单选题According to the passage, scientists can’t observe some of the earliest steps in brain activity becausee.Athose changes are subtle and masked by some reactionsBsubtle changes in blood flow began earlierCthe imaging techniques are out of placeDthe flow of blood to increase to an area of the brain is slow
单选题
According to the passage, scientists can’t observe some of the earliest steps in brain activity becausee.
A
those changes are subtle and masked by some reactions
B
subtle changes in blood flow began earlier
C
the imaging techniques are out of place
D
the flow of blood to increase to an area of the brain is slow
参考解析
解析：
细节题。文章第一段提到“Scientists…have been missing some of the earliest steps in brain activity because those changes are subtle and are masked by reactions that happen seconds later…”，其中have been missing对应题干中的can’t observe，由此可知选项A为正确答案。
细节题。文章第一段提到“Scientists…have been missing some of the earliest steps in brain activity because those changes are subtle and are masked by reactions that happen seconds later…”，其中have been missing对应题干中的can’t observe，由此可知选项A为正确答案。
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共用题干Facts about Stroke1 Every 45 seconds,someone in America has a stroke.Every 3. 1 minutes,someonedies of one.Stroke killed an estimated 167,661 people in 2000 and is the nation's thirdleading cause of death,ranking behind diseases of the heart and all forms of cancer. Stroke is a leading cause of serious,long-term disability in the United States.2 Stroke is a type of cardiovascular（心血管的）disease. It affects the arteries（动脉）leading to and within the brain.A stroke occurs when a blood vessel that carries oxygenand nutrients（营养物）to the brain is either blocked by a clot（凝块）or bursts. Whenthat happens,part of the brain cannot get the blood(and oxygen)it needs,so it startsto die.3 The brain is an extremely complex organ that controls various body functions.If a strokeoccurs and blood flow can't reach the region that controls a particular body function,thatpart of the body won't work as it should,If the stroke occurs toward the back of the brain,for instance,It's likely to result in some disablity involving vision.The effects of a strokedepend primarily on the location of the obstruction（阻塞）and the extent of brain tissueaffected.4 The American Stroke Association has identified several factors that increase the risk ofstroke.The more risk factors a person has,the greater the chance that he or she will havea stroke.Some of these you can't control,such as increasing age,family health history, race,and prior stroke.But you can change or treat other risk factors to lower your risk.Factors resulting from lifestyle or environment can be modified with a healthcare provider's help.Some of these include:high blood pressure,current smoking,heart disease,andhigh red blood cell count.5 A stroke can happen to anyone at any moment.In fact about 600,000 people havestrokes every year. For many years,there was no hope for those suffering a stroke.However,recent breakthroughs have led to new treatments.For the treatments to work,the person must get to a hospital immediately. A person's vision is likely to be affected if a stroke________.A:suffer from a strokeB:will be affectedC:change their lifestylesD:will take placeE:occurs at the back of his/her brainF:controls various body functions
共用题干第三篇 Smart ExerciseDoctors are starting to find more and more information that suggests a connection between exercise and brain development.Judy Cameron,a scientist at Oregon Health and Science University,studies brain development.According to her research,it seems that exercise can make blood vessels,including those in the brain,stronger and more fully developed.Dr. Cameron claims this allows people who exercise to concentrate better. As she says:"While we already know that exercise is good for the heart,exercise can literally cause physical changes in the brain."The effects of exercise on brain development can even be seen in babies.Babies who do activities that require a lot of movement and physical activity show greater brain development than babies who are less physically active.With babies,even a{ittle movement can show big results. Margaret Barnes , a pediatrician（儿科医师）,believes in the importance of exercise.She thinks that many learning disabilities that children have in elementary school or high school can be traced back to a lack of movement as babies. "Babies need movement that stimulates their five senses.They need to establish a connection between motion and memory.In this way,as they get older,children will begin to associate physical activity with higher learning,"says Margaret. Older people can beef up their brains as well.Cornell University studied a group of seniors ranging in age from seventy to seventy-nine. Their study showed a short-term memory increase of up to 40 percent after exercising just three hours a week.The exercise does not have to be very difficult,but it does have to increase the heart rate.Also,just like the motion for infants,exercise for older people should involve some complexity.Learning some new skills or motions helps to open up memory paths in the brain that may not havebeen used for a long time.For most people,any type of physical activity that increases the heart rate is helpful. The main goal is to increase the brain's flow of blood.And your brain can benefit from as little as two to three hours of exercise a week. To be beneficial,exercise for older people shouldA:be done in a group. B: be done on a daily basis.C: involve great difficulty. D:increase the heart rate.
共用题干第三篇 Smart ExerciseDoctors are starting to find more and more information that suggests a connection between exercise and brain development.Judy Cameron,a scientist at Oregon Health and Science University,studies brain development.According to her research,it seems that exercise can make blood vessels,including those in the brain,stronger and more fully developed.Dr. Cameron claims this allows people who exercise to concentrate better. As she says:"While we already know that exercise is good for the heart,exercise can literally cause physical changes in the brain."The effects of exercise on brain development can even be seen in babies.Babies who do activities that require a lot of movement and physical activity show greater brain development than babies who are less physically active.With babies,even a{ittle movement can show big results. Margaret Barnes , a pediatrician（儿科医师）,believes in the importance of exercise.She thinks that many learning disabilities that children have in elementary school or high school can be traced back to a lack of movement as babies. "Babies need movement that stimulates their five senses.They need to establish a connection between motion and memory.In this way,as they get older,children will begin to associate physical activity with higher learning,"says Margaret. Older people can beef up their brains as well.Cornell University studied a group of seniors ranging in age from seventy to seventy-nine. Their study showed a short-term memory increase of up to 40 percent after exercising just three hours a week.The exercise does not have to be very difficult,but it does have to increase the heart rate.Also,just like the motion for infants,exercise for older people should involve some complexity.Learning some new skills or motions helps to open up memory paths in the brain that may not havebeen used for a long time.For most people,any type of physical activity that increases the heart rate is helpful. The main goal is to increase the brain's flow of blood.And your brain can benefit from as little as two to three hours of exercise a week. Research by Dr.Cameron seems to suggest that exercise canA: generate new blood vessels. B:change the way a person thinks.C: promote brain development. D: divert one's attention.
共用题干第二篇Exercise and BrainJust as exercise strengthens the heart and lungs,bones and muscles,it may also power up the brain.A succession of scientific studies of animals implies that physical activity has a positive effect on mental functioning."It's clear that the brain benefits from exercise,"says brain scientist William Greenough of the University of Illinois at Urbana-Champaign.His studies with rats have demonstrated two primary effects of activity:Vigorous physical exercise provides the brain with more fuel,and skill-based ex-ercise increases the formation of connections in the brain, which, according to the proposals of some scientists,may make the brain better able to process information.In one experiment,laboratory rats were separated into three groups.One group was exercised by running inside an automatic wheel,a second group improved their skills in a complicated obstacle course,and a third group was inactive."The animals that learned to go through the obstacle course exhibited a greater number of brain connections than the animals in the exercised or inactive groups,"Greenough said."In contrast, the animals that exercised inside the automatic wheel possessed a greater density of blood vessels in the brain than did either of the other two groups of animals."Learning a new dance step may boost the brain in the same way that learning a language can, he says.And if the dance is a good physical exercise as well,the benefits multiply.Young brains may be especially able to boost brain power through exercise,suggested another of Greenough's experiments that showed the most significant changes in the brain occurred among rats that had been exercised when very young.And while animals aren't people,he says it is logical to make the inference that an effect found in rats may also apply to humans.Human studies have focused primarily on older adults and suggest that regular exercise can improve the speed with which the brain processes information.Measurements made by Arthur Kramer at the University of Illinois demonstrated that inactive adults,aged 63 to 82,could hit buttons faster in response to a tone after they went through a 10-week water exercise course.A corresponding control group that didn't exercise showed no improvement.According to the passage what is not the advantage of physical exercises?A:do good to our mental health. B:strengthen our hearts and lungs.C:strengthen our bones and muscles. D:help us lose weight.
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共用题干Facts about Stroke1 Every 45 seconds,someone in America has a stroke.Every 3. 1 minutes,someonedies of one.Stroke killed an estimated 167,661 people in 2000 and is the nation's thirdleading cause of death,ranking behind diseases of the heart and all forms of cancer. Stroke is a leading cause of serious,long-term disability in the United States.2 Stroke is a type of cardiovascular（心血管的）disease. It affects the arteries（动脉）leading to and within the brain.A stroke occurs when a blood vessel that carries oxygenand nutrients（营养物）to the brain is either blocked by a clot（凝块）or bursts. Whenthat happens,part of the brain cannot get the blood(and oxygen)it needs,so it startsto die.3 The brain is an extremely complex organ that controls various body functions.If a strokeoccurs and blood flow can't reach the region that controls a particular body function,thatpart of the body won't work as it should,If the stroke occurs toward the back of the brain,for instance,It's likely to result in some disablity involving vision.The effects of a strokedepend primarily on the location of the obstruction（阻塞）and the extent of brain tissueaffected.4 The American Stroke Association has identified several factors that increase the risk ofstroke.The more risk factors a person has,the greater the chance that he or she will havea stroke.Some of these you can't control,such as increasing age,family health history, race,and prior stroke.But you can change or treat other risk factors to lower your risk.Factors resulting from lifestyle or environment can be modified with a healthcare provider's help.Some of these include:high blood pressure,current smoking,heart disease,andhigh red blood cell count.5 A stroke can happen to anyone at any moment.In fact about 600,000 people havestrokes every year. For many years,there was no hope for those suffering a stroke.However,recent breakthroughs have led to new treatments.For the treatments to work,the person must get to a hospital immediately. When a stroke occurs,the arteries leading to and within the brain______.A:suffer from a strokeB:will be affectedC:change their lifestylesD:will take placeE:occurs at the back of his/her brainF:controls various body functions
共用题干第二篇Exercise and BrainJust as exercise strengthens the heart and lungs,bones and muscles,it may also power up the brain.A succession of scientific studies of animals implies that physical activity has a positive effect on mental functioning."It's clear that the brain benefits from exercise,"says brain scientist William Greenough of the University of Illinois at Urbana-Champaign.His studies with rats have demonstrated two primary effects of activity:Vigorous physical exercise provides the brain with more fuel,and skill-based ex-ercise increases the formation of connections in the brain, which, according to the proposals of some scientists,may make the brain better able to process information.In one experiment,laboratory rats were separated into three groups.One group was exercised by running inside an automatic wheel,a second group improved their skills in a complicated obstacle course,and a third group was inactive."The animals that learned to go through the obstacle course exhibited a greater number of brain connections than the animals in the exercised or inactive groups,"Greenough said."In contrast, the animals that exercised inside the automatic wheel possessed a greater density of blood vessels in the brain than did either of the other two groups of animals."Learning a new dance step may boost the brain in the same way that learning a language can, he says.And if the dance is a good physical exercise as well,the benefits multiply.Young brains may be especially able to boost brain power through exercise,suggested another of Greenough's experiments that showed the most significant changes in the brain occurred among rats that had been exercised when very young.And while animals aren't people,he says it is logical to make the inference that an effect found in rats may also apply to humans.Human studies have focused primarily on older adults and suggest that regular exercise can improve the speed with which the brain processes information.Measurements made by Arthur Kramer at the University of Illinois demonstrated that inactive adults,aged 63 to 82,could hit buttons faster in response to a tone after they went through a 10-week water exercise course.A corresponding control group that didn't exercise showed no improvement.According to passage,what can not boost the brain?A:A new dance step.B:A dance which is a good physical exercise as well.C:Running on an automatic wheel.D:Being inactive inside.
共用题干Facts about Stroke1 Every 45 seconds,someone in America has a stroke.Every 3. 1 minutes,someonedies of one.Stroke killed an estimated 167,661 people in 2000 and is the nation's thirdleading cause of death,ranking behind diseases of the heart and all forms of cancer. Stroke is a leading cause of serious,long-term disability in the United States.2 Stroke is a type of cardiovascular（心血管的）disease. It affects the arteries（动脉）leading to and within the brain.A stroke occurs when a blood vessel that carries oxygenand nutrients（营养物）to the brain is either blocked by a clot（凝块）or bursts. Whenthat happens,part of the brain cannot get the blood(and oxygen)it needs,so it startsto die.3 The brain is an extremely complex organ that controls various body functions.If a strokeoccurs and blood flow can't reach the region that controls a particular body function,thatpart of the body won't work as it should,If the stroke occurs toward the back of the brain,for instance,It's likely to result in some disablity involving vision.The effects of a strokedepend primarily on the location of the obstruction（阻塞）and the extent of brain tissueaffected.4 The American Stroke Association has identified several factors that increase the risk ofstroke.The more risk factors a person has,the greater the chance that he or she will havea stroke.Some of these you can't control,such as increasing age,family health history, race,and prior stroke.But you can change or treat other risk factors to lower your risk.Factors resulting from lifestyle or environment can be modified with a healthcare provider's help.Some of these include:high blood pressure,current smoking,heart disease,andhigh red blood cell count.5 A stroke can happen to anyone at any moment.In fact about 600,000 people havestrokes every year. For many years,there was no hope for those suffering a stroke.However,recent breakthroughs have led to new treatments.For the treatments to work,the person must get to a hospital immediately. Some people can reduce their risk of stroke if they_______.A:suffer from a strokeB:will be affectedC:change their lifestylesD:will take placeE:occurs at the back of his/her brainF:controls various body functions
共用题干第二篇Exercise and BrainJust as exercise strengthens the heart and lungs,bones and muscles,it may also power up the brain.A succession of scientific studies of animals implies that physical activity has a positive effect on mental functioning."It's clear that the brain benefits from exercise,"says brain scientist William Greenough of the University of Illinois at Urbana-Champaign.His studies with rats have demonstrated two primary effects of activity:Vigorous physical exercise provides the brain with more fuel,and skill-based ex-ercise increases the formation of connections in the brain, which, according to the proposals of some scientists,may make the brain better able to process information.In one experiment,laboratory rats were separated into three groups.One group was exercised by running inside an automatic wheel,a second group improved their skills in a complicated obstacle course,and a third group was inactive."The animals that learned to go through the obstacle course exhibited a greater number of brain connections than the animals in the exercised or inactive groups,"Greenough said."In contrast, the animals that exercised inside the automatic wheel possessed a greater density of blood vessels in the brain than did either of the other two groups of animals."Learning a new dance step may boost the brain in the same way that learning a language can, he says.And if the dance is a good physical exercise as well,the benefits multiply.Young brains may be especially able to boost brain power through exercise,suggested another of Greenough's experiments that showed the most significant changes in the brain occurred among rats that had been exercised when very young.And while animals aren't people,he says it is logical to make the inference that an effect found in rats may also apply to humans.Human studies have focused primarily on older adults and suggest that regular exercise can improve the speed with which the brain processes information.Measurements made by Arthur Kramer at the University of Illinois demonstrated that inactive adults,aged 63 to 82,could hit buttons faster in response to a tone after they went through a 10-week water exercise course.A corresponding control group that didn't exercise showed no improvement.Which statement is correct according to the passage?A:The effect of exercises found in rats can not apply to people.B:Changes in the brain occurred among young rats are more significant than those among adult rats.C:Regular exercise can only improve the speed with which the older adults' brain processes information.D:The author encourages people do more skill-based exercise instead of vigorous physical exercise.
共用题干第三篇 Smart ExerciseDoctors are starting to find more and more information that suggests a connection between exercise and brain development.Judy Cameron,a scientist at Oregon Health and Science University,studies brain development.According to her research,it seems that exercise can make blood vessels,including those in the brain,stronger and more fully developed.Dr. Cameron claims this allows people who exercise to concentrate better. As she says:"While we already know that exercise is good for the heart,exercise can literally cause physical changes in the brain."The effects of exercise on brain development can even be seen in babies.Babies who do activities that require a lot of movement and physical activity show greater brain development than babies who are less physically active.With babies,even a{ittle movement can show big results. Margaret Barnes , a pediatrician（儿科医师）,believes in the importance of exercise.She thinks that many learning disabilities that children have in elementary school or high school can be traced back to a lack of movement as babies. "Babies need movement that stimulates their five senses.They need to establish a connection between motion and memory.In this way,as they get older,children will begin to associate physical activity with higher learning,"says Margaret. Older people can beef up their brains as well.Cornell University studied a group of seniors ranging in age from seventy to seventy-nine. Their study showed a short-term memory increase of up to 40 percent after exercising just three hours a week.The exercise does not have to be very difficult,but it does have to increase the heart rate.Also,just like the motion for infants,exercise for older people should involve some complexity.Learning some new skills or motions helps to open up memory paths in the brain that may not havebeen used for a long time.For most people,any type of physical activity that increases the heart rate is helpful. The main goal is to increase the brain's flow of blood.And your brain can benefit from as little as two to three hours of exercise a week.The title of the passage implies thatA:only smart people do exercise. B: exercise can be smart or stupid.C:exercise keeps the brain strong. D:it is fashionable to do exercise.
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