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An Australian researcher is urging parents to load up their teenager’s backpack and make them walk to school.
Professor Leon Straker says students who walk or cycle to school are less likely to have back and neck pain. But the study of 1,202 Western Australian 14yearold found that 72% of students travelled to school by car or bus. Straker says the study suggests walking or cycling while carrying a schoolbag helps improve trunk (躯干) and spinal (脊柱的) muscle strength.
This helps reduce back pain because greater muscle strength improves support for the back during load carrying .Despite advocating that parents get their children moving，Straker warns bag load should not exceed (超过) 15% of body weight.
Straker says the study also stresses that neck pain is as common as back pain among young teenagers. This is an area that has been largely ignored，he says，but can be an important indicator of neck pain into adulthood.
For the study，students were asked a series of questions such as how long they carried their bags for，how they carried their schoolbags，the method of travel，and their perceptions(感觉) about the bag’s weight.
Straker says about half of all participants experienced back and neck pain，with slightly more females reporting neck pain. However，the gender (性别) difference may also be due to the fact that females have lower pain tolerance.
Studies from the 1980s found carrying a bag over one shoulder was most common among teenagers. However in this study 85% of participants carried their bag over both shoulders.
Straker believes the change has been driven partly through education campaigns，but also by increasing fashion status of backpacks and improved design.
1.In the opinion of Leon Straker，parents should________.
A．reduce the load of their children’s schoolbags
B．put more books in their children’s schoolbags
C．get their children’s schoolbags ready for school
D．ask their children to walk to school carrying schoolbags
2.If a child weighs 40 kilograms，the weight of his schoolbag should be________.
A．no more than 15 kg
B．less than 6 kg
C．as heavy as 9 kg
D．more than 6 kg
3.We can learn from the passage that________.
A．most of the students in Australia walk to school
B．neck pain is uncommon among young teenagers
C．walking while carrying a backpack helps reduce back pain
D．males are more likely to experience back pain than females
4.According to the passage，what change has taken place since the 1980s?
A．How students carry their schoolbags.
B．How heavy students’ schoolbags are.
C．How students go to school every day.
D．How long students carry their schoolbags for.
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Parents should actively urge their children to______the opportunity to join sports teams.
A. gain admission to B. keep track of
C. take advantage of D. give rise to
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Parents should actively urge their children to______the opportunity to join sports teams.
A. gain admission to B. keep track of
C. take advantage of D. give rise to
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Parents should actively urge their children to _________ the opportunity to join sports teams.
A. gain admission to B. keep track of
C. take advantage of D. give rise to
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According to a team of researchers, an animals' ability to perceive(感知)time is linked to their pace of life.
"Our results lend support to the importance of time perception in animals where the ability to
perceive time in a very short time may be the difference between life and death for fast moving
creatures." commented lead author Kevin Healy from Trinity College Dublin.
The study was done with a variety of animals using a phenomenon based on the maximum speed of flashes of light an individual can see before the light source is seen as constant. Dogs, for example, have eyes with a refresh rate higher than humans.
One example of this phenomenon at work, the authors say, is the housefly and its ability to avoid being hit. The research showed flies "observe motion in a shorter time than our own eyes can achieve," which allows them to avoid being hit.
Professor Graeme Ruxton of the University of St Andrews in Scotland, who worked jointly(共同地) on the research project, said in a statement, "Having eyes that send updates to the brain at much higher frequencies than our eyes do is of no value if the brain cannot process that information equally quickly. Thus, this work highlights the impressive abilities of even the smallest animal brains. Flies might not be deep thinkers, but they can make good decisions very quickly."
In comparison the tiger beetle(虎甲虫)runs faster than its eyes can keep up, basically becoming blind, which requires it to stop periodically to re-evaluate its prey's(猎物)position.
Our results suggest that time perception offers an as yet unstudied dimension along which
animals can specialize and there is considerable range to study this system in more detail.
1.What is the research mentioned in the passage mainly about?
A. Pace of life of animals. B. Time perception of animals.
C. Lifetime of small animals. D. Impressive abilities of animals.
2.Why can houseflies avoid being hit?
A. They can think very deeply before they act.
B. They can fly much faster than their eyes can keep up.
C. They can process the information as quickly as they receive it.
D. They can send information to brain more quickly than to their eyes.
3.What will a tiger beetle have to do to catch a moving prey?
A. Try to run as fast as it can. B. Prevent itself from becoming blind.
C. Slow down to gain its time perception. D. Stop occasionally to spot the prey again.
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According to a team of researchers, an animals’ ability to perceive(感知)time is linked to their pace of life.
“Our results lend support to the importance of time perception in animals where the ability to perceive time in a very short time may be the difference between life and death for fast moving creatures.” commented lead author Kevin Healy from Trinity College Dublin.
The study was done with a variety of animals using a phenomenon based on the maximum speed of flashes of light an individual can see before the light source is seen as constant. Dogs, for example, have eyes with a refresh rate higher than humans.
One example of this phenomenon at work, the authors say, is the housefly and its ability to avoid being hit. The research showed flies “observe motion in a shorter time than our own eyes can achieve,” which allows them to avoid being hit.
Professor Graeme Ruxton of the University of St Andrews in Scotland, who worked jointly on the research project, said in a statement, “Having eyes that send updates to the brain at much higher frequencies than our eyes do is of no value if the brain cannot process that information equally quickly. Thus, this work highlights the impressive abilities of even the smallest animal brains. Flies might not be deep thinkers, but they can make good decisions very quickly. ”
In comparison, the tiger beetle (虎甲虫）runs faster than its eyes can keep up, basically becoming blind, which requires it to stop periodically to re-evaluate its prey’s (猎物)position.
Our results suggest that time perception offers an as yet unstudied dimension along which animals can specialize and there is considerable range to study this system in more detail.
1.What is the research mentioned in the passage mainly about?
A. Pace of life of animals. B. Time perception of animals.
C. Lifetime of small animals. D. Impressive abilities of animals.
2.What does Kevin Healy’s comment mean in Para. 2?
A. The ability of animals to perceive time depends on their high moving speed.
B. The survival of fast moving animals relies on their ability to perceive time.
C. Animals with quicker pace of life have better perception of time.
D. Animals with poor ability of time perception have a shorter life.
3.Why can houseflies avoid being hit?
A. They can think very deeply before they act.
B. They can fly much faster than their eyes can keep up.
C. They can process the information as quickly as they receive it.
D. They can send information to brain more quickly than to their eyes.
4.What will a tiger beetle have to do to catch a moving prey?
A. Try to run as fast as it can.
B. Prevent itself from becoming blind.
C. Slow down to gain its time perception.
D. Stop occasionally to spot the prey again.
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According to a team of researchers, an animal’s ability to perceive(感知) time is linked to their pace of life.
“Our results lend support to the importance of time perception in animals where the ability to perceive time in a very short time may be the difference between life and death for fast moving creatures.” commented lead author Kevin Healy from Trinity College Dublin.
The study was done with a variety of animals using phenomenon based on the maximum speed of flashes of light an individual can see before the light source is seen as constant. Dogs, for example, have eyes with a refresh rate higher than humans.
One example of this phenomenon at work, the authors say, is the housefly and its ability to avoid being hit. The research showed flies “observe motion In a shorter time than our own eyes can achieve,” which allows them to avoid being hit.
Professor Graeme Ruxton of the University of St Andrews in Scotland, who worked jointly on the research project, said in a statement, “Having eyes that send updates to the brain at much higher frequencies than our eyes do is of no Value if the brain cannot process that information equally quickly. Thus, this work highlights the impressive abilities of even the smallest animal brains. Flies might now be deep thinkers, but they can make good decisions very quickly.”
In comparison, the tiger beetle (虎甲虫) runs faster than its eyes can keep up, basically becoming blind, which requires it to stop periodically to re-evaluate its prey’s(猎物) position.
Our results suggest that time perception offers an as yet unstudied dimension along which animals can specialize and there is considerable range to study this system in more detail.
1.What is the research mentioned in the passage mainly about?
A. Pace of life of animals. B. Time perception of animals.
C. Lifetime of small animals. D. Impressive abilities of animals.
2.What does Kevin Healy’s comment mean in Para. 2?
A. The ability of animals to perceive time depends’ On their high moving speed.
B. The survival of fast moving animals relies on their ability to perceive time.
C. Animals with quicker pace of life have better perception of time.
D. Animals with poor ability of time perception have a shorter life.
3.Why can houseflies avoid being hit?
A. They can think very deeply before they act.
B. They can fly much faster than their eyes can keep up.
C. They can process the information as quickly as they receive it.
D. they can send information to brain more quickly than to their eyes.
4.What will a tiger have to do to catch a moving prey’
A. Try to run as fast as it can.
B. Prevent itself from becoming blind.
C. Slow down to gain its time perception.
D. Stop occasionally to spot the prey again.
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Ants know when an earthquake is about to strike, researchers have discovered. Their behavior changes significantly prior to the quake and they resume normal functioning only a day after it. Gabriele Berberich of the University Duisburg-Essen in Germany presented these findings on Thursday at the European Geosciences Union annual meeting in Vienna according to LiveScience.
Berberich and her colleagues discovered that red wood ants preferred to build their colonies right along active faults in Germany. They counted 15,000 mounds （土堆)）lining the faults. These faults are the places where the earth violently bursts in earthquakes.
Using a special camera that tracked changes in activity. Berberich and her colleagues tracked the ants round the clock for three years, 2016 to 2019. They found that the ants' behavior changed only when the quake was over magnitude （级数）2. There were 10 earthquakes between magnitude 2.0 and 3.2 during this period, and many smaller ones. Humans can also sense quakes of over magnitude 2 only.
According to Berberich, normal ant activity consists of going about collecting food etc,during the day and resting in the night But before an earthquake, the ants didn't go back to their mound in the night and moved around outside it. This strange and abnormal behavior continued till a day after the earthquake, Berberich told a news conference, according to Livescience.
How do ants know an earthquake is coming? Berberich suggested that they could either be picking up changing gas emissions or noting tiny changes in the Earth's magnetic fields （磁场）. "Red wood ants have special cells which can detect changes in carbon dioxide levels. They also have special cells for detecting electromagnetic fields." she said. Berberich and her colleagues are planning to continue the research in areas where there are more and bigger earthquakes
1.What's the meaning of the underlined word "resume" in Paragraph 1?
A.Form. B.Avoid.
C.Recover. D.Improve.
2.What's the function of the first paragraph?
A.To lead to the main topic. B.To describe a new species of ant,
C.To introduce a famous researcher D.To tell how to predict an earthquake.
3.What happens to the ants before an earthquake?
A.They have no appetite. B.They are too excited to rest.
C.They get lost on their way home. D.They refuse to go inside their nests.
4.What can we conclude from the last paragraph?
A.Ants can only detect smaller earthquakes.
B.The result of the research is completely reliable.
C.Ants may have two ways to predict earthquakes.
D.Researchers don't know how ants predict earthquakes.
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Setting up a good example is a must for parents, which can get their kids to look away from iPad and ________ books instead.
A.make allowance for B.make sense of C.take responsibility for D.take pleasure in
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All parents know that one of their most important tasks is to prepare their children for an independent life，but any parent can tell you that it’s hard to let go of your children．That balance between keeping your children safe and allowing them to learn from their own mistakes can be heartbreaking．Years of experience means that parents often do know best，but on the other hand，the young，being less bound by tradition，are often more creative，more able to find new solutions to old problems．Revolutions are led by the young．
Good teachers make the growth of critical （批判性的） thinking easier in their students，only to find that this can lead to a questioning of the teachers’ basic beliefs．Schools encourage parents to become involved，but are often embarrassed when parents have reservations about some of the educational methods being used．Governments encourage unimportant groups to empower themselves in order to participate fully in the development process．And they are often surprised when the new leaders of these groups turn around and attack the policies of that same government．The rebellions （叛逆的）young and the newly unimportant groups are important in social development．They are not necessarily representatives of those they want to represent or not realistic in their demands，but their voices must be heard．
Good parents know that just forbidding particular behaviors does not prevent their children from finding ways to engage in these forbidden activities．Indeed，sometimes the forbidden fruit is more inviting，just because it is not accepted by authority．Parents must work with their children to educate them on the facts，know as much as possible about he lives of their children，provide a good example，encourage more wholesome activities but also support their children when they don’t follow what is expected of them．But the most important point is that they also need to learn how to let go．
1.By saying “Revolutions are led by the young”，the author indicates that young people are more___________________．
A．conventional B．creative
C．realistic D．heartbreaking
2.From the second paragraph we know__________________．
A．the voice of the rebellious young should be heard by the government
B．schools encourage parents to question their education methods
C．movement is satisfied with the new leaders’ attack on the policies
D．teachers’ basic beliefs should be questioned by students
3.In order to educate children well，parents should_________________．
A．forbid particular behaviors in their daily life
B．know as much as possible as their children
C．educate them with facts and expect much of them
D． know them well and set a good example to them
4.From the passage we can learn that the author prefers ___________________．
A．free parenting B．traditional parenting
C．smart parenting D． critical parenting
5.What is the best title of the passage?
A．Teaching Methods – for Teachers and Schools
B．Parents’ Tasks – in Children’s Development
C．Way of Growth – for the Young Groups
D．Letting Go – for Children’s Independent Life