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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 36 to 42.     (1) Aging is the process of growing old. It occurs eventually in every living thing provided, of course, that an illness or accident does not kill it prematurely. The most familiar outward signs of aging may be seen in old people, such as the graying of the hair and the wrinkling of the skin. Signs of aging in a pet dog or cat include loss of playfulness and energy, a decline in hearing and eyesight, or even a slight graying of the coat. Plants age too, but the signs are much harder to detect.     (2) Most body parts grow bigger and stronger, and function more efficiently during childhood. They reach their peak at the time of maturity, or early adulthood. After that, they begin to decline. Bones, for example, gradually become lighter and more brittle. In the aged, the joints between the bones also become rigid and more inflexible. This can make moving very painful.     (3) All the major organs of the body show signs of aging. The brain, for example, works less efficiently, and even gets smaller in size. Thinking processes of all sorts are slowed down. Old people often have trouble in remembering recent events.     (4) One of the most serious changes of old age occurs in the arteries, the blood vessels that lead from the heart. They become thickened and constricted, allowing less blood to flow to the rest of body. This condition accounts, directly or indirectly, for many of the diseases of the aged. It may, for example, result in heart attack.     (5) Aging is not a uniform process. Different parts of the body wear out at different rates. There are great differences among people in their rate of aging. Even the cells of the body differ in the way they age. The majority of cells are capable of reproducing themselves many times during the course of a lifetime. Nerve cells and muscle fibers can never be replaced once they wear out.     (6) Gerontologists - scientists who study the process of aging - believe this wearing out of the body is controlled by a built-in biological time-clock. They are trying to discover how this clock works so that they can slow down the process. This could give man a longer life and a great number of productive years. All of the followings may be the outward signs of aging EXCEPT _____.

Xem chi tiết 0.9 K lượt xem 5 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.Most traditional human life in deserts is nomadic. It (35) ________ in hot deserts on finding water, and on following infrequent rains to (36) ________ grazing for livestock. In cold deserts, it depends on finding good hunting and fishing grounds, on sheltering from blizzards and winter (37) ________, and on storing enough food for winter. Permanent settlement in both kinds of deserts requires permanent water, food sources and adequate shelter, or the technology and energy sources to (38) ________ it.Many deserts are flat and featureless, lacking landmarks, or composed of repeating landforms such as sand (39) ________ or the jumbled ice-fields of glaciers. Advanced skills or devices are required to navigate through such landscapes and (40) ________ travelers may die when supplies run (41) ________ after becoming lost. In addition, sandstorms or blizzards may cause disorientation in severely-reduced visibility.The (42) ________ represented by wild animals in deserts has featured in explorers' accounts but does not cause higher (43) ________ of death than in other environments such as rainforests or savanna woodland, and generally does not affect human distribution. Defense against polar bears may be advisable in some areas of the Arctic. Precautions against snakes and scorpions in choosing (44) ________ at which to camp in some hot deserts should be taken.Điền câu 42

Xem chi tiết 1.8 K lượt xem 5 năm trước

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 43 to 50.Most journeys in Britain and the US are made by road. Some of these are made on public transport but most are by private car. In Britain many people rely on their cars for daily local activities, e.g. getting to work, doing the shopping, and visiting friends. People living in urban areas may use buses, trains or, in London, the Underground, to get to city centres, mainly because traffic is often heavy and it is difficult to find anywhere to park a car. Some places in the country may have a bus only two or three times a week so people living there have no choice but to rely on their cars.In the US large cities have good public transportation systems. The El railroad in Chicago and the underground systems of New York, Boston, San Francisco and Washington, DC are heavily used. Elsewhere, most Americans prefer to use their cars. Families often have two cars and, outside major cities, have to drive fairly long distances to schools, offices, shops, banks, etc. Many college and even high-school students have their own cars.Long-distance travel in Britain is also mainly by road, though railways link most towns and cities. Most places are linked by motorways or other fast roads and many people prefer to drive at their own convenience rather than use a train, even though they may get stuck in a traffic jam. Long-distance coach/bus services are usually a cheaper alternative to trains, but they take longer and may be less comfortable. Some long-distance travel, especially that undertaken for business reasons, may be by air. There are regular flights between regional airports, as well as to and from London. A lot of freight is also distributed by road, though heavier items and raw materials often go by rail.In the US much long-distance travel is by air. America has two main long-distance bus companies, Greyhound and Trailways. Amtrak, the national network, provides rail services for passengers. Private railway companies such as Union Pacific now carry only freight, though in fact over 70% of freight goes by road.The main problems associated with road transport in both Britain and the US are traffic congestion and pollution. It is predicted that the number of cars on British roads will increase by a third within a few years, making both these problems worse. The British government would like more people to use public transport, but so far they have had little success in persuading people to give up their cars or to share rides with neighbours. Most people say that public transport is simply not good enough. Americans too have resisted government requests to share cars because it is less convenient and restricts their freedom. Petrol/gasoline is relatively cheap in the US and outside the major cities public transport is bad, so they see no reason to use their cars less.(Extracted from Oxford Guide to British and American Culture, Oxford University Press, 2000)Which of the following is NOT true according to the passage? 

Xem chi tiết 460 lượt xem 5 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.Most traditional human life in deserts is nomadic. It (35) ________ in hot deserts on finding water, and on following infrequent rains to (36) ________ grazing for livestock. In cold deserts, it depends on finding good hunting and fishing grounds, on sheltering from blizzards and winter (37) ________, and on storing enough food for winter. Permanent settlement in both kinds of deserts requires permanent water, food sources and adequate shelter, or the technology and energy sources to (38) ________ it.Many deserts are flat and featureless, lacking landmarks, or composed of repeating landforms such as sand (39) ________ or the jumbled ice-fields of glaciers. Advanced skills or devices are required to navigate through such landscapes and (40) ________ travelers may die when supplies run (41) ________ after becoming lost. In addition, sandstorms or blizzards may cause disorientation in severely-reduced visibility.The (42) ________ represented by wild animals in deserts has featured in explorers' accounts but does not cause higher (43) ________ of death than in other environments such as rainforests or savanna woodland, and generally does not affect human distribution. Defense against polar bears may be advisable in some areas of the Arctic. Precautions against snakes and scorpions in choosing (44) ________ at which to camp in some hot deserts should be taken.Điền câu 41

Xem chi tiết 364 lượt xem 5 năm trước

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 43 to 50.Most journeys in Britain and the US are made by road. Some of these are made on public transport but most are by private car. In Britain many people rely on their cars for daily local activities, e.g. getting to work, doing the shopping, and visiting friends. People living in urban areas may use buses, trains or, in London, the Underground, to get to city centres, mainly because traffic is often heavy and it is difficult to find anywhere to park a car. Some places in the country may have a bus only two or three times a week so people living there have no choice but to rely on their cars.In the US large cities have good public transportation systems. The El railroad in Chicago and the underground systems of New York, Boston, San Francisco and Washington, DC are heavily used. Elsewhere, most Americans prefer to use their cars. Families often have two cars and, outside major cities, have to drive fairly long distances to schools, offices, shops, banks, etc. Many college and even high-school students have their own cars.Long-distance travel in Britain is also mainly by road, though railways link most towns and cities. Most places are linked by motorways or other fast roads and many people prefer to drive at their own convenience rather than use a train, even though they may get stuck in a traffic jam. Long-distance coach/bus services are usually a cheaper alternative to trains, but they take longer and may be less comfortable. Some long-distance travel, especially that undertaken for business reasons, may be by air. There are regular flights between regional airports, as well as to and from London. A lot of freight is also distributed by road, though heavier items and raw materials often go by rail.In the US much long-distance travel is by air. America has two main long-distance bus companies, Greyhound and Trailways. Amtrak, the national network, provides rail services for passengers. Private railway companies such as Union Pacific now carry only freight, though in fact over 70% of freight goes by road.The main problems associated with road transport in both Britain and the US are traffic congestion and pollution. It is predicted that the number of cars on British roads will increase by a third within a few years, making both these problems worse. The British government would like more people to use public transport, but so far they have had little success in persuading people to give up their cars or to share rides with neighbours. Most people say that public transport is simply not good enough. Americans too have resisted government requests to share cars because it is less convenient and restricts their freedom. Petrol/gasoline is relatively cheap in the US and outside the major cities public transport is bad, so they see no reason to use their cars less.(Extracted from Oxford Guide to British and American Culture, Oxford University Press, 2000)It is mentioned in paragraph 3 that the public transportation systems in the US are good in ______. 

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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 43 to 50.Most journeys in Britain and the US are made by road. Some of these are made on public transport but most are by private car. In Britain many people rely on their cars for daily local activities, e.g. getting to work, doing the shopping, and visiting friends. People living in urban areas may use buses, trains or, in London, the Underground, to get to city centres, mainly because traffic is often heavy and it is difficult to find anywhere to park a car. Some places in the country may have a bus only two or three times a week so people living there have no choice but to rely on their cars. In the US large cities have good public transportation systems. The El railroad in Chicago and the underground systems of New York, Boston, San Francisco and Washington, DC are heavily used. Elsewhere, most Americans prefer to use their cars. Families often have two cars and, outside major cities, have to drive fairly long distances to schools, offices, shops, banks, etc. Many college and even high-school students have their own cars. Long-distance travel in Britain is also mainly by road, though railways link most towns and cities. Most places are linked by motorways or other fast roads and many people prefer to drive at their own convenience rather than use a train, even though they may get stuck in a traffic jam. Long-distance coach/bus services are usually a cheaper alternative to trains, but they take longer and may be less comfortable. Some long-distance travel, especially that undertaken for business reasons, may be by air. There are regular flights between regional airports, as well as to and from London. A lot of freight is also distributed by road, though heavier items and raw materials often go by rail.In the US much long-distance travel is by air. America has two main long-distance bus companies, Greyhound and Trailways. Amtrak, the national network, provides rail services for passengers. Private railway companies such as Union Pacific now carry only freight, though in fact over 70% of freight goes by road. The main problems associated with road transport in both Britain and the US are traffic congestion and pollution. It is predicted that the number of cars on British roads will increase by a third within a few years, making both these problems worse. The British government would like more people to use public transport, but so far they have had little success in persuading people to give up their cars or to share rides with neighbours. Most people say that public transport is simply not good enough. Americans too have resisted government requests to share cars because it is less convenient and restricts their freedom. Petrol/gasoline is relatively cheap in the US and outside the major cities public transport is bad, so they see no reason to use their cars less. (Extracted from Oxford Guide to British and American Culture, Oxford University Press, 2000)According to the passage, people in London may prefer the Underground to their own cars due to ______. 

Xem chi tiết 427 lượt xem 5 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.Most traditional human life in deserts is nomadic. It (35) ________ in hot deserts on finding water, and on following infrequent rains to (36) ________ grazing for livestock. In cold deserts, it depends on finding good hunting and fishing grounds, on sheltering from blizzards and winter (37) ________, and on storing enough food for winter. Permanent settlement in both kinds of deserts requires permanent water, food sources and adequate shelter, or the technology and energy sources to (38) ________ it.Many deserts are flat and featureless, lacking landmarks, or composed of repeating landforms such as sand (39) ________ or the jumbled ice-fields of glaciers. Advanced skills or devices are required to navigate through such landscapes and (40) ________ travelers may die when supplies run (41) ________ after becoming lost. In addition, sandstorms or blizzards may cause disorientation in severely-reduced visibility.The (42) ________ represented by wild animals in deserts has featured in explorers' accounts but does not cause higher (43) ________ of death than in other environments such as rainforests or savanna woodland, and generally does not affect human distribution. Defense against polar bears may be advisable in some areas of the Arctic. Precautions against snakes and scorpions in choosing (44) ________ at which to camp in some hot deserts should be taken.Điền câu 40

Xem chi tiết 288 lượt xem 5 năm trước

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 36 to 42The ability to conduct electricity is one of the key properties of a metal. Other solid materials such as silicon can conduct electricity but only effectively at certain temperatures. Also, some substances such as salt (sodium chloride) can conduct when molten or when dissolved in water. The ability of metals to conduct electricity is due to how their atoms bond together. In order to bond together the metal atoms lose at least one of their outermost electrons. This leaves the metal atoms with a positive charge and they are now strictly ions. The lost electrons are free to move in what is known as a sea of electrons. Since the electrons are negatively charged they attract the ions and this is what keeps the structure together. An electric current is a flow of charge and since the electrons in the sea of electrons are free to move they can be made to flow in one direction when a source of electrical energy such as a battery is connected to the metal. Hence we have an electric current flowing through the wire, and this is what makes metals such good conductors of electricity. The only other common solid conducting material that pencil users are likely to encounter is graphite (what the „lead’ of a pencil is made from). Graphite is a form of carbon and again the carbon atoms bond in such a way that there is a sea of electrons that can be made to flow as an electric current. Likewise, if we have an ionic substance like salt we can make the electrically charged ions flow to create a current but only when those ions are free to move, either when the substance is a liquid or dissolved in water. In its solid state an ionic substance like salt cannot conduct electricity as its charged ions cannot flow. Electrical insulators are substances that cannot conduct electricity well either, because they contain no charged particles or any charged particles they might contain do not flow easily. Water itself is a poor conductor of electricity as it does not contain a significant amount of fully charged particles (the ends of a water molecule are partly charged but overall the molecule is neutral). However, most water we encounter does contain dissolved charged particles, so it will be more conductive than pure water. Many of the problems that occur when touching electrical devices with wet hands result from the ever-present salt that is left on our skin through perspiration and it dissolves in the water to make it more conductive.By Helena Gillespie and Rob Gillespie. Science for Primary School Teachers. OUPWhich of the following could best serve as the title of the passage?

Xem chi tiết 859 lượt xem 5 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.Most traditional human life in deserts is nomadic. It (35) ________ in hot deserts on finding water, and on following infrequent rains to (36) ________ grazing for livestock. In cold deserts, it depends on finding good hunting and fishing grounds, on sheltering from blizzards and winter (37) ________, and on storing enough food for winter. Permanent settlement in both kinds of deserts requires permanent water, food sources and adequate shelter, or the technology and energy sources to (38) ________ it.Many deserts are flat and featureless, lacking landmarks, or composed of repeating landforms such as sand (39) ________ or the jumbled ice-fields of glaciers. Advanced skills or devices are required to navigate through such landscapes and (40) ________ travelers may die when supplies run (41) ________ after becoming lost. In addition, sandstorms or blizzards may cause disorientation in severely-reduced visibility.The (42) ________ represented by wild animals in deserts has featured in explorers' accounts but does not cause higher (43) ________ of death than in other environments such as rainforests or savanna woodland, and generally does not affect human distribution. Defense against polar bears may be advisable in some areas of the Arctic. Precautions against snakes and scorpions in choosing (44) ________ at which to camp in some hot deserts should be taken.Điền câu 39

Xem chi tiết 230 lượt xem 5 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.Most traditional human life in deserts is nomadic. It (35) ________ in hot deserts on finding water, and on following infrequent rains to (36) ________ grazing for livestock. In cold deserts, it depends on finding good hunting and fishing grounds, on sheltering from blizzards and winter (37) ________, and on storing enough food for winter. Permanent settlement in both kinds of deserts requires permanent water, food sources and adequate shelter, or the technology and energy sources to (38) ________ it.Many deserts are flat and featureless, lacking landmarks, or composed of repeating landforms such as sand (39) ________ or the jumbled ice-fields of glaciers. Advanced skills or devices are required to navigate through such landscapes and (40) ________ travelers may die when supplies run (41) ________ after becoming lost. In addition, sandstorms or blizzards may cause disorientation in severely-reduced visibility.The (42) ________ represented by wild animals in deserts has featured in explorers' accounts but does not cause higher (43) ________ of death than in other environments such as rainforests or savanna woodland, and generally does not affect human distribution. Defense against polar bears may be advisable in some areas of the Arctic. Precautions against snakes and scorpions in choosing (44) ________ at which to camp in some hot deserts should be taken.Điền câu 38

Xem chi tiết 313 lượt xem 5 năm trước

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 36 to 42The ability to conduct electricity is one of the key properties of a metal. Other solid materials such as silicon can conduct electricity but only effectively at certain temperatures. Also, some substances such as salt (sodium chloride) can conduct when molten or when dissolved in water. The ability of metals to conduct electricity is due to how their atoms bond together. In order to bond together the metal atoms lose at least one of their outermost electrons. This leaves the metal atoms with a positive charge and they are now strictly ions. The lost electrons are free to move in what is known as a sea of electrons. Since the electrons are negatively charged they attract the ions and this is what keeps the structure together. An electric current is a flow of charge and since the electrons in the sea of electrons are free to move they can be made to flow in one direction when a source of electrical energy such as a battery is connected to the metal. Hence we have an electric current flowing through the wire, and this is what makes metals such good conductors of electricity. The only other common solid conducting material that pencil users are likely to encounter is graphite (what the „lead’ of a pencil is made from). Graphite is a form of carbon and again the carbon atoms bond in such a way that there is a sea of electrons that can be made to flow as an electric current. Likewise, if we have an ionic substance like salt we can make the electrically charged ions flow to create a current but only when those ions are free to move, either when the substance is a liquid or dissolved in water. In its solid state an ionic substance like salt cannot conduct electricity as its charged ions cannot flow. Electrical insulators are substances that cannot conduct electricity well either, because they contain no charged particles or any charged particles they might contain do not flow easily. Water itself is a poor conductor of electricity as it does not contain a significant amount of fully charged particles (the ends of a water molecule are partly charged but overall the molecule is neutral). However, most water we encounter does contain dissolved charged particles, so it will be more conductive than pure water. Many of the problems that occur when touching electrical devices with wet hands result from the ever-present salt that is left on our skin through perspiration and it dissolves in the water to make it more conductive.By Helena Gillespie and Rob Gillespie. Science for Primary School Teachers. OUP    Which of the following is NOT true according to the passage?

Xem chi tiết 587 lượt xem 5 năm trước

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 36 to 42The ability to conduct electricity is one of the key properties of a metal. Other solid materials such as silicon can conduct electricity but only effectively at certain temperatures. Also, some substances such as salt (sodium chloride) can conduct when molten or when dissolved in water. The ability of metals to conduct electricity is due to how their atoms bond together. In order to bond together the metal atoms lose at least one of their outermost electrons. This leaves the metal atoms with a positive charge and they are now strictly ions. The lost electrons are free to move in what is known as a sea of electrons. Since the electrons are negatively charged they attract the ions and this is what keeps the structure together. An electric current is a flow of charge and since the electrons in the sea of electrons are free to move they can be made to flow in one direction when a source of electrical energy such as a battery is connected to the metal. Hence we have an electric current flowing through the wire, and this is what makes metals such good conductors of electricity. The only other common solid conducting material that pencil users are likely to encounter is graphite (what the „lead’ of a pencil is made from). Graphite is a form of carbon and again the carbon atoms bond in such a way that there is a sea of electrons that can be made to flow as an electric current. Likewise, if we have an ionic substance like salt we can make the electrically charged ions flow to create a current but only when those ions are free to move, either when the substance is a liquid or dissolved in water. In its solid state an ionic substance like salt cannot conduct electricity as its charged ions cannot flow. Electrical insulators are substances that cannot conduct electricity well either, because they contain no charged particles or any charged particles they might contain do not flow easily. Water itself is a poor conductor of electricity as it does not contain a significant amount of fully charged particles (the ends of a water molecule are partly charged but overall the molecule is neutral). However, most water we encounter does contain dissolved charged particles, so it will be more conductive than pure water. Many of the problems that occur when touching electrical devices with wet hands result from the ever-present salt that is left on our skin through perspiration and it dissolves in the water to make it more conductive.By Helena Gillespie and Rob Gillespie. Science for Primary School Teachers. OUP    We can have problems when touching electrical devices with wet hands because ______.

Xem chi tiết 748 lượt xem 5 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.Most traditional human life in deserts is nomadic. It (35) ________ in hot deserts on finding water, and on following infrequent rains to (36) ________ grazing for livestock. In cold deserts, it depends on finding good hunting and fishing grounds, on sheltering from blizzards and winter (37) ________, and on storing enough food for winter. Permanent settlement in both kinds of deserts requires permanent water, food sources and adequate shelter, or the technology and energy sources to (38) ________ it.Many deserts are flat and featureless, lacking landmarks, or composed of repeating landforms such as sand (39) ________ or the jumbled ice-fields of glaciers. Advanced skills or devices are required to navigate through such landscapes and (40) ________ travelers may die when supplies run (41) ________ after becoming lost. In addition, sandstorms or blizzards may cause disorientation in severely-reduced visibility.The (42) ________ represented by wild animals in deserts has featured in explorers' accounts but does not cause higher (43) ________ of death than in other environments such as rainforests or savanna woodland, and generally does not affect human distribution. Defense against polar bears may be advisable in some areas of the Arctic. Precautions against snakes and scorpions in choosing (44) ________ at which to camp in some hot deserts should be taken.Điền câu 37

Xem chi tiết 257 lượt xem 5 năm trước

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 36 to 42The ability to conduct electricity is one of the key properties of a metal. Other solid materials such as silicon can conduct electricity but only effectively at certain temperatures. Also, some substances such as salt (sodium chloride) can conduct when molten or when dissolved in water. The ability of metals to conduct electricity is due to how their atoms bond together. In order to bond together the metal atoms lose at least one of their outermost electrons. This leaves the metal atoms with a positive charge and they are now strictly ions. The lost electrons are free to move in what is known as a sea of electrons. Since the electrons are negatively charged they attract the ions and this is what keeps the structure together. An electric current is a flow of charge and since the electrons in the sea of electrons are free to move they can be made to flow in one direction when a source of electrical energy such as a battery is connected to the metal. Hence we have an electric current flowing through the wire, and this is what makes metals such good conductors of electricity. The only other common solid conducting material that pencil users are likely to encounter is graphite (what the „lead’ of a pencil is made from). Graphite is a form of carbon and again the carbon atoms bond in such a way that there is a sea of electrons that can be made to flow as an electric current. Likewise, if we have an ionic substance like salt we can make the electrically charged ions flow to create a current but only when those ions are free to move, either when the substance is a liquid or dissolved in water. In its solid state an ionic substance like salt cannot conduct electricity as its charged ions cannot flow. Electrical insulators are substances that cannot conduct electricity well either, because they contain no charged particles or any charged particles they might contain do not flow easily. Water itself is a poor conductor of electricity as it does not contain a significant amount of fully charged particles (the ends of a water molecule are partly charged but overall the molecule is neutral). However, most water we encounter does contain dissolved charged particles, so it will be more conductive than pure water. Many of the problems that occur when touching electrical devices with wet hands result from the ever-present salt that is left on our skin through perspiration and it dissolves in the water to make it more conductive.By Helena Gillespie and Rob Gillespie. Science for Primary School Teachers. OUP  Water is a poor conductor because it contains ______.

Xem chi tiết 614 lượt xem 5 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.Most traditional human life in deserts is nomadic. It (35) ________ in hot deserts on finding water, and on following infrequent rains to (36) ________ grazing for livestock. In cold deserts, it depends on finding good hunting and fishing grounds, on sheltering from blizzards and winter (37) ________, and on storing enough food for winter. Permanent settlement in both kinds of deserts requires permanent water, food sources and adequate shelter, or the technology and energy sources to (38) ________ it.Many deserts are flat and featureless, lacking landmarks, or composed of repeating landforms such as sand (39) ________ or the jumbled ice-fields of glaciers. Advanced skills or devices are required to navigate through such landscapes and (40) ________ travelers may die when supplies run (41) ________ after becoming lost. In addition, sandstorms or blizzards may cause disorientation in severely-reduced visibility.The (42) ________ represented by wild animals in deserts has featured in explorers' accounts but does not cause higher (43) ________ of death than in other environments such as rainforests or savanna woodland, and generally does not affect human distribution. Defense against polar bears may be advisable in some areas of the Arctic. Precautions against snakes and scorpions in choosing (44) ________ at which to camp in some hot deserts should be taken.Điền câu 36

Xem chi tiết 347 lượt xem 5 năm trước

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 36 to 42The ability to conduct electricity is one of the key properties of a metal. Other solid materials such as silicon can conduct electricity but only effectively at certain temperatures. Also, some substances such as salt (sodium chloride) can conduct when molten or when dissolved in water. The ability of metals to conduct electricity is due to how their atoms bond together. In order to bond together the metal atoms lose at least one of their outermost electrons. This leaves the metal atoms with a positive charge and they are now strictly ions. The lost electrons are free to move in what is known as a sea of electrons. Since the electrons are negatively charged they attract the ions and this is what keeps the structure together. An electric current is a flow of charge and since the electrons in the sea of electrons are free to move they can be made to flow in one direction when a source of electrical energy such as a battery is connected to the metal. Hence we have an electric current flowing through the wire, and this is what makes metals such good conductors of electricity. The only other common solid conducting material that pencil users are likely to encounter is graphite (what the „lead’ of a pencil is made from). Graphite is a form of carbon and again the carbon atoms bond in such a way that there is a sea of electrons that can be made to flow as an electric current. Likewise, if we have an ionic substance like salt we can make the electrically charged ions flow to create a current but only when those ions are free to move, either when the substance is a liquid or dissolved in water. In its solid state an ionic substance like salt cannot conduct electricity as its charged ions cannot flow. Electrical insulators are substances that cannot conduct electricity well either, because they contain no charged particles or any charged particles they might contain do not flow easily. Water itself is a poor conductor of electricity as it does not contain a significant amount of fully charged particles (the ends of a water molecule are partly charged but overall the molecule is neutral). However, most water we encounter does contain dissolved charged particles, so it will be more conductive than pure water. Many of the problems that occur when touching electrical devices with wet hands result from the ever-present salt that is left on our skin through perspiration and it dissolves in the water to make it more conductive.By Helena Gillespie and Rob Gillespie. Science for Primary School Teachers. OUPSalt in its solid state is not able to conduct electricity because ______.

Xem chi tiết 1.2 K lượt xem 5 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.Most traditional human life in deserts is nomadic. It (35) ________ in hot deserts on finding water, and on following infrequent rains to (36) ________ grazing for livestock. In cold deserts, it depends on finding good hunting and fishing grounds, on sheltering from blizzards and winter (37) ________, and on storing enough food for winter. Permanent settlement in both kinds of deserts requires permanent water, food sources and adequate shelter, or the technology and energy sources to (38) ________ it.Many deserts are flat and featureless, lacking landmarks, or composed of repeating landforms such as sand (39) ________ or the jumbled ice-fields of glaciers. Advanced skills or devices are required to navigate through such landscapes and (40) ________ travelers may die when supplies run (41) ________ after becoming lost. In addition, sandstorms or blizzards may cause disorientation in severely-reduced visibility.The (42) ________ represented by wild animals in deserts has featured in explorers' accounts but does not cause higher (43) ________ of death than in other environments such as rainforests or savanna woodland, and generally does not affect human distribution. Defense against polar bears may be advisable in some areas of the Arctic. Precautions against snakes and scorpions in choosing (44) ________ at which to camp in some hot deserts should be taken.Điền câu 35

Xem chi tiết 256 lượt xem 5 năm trước

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 36 to 42The ability to conduct electricity is one of the key properties of a metal. Other solid materials such as silicon can conduct electricity but only effectively at certain temperatures. Also, some substances such as salt (sodium chloride) can conduct when molten or when dissolved in water. The ability of metals to conduct electricity is due to how their atoms bond together. In order to bond together the metal atoms lose at least one of their outermost electrons. This leaves the metal atoms with a positive charge and they are now strictly ions. The lost electrons are free to move in what is known as a sea of electrons. Since the electrons are negatively charged they attract the ions and this is what keeps the structure together. An electric current is a flow of charge and since the electrons in the sea of electrons are free to move they can be made to flow in one direction when a source of electrical energy such as a battery is connected to the metal. Hence we have an electric current flowing through the wire, and this is what makes metals such good conductors of electricity. The only other common solid conducting material that pencil users are likely to encounter is graphite (what the „lead’ of a pencil is made from). Graphite is a form of carbon and again the carbon atoms bond in such a way that there is a sea of electrons that can be made to flow as an electric current. Likewise, if we have an ionic substance like salt we can make the electrically charged ions flow to create a current but only when those ions are free to move, either when the substance is a liquid or dissolved in water. In its solid state an ionic substance like salt cannot conduct electricity as its charged ions cannot flow. Electrical insulators are substances that cannot conduct electricity well either, because they contain no charged particles or any charged particles they might contain do not flow easily. Water itself is a poor conductor of electricity as it does not contain a significant amount of fully charged particles (the ends of a water molecule are partly charged but overall the molecule is neutral). However, most water we encounter does contain dissolved charged particles, so it will be more conductive than pure water. Many of the problems that occur when touching electrical devices with wet hands result from the ever-present salt that is left on our skin through perspiration and it dissolves in the water to make it more conductive.By Helena Gillespie and Rob Gillespie. Science for Primary School Teachers. OUPThe word “outermost” in paragraph 1 mostly means ______.

Xem chi tiết 704 lượt xem 5 năm trước

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 36 to 42The ability to conduct electricity is one of the key properties of a metal. Other solid materials such as silicon can conduct electricity but only effectively at certain temperatures. Also, some substances such as salt (sodium chloride) can conduct when molten or when dissolved in water. The ability of metals to conduct electricity is due to how their atoms bond together. In order to bond together the metal atoms lose at least one of their outermost electrons. This leaves the metal atoms with a positive charge and they are now strictly ions. The lost electrons are free to move in what is known as a sea of electrons. Since the electrons are negatively charged they attract the ions and this is what keeps the structure together. An electric current is a flow of charge and since the electrons in the sea of electrons are free to move they can be made to flow in one direction when a source of electrical energy such as a battery is connected to the metal. Hence we have an electric current flowing through the wire, and this is what makes metals such good conductors of electricity. The only other common solid conducting material that pencil users are likely to encounter is graphite (what the „lead’ of a pencil is made from). Graphite is a form of carbon and again the carbon atoms bond in such a way that there is a sea of electrons that can be made to flow as an electric current. Likewise, if we have an ionic substance like salt we can make the electrically charged ions flow to create a current but only when those ions are free to move, either when the substance is a liquid or dissolved in water. In its solid state an ionic substance like salt cannot conduct electricity as its charged ions cannot flow. Electrical insulators are substances that cannot conduct electricity well either, because they contain no charged particles or any charged particles they might contain do not flow easily. Water itself is a poor conductor of electricity as it does not contain a significant amount of fully charged particles (the ends of a water molecule are partly charged but overall the molecule is neutral). However, most water we encounter does contain dissolved charged particles, so it will be more conductive than pure water. Many of the problems that occur when touching electrical devices with wet hands result from the ever-present salt that is left on our skin through perspiration and it dissolves in the water to make it more conductive. By Helena Gillespie and Rob Gillespie. Science for Primary School Teachers. OUPAccording to the passage, a metal can conduct electricity due to ______.

Xem chi tiết 1.3 K lượt xem 5 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that bestfits each of the numbered blanks from 31 to35.In addition to the challenge to be excellent, American schools have been facing novel problems. They must (31)______ with an influx of immigrant children, many of whom speak little or no English. They must respond to demands that the curriculum reflect the various cultures of all children. Schools must make sure that students develop basic skills for the job market, and they must consider the needs of nontraditional students, such as teenage mothers.Schools are (32)______ these problems in ways that reflect the diversity of the US educational system. They are hiring or training large numbers of teachers of English as a second language and, in some communities, setting up bilingual schools. They are opening up the traditional European-centered curriculum to embrace material from African, Asian, and other cultures. Schools are also teaching cognitive skills to the (33)______ 40 percent of American students who do not go on to higher education. In the (34)______ of a recent report by the Commission on Achieving Necessary Skills, “A strong back, the willingness to work, and a high school diploma were once all that was necessary to (35)______ a start in America. They are no longer. A well- developed mind, a continued willingness to learn and the ability to put knowledge to work are the new keys to the future of our young people, the success of our business, and the economic well-being of the nation.”Điền ô 35

Xem chi tiết 464 lượt xem 5 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that bestfits each of the numbered blanks from 31 to35.In addition to the challenge to be excellent, American schools have been facing novel problems. They must (31)______ with an influx of immigrant children, many of whom speak little or no English. They must respond to demands that the curriculum reflect the various cultures of all children. Schools must make sure that students develop basic skills for the job market, and they must consider the needs of nontraditional students, such as teenage mothers.Schools are (32)______ these problems in ways that reflect the diversity of the US educational system. They are hiring or training large numbers of teachers of English as a second language and, in some communities, setting up bilingual schools. They are opening up the traditional European-centered curriculum to embrace material from African, Asian, and other cultures. Schools are also teaching cognitive skills to the (33)______ 40 percent of American students who do not go on to higher education. In the (34)______ of a recent report by the Commission on Achieving Necessary Skills, “A strong back, the willingness to work, and a high school diploma were once all that was necessary to (35)______ a start in America. They are no longer. A well- developed mind, a continued willingness to learn and the ability to put knowledge to work are the new keys to the future of our young people, the success of our business, and the economic well-being of the nation.”Điền ô 34

Xem chi tiết 248 lượt xem 5 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that bestfits each of the numbered blanks from 31 to35.In addition to the challenge to be excellent, American schools have been facing novel problems. They must (31)______ with an influx of immigrant children, many of whom speak little or no English. They must respond to demands that the curriculum reflect the various cultures of all children. Schools must make sure that students develop basic skills for the job market, and they must consider the needs of nontraditional students, such as teenage mothers.Schools are (32)______ these problems in ways that reflect the diversity of the US educational system. They are hiring or training large numbers of teachers of English as a second language and, in some communities, setting up bilingual schools. They are opening up the traditional European-centered curriculum to embrace material from African, Asian, and other cultures. Schools are also teaching cognitive skills to the (33)______ 40 percent of American students who do not go on to higher education. In the (34)______ of a recent report by the Commission on Achieving Necessary Skills, “A strong back, the willingness to work, and a high school diploma were once all that was necessary to (35)______ a start in America. They are no longer. A well- developed mind, a continued willingness to learn and the ability to put knowledge to work are the new keys to the future of our young people, the success of our business, and the economic well-being of the nation.”Điền ô 33

Xem chi tiết 264 lượt xem 5 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that bestfits each of the numbered blanks from 31 to35.In addition to the challenge to be excellent, American schools have been facing novel problems. They must (31)______ with an influx of immigrant children, many of whom speak little or no English. They must respond to demands that the curriculum reflect the various cultures of all children. Schools must make sure that students develop basic skills for the job market, and they must consider the needs of nontraditional students, such as teenage mothers.Schools are (32)______ these problems in ways that reflect the diversity of the US educational system. They are hiring or training large numbers of teachers of English as a second language and, in some communities, setting up bilingual schools. They are opening up the traditional European-centered curriculum to embrace material from African, Asian, and other cultures. Schools are also teaching cognitive skills to the (33)______ 40 percent of American students who do not go on to higher education. In the (34)______ of a recent report by the Commission on Achieving Necessary Skills, “A strong back, the willingness to work, and a high school diploma were once all that was necessary to (35)______ a start in America. They are no longer. A well- developed mind, a continued willingness to learn and the ability to put knowledge to work are the new keys to the future of our young people, the success of our business, and the economic well-being of the nation.”Điền ô 32

Xem chi tiết 321 lượt xem 5 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that bestfits each of the numbered blanks from 31 to35.In addition to the challenge to be excellent, American schools have been facing novel problems. They must (31)______ with an influx of immigrant children, many of whom speak little or no English. They must respond to demands that the curriculum reflect the various cultures of all children. Schools must make sure that students develop basic skills for the job market, and they must consider the needs of nontraditional students, such as teenage mothers.Schools are (32)______ these problems in ways that reflect the diversity of the US educational system. They are hiring or training large numbers of teachers of English as a second language and, in some communities, setting up bilingual schools. They are opening up the traditional European-centered curriculum to embrace material from African, Asian, and other cultures. Schools are also teaching cognitive skills to the (33)______ 40 percent of American students who do not go on to higher education. In the (34)______ of a recent report by the Commission on Achieving Necessary Skills, “A strong back, the willingness to work, and a high school diploma were once all that was necessary to (35)______ a start in America. They are no longer. A well- developed mind, a continued willingness to learn and the ability to put knowledge to work are the new keys to the future of our young people, the success of our business, and the economic well-being of the nation.”Điền ô 31

Xem chi tiết 260 lượt xem 5 năm trước

Read the following passage and mark the letter A, B, C, or D to indicate the best answer to each of the following questions.Shyness may not seem to be a serious complaint, but for some who suffer from it, it can become unbearable. Even talking to a small group of people you know can seem like an ordeal - it can feel as if you’ve been asked to give a speech on a topic you know very little about to a number of experts. You start to feel hot and shaky, your heart beats faster, your knees feel weak, you begin to stutter and the whole experience seems to last forever.The fact of the matter is that shyness is something we often recognize in others: blushing is one of the more visible signs, for example. Yet we do not judge someone harshly because of this. But shyness does mean you are harder to approach, so you become more isolated. As one shy person put it, “It’s like being in a prison, and it’s very hard to break out.”Experts on the subject have come up with various possible solutions, and one has been singled out as being the key to success, namely, finding an interest in common with other people. Spending a lot of time on the sidelines watching other people and envying them because they are much more outgoing doesn’t help; remembering that some of the people you envy most are probably shy themselves. The secret is how you deal with it. And experts have come up with four things you can do today to help. Firstly, you can start by listening to other people. You will find yourself getting interested in what they’re talking about and asking questions, and before you know it, you’ll be having a conversation. Secondly, you could try asking neighbors if you can walk their dog. Like children, pets can be excellent icebreakers for conversations with passers-by. Thirdly, try joining a class to learn something like tap-dancing or flamenco, where people are likely to laugh a lot. You’ll feel relaxed, and also you’ll be much too busy concentrating on what you are doing to feel shy. Lastly, try telling yourself that it doesn’t matter if you say or do something silly. Most people make a fool of themselves every so often, and it’s not the end of the world if you do.How can listening to others prove helpful in combating shyness?

Xem chi tiết 522 lượt xem 5 năm trước

Read the following passage and mark the letter A, B, C, or D to indicate the best answer to each of the following questions.Shyness may not seem to be a serious complaint, but for some who suffer from it, it can become unbearable. Even talking to a small group of people you know can seem like an ordeal - it can feel as if you’ve been asked to give a speech on a topic you know very little about to a number of experts. You start to feel hot and shaky, your heart beats faster, your knees feel weak, you begin to stutter and the whole experience seems to last forever.The fact of the matter is that shyness is something we often recognize in others: blushing is one of the more visible signs, for example. Yet we do not judge someone harshly because of this. But shyness does mean you are harder to approach, so you become more isolated. As one shy person put it, “It’s like being in a prison, and it’s very hard to break out.”Experts on the subject have come up with various possible solutions, and one has been singled out as being the key to success, namely, finding an interest in common with other people. Spending a lot of time on the sidelines watching other people and envying them because they are much more outgoing doesn’t help; remembering that some of the people you envy most are probably shy themselves. The secret is how you deal with it. And experts have come up with four things you can do today to help. Firstly, you can start by listening to other people. You will find yourself getting interested in what they’re talking about and asking questions, and before you know it, you’ll be having a conversation. Secondly, you could try asking neighbors if you can walk their dog. Like children, pets can be excellent icebreakers for conversations with passers-by. Thirdly, try joining a class to learn something like tap-dancing or flamenco, where people are likely to laugh a lot. You’ll feel relaxed, and also you’ll be much too busy concentrating on what you are doing to feel shy. Lastly, try telling yourself that it doesn’t matter if you say or do something silly. Most people make a fool of themselves every so often, and it’s not the end of the world if you doWhat do experts believe is the most essential measure to be taken

Xem chi tiết 425 lượt xem 5 năm trước

Read the following passage and mark the letter A, B, C, or D to indicate the best answer to each of the following questions.Shyness may not seem to be a serious complaint, but for some who suffer from it, it can become unbearable. Even talking to a small group of people you know can seem like an ordeal - it can feel as if you’ve been asked to give a speech on a topic you know very little about to a number of experts. You start to feel hot and shaky, your heart beats faster, your knees feel weak, you begin to stutter and the whole experience seems to last forever.The fact of the matter is that shyness is something we often recognize in others: blushing is one of the more visible signs, for example. Yet we do not judge someone harshly because of this. But shyness does mean you are harder to approach, so you become more isolated. As one shy person put it, “It’s like being in a prison, and it’s very hard to break out.”Experts on the subject have come up with various possible solutions, and one has been singled out as being the key to success, namely, finding an interest in common with other people. Spending a lot of time on the sidelines watching other people and envying them because they are much more outgoing doesn’t help; remembering that some of the people you envy most are probably shy themselves. The secret is how you deal with it. And experts have come up with four things you can do today to help. Firstly, you can start by listening to other people. You will find yourself getting interested in what they’re talking about and asking questions, and before you know it, you’ll be having a conversation. Secondly, you could try asking neighbors if you can walk their dog. Like children, pets can be excellent icebreakers for conversations with passers-by. Thirdly, try joining a class to learn something like tap-dancing or flamenco, where people are likely to laugh a lot. You’ll feel relaxed, and also you’ll be much too busy concentrating on what you are doing to feel shy. Lastly, try telling yourself that it doesn’t matter if you say or do something silly. Most people make a fool of themselves every so often, and it’s not the end of the world if you doThe word “blushing” in paragraph 2 is closest in meaning to ________.

Xem chi tiết 273 lượt xem 5 năm trước

Read the following passage and mark the letter A, B, C, or D to indicate the best answer to each of the following questions.Shyness may not seem to be a serious complaint, but for some who suffer from it, it can become unbearable. Even talking to a small group of people you know can seem like an ordeal - it can feel as if you’ve been asked to give a speech on a topic you know very little about to a number of experts. You start to feel hot and shaky, your heart beats faster, your knees feel weak, you begin to stutter and the whole experience seems to last forever.The fact of the matter is that shyness is something we often recognize in others: blushing is one of the more visible signs, for example. Yet we do not judge someone harshly because of this. But shyness does mean you are harder to approach, so you become more isolated. As one shy person put it, “It’s like being in a prison, and it’s very hard to break out.”Experts on the subject have come up with various possible solutions, and one has been singled out as being the key to success, namely, finding an interest in common with other people. Spending a lot of time on the sidelines watching other people and envying them because they are much more outgoing doesn’t help; remembering that some of the people you envy most are probably shy themselves. The secret is how you deal with it. And experts have come up with four things you can do today to help. Firstly, you can start by listening to other people. You will find yourself getting interested in what they’re talking about and asking questions, and before you know it, you’ll be having a conversation. Secondly, you could try asking neighbors if you can walk their dog. Like children, pets can be excellent icebreakers for conversations with passers-by. Thirdly, try joining a class to learn something like tap-dancing or flamenco, where people are likely to laugh a lot. You’ll feel relaxed, and also you’ll be much too busy concentrating on what you are doing to feel shy. Lastly, try telling yourself that it doesn’t matter if you say or do something silly. Most people make a fool of themselves every so often, and it’s not the end of the world if you doWhy do shy people become more reserved?

Xem chi tiết 760 lượt xem 5 năm trước

Read the following passage and mark the letter A, B, C, or D to indicate the best answer to each of the following questions.Shyness may not seem to be a serious complaint, but for some who suffer from it, it can become unbearable. Even talking to a small group of people you know can seem like an ordeal - it can feel as if you’ve been asked to give a speech on a topic you know very little about to a number of experts. You start to feel hot and shaky, your heart beats faster, your knees feel weak, you begin to stutter and the whole experience seems to last forever.The fact of the matter is that shyness is something we often recognize in others: blushing is one of the more visible signs, for example. Yet we do not judge someone harshly because of this. But shyness does mean you are harder to approach, so you become more isolated. As one shy person put it, “It’s like being in a prison, and it’s very hard to break out.”Experts on the subject have come up with various possible solutions, and one has been singled out as being the key to success, namely, finding an interest in common with other people. Spending a lot of time on the sidelines watching other people and envying them because they are much more outgoing doesn’t help; remembering that some of the people you envy most are probably shy themselves. The secret is how you deal with it. And experts have come up with four things you can do today to help. Firstly, you can start by listening to other people. You will find yourself getting interested in what they’re talking about and asking questions, and before you know it, you’ll be having a conversation. Secondly, you could try asking neighbors if you can walk their dog. Like children, pets can be excellent icebreakers for conversations with passers-by. Thirdly, try joining a class to learn something like tap-dancing or flamenco, where people are likely to laugh a lot. You’ll feel relaxed, and also you’ll be much too busy concentrating on what you are doing to feel shy. Lastly, try telling yourself that it doesn’t matter if you say or do something silly. Most people make a fool of themselves every so often, and it’s not the end of the world if you do.

Xem chi tiết 0.9 K lượt xem 5 năm trước