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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 word for each of the blanks.One of the most important (3)_______ of a standardized test is time. You'll only be allowed a certain number of minutes for each section, so it is very important that you use your time (4)_______. The most important time strategy is pacing yourself. Before you begin, take just a few seconds to survey the test, noting the (5)_______of questions and the sections that looks easier than the rest. Then, make a rough time schedule based (6)_______ the amount of time available to you. Mark the halfway point on your test and make a note beside that mark of the time when the testing period is half over.Once you begin the test, continue moving. If you work slowly in an attempt to (7)_______ fewer mistakes, your mind will become bored and begin to wander. You'll end up with far (8)_______ mistakes if you're not concentrating. If you take too long to answer questions that stump you, you may end up (9)_______ out of time before you finish. So don't stop for difficult questions. Skip them and move on. You can come back to them later (10)_______ you have time. A question that takes you five seconds to answer counts as much as one that takes you several minutes, so pick up the easy points first. (11)_______, answering the easier questions first helps build your confidence and gets you in the testing groove. If you're a little ahead, you know you're on track and may even have a little time left to check your work. If you're a little behind, you have several choices. You can pick up the pace a little, but do this only if you can do it (12)_______.Điền vào ô số 11

Xem chi tiết 559 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 for each of the blanks.One of the most important (3)_______ of a standardized test is time. You'll only be allowed a certain number of minutes for each section, so it is very important that you use your time (4)_______. The most important time strategy is pacing yourself. Before you begin, take just a few seconds to survey the test, noting the (5)_______of questions and the sections that looks easier than the rest. Then, make a rough time schedule based (6)_______ the amount of time available to you. Mark the halfway point on your test and make a note beside that mark of the time when the testing period is half over.Once you begin the test, continue moving. If you work slowly in an attempt to (7)_______ fewer mistakes, your mind will become bored and begin to wander. You'll end up with far (8)_______ mistakes if you're not concentrating. If you take too long to answer questions that stump you, you may end up (9)_______ out of time before you finish. So don't stop for difficult questions. Skip them and move on. You can come back to them later (10)_______ you have time. A question that takes you five seconds to answer counts as much as one that takes you several minutes, so pick up the easy points first. (11)_______, answering the easier questions first helps build your confidence and gets you in the testing groove. If you're a little ahead, you know you're on track and may even have a little time left to check your work. If you're a little behind, you have several choices. You can pick up the pace a little, but do this only if you can do it (12)_______.Điền vào ô số 10

Xem chi tiết 305 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 for each of the blanks.One of the most important (3)_______ of a standardized test is time. You'll only be allowed a certain number of minutes for each section, so it is very important that you use your time (4)_______. The most important time strategy is pacing yourself. Before you begin, take just a few seconds to survey the test, noting the (5)_______of questions and the sections that looks easier than the rest. Then, make a rough time schedule based (6)_______ the amount of time available to you. Mark the halfway point on your test and make a note beside that mark of the time when the testing period is half over.Once you begin the test, continue moving. If you work slowly in an attempt to (7)_______ fewer mistakes, your mind will become bored and begin to wander. You'll end up with far (8)_______ mistakes if you're not concentrating. If you take too long to answer questions that stump you, you may end up (9)_______ out of time before you finish. So don't stop for difficult questions. Skip them and move on. You can come back to them later (10)_______ you have time. A question that takes you five seconds to answer counts as much as one that takes you several minutes, so pick up the easy points first. (11)_______, answering the easier questions first helps build your confidence and gets you in the testing groove. If you're a little ahead, you know you're on track and may even have a little time left to check your work. If you're a little behind, you have several choices. You can pick up the pace a little, but do this only if you can do it (12)_______.Điền vào ô số 9

Xem chi tiết 252 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 for each of the blanks.One of the most important (3)_______ of a standardized test is time. You'll only be allowed a certain number of minutes for each section, so it is very important that you use your time (4)_______. The most important time strategy is pacing yourself. Before you begin, take just a few seconds to survey the test, noting the (5)_______of questions and the sections that looks easier than the rest. Then, make a rough time schedule based (6)_______ the amount of time available to you. Mark the halfway point on your test and make a note beside that mark of the time when the testing period is half over.Once you begin the test, continue moving. If you work slowly in an attempt to (7)_______ fewer mistakes, your mind will become bored and begin to wander. You'll end up with far (8)_______ mistakes if you're not concentrating. If you take too long to answer questions that stump you, you may end up (9)_______ out of time before you finish. So don't stop for difficult questions. Skip them and move on. You can come back to them later (10)_______ you have time. A question that takes you five seconds to answer counts as much as one that takes you several minutes, so pick up the easy points first. (11)_______, answering the easier questions first helps build your confidence and gets you in the testing groove. If you're a little ahead, you know you're on track and may even have a little time left to check your work. If you're a little behind, you have several choices. You can pick up the pace a little, but do this only if you can do it (12)_______.Điền vào ô số 8

Xem chi tiết 324 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 for each of the blanks.One of the most important (3)_______ of a standardized test is time. You'll only be allowed a certain number of minutes for each section, so it is very important that you use your time (4)_______. The most important time strategy is pacing yourself. Before you begin, take just a few seconds to survey the test, noting the (5)_______of questions and the sections that looks easier than the rest. Then, make a rough time schedule based (6)_______ the amount of time available to you. Mark the halfway point on your test and make a note beside that mark of the time when the testing period is half over.Once you begin the test, continue moving. If you work slowly in an attempt to (7)_______ fewer mistakes, your mind will become bored and begin to wander. You'll end up with far (8)_______ mistakes if you're not concentrating. If you take too long to answer questions that stump you, you may end up (9)_______ out of time before you finish. So don't stop for difficult questions. Skip them and move on. You can come back to them later (10)_______ you have time. A question that takes you five seconds to answer counts as much as one that takes you several minutes, so pick up the easy points first. (11)_______, answering the easier questions first helps build your confidence and gets you in the testing groove. If you're a little ahead, you know you're on track and may even have a little time left to check your work. If you're a little behind, you have several choices. You can pick up the pace a little, but do this only if you can do it (12)_______.Điền vào ô số 7

Xem chi tiết 1 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 for each of the blanks.One of the most important (3)_______ of a standardized test is time. You'll only be allowed a certain number of minutes for each section, so it is very important that you use your time (4)_______. The most important time strategy is pacing yourself. Before you begin, take just a few seconds to survey the test, noting the (5)_______of questions and the sections that looks easier than the rest. Then, make a rough time schedule based (6)_______ the amount of time available to you. Mark the halfway point on your test and make a note beside that mark of the time when the testing period is half over.Once you begin the test, continue moving. If you work slowly in an attempt to (7)_______ fewer mistakes, your mind will become bored and begin to wander. You'll end up with far (8)_______ mistakes if you're not concentrating. If you take too long to answer questions that stump you, you may end up (9)_______ out of time before you finish. So don't stop for difficult questions. Skip them and move on. You can come back to them later (10)_______ you have time. A question that takes you five seconds to answer counts as much as one that takes you several minutes, so pick up the easy points first. (11)_______, answering the easier questions first helps build your confidence and gets you in the testing groove. If you're a little ahead, you know you're on track and may even have a little time left to check your work. If you're a little behind, you have several choices. You can pick up the pace a little, but do this only if you can do it (12)_______.Điền vào ô số 6

Xem chi tiết 2.7 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 for each of the blanks.One of the most important (3)_______ of a standardized test is time. You'll only be allowed a certain number of minutes for each section, so it is very important that you use your time (4)_______. The most important time strategy is pacing yourself. Before you begin, take just a few seconds to survey the test, noting the (5)_______of questions and the sections that looks easier than the rest. Then, make a rough time schedule based (6)_______ the amount of time available to you. Mark the halfway point on your test and make a note beside that mark of the time when the testing period is half over.Once you begin the test, continue moving. If you work slowly in an attempt to (7)_______ fewer mistakes, your mind will become bored and begin to wander. You'll end up with far (8)_______ mistakes if you're not concentrating. If you take too long to answer questions that stump you, you may end up (9)_______ out of time before you finish. So don't stop for difficult questions. Skip them and move on. You can come back to them later (10)_______ you have time. A question that takes you five seconds to answer counts as much as one that takes you several minutes, so pick up the easy points first. (11)_______, answering the easier questions first helps build your confidence and gets you in the testing groove. If you're a little ahead, you know you're on track and may even have a little time left to check your work. If you're a little behind, you have several choices. You can pick up the pace a little, but do this only if you can do it (12)_______.Điền vào ô số 5

Xem chi tiết 1 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 for each of the blanks.One of the most important (3)_______ of a standardized test is time. You'll only be allowed a certain number of minutes for each section, so it is very important that you use your time (4)_______. The most important time strategy is pacing yourself. Before you begin, take just a few seconds to survey the test, noting the (5)_______of questions and the sections that looks easier than the rest. Then, make a rough time schedule based (6)_______ the amount of time available to you. Mark the halfway point on your test and make a note beside that mark of the time when the testing period is half over.Once you begin the test, continue moving. If you work slowly in an attempt to (7)_______ fewer mistakes, your mind will become bored and begin to wander. You'll end up with far (8)_______ mistakes if you're not concentrating. If you take too long to answer questions that stump you, you may end up (9)_______ out of time before you finish. So don't stop for difficult questions. Skip them and move on. You can come back to them later (10)_______ you have time. A question that takes you five seconds to answer counts as much as one that takes you several minutes, so pick up the easy points first. (11)_______, answering the easier questions first helps build your confidence and gets you in the testing groove. If you're a little ahead, you know you're on track and may even have a little time left to check your work. If you're a little behind, you have several choices. You can pick up the pace a little, but do this only if you can do it (12)_______.Điền vào ô số 4

Xem chi tiết 1 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 for each of the blanks.One of the most important (3)_______ of a standardized test is time. You'll only be allowed a certain number of minutes for each section, so it is very important that you use your time (4)_______. The most important time strategy is pacing yourself. Before you begin, take just a few seconds to survey the test, noting the (5)_______of questions and the sections that looks easier than the rest. Then, make a rough time schedule based (6)_______ the amount of time available to you. Mark the halfway point on your test and make a note beside that mark of the time when the testing period is half over.Once you begin the test, continue moving. If you work slowly in an attempt to (7)_______ fewer mistakes, your mind will become bored and begin to wander. You'll end up with far (8)_______ mistakes if you're not concentrating. If you take too long to answer questions that stump you, you may end up (9)_______ out of time before you finish. So don't stop for difficult questions. Skip them and move on. You can come back to them later (10)_______ you have time. A question that takes you five seconds to answer counts as much as one that takes you several minutes, so pick up the easy points first. (11)_______, answering the easier questions first helps build your confidence and gets you in the testing groove. If you're a little ahead, you know you're on track and may even have a little time left to check your work. If you're a little behind, you have several choices. You can pick up the pace a little, but do this only if you can do it (12)_______.Điền vào ô số 3

Xem chi tiết 2.8 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 55 to 64Genetics is the study of hereditary characteristics that are passed down from one generation of living organisms to another. Although farmers have used selective breeding to improve the resilience of crops and animals, it wasn't until the mid 1800s that Gregor Mendel started the science of genetics as we know it today. Following Mendel's methods, scientists have discovered "chromosomes" and "DNA". With the ability to study DNA, scientists were ableto study the genetic differences between races.Modern genetics discovered that all humans are descendants of "Mitochondrial Eve," a woman who lived over 150,000 years ago in Africa. Since the first humans were born, over 75,000 generations have passed, and many subtle differences are now evident. Humans share at least 99% of their genetic makeup. A 1% difference may not seem like much, but when you consider that a chimpanzee shares 98% of human genes, you realize how much a 1% difference makes!Africans are more closely related to Europeans than any other two groups, despite the fact that they differ so much in appearance. The biggest genetic differences are found between Africans and the native populations of NorthAmerica (22%). However, it is essential to note that the genetic differences between people of the same race are much greater than the differences between people of different races. This means that the argument which claims that genetic differences make one race superior to another is nothing but a tall story.The differences in various populations may also be the result of circumstances rather than genetic makeup. Factors such as climate, diet, health care, education, and employment as well as other socioeconomic factors are all influential. However, there are some traits which are genetic; for example, there is a much higher incidence of sickle-cell anemia among black populations than any other population group. Adult African-Americans and Latinos have twice as many cases of diabetes than Caucasians. In the U.S., Latinos suffer more deaths from liver disease than other races. Europeans suffer more from heart disease and cancer.Genes not only affect our susceptibility to disease, they also affect our physical attributes. The Dinka people from the Sudan are considered to be the tallest people with men having an average height of 6ft 3in., while women hit the big time with an impressive 5ft 3in. This contrasts sharply with the Pygmy tribes who get the short end of the stick at only about 4ft 11in.tall. Genetic differences may help us to tailor health services to people of different races or to detect life threatening diseases early. However, they are not significant enough to support the claim that one race is superior toanother. In fact, our modern scientific understanding of human genetic diversity flies in the face of almost all our social stereotypesWhat is the author saying in the last paragraph?

Xem chi tiết 409 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 55 to 64Genetics is the study of hereditary characteristics that are passed down from one generation of living organisms to another. Although farmers have used selective breeding to improve the resilience of crops and animals, it wasn't until the mid 1800s that Gregor Mendel started the science of genetics as we know it today. Following Mendel's methods, scientists have discovered "chromosomes" and "DNA". With the ability to study DNA, scientists were ableto study the genetic differences between races.Modern genetics discovered that all humans are descendants of "Mitochondrial Eve," a woman who lived over 150,000 years ago in Africa. Since the first humans were born, over 75,000 generations have passed, and many subtle differences are now evident. Humans share at least 99% of their genetic makeup. A 1% difference may not seem like much, but when you consider that a chimpanzee shares 98% of human genes, you realize how much a 1% difference makes!Africans are more closely related to Europeans than any other two groups, despite the fact that they differ so much in appearance. The biggest genetic differences are found between Africans and the native populations of NorthAmerica (22%). However, it is essential to note that the genetic differences between people of the same race are much greater than the differences between people of different races. This means that the argument which claims that genetic differences make one race superior to another is nothing but a tall story.The differences in various populations may also be the result of circumstances rather than genetic makeup. Factors such as climate, diet, health care, education, and employment as well as other socioeconomic factors are all influential. However, there are some traits which are genetic; for example, there is a much higher incidence of sickle-cell anemia among black populations than any other population group. Adult African-Americans and Latinos have twice as many cases of diabetes than Caucasians. In the U.S., Latinos suffer more deaths from liver disease than other races. Europeans suffer more from heart disease and cancer.Genes not only affect our susceptibility to disease, they also affect our physical attributes. The Dinka people from the Sudan are considered to be the tallest people with men having an average height of 6ft 3in., while women hit the big time with an impressive 5ft 3in. This contrasts sharply with the Pygmy tribes who get the short end of the stick at only about 4ft 11in.tall. Genetic differences may help us to tailor health services to people of different races or to detect life threatening diseases early. However, they are not significant enough to support the claim that one race is superior toanother. In fact, our modern scientific understanding of human genetic diversity flies in the face of almost all our social stereotypesWhich diseases are Africans – Americans more likely to get?

Xem chi tiết 305 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 55 to 64Genetics is the study of hereditary characteristics that are passed down from one generation of living organisms to another. Although farmers have used selective breeding to improve the resilience of crops and animals, it wasn't until the mid 1800s that Gregor Mendel started the science of genetics as we know it today. Following Mendel's methods, scientists have discovered "chromosomes" and "DNA". With the ability to study DNA, scientists were ableto study the genetic differences between races.Modern genetics discovered that all humans are descendants of "Mitochondrial Eve," a woman who lived over 150,000 years ago in Africa. Since the first humans were born, over 75,000 generations have passed, and many subtle differences are now evident. Humans share at least 99% of their genetic makeup. A 1% difference may not seem like much, but when you consider that a chimpanzee shares 98% of human genes, you realize how much a 1% difference makes!Africans are more closely related to Europeans than any other two groups, despite the fact that they differ so much in appearance. The biggest genetic differences are found between Africans and the native populations of NorthAmerica (22%). However, it is essential to note that the genetic differences between people of the same race are much greater than the differences between people of different races. This means that the argument which claims that genetic differences make one race superior to another is nothing but a tall story.The differences in various populations may also be the result of circumstances rather than genetic makeup. Factors such as climate, diet, health care, education, and employment as well as other socioeconomic factors are all influential. However, there are some traits which are genetic; for example, there is a much higher incidence of sickle-cell anemia among black populations than any other population group. Adult African-Americans and Latinos have twice as many cases of diabetes than Caucasians. In the U.S., Latinos suffer more deaths from liver disease than other races. Europeans suffer more from heart disease and cancer.Genes not only affect our susceptibility to disease, they also affect our physical attributes. The Dinka people from the Sudan are considered to be the tallest people with men having an average height of 6ft 3in., while women hit the big time with an impressive 5ft 3in. This contrasts sharply with the Pygmy tribes who get the short end of the stick at only about 4ft 11in.tall. Genetic differences may help us to tailor health services to people of different races or to detect life threatening diseases early. However, they are not significant enough to support the claim that one race is superior toanother. In fact, our modern scientific understanding of human genetic diversity flies in the face of almost all our social stereotypesWhat does the writer mean with the idiom “ hit the big time”?

Xem chi tiết 229 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 55 to 64Genetics is the study of hereditary characteristics that are passed down from one generation of living organisms to another. Although farmers have used selective breeding to improve the resilience of crops and animals, it wasn't until the mid 1800s that Gregor Mendel started the science of genetics as we know it today. Following Mendel's methods, scientists have discovered "chromosomes" and "DNA". With the ability to study DNA, scientists were ableto study the genetic differences between races.Modern genetics discovered that all humans are descendants of "Mitochondrial Eve," a woman who lived over 150,000 years ago in Africa. Since the first humans were born, over 75,000 generations have passed, and many subtle differences are now evident. Humans share at least 99% of their genetic makeup. A 1% difference may not seem like much, but when you consider that a chimpanzee shares 98% of human genes, you realize how much a 1% difference makes!Africans are more closely related to Europeans than any other two groups, despite the fact that they differ so much in appearance. The biggest genetic differences are found between Africans and the native populations of NorthAmerica (22%). However, it is essential to note that the genetic differences between people of the same race are much greater than the differences between people of different races. This means that the argument which claims that genetic differences make one race superior to another is nothing but a tall story.The differences in various populations may also be the result of circumstances rather than genetic makeup. Factors such as climate, diet, health care, education, and employment as well as other socioeconomic factors are all influential. However, there are some traits which are genetic; for example, there is a much higher incidence of sickle-cell anemia among black populations than any other population group. Adult African-Americans and Latinos have twice as many cases of diabetes than Caucasians. In the U.S., Latinos suffer more deaths from liver disease than other races. Europeans suffer more from heart disease and cancer.Genes not only affect our susceptibility to disease, they also affect our physical attributes. The Dinka people from the Sudan are considered to be the tallest people with men having an average height of 6ft 3in., while women hit the big time with an impressive 5ft 3in. This contrasts sharply with the Pygmy tribes who get the short end of the stick at only about 4ft 11in.tall. Genetic differences may help us to tailor health services to people of different races or to detect life threatening diseases early. However, they are not significant enough to support the claim that one race is superior toanother. In fact, our modern scientific understanding of human genetic diversity flies in the face of almost all our social stereotypesWhat two factors contribute to the differences between races?

Xem chi tiết 495 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 questionsIn this era of increased global warming and diminishing fossil fuel supplies, we must begin to put a greater priority on harnessing alternative energy sources. Fortunately, there are a number of readily available, renewable resources that are both cost- effective and earth – friendly. Two such resources are solar power and geothermal powerSolar energy, which reaches the earth through sunlight, is so abundant that it could meet the needs of worldwide energy consumption 6,000 times over. And solar energy is easily harnessed through the use of photovoltaic cells that convert sunlight to electricity. In theUSalone, more than 100, 000 homes are equipped with solar electric systems in the form of solar panels or solar roof tiles. And in other parts of the world, including many developing countries, the use of solar system is growing steadilyAnother alternative energy source, which is abundant in specific geographical areas, is geothermal power, which creates energy by tapping heat from below the surface of the earth. Hot water and steam that are trapped in underground pools are pumped to the surface and used to run a generator, which is produces electricity. Geothermal energy is 50, 000 times more abundant than the entire known supply of fossil fuel resources. And as with solar power, the technology needed to utilize geothermal energy is fairly simple. A prime example of effective geothermal use inIceland, a region of high geothermal activity where over 80 percent of private homes are heated by geothermal power.Solar and geothermal energy are  just two of promising renewable alternatives to conventional energy sources. The time is long overdue to invest in the development and use of alternative energy on global scaleWhat best describes the author’s purpose in writing the passage ?

Xem chi tiết 697 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.Early humans saw a variety of natural colours around them, from the browns and greens of the soil and plants to the deep blues and red of the sky. They painted their bodies with colours from nature to signal aggression toward an enemy, or to make themselves attractive to a mate.A girl and a rainbow of crushed ice flavors at Chowpatty Beach, India. Over the centuries, the sources of colours such as blue, purple, and red were high valued and they were often  worth as much as gold.  In the 19th century, a young chemistry student manufactured the first synthetic dye, and suddenly the world became a much more colorful place. In the 20th century, scientists discovered the psychological effects of colours, and people found ways to use this discovery to influence our feelings and behaviors.REDRed, colour of blood, symbolises fire, love and anger. In Eastern cultures, people believe it brings luck, wealth and success. In humans, the color red can send different messages. Some people redden, for example, when they are angry or embarrassed.  Researchers have discovered that in sports the team that is wearing red is more likely to win. Why? Because red seems to be the color that signals dominance, giving those dressed in red an advantage in sporting  events. In many animal species (including humans), contact with this bold color causes the heart rate to increase. However, one of red’s lighter shades, pink, can have the opposite effect on people. Man in prisons are less agressive when the walls are a specific shade of pink.YELLOWYellow, the colour that comes to mind when we think of sunshine, is found throughout nature and the man-made world as a colour that commands attention; indeed, it is one of the easiest colours to see. This highly visible shade is found on everything from school buses to traffic signs and pens that we use to highlight important information in a text. The colour is also used to caution people; football players, for example, are shown a yellow card as a reminder to behave. It can be used as a stimulant as well: in a number of studies, yellow has been found to help children focus on their work and do better at school.BLUEBlue, the colour of the sky and sea, is associated in many cultures with water, religious objects, and protection against evil. Its darker shades represent calm, stability and power. Dark blue, for example, is the colour of the business suit or police uniform; it tells others, ‘I am in control,’ or ‘I am trustworthy.’ Blue is also associated with sadness. It’s common in English, for example, when you are feeling sad or depressed, to talk about ‘feeling blue,’ while in Iran, blue is the colour of mourning, worn when a person dies. Like pink, blue has a calming effect on people. Rooms painted blue help people to relax or sleep. Sleeping pills are often coloured blue to suggest exactly this idea. This colour also seems to reduce feelings of hunger. Blue food is rarely seen in nature, and when it is, such food is usually no longer healthy to consume. It’s just one more example of the power that colour can hold over us.The phrase “this idea” refers to  _____________.

Xem chi tiết 737 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 questionsIn this era of increased global warming and diminishing fossil fuel supplies, we must begin to put a greater priority on harnessing alternative energy sources. Fortunately, there are a number of readily available, renewable resources that are both cost- effective and earth – friendly. Two such resources are solar power and geothermal powerSolar energy, which reaches the earth through sunlight, is so abundant that it could meet the needs of worldwide energy consumption 6,000 times over. And solar energy is easily harnessed through the use of photovoltaic cells that convert sunlight to electricity. In theUSalone, more than 100, 000 homes are equipped with solar electric systems in the form of solar panels or solar roof tiles. And in other parts of the world, including many developing countries, the use of solar system is growing steadilyAnother alternative energy source, which is abundant in specific geographical areas, is geothermal power, which creates energy by tapping heat from below the surface of the earth. Hot water and steam that are trapped in underground pools are pumped to the surface and used to run a generator, which is produces electricity. Geothermal energy is 50, 000 times more abundant than the entire known supply of fossil fuel resources. And as with solar power, the technology needed to utilize geothermal energy is fairly simple. A prime example of effective geothermal use inIceland, a region of high geothermal activity where over 80 percent of private homes are heated by geothermal power.Solar and geothermal energy are  just two of promising renewable alternatives to conventional energy sources. The time is long overdue to invest in the development and use of alternative energy on global scaleWhat does the author imply about alternative energy sources ?

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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 55 to 64Genetics is the study of hereditary characteristics that are passed down from one generation of living organisms to another. Although farmers have used selective breeding to improve the resilience of crops and animals, it wasn't until the mid 1800s that Gregor Mendel started the science of genetics as we know it today. Following Mendel's methods, scientists have discovered "chromosomes" and "DNA". With the ability to study DNA, scientists were ableto study the genetic differences between races.Modern genetics discovered that all humans are descendants of "Mitochondrial Eve," a woman who lived over 150,000 years ago in Africa. Since the first humans were born, over 75,000 generations have passed, and many subtle differences are now evident. Humans share at least 99% of their genetic makeup. A 1% difference may not seem like much, but when you consider that a chimpanzee shares 98% of human genes, you realize how much a 1% difference makes!Africans are more closely related to Europeans than any other two groups, despite the fact that they differ so much in appearance. The biggest genetic differences are found between Africans and the native populations of NorthAmerica (22%). However, it is essential to note that the genetic differences between people of the same race are much greater than the differences between people of different races. This means that the argument which claims that genetic differences make one race superior to another is nothing but a tall story.The differences in various populations may also be the result of circumstances rather than genetic makeup. Factors such as climate, diet, health care, education, and employment as well as other socioeconomic factors are all influential. However, there are some traits which are genetic; for example, there is a much higher incidence of sickle-cell anemia among black populations than any other population group. Adult African-Americans and Latinos have twice as many cases of diabetes than Caucasians. In the U.S., Latinos suffer more deaths from liver disease than other races. Europeans suffer more from heart disease and cancer.Genes not only affect our susceptibility to disease, they also affect our physical attributes. The Dinka people from the Sudan are considered to be the tallest people with men having an average height of 6ft 3in., while women hit the big time with an impressive 5ft 3in. This contrasts sharply with the Pygmy tribes who get the short end of the stick at only about 4ft 11in.tall. Genetic differences may help us to tailor health services to people of different races or to detect life threatening diseases early. However, they are not significant enough to support the claim that one race is superior toanother. In fact, our modern scientific understanding of human genetic diversity flies in the face of almost all our social stereotypesWhere do the greatest genetic differences occur?

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