristics of the collection of glass flowers in the Botanical Museum of Harvard University EXCEPT ________?
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 question 33 to 42.Artificial flowers are used for scientific as well as for decorative purposes. They are made from a variety of materials, such as wax and glass, so skillfully that they can scarcely be distinguished from natural flowers. In making such models, painstaking skill and artistry are called for, as well as thorough knowledge of plant structure. The collection of glass flowers in the Botanical Museum of Harvard University is the most famous in the North America and is widely known throughout the scientific world. In all, there are several thousand models in colored glass, the work of two artist-naturalist, Leopold Blaschka and his son Rudolph.The intention was to have the collection represent at least one member of each flower family native to the United States. Although it was never completed, it contains more than seven hundred species representing 164 families of flowering plants, a group of fruits showing the effect of fungus diseases, and thousands of flowers parts and magnified details. Every detail of these is accurately reproduced in color and structure. The models are kept in locked cases as they are too valuable and fragile for classroom use.Which of the following is NOT mentioned as a requirement to make artificial flowers?
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 question 33 to 42.Artificial flowers are used for scientific as well as for decorative purposes. They are made from a variety of materials, such as wax and glass, so skillfully that they can scarcely be distinguished from natural flowers. In making such models, painstaking skill and artistry are called for, as well as thorough knowledge of plant structure. The collection of glass flowers in the Botanical Museum of Harvard University is the most famous in the North America and is widely known throughout the scientific world. In all, there are several thousand models in colored glass, the work of two artist-naturalist, Leopold Blaschka and his son Rudolph.The intention was to have the collection represent at least one member of each flower family native to the United States. Although it was never completed, it contains more than seven hundred species representing 164 families of flowering plants, a group of fruits showing the effect of fungus diseases, and thousands of flowers parts and magnified details. Every detail of these is accurately reproduced in color and structure. The models are kept in locked cases as they are too valuable and fragile for classroom use.The word thorough in bold in paragraph 1 most probably means _________.
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 question 33 to 42.Artificial flowers are used for scientific as well as for decorative purposes. They are made from a variety of materials, such as wax and glass, so skillfully that they can scarcely be distinguished from natural flowers. In making such models, painstaking skill and artistry are called for, as well as thorough knowledge of plant structure. The collection of glass flowers in the Botanical Museum of Harvard University is the most famous in the North America and is widely known throughout the scientific world. In all, there are several thousand models in colored glass, the work of two artist-naturalist, Leopold Blaschka and his son Rudolph.The intention was to have the collection represent at least one member of each flower family native to the United States. Although it was never completed, it contains more than seven hundred species representing 164 families of flowering plants, a group of fruits showing the effect of fungus diseases, and thousands of flowers parts and magnified details. Every detail of these is accurately reproduced in color and structure. The models are kept in locked cases as they are too valuable and fragile for classroom use.The word fragile in bold in paragraph 2 most probably means __________.
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 question 33 to 42.Artificial flowers are used for scientific as well as for decorative purposes. They are made from a variety of materials, such as wax and glass, so skillfully that they can scarcely be distinguished from natural flowers. In making such models, painstaking skill and artistry are called for, as well as thorough knowledge of plant structure. The collection of glass flowers in the Botanical Museum of Harvard University is the most famous in the North America and is widely known throughout the scientific world. In all, there are several thousand models in colored glass, the work of two artist-naturalist, Leopold Blaschka and his son Rudolph.The intention was to have the collection represent at least one member of each flower family native to the United States. Although it was never completed, it contains more than seven hundred species representing 164 families of flowering plants, a group of fruits showing the effect of fungus diseases, and thousands of flowers parts and magnified details. Every detail of these is accurately reproduced in color and structure. The models are kept in locked cases as they are too valuable and fragile for classroom use.Which of the following statements is TRUE of the flowers at Harvard University?
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 question 33 to 42.Artificial flowers are used for scientific as well as for decorative purposes. They are made from a variety of materials, such as wax and glass, so skillfully that they can scarcely be distinguished from natural flowers. In making such models, painstaking skill and artistry are called for, as well as thorough knowledge of plant structure. The collection of glass flowers in the Botanical Museum of Harvard University is the most famous in the North America and is widely known throughout the scientific world. In all, there are several thousand models in colored glass, the work of two artist-naturalist, Leopold Blaschka and his son Rudolph.The intention was to have the collection represent at least one member of each flower family native to the United States. Although it was never completed, it contains more than seven hundred species representing 164 families of flowering plants, a group of fruits showing the effect of fungus diseases, and thousands of flowers parts and magnified details. Every detail of these is accurately reproduced in color and structure. The models are kept in locked cases as they are too valuable and fragile for classroom use.Which of the following is NOT included in the display at the Botanical Museum of Harvard University?
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 question 33 to 42.Artificial flowers are used for scientific as well as for decorative purposes. They are made from a variety of materials, such as wax and glass, so skillfully that they can scarcely be distinguished from natural flowers. In making such models, painstaking skill and artistry are called for, as well as thorough knowledge of plant structure. The collection of glass flowers in the Botanical Museum of Harvard University is the most famous in the North America and is widely known throughout the scientific world. In all, there are several thousand models in colored glass, the work of two artist-naturalist, Leopold Blaschka and his son Rudolph.The intention was to have the collection represent at least one member of each flower family native to the United States. Although it was never completed, it contains more than seven hundred species representing 164 families of flowering plants, a group of fruits showing the effect of fungus diseases, and thousands of flowers parts and magnified details. Every detail of these is accurately reproduced in color and structure. The models are kept in locked cases as they are too valuable and fragile for classroom use.In paragraph 2. The word it in bold refers to which of the following phrases?
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 question 33 to 42.Artificial flowers are used for scientific as well as for decorative purposes. They are made from a variety of materials, such as wax and glass, so skillfully that they can scarcely be distinguished from natural flowers. In making such models, painstaking skill and artistry are called for, as well as thorough knowledge of plant structure. The collection of glass flowers in the Botanical Museum of Harvard University is the most famous in the North America and is widely known throughout the scientific world. In all, there are several thousand models in colored glass, the work of two artist-naturalist, Leopold Blaschka and his son Rudolph.The intention was to have the collection represent at least one member of each flower family native to the United States. Although it was never completed, it contains more than seven hundred species representing 164 families of flowering plants, a group of fruits showing the effect of fungus diseases, and thousands of flowers parts and magnified details. Every detail of these is accurately reproduced in color and structure. The models are kept in locked cases as they are too valuable and fragile for classroom use.It can be inferred from the passage that the goal of Leopold and Rudolph Blaschka was to __________.
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 question 33 to 42.Artificial flowers are used for scientific as well as for decorative purposes. They are made from a variety of materials, such as wax and glass, so skillfully that they can scarcely be distinguished from natural flowers. In making such models, painstaking skill and artistry are called for, as well as thorough knowledge of plant structure. The collection of glass flowers in the Botanical Museum of Harvard University is the most famous in the North America and is widely known throughout the scientific world. In all, there are several thousand models in colored glass, the work of two artist-naturalist, Leopold Blaschka and his son Rudolph.The intention was to have the collection represent at least one member of each flower family native to the United States. Although it was never completed, it contains more than seven hundred species representing 164 families of flowering plants, a group of fruits showing the effect of fungus diseases, and thousands of flowers parts and magnified details. Every detail of these is accurately reproduced in color and structure. The models are kept in locked cases as they are too valuable and fragile for classroom use.Which of the following statements about Leopold and Rudolph Blaschka is TRUE?
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 question 33 to 42.Artificial flowers are used for scientific as well as for decorative purposes. They are made from a variety of materials, such as wax and glass, so skillfully that they can scarcely be distinguished from natural flowers. In making such models, painstaking skill and artistry are called for, as well as thorough knowledge of plant structure. The collection of glass flowers in the Botanical Museum of Harvard University is the most famous in the North America and is widely known throughout the scientific world. In all, there are several thousand models in colored glass, the work of two artist-naturalist, Leopold Blaschka and his son Rudolph.The intention was to have the collection represent at least one member of each flower family native to the United States. Although it was never completed, it contains more than seven hundred species representing 164 families of flowering plants, a group of fruits showing the effect of fungus diseases, and thousands of flowers parts and magnified details. Every detail of these is accurately reproduced in color and structure. The models are kept in locked cases as they are too valuable and fragile for classroom use.Which of the following statements is the best title for the passage
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 .Millions of people are using cellphones today. In many places, it is actually considered unusual not to use one. In many countries, cellphones are very popular with young people. They find that the phones are more than a means of communication - having a mobile phone shows that they are cool and connected. The explosion in mobile phone use around the world has made some health professionals worried. Some doctors are concerned that in the future many people may suffer health problems from the use of mobile phones. In England, there has been a serious debate about this issue. Mobile phone companies are worried about the negative publicity of such ideas. They say that there is no proof that mobile phones are bad for your health. On the other hand, medical studies have shown changes in the brain cells of some people who use mobile phones. Signs of change in the tissues of the brain and head can be detected with modern scanning equipment. In one case, a traveling salesman had to retire at young age because of serious memory loss. He couldn't remember even simple tasks. He would often forget the name of his own son. This man used to talk on his mobile phone for about six hours a day, every day of his working week, for a couple of years. His family doctor blamed his mobile phone use, but his employer's doctor didn't agree.What is it that makes mobile phones potentially harmful? The answer is radiation. High-tech machines can detect very small amounts of radiation from mobile phones. Mobile phone companies agree that there is some radiation, but they say the amount is too small to worry about. As the discussion about their safety continues, it appears that it's best to use mobile phones less often. Use your regular phone if you want to talk for a long time. Use your mobile phone only when you really need it. Mobile phones can be very useful and convenient, especially in emergencies. In the future, mobile phones may have a warning label that says they are bad for your health. So for now, it's wise not to use your mobile phone too often.According to the passage, what makes mobile phones potentially harmful is _____.
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the blanks from 16 to 25.Over the last few years, the use of the Internet has increased dramatically in French schools, offices, and homes and this trend continues to grow. Who could have imagined, even in the last decade, that we would be able to (16) __________ our friends, colleagues and clients around the world simply through the (17) __________ of a mouse and a modem? There is no doubt, like any invention, that the Internet can be used for good or bad but it is here to stay and has (18) __________ the way we communicate.In the world of business, no corporation can be competitive unless it (19) __________ access to the Internet. It has become essential to advertise your product and service in this way and an increasing number of companies are using this opportunity to reach a greater number of (20) __________ consumers. Indeed, the bigger the website is, (21) __________ professional the company seems to be.Similarly in education, the opportunities that the Internet can (22) __________ are vast. More and more students are (23) __________ on the Internet for their research; for instance, a physics undergraduate in Paris can download information from a university library in the United States in minutes. From the latest research in scientific and linguistic fields to new theories in psychology and history, all this may be published on the world-wide web.What will be the future for the Internet in France? It has been (24) __________ that 60% of homes and 50% business will have access to the Internet within five years. Children, students and professionals will be able to (25) __________ and explore the world as they have never done before.Điền vào ô số 25
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the blanks from 16 to 25.Over the last few years, the use of the Internet has increased dramatically in French schools, offices, and homes and this trend continues to grow. Who could have imagined, even in the last decade, that we would be able to (16) __________ our friends, colleagues and clients around the world simply through the (17) __________ of a mouse and a modem? There is no doubt, like any invention, that the Internet can be used for good or bad but it is here to stay and has (18) __________ the way we communicate.In the world of business, no corporation can be competitive unless it (19) __________ access to the Internet. It has become essential to advertise your product and service in this way and an increasing number of companies are using this opportunity to reach a greater number of (20) __________ consumers. Indeed, the bigger the website is, (21) __________ professional the company seems to be.Similarly in education, the opportunities that the Internet can (22) __________ are vast. More and more students are (23) __________ on the Internet for their research; for instance, a physics undergraduate in Paris can download information from a university library in the United States in minutes. From the latest research in scientific and linguistic fields to new theories in psychology and history, all this may be published on the world-wide web.What will be the future for the Internet in France? It has been (24) __________ that 60% of homes and 50% business will have access to the Internet within five years. Children, students and professionals will be able to (25) __________ and explore the world as they have never done before.Điền vào ô số 24