单选题Although many people would not believe it, the mosquito is actually the most dangerous animal in Africa. While the bite of the black mamba is invariably lethal when untreated, this dreaded snake kills only a few dozen people per year. Hippopotami, with their immense strength and foul dispositions, kill hundreds of people per year in rivers and lakes, but the mosquito is still more dangerous. Mosquitoes bite hundreds of millions of people in Africa every year, and they infect over a million each year with malaria, a disease that is often fatal. Which of the following questions would be most useful in evaluating the claim made above regarding the mosquito?ACould a person survive an attack by a black mamba if that person received prompt medical attention?BWhat criteria are used to determine which animal is the “most dangerous” animal?CCould the incidence of mosquito bites be decreased through the judicious use of pesticides and insect repellent?DDoes malaria kill more people per year in Africa than tuberculosis?EHow does the percentage of people who survive hippopotamus attacks in Africa each year compare with the percentage of people who survive mosquito bites?
单选题
Although many people would not believe it, the mosquito is actually the most dangerous animal in Africa. While the bite of the black mamba is invariably lethal when untreated, this dreaded snake kills only a few dozen people per year. Hippopotami, with their immense strength and foul dispositions, kill hundreds of people per year in rivers and lakes, but the mosquito is still more dangerous. Mosquitoes bite hundreds of millions of people in Africa every year, and they infect over a million each year with malaria, a disease that is often fatal. Which of the following questions would be most useful in evaluating the claim made above regarding the mosquito?
A
Could a person survive an attack by a black mamba if that person received prompt medical attention?
B
What criteria are used to determine which animal is the “most dangerous” animal?
C
Could the incidence of mosquito bites be decreased through the judicious use of pesticides and insect repellent?
D
Does malaria kill more people per year in Africa than tuberculosis?
E
How does the percentage of people who survive hippopotamus attacks in Africa each year compare with the percentage of people who survive mosquito bites?
参考解析
解析：
文段中对于非洲蚊子的结论是：“the mosquito is actually the most dangerous animal in Africa.”，之后作者比较了蚊子和其他生物的致死率的数据，故B问题能更好的帮助我们估计这一结论，故本题选B。
文段中对于非洲蚊子的结论是：“the mosquito is actually the most dangerous animal in Africa.”，之后作者比较了蚊子和其他生物的致死率的数据，故B问题能更好的帮助我们估计这一结论，故本题选B。
相关考题：
People are confused in their attempts to control malaria in Europe in the early 1900s, because scientists ______.A．identified only one mosquito species instead of six speciesB．thought only three mosquito species transmitted diseaseC．thought there was only one mosquito speciesD．did not know what species was being studied
共用题干Craig Rogers was sitting on his surfboard, scanning（审视）the distance for his next wave, when his board suddenly stopped moving._________(46)"I could have touched its eye with my elbow（肘部）,"says Craig. The shark had surfaced so quietly that he hadn't heard a thing.In his horror and confusion,he waved his arms and accidentally cut two of his fingers on the shark's teeth.He then slid off the opposite side of his surfboard into the water. Then,with Craig in the water and blood flowing from his fingers,the five-meter-long shark simply swam away,_______(47)Although sharks are often categorized as killers that hunt and eat as many humans as they can, this is actually inaccurate.Sharks very rarely kill humans.A person has a greater chance of being struck by lightning or drowning（淹死）in a bath than of being killed by a shark. Only 74 people have been reported killed by great whites in the last century.But great white sharks can reach six meters in length and weigh 2,200 kilograms or more.With frightening jaws that can hold up to3,000 teeth arranged in several rows,they could very easily kill and eat a helpless human in the water.________(48)Shark researchers are trying to comprehend the reasons that allow people to escape without being eaten.The most common explanation is that great whites don't see well._________(49)There is reason to doubt this,however. Recent information shows that great whites can actually see very well. Also,when attacking seals,great whites shoot up to the surface and bite with great force.When approaching humans,however,_________(50)They soon discover that humans are not a high一fat meal."They spit us out because we're too bony,"says Aidan Martin,director of Reef Quest Center for Shark Research.Shark researchers like Martin hypothesize that great whites are actually curious animals that like to investigate things.It's possible that they use their bite not only to kill and eat,but also to gather information.Although such an experience is unlucky for people like Craig Rogers,when sharks bite surfboards or other objects or people,they are likely just trying to learn what they are._________（50）A:disappearing into the water below.B:Why is it,then,that most people survive attacks by great whites?C:they most often move in slowly and bite less hard.D:There is reason to doubt that great whites see well enough to attack humans.E:It has been thought that they mistake people for the seals or sea lions which make up a large part of their diet.F:He looked down and was terrified to see a great white shark biting the front of his board.
共用题干Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earth- quakes.The largest,a magnitude（量）5.6 quake,shook thousands of fans in a college football stadium, caused cracks in a few buildings and scared many people who had never felt a quake before.Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the US Geological Survey(USGS)estimate that several million earthquakes occur globally each year. That may sound scary,but people don't feel many of them because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and others have a very small magnitude.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers（地震仪）.These devices detect and measure the size of ground vibrations（震颤）produced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas.The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth ' s tectonic plates（构造板块）.Tectonic plates are huge pieces of Earth ' s crust（外壳）,sometimes many kilometers thick. Often, edges of these plates temporarily lock together. When plates push and scrape（擦）past each other earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble（轰轰作响）through portions of the landscape far from a plate ' s edges.Although less expected,these"mid-plate"small earthquakes can do substantial damage.Some of the biggest known examples hit the eastern half of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.Few earthquakes happen without people'S awareness.A:RightB:WrongC:Not mentioned
共用题干Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earth- quakes.The largest,a magnitude（量）5.6 quake,shook thousands of fans in a college football stadium, caused cracks in a few buildings and scared many people who had never felt a quake before.Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the US Geological Survey(USGS)estimate that several million earthquakes occur globally each year. That may sound scary,but people don't feel many of them because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and others have a very small magnitude.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers（地震仪）.These devices detect and measure the size of ground vibrations（震颤）produced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas.The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth ' s tectonic plates（构造板块）.Tectonic plates are huge pieces of Earth ' s crust（外壳）,sometimes many kilometers thick. Often, edges of these plates temporarily lock together. When plates push and scrape（擦）past each other earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble（轰轰作响）through portions of the landscape far from a plate ' s edges.Although less expected,these"mid-plate"small earthquakes can do substantial damage.Some of the biggest known examples hit the eastern half of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.The earthquake is the most unpredictable natural disaster.A:RightB:WrongC:Not mentioned
While some office jobs would seem boring to many people,there are quite a few jobs that are stimulating,exciting and satisfying.A:hostile B:tediousC:fantastic D:courageous
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共用题干Prolonging Human LifeProlonging human life has increased the size of the human population. Many people alivetoday would have died of childhood diseases if they had been born 100 years ago.Becausemore people live longer,there are more people around at any given time. In fact,it is a decrease in death rates,not an increase in birthrates,that has led to the population explosion.Prolonging human life has also increased the dependency load. In all societies,people who are disabled or too young or too old to work are dependent on the rest of society to provide for them. In hunting and gathering cultures,old people who could not keep up might be left behind to die. In times of famine,infants might be allowed to die because they could not survive if their parents starved,whereas if the parents survived they could have another child. In most contemporary societies,people feel a moral obligation to keep people alive whether they can work or not. We have a great many people today who live past the age at which they want to work or are able to work;we also have rules which require people to retire at a certain age. Unless these people were able to save money for their retirement,some-body else must support them. In the United States many retired people live on social security checks which are so little that they must live in near poverty. Older people have more illness than young or middle-aged people;unless they have wealth or private or government insur-ance,they must often“go on welfare” if they have a serious illness.When older people become senile or too weak and ill to care for themselves,they create grave problems for their families. In the past and in some traditional cultures,they would be cared for at home until they died. Today,with most members of a household working or in school,there is often no one at home who can care for a sick or weak person. To meet this need,a great many nursing homes and convalescent hospitals have been built.These are of-ten profit-making organizations,although some are sponsored by religious and other nonprofit groups.While a few of these institutions are good,most of them are simply“dumping grounds”for the dying in which“care”is given by poorly paid,overworked,and under-skilled personnel.Which of the following best describes the writer's attitude toward most of the nursing homes,and convalescent hospitals?A: Sympathetic.B: Unfriendly.C: Optimistic.D: Critical.
共用题干Prolonging Human Life1.Prolonging human life has increased the size of the human population.Many people alive today would have died of childhood diseases if they had been born 100 years ago.Because more people live longer,there are more people around at any given time.In fact,it is a decrease in death rates,not an increase in birthrates,that has led to the population explosion.2.Prolonging human life has also increased the dependency load.In all societies,people who are disabled or too young or too old to work are dependent on the rest of society to provide for them. In hunting and gathering cultures,old people who could not keep up might be left behind to die.In times of famine,infants might be allowed to die because they could not survive if their parents starved,whereas if the parents survived they could have another child.3.In most contemporary societies,people feel a moral obligation to keep people alive whether they can work or not. We have a great many people today who live past the age at which they want to work or are able to work.We also have rules which require people to retire at a certain age.Unless these people were able to save money for their retirement,somebody else must support them.In the United States many retired people live on social security checks which are so little that they must live in near poverty. Older people have more illness than young or middle-aged people.Unless they have wealth or private or government insurance,they must often"go on welfare"if they have a serious illness.4.When older people become senile or too weak and ill to care for themselves,they create grave problems for their families.In the past and in some traditional cultures,they would be cared for at home until they died.Today,with most members of a household working or in school,there is often no one at home who can care for a sick or weak person.To meet this need,a great many nursing homes and convalescent hospitals have been built. These are often profit-making organizations, although some are sponsored by religious and other nonprofit groups.While a few of these institutions are good,most of them are simply"dumping grounds"for the dying in which"care"is given by poorly paid,overworked,and under-skilled personnel.Many people would have died of_______if they had been born 100 years ago.A:too weak and illB:hunting and gathering culturesC:childhood diseasesD:no one at homeE:epidemic diseases F: traditional cultures
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共用题干Prolonging Human LifeProlonging human life has increased the size of the human population. Many people alivetoday would have died of childhood diseases if they had been born 100 years ago.Becausemore people live longer,there are more people around at any given time. In fact,it is a decrease in death rates,not an increase in birthrates,that has led to the population explosion.Prolonging human life has also increased the dependency load. In all societies,people who are disabled or too young or too old to work are dependent on the rest of society to provide for them. In hunting and gathering cultures,old people who could not keep up might be left behind to die. In times of famine,infants might be allowed to die because they could not survive if their parents starved,whereas if the parents survived they could have another child. In most contemporary societies,people feel a moral obligation to keep people alive whether they can work or not. We have a great many people today who live past the age at which they want to work or are able to work;we also have rules which require people to retire at a certain age. Unless these people were able to save money for their retirement,some-body else must support them. In the United States many retired people live on social security checks which are so little that they must live in near poverty. Older people have more illness than young or middle-aged people;unless they have wealth or private or government insur-ance,they must often“go on welfare” if they have a serious illness.When older people become senile or too weak and ill to care for themselves,they create grave problems for their families. In the past and in some traditional cultures,they would be cared for at home until they died. Today,with most members of a household working or in school,there is often no one at home who can care for a sick or weak person. To meet this need,a great many nursing homes and convalescent hospitals have been built.These are of-ten profit-making organizations,although some are sponsored by religious and other nonprofit groups.While a few of these institutions are good,most of them are simply“dumping grounds”for the dying in which“care”is given by poorly paid,overworked,and under-skilled personnel.According to the passage,which of the following statements about retired people in the United States is true?A: Many of them have a very hard life.B: They cannot live a decent life without enough bank savings.C: They rely mainly on their children for financial support.D: Most of them live with their children and therefore are well looked after.
共用题干Eastern Quakes Can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes. The largest,a magnitude 5 .6 quake,shook thousands of fans in a college football stadium,caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes. If you watch the news on TV,you see reports about all sorts of natural disasters一 hurricanes,tornadoes,flooding and wildfires,to name a few. But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U. S. Geological Survey estimate that several million earthquakes rattie the globe each year. That may sound scary,but people don't feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean, and others have a very small magnitude,or shaking intensity.A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23, 2011,was felt from central Georgia to southeastern Canada. In many urban areas,including Washington,D.C.,and New York City(Wall Street shown),people crowded the streets while engineers inspected buildings.Scientists know about small,remote quakes only because of very sensitive electronic devices called seismometers.These devices detect and measure the size of ground vibrationsproduced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas. The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth's tectonic plates.Tectonic plates are huge pieces of Earth's crust,sometimes many kilometers thick. These plates cover our planet's surface like a jigsaw puzzle. Often,jagged edges of these plates temporarily lock together. When plates jostle and scrape past each other,earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate's edges. Although less expected,these”mid-plate” tremors can do substantial damage. Some of the biggest known examples rattled the eastern half of the United States two centuries ago. Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.The earthquake that hit the eastern half of the United States two centuries ago is the biggest“mid-plate” one in history.A: RightB: WrongC: Not mentioned
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共用题干Eastern Quakes Can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes. The largest,a magnitude 5 .6 quake,shook thousands of fans in a college football stadium,caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes. If you watch the news on TV,you see reports about all sorts of natural disasters一 hurricanes,tornadoes,flooding and wildfires,to name a few. But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U. S. Geological Survey estimate that several million earthquakes rattie the globe each year. That may sound scary,but people don't feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean, and others have a very small magnitude,or shaking intensity.A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23, 2011,was felt from central Georgia to southeastern Canada. In many urban areas,including Washington,D.C.,and New York City(Wall Street shown),people crowded the streets while engineers inspected buildings.Scientists know about small,remote quakes only because of very sensitive electronic devices called seismometers.These devices detect and measure the size of ground vibrationsproduced by earthquakes.Altogether,USGS researchers use seismometers to identify and locate about 20,000 earthquakes each year.Although earthquakes can happen anywhere in the world,really big quakes occur only in certain areas. The largest ones register a magnitude 8 or higher and happen,on average,only once each year. Such big ones typically occur along the edges of Earth's tectonic plates.Tectonic plates are huge pieces of Earth's crust,sometimes many kilometers thick. These plates cover our planet's surface like a jigsaw puzzle. Often,jagged edges of these plates temporarily lock together. When plates jostle and scrape past each other,earthquakes occur. On average,tectonic plates move very slowly一about the same speed as your fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate's edges. Although less expected,these”mid-plate” tremors can do substantial damage. Some of the biggest known examples rattled the eastern half of the United States two centuries ago. Today,scientists are still puzzling over why the quakes occurred and when similar ones might occur.Few earthquakes happen without people's awareness.A: RightB: WrongC: Not mentioned
共用题干Prolonging Human LifeProlonging human life has increased the size of the human population.Many people alive today would have died of childhood diseases if they had been born 100 years ago.Because more people live longer,there are more people around at any given time.In fact,it is a decrease in death rates,not an increase in birthrates,that has led to the population explosion.Prolonging human life has also increased the dependency load.In all societies,people who are disabled or too young or too old to work are dependent on the rest of society to provide for them.In hunting and gathering cultures, old people who could not keep up might be left behind to die.In times of famine,infants might be allowed to die because they could not survive if their parents starved,whereas if the parents survived they could have another child.In most contemporary societies,people feel a moral obligation to keep people alive whether they can work or not.We have a great many people today who live past the age at which they want to work or are able to work;we also have rules which require people to retire at a certain age.Unless these people were able to save money for their retirement,somebody else must support them.In the United States many retired people live on social security checks which are so little that they must live in near poverty.Older people have more illness than young or middle-aged people;unless they have wealth or private or government insurance,they must often"go on welfare"if they have a serious illness.When older people become senile or too weak and ill to care for themselves,they create grave problems for their families.In the past and in some traditional cultures,they would be cared for at home until they died.Today,with most members of a household working or in school,there is often no one at home who can care for a sick or weak person.To meet this need,a great many nursing homes and convalescent hospitals have been built.These are often profit-making organizations,although some are sponsored by religious and other nonprofit groups.While a few of these institutions are good,most of them are simply"dumping grounds"for the dying in which"care"is given by poorly paid,overworked,and underskilled personnel.The writer believes that the population explosion results from______.A:an increase in birthrates B:the industrial developmentC:a decrease in death rates D:cultural advances
共用题干Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes.The largest,a magnitude 5.6 quake,shook thousands of fans in a college football itadium, caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters一hurricanes,tornadoes,flooding and wildfires,to name a few.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U.S.Geological Survey estimate that several million earthquakes rattle the globe eachyear. That mnay sound scary,but people don'I feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and othlers have a very small magnitude,or shaking intensity..A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23,2011,was felt from central Georgia to southeastern Canada.In iilany urbanl areas,including Washington,D.C.,dnd New York City(Wall Street shown),people crowded the streets while engineer inspected buildings.Credit: Wikimnedia/Alex Tahak.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers.These devices detect and measure the size of ground vibrations produced by earthquakes. Altogether,USGS researchers use seismornetero to identify and locate about 20,000 earthquakseach year.Although earthquakes can happen anywhere in the world,really big quakeg occur only in。erttiin areas.The largest ones register a magnitude S or higher and happen, on average,only once each year. Such big ones typically occur along the edges of Earth’s tectonic plates.Tectonic plates are huge pieces of Earth’s crust,sornetinies many kilometers thick.These plates cover our planet'ssurface ike a jigsaw puzzle.Often,jagged edges of these plates temporarily lock together. When riates jostle and serape past each other earthquakes occur. On。、crage,tectonic plates move very slowly一 about the same speed as sour fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate'S edges.Although less cxpcctcd,these"mid-plate"tremors can do substontaI damage,Some of the biggest known examples rattled the eastern haif of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones nught occur.Few earthquakes happen without people’s awareness.A:RightB:WrongC:Not mentioned
共用题干Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes.The largest,a magnitude 5.6 quake,shook thousands of fans in a college football itadium, caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters一hurricanes,tornadoes,flooding and wildfires,to name a few.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U.S.Geological Survey estimate that several million earthquakes rattle the globe eachyear. That mnay sound scary,but people don'I feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and othlers have a very small magnitude,or shaking intensity..A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23,2011,was felt from central Georgia to southeastern Canada.In iilany urbanl areas,including Washington,D.C.,dnd New York City(Wall Street shown),people crowded the streets while engineer inspected buildings.Credit: Wikimnedia/Alex Tahak.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers.These devices detect and measure the size of ground vibrations produced by earthquakes. Altogether,USGS researchers use seismornetero to identify and locate about 20,000 earthquakseach year.Although earthquakes can happen anywhere in the world,really big quakeg occur only in。erttiin areas.The largest ones register a magnitude S or higher and happen, on average,only once each year. Such big ones typically occur along the edges of Earth’s tectonic plates.Tectonic plates are huge pieces of Earth’s crust,sornetinies many kilometers thick.These plates cover our planet'ssurface ike a jigsaw puzzle.Often,jagged edges of these plates temporarily lock together. When riates jostle and serape past each other earthquakes occur. On。、crage,tectonic plates move very slowly一 about the same speed as sour fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate'S edges.Although less cxpcctcd,these"mid-plate"tremors can do substontaI damage,Some of the biggest known examples rattled the eastern haif of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones nught occur.The earthquake that hit the eastern half of the United States two centuries ago is the biggest"mid-plate"one in history.A:RightB:WrongC:Not mentioned
共用题干Eastern Quakes can Trigger Big ShakesIn the first week of November 2011,people in central Oklahoma experienced more than two dozen earthquakes.The largest,a magnitude 5.6 quake,shook thousands of fans in a college football itadium, caused cracks in a few buildings and rattled the nerves of many people who had never felt a quake before. Oklahoma is not an area of the country famous for its quakes.If you watch the news on TV,you will see reports about all sorts of natural disasters一hurricanes,tornadoes,flooding and wildfires,to name a few.But the most dangerous type of natural disaster,and also the most unpredictable,is the earthquake.Researchers at the U.S.Geological Survey estimate that several million earthquakes rattle the globe eachyear. That mnay sound scary,but people don'I feel many of the tremors because they happen in remote and unpopulated regions.Many quakes happen under the ocean,and othlers have a very small magnitude,or shaking intensity..A magnitude 5.8 earthquake that struck central Virginia the afternoon of August 23,2011,was felt from central Georgia to southeastern Canada.In iilany urbanl areas,including Washington,D.C.,dnd New York City(Wall Street shown),people crowded the streets while engineer inspected buildings.Credit: Wikimnedia/Alex Tahak.Scientists know about small,remote quakes only because of very sensitive electronic devices called seis- mometers.These devices detect and measure the size of ground vibrations produced by earthquakes. Altogether,USGS researchers use seismornetero to identify and locate about 20,000 earthquakseach year.Although earthquakes can happen anywhere in the world,really big quakeg occur only in。erttiin areas.The largest ones register a magnitude S or higher and happen, on average,only once each year. Such big ones typically occur along the edges of Earth’s tectonic plates.Tectonic plates are huge pieces of Earth’s crust,sornetinies many kilometers thick.These plates cover our planet'ssurface ike a jigsaw puzzle.Often,jagged edges of these plates temporarily lock together. When riates jostle and serape past each other earthquakes occur. On。、crage,tectonic plates move very slowly一 about the same speed as sour fingernails grow.But sometimes earthquakes rumble through portions of the landscape far from a plate'S edges.Although less cxpcctcd,these"mid-plate"tremors can do substontaI damage,Some of the biggest known examples rattled the eastern haif of the United States two centuries ago.Today,scientists are still puzzling over why the quakes occurred and when similar ones nught occur.The earthquake is the most unpredictable natural disaster.A:RightB:WrongC:Not rnentioned
单选题Ellsworth Huntington decided that climate and temperature have _____.Aa great effect on everyone’s intelligenceBsome effect on most people’s intelligenceCsome effect on a few people’s intelligenceDno effect on most people’s intelligence
单选题There were many people present and he appeared only for a few seconds, so I only caught a （）of him.AglanceBglimpseClookDsight
单选题There would be many more organ donors if ______.Alaws are designed to encourage organ recyclingBonly a few people become organ donorsCdoctors are more willing to ask for donationsDtransplant surgery is more successful
问答题Practice 2 “To be a Negro in America is to hope against hope,” wrote Martin Luther King in the last year Of his life. The advance the black man in the United States, from the position of slave to that of proud and equal citizen, is slow. The black man’s hopes have often ended in despair. “Of the good things in life he has about one-half those Of whites；Of the bad he has twice those Of whites, ”wrote Dr. King. Half of all black people lived in poor houses. They’re received about half as much pay as whites. They had twice as many of their people out Of work and twice as many babies dead for lack Of proper care. Allowing for their numbers, twice as many black men as white fought in the war in Vietnam, and twice as many died in that war. Most black people sti11 did work that was unpleasant and poorly paid. That was the only work they could get.(from Great People of Our Time, ed., by Carol Christian Macmillan Education,1977)
单选题The mere fact ______ most people believe a nuclear war would be mad does not mean that it will not occur.AwhatBwhichCthatDwhy
单选题Why is a “selling panic” much less likely in the housing market?ABecause most houses are primary residences.BBecause people have locked in low mortgaged rates.CBecause people could only qualify for smaller mortgages.DBecause people don’t believe housing market would crash.
单选题The mere fact______most people believe a nuclear war would be mad does not mean that it will not occur.AwhatBwhichCthatDwhy
问答题Culture is not just a matter of language; it involves the intellect, emotions, and—to me the most important of all—our senses. It is our instinctive responses that invariably reveal our cultural affiliations. Language is one obvious indicator; few people would shout out sudden pain and pleasure in a second language. But there are clear non-linguistic indicators as well, one of the most important being our preferences for food, particularly when feel unwell. All these can perhaps be summed up as “gut feelings”. Since these are responses uncamouflaged by our own or other people’s, manipulation and wishful thinking, they are very reliable.My two worlds not only sounded different, but also had different smells, textures and each moved to different rhythm. I was intrigued by the tangibility of that difference. It was like looking at two paintings, one a traditional Chinese landscapes, the other an impressionist work. Only I wasn’t just looking at them, I was living in a both of them simultaneously.
问答题“To be a Negro in America is to hope against hope,” wrote Martin Luther King in the last year of his life. The advance the black man in the United States, from the position of slave to that of proud and equal citizen, is slow. The black man’s hopes have often ended in despair.“Of the good things in life he has about one-half those of whites; of the bad he has twice those of whites,” wrote Dr. King. Half of all black people lived in poor houses. They have received about half as much pay as whites. They had twice as many of their people out of work and twice as many babies dead for lack of proper care. Allowing for their numbers, twice as many black men as white fought in the war in Vietnam, and twice as many died in that war. Most black people still did work that was unpleasant and poorly paid. That was the only work they could get.