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Sperm whales can produce stronger ultrasonic waves to kill their prey than dolphins.
A．Right
B．Wrong
C．Not mentioned
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更多 “ Sperm whales can produce stronger ultrasonic waves to kill their prey than dolphins.A．RightB．WrongC．Not mentioned ” 相关考题
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A life cycle project manager tends to have the following characteristics:A . balanced trainingB . stronger administrative skills than technical skillsC . stronger technical skills than administrative skillsD . stronger human resource skillsE . None of the above.
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Which of the following is NOT mentioned(提到)in this passage?A. The problems that light pollution has caused.B. The reason why humans use too much light.C. The ways that light pollution can be reduced.D. The reason why fewer stars can be seen than before.
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13 A life cycle project manager tends to have the following characteristics:A. balanced trainingB. stronger administrative skills than technical skillsC. stronger technical skills than administrative skillsD. stronger human resource skillsE. None of the above
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Irish Dolphins May Have a Unique DialectIrish scientists monitoring dolphins living in a river estuary in the southwest of the country believe they may have developed a unique dialect to communicate with each other.The Channel Dolphin and Wildlife Foundation (SDWF) has been studying a group of up to 120 bottle-nose dolphins in the River Shannon using vocalisations collected on a computer in a cow shed near the River Shannon.As part of a research project, student Ronan Hickey digitised and analysed a total of 1,882 whistles from the Irish dolphins and those from the Welsh dolphins on a computer and separated them into six fundamental whistle types and 32 different categories. Of the categories, he found most were used by both sets of dolphins—but eight were only heard from the Irish dolphins."We are building up a catalogue of the different whistle types they use and trying to associate them with behaviour like foraging, resting, socialising and the communications of groups with calves," project leader Simon Berrow said. "Essentially we are building up what is like a dictionary of words they use or sounds they make. "Berrow, a marine biologist, said the dolphins' clicks are used to find their way around and locate prey. The whistles are communications. "They do a whole range of other sounds like barks, groans and a kind of gunshot. " He said. "The gunshot is an intense pulse of sound. Sperm whales use it to stun their prey. ""When I first heard it I was surprised as I thought sperm whales were the only species who used it. We can speculate the dolphins are using it for the same reason as the sperm whales. " Berrow said.References in local legend indicate there have been dolphins in the Shannon estuary for generations and they may even have been resident there as far back as the 6th century.They are regularly seen by passengers on the Shannon ferry and an estimated 25,000 tourists every year take special sightseeing tours on local boats to visit them.The difference in eating habits between the bottle-nose dolphins and the sperm whales interested the SDWF scientists.A．RightB．WrongC．Not mentioned
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Ronan Hickey analyzed almost 2000 different dialects of the bottle-nose dolphins.A．RightB．WrongC．Not mentioned
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Of the 32 categories, eight were produced only by the Irish dolphins.A．RightB．WrongC．Not mentioned
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Whistles could also be used to communicate between adult dolphins and baby dolphins.A．RightB．WrongC．Not mentioned
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The correction to be applied to a LoranC reading when matching a sky wave to a ground wave may be found______．A.on loran charts covering areas where sky waves are usedB.in the Radio Aids to Navigation PUB 117C.in the LoranC Correction TablesD.Sky waves cannot be matched to ground waves in LoranC to produce a usable reading
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New Understanding of Natural Silk's MysteriesNatural silk,as we all know,has a strength that man-made materials have long struggled to match.In a discovery that sounds more like an ancient Chinese proverb than a materials science breakthrough,MIT re- searchers have discovered that silk gets its strength from its weakness.Or,more specifically,its many weak- nesses. Silk gets its extraordinary durability and ductility（柔韧性）from an unusual arrangement of hydrogen bonds that are intrinsically very weak but that work together to create a strong,flexible structure.Most materials一especially the ones we engineer for strength一get their toughness from brittleness.As such,natural silks like those produced by spiders have long fascinated both biologists and engineers because of their light weight,ductility and high strength(pound for pound,silk is stronger than steel and far less brittle). But on its face,it doesn't seem that silks should be as strong as they are;molecularly,they are held together by hydrogen bonds , which are far weaker than the covalent（共价的）bonds found in other molecules.To get a better understanding of how silk manages to produce such strength through such weak bonds, the MIT team created a set of computer models that allowed them to observe the way silk behaves at the atomic level. They found that the arrangement of the tiny silk nanocrystals（纳米晶体）is such that the hydro- gen bonds are able to work cooperatively,reinforcing one another against external forces and failing slowlywhen they do fail,so as not to allow a sudden fracture to spread across a silk structure.The result is natural silks that can stretch and bend while retaining a high degree of strength.But while that's all well and good for spiders,bees and the like,this understanding of silk geometry could lead to new materials that are stronger and more ductile than those we can currently manufacture.Our best and strongest materials are generally expensive and difficult to produce(requiring high temperature treatments or energy-intensive processes).By looking to silk as a model,researchers could potentially devise new manufacturing methods that rely on inexpensive materials and weak bonds to create less rigid,more forgiving materials that are nonetheless stronger than anything currently on offer. And if you thought you were going to get out of this materials science story without hearing about carbon nanotubes（纳米碳管）, think again. The MIT team is already in the lab looking into ways of synthesizing silk-like structures out of materials that are stronger than natural silk-like carbon nanotubes. Super-silks are on the horizon.It is indicated that materials stronger than natural silk can be expected in the future.A:RightB:WrongC:Not mentioned
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第二篇The Magic of SoundMusic is one of the most beautiful forms of artistic expressions ever invented.In movies and plays, music has an added function:it not only moves people but also can shock people.Our eardrums can withstand sound within 20 to 80 decibels（分贝）.Once sound exceeds this limit , even beautiful music will become ear-splitting noise and harm health.A strong blast（响声）of high sound can twist and break a solid iron sheet.High sound of 150 decibels can kill a healthy rat.In movies,sometimes the hero can produce a sound that ordinary people can't hear and only those whohave the same ability can feel.In nature,there is actually sound that is beyond our hearing.In physics,the sound that exceeds 20,000Hz is called ultrasonic（超音波的）.Dolphins, whales and bats can make such high-frequency sound.It does no harm to health.Sound less than 20Hz is called infrasonic（次声）waves.When we move, the air will vibrate.The vibration of air can produce infrasonic waves.As the frequency of infrasonic waves is close to that of people's internal organs, infrasonic wave may cause resonance（共振）in human bodies.As a result,people's vision may weaken and internal organs may rupture（断裂）.However,whether an infrasonic wave can be used as a weapon depends on its intensity.If its intensity is very low,it won't damage internal organs or a person's health.If the intensity of infrasonic wave exceeds 160 decibels,it is extremely harmful.When wind blows at a force of 3 or 4 over the sea,it will produce infrasonic waves of several decibels.Only typhoons can produce infrasonic waves of over 100 decibels.At present,scientists can only produce infrasonic weapons in the lab with the help of advanced scientific tools and powerful electric power.An ultrasonic sound______.A:is very loudB:does harm to people's healthC:cannot be heard by peopleD:is produced by the hero in movies
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第二篇The Magic of SoundMusic is one of the most beautiful forms of artistic expressions ever invented.In movies and plays, music has an added function:it not only moves people but also can shock people.Our eardrums can withstand sound within 20 to 80 decibels（分贝）.Once sound exceeds this limit , even beautiful music will become ear-splitting noise and harm health.A strong blast（响声）of high sound can twist and break a solid iron sheet.High sound of 150 decibels can kill a healthy rat.In movies,sometimes the hero can produce a sound that ordinary people can't hear and only those whohave the same ability can feel.In nature,there is actually sound that is beyond our hearing.In physics,the sound that exceeds 20,000Hz is called ultrasonic（超音波的）.Dolphins, whales and bats can make such high-frequency sound.It does no harm to health.Sound less than 20Hz is called infrasonic（次声）waves.When we move, the air will vibrate.The vibration of air can produce infrasonic waves.As the frequency of infrasonic waves is close to that of people's internal organs, infrasonic wave may cause resonance（共振）in human bodies.As a result,people's vision may weaken and internal organs may rupture（断裂）.However,whether an infrasonic wave can be used as a weapon depends on its intensity.If its intensity is very low,it won't damage internal organs or a person's health.If the intensity of infrasonic wave exceeds 160 decibels,it is extremely harmful.When wind blows at a force of 3 or 4 over the sea,it will produce infrasonic waves of several decibels.Only typhoons can produce infrasonic waves of over 100 decibels.At present,scientists can only produce infrasonic weapons in the lab with the help of advanced scientific tools and powerful electric power.It is true that the sound______.A:of nature is the most beautifulB:over 80 decibels is harmful to peopleC:of high intensity benefits animalsD:in movies is pleasing to the ear
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Irish Dolphins May Have a Unique DialectIrish scientists monitoring dolphins living in a river estuary in the southwest of the country believe they may have developed a unique dialect to communicate with each other.The Shannon Dolphin and Wildlife Foundation(SDWF)has been studying a group of up to 120 bottle- nose dolphins in the River Shannon using vocalizations（发声）collected on a computer in a cow shed near the River Shannon.As part of a research project,student Ronan Hickey digitized and analyzed a total of 1,882 whistles from the Irish dolphins and those from the Welsh dolphins on a computer and separated theni into six fundamental whistle types and 32 different categories.Of the categories,he found most were used by both sets of dol-phins一but eight were only heard from the Irish dolphins."We are building up a catalogue of the different whistle types they use and trying to associate them withbehavior like foraging（觅食）,resting, socializing and the communications of grown.ups with calves (幼 仔）,"project leader Simon Berrow said.“Essentially we are building up what is like a dictionary of wordsthey use or sounds they mnake."Berrow,a marine biologist,said the dolphins'clicks are used to find their way around and locate prey.The whistles are communications."They do a whole range 0f other sounds like barks．groans and a kind of gunshot," he said. "The gunshot is an intense pulse（脉冲）of sound. Sperm whales use it to stun（击昏）their prey.”"When I first heard it I was surprised as I thought sperm whales were the onlyh species who used it. Wecan speculate the dolphins are using it for the same reason as the sperm whales,"Berrow said.References in local legend indicate there have been dolphins in the Shannon estuary for generations and they may even have been residents there as far back as the 6th century.They are regularly seen by passengers on the Shannon ferry and an estimated 25.000 tourists every year take special sightseeing tours on local boats to visit them.As early as the 6th century,Irish fishermen started raising dolphins in the Shannon estuary.A:RightB:WrongC:Not mentioned
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Irish Dolphins May Have a Unique DialectIrish scientists monitoring dolphins living in a river estuary in the southwest of the country believe they may have developed a unique dialect to communicate with each other.The Shannon Dolphin and Wildlife Foundation(SDWF)has been studying a group of up to 120 bottle- nose dolphins in the River Shannon using vocalizations（发声）collected on a computer in a cow shed near the River Shannon.As part of a research project,student Ronan Hickey digitized and analyzed a total of 1,882 whistles from the Irish dolphins and those from the Welsh dolphins on a computer and separated theni into six fundamental whistle types and 32 different categories.Of the categories,he found most were used by both sets of dol-phins一but eight were only heard from the Irish dolphins."We are building up a catalogue of the different whistle types they use and trying to associate them withbehavior like foraging（觅食）,resting, socializing and the communications of grown.ups with calves (幼 仔）,"project leader Simon Berrow said.“Essentially we are building up what is like a dictionary of wordsthey use or sounds they mnake."Berrow,a marine biologist,said the dolphins'clicks are used to find their way around and locate prey.The whistles are communications."They do a whole range 0f other sounds like barks．groans and a kind of gunshot," he said. "The gunshot is an intense pulse（脉冲）of sound. Sperm whales use it to stun（击昏）their prey.”"When I first heard it I was surprised as I thought sperm whales were the onlyh species who used it. Wecan speculate the dolphins are using it for the same reason as the sperm whales,"Berrow said.References in local legend indicate there have been dolphins in the Shannon estuary for generations and they may even have been residents there as far back as the 6th century.They are regularly seen by passengers on the Shannon ferry and an estimated 25.000 tourists every year take special sightseeing tours on local boats to visit them.Sperm whales were the only species that can use pulses of sound to stun their prey.A:RightB:WrongC:Not mentioned
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Irish Dolphins May Have a Unique DialectIrish scientists monitoring dolphins living in a river estuary in the southwest of the country believe they may have developed a unique dialect to communicate with each other.The Shannon Dolphin and Wildlife Foundation(SDWF)has been studying a group of up to 120 bottle- nose dolphins in the River Shannon using vocalizations（发声）collected on a computer in a cow shed near the River Shannon.As part of a research project,student Ronan Hickey digitized and analyzed a total of 1,882 whistles from the Irish dolphins and those from the Welsh dolphins on a computer and separated theni into six fundamental whistle types and 32 different categories.Of the categories,he found most were used by both sets of dol-phins一but eight were only heard from the Irish dolphins."We are building up a catalogue of the different whistle types they use and trying to associate them withbehavior like foraging（觅食）,resting, socializing and the communications of grown.ups with calves (幼 仔）,"project leader Simon Berrow said.“Essentially we are building up what is like a dictionary of wordsthey use or sounds they mnake."Berrow,a marine biologist,said the dolphins'clicks are used to find their way around and locate prey.The whistles are communications."They do a whole range 0f other sounds like barks．groans and a kind of gunshot," he said. "The gunshot is an intense pulse（脉冲）of sound. Sperm whales use it to stun（击昏）their prey.”"When I first heard it I was surprised as I thought sperm whales were the onlyh species who used it. Wecan speculate the dolphins are using it for the same reason as the sperm whales,"Berrow said.References in local legend indicate there have been dolphins in the Shannon estuary for generations and they may even have been residents there as far back as the 6th century.They are regularly seen by passengers on the Shannon ferry and an estimated 25.000 tourists every year take special sightseeing tours on local boats to visit them.Irish dolphins attract tourists and over 25,000 people come to see them every year.A:RightB:WrongC:Not mentioned
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第二篇The Magic of SoundMusic is one of the most beautiful forms of artistic expressions ever invented.In movies and plays, music has an added function:it not only moves people but also can shock people.Our eardrums can withstand sound within 20 to 80 decibels（分贝）.Once sound exceeds this limit , even beautiful music will become ear-splitting noise and harm health.A strong blast（响声）of high sound can twist and break a solid iron sheet.High sound of 150 decibels can kill a healthy rat.In movies,sometimes the hero can produce a sound that ordinary people can't hear and only those whohave the same ability can feel.In nature,there is actually sound that is beyond our hearing.In physics,the sound that exceeds 20,000Hz is called ultrasonic（超音波的）.Dolphins, whales and bats can make such high-frequency sound.It does no harm to health.Sound less than 20Hz is called infrasonic（次声）waves.When we move, the air will vibrate.The vibration of air can produce infrasonic waves.As the frequency of infrasonic waves is close to that of people's internal organs, infrasonic wave may cause resonance（共振）in human bodies.As a result,people's vision may weaken and internal organs may rupture（断裂）.However,whether an infrasonic wave can be used as a weapon depends on its intensity.If its intensity is very low,it won't damage internal organs or a person's health.If the intensity of infrasonic wave exceeds 160 decibels,it is extremely harmful.When wind blows at a force of 3 or 4 over the sea,it will produce infrasonic waves of several decibels.Only typhoons can produce infrasonic waves of over 100 decibels.At present,scientists can only produce infrasonic weapons in the lab with the help of advanced scientific tools and powerful electric power.What could be the best title of the passage?A:The power of music.B:The harms of noises.C:The magic of sound.D:The discovery of infrasonic waves.
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Irish Dolphins May Have a Unique DialectIrish scientists monitoring dolphins living in a river estuary in the southwest of the country believe they may have developed a unique dialect to communicate with each other.The Shannon Dolphin and Wildlife Foundation(SDWF)has been studying a group of up to 120 bottle- nose dolphins in the River Shannon using vocalizations（发声）collected on a computer in a cow shed near the River Shannon.As part of a research project,student Ronan Hickey digitized and analyzed a total of 1,882 whistles from the Irish dolphins and those from the Welsh dolphins on a computer and separated theni into six fundamental whistle types and 32 different categories.Of the categories,he found most were used by both sets of dol-phins一but eight were only heard from the Irish dolphins."We are building up a catalogue of the different whistle types they use and trying to associate them withbehavior like foraging（觅食）,resting, socializing and the communications of grown.ups with calves (幼 仔）,"project leader Simon Berrow said.“Essentially we are building up what is like a dictionary of wordsthey use or sounds they mnake."Berrow,a marine biologist,said the dolphins'clicks are used to find their way around and locate prey.The whistles are communications."They do a whole range 0f other sounds like barks．groans and a kind of gunshot," he said. "The gunshot is an intense pulse（脉冲）of sound. Sperm whales use it to stun（击昏）their prey.”"When I first heard it I was surprised as I thought sperm whales were the onlyh species who used it. Wecan speculate the dolphins are using it for the same reason as the sperm whales,"Berrow said.References in local legend indicate there have been dolphins in the Shannon estuary for generations and they may even have been residents there as far back as the 6th century.They are regularly seen by passengers on the Shannon ferry and an estimated 25.000 tourists every year take special sightseeing tours on local boats to visit them.The difference in eating habits between the bottle-nose dolphins arid the sperm wha1c, intcrcotcd the SDWFscientists.A:RightB:WrongC:Not mentioned
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第二篇The Magic of SoundMusic is one of the most beautiful forms of artistic expressions ever invented.In movies and plays, music has an added function:it not only moves people but also can shock people.Our eardrums can withstand sound within 20 to 80 decibels（分贝）.Once sound exceeds this limit , even beautiful music will become ear-splitting noise and harm health.A strong blast（响声）of high sound can twist and break a solid iron sheet.High sound of 150 decibels can kill a healthy rat.In movies,sometimes the hero can produce a sound that ordinary people can't hear and only those whohave the same ability can feel.In nature,there is actually sound that is beyond our hearing.In physics,the sound that exceeds 20,000Hz is called ultrasonic（超音波的）.Dolphins, whales and bats can make such high-frequency sound.It does no harm to health.Sound less than 20Hz is called infrasonic（次声）waves.When we move, the air will vibrate.The vibration of air can produce infrasonic waves.As the frequency of infrasonic waves is close to that of people's internal organs, infrasonic wave may cause resonance（共振）in human bodies.As a result,people's vision may weaken and internal organs may rupture（断裂）.However,whether an infrasonic wave can be used as a weapon depends on its intensity.If its intensity is very low,it won't damage internal organs or a person's health.If the intensity of infrasonic wave exceeds 160 decibels,it is extremely harmful.When wind blows at a force of 3 or 4 over the sea,it will produce infrasonic waves of several decibels.Only typhoons can produce infrasonic waves of over 100 decibels.At present,scientists can only produce infrasonic weapons in the lab with the help of advanced scientific tools and powerful electric power.What does the author say about music?A:It may be harmful to people's health.B:It always cheers people up.C:It is very often difficult to understand.D:It sounds better when it is loud enough.
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第二篇The Magic of SoundMusic is one of the most beautiful forms of artistic expressions ever invented.In movies and plays, music has an added function:it not only moves people but also can shock people.Our eardrums can withstand sound within 20 to 80 decibels（分贝）.Once sound exceeds this limit , even beautiful music will become ear-splitting noise and harm health.A strong blast（响声）of high sound can twist and break a solid iron sheet.High sound of 150 decibels can kill a healthy rat.In movies,sometimes the hero can produce a sound that ordinary people can't hear and only those whohave the same ability can feel.In nature,there is actually sound that is beyond our hearing.In physics,the sound that exceeds 20,000Hz is called ultrasonic（超音波的）.Dolphins, whales and bats can make such high-frequency sound.It does no harm to health.Sound less than 20Hz is called infrasonic（次声）waves.When we move, the air will vibrate.The vibration of air can produce infrasonic waves.As the frequency of infrasonic waves is close to that of people's internal organs, infrasonic wave may cause resonance（共振）in human bodies.As a result,people's vision may weaken and internal organs may rupture（断裂）.However,whether an infrasonic wave can be used as a weapon depends on its intensity.If its intensity is very low,it won't damage internal organs or a person's health.If the intensity of infrasonic wave exceeds 160 decibels,it is extremely harmful.When wind blows at a force of 3 or 4 over the sea,it will produce infrasonic waves of several decibels.Only typhoons can produce infrasonic waves of over 100 decibels.At present,scientists can only produce infrasonic weapons in the lab with the help of advanced scientific tools and powerful electric power.It can be found from the last paragraph that infrasonic waves______.A:are harmless to people's healthB:exist in people's internal organsC:can be used as deadly weaponsD:can improve eyesight
考题
Human‘s brains are larger in proportion to their bodies than_______．A.whales
B.a whale
C.that of whales
D.those of whales
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Why is it that Britain today imports more clothing than it exports?（）ABritish clothing is of poor quality.BBritain does not grow cotton.CMany countries with lower costs can produce clothing more cheaply than the British can.DBritain has a highly developed transportation system.
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Select three true statements regarding Coherence（）A、 Coherence provides stronger data management than an Application ServerB、 Coherence provides better scale-out performance than a Application ServerC、 Coherence provides better scale-out performance than a Database ServerD、 Coherence provides better througput than a JMS messaging server Coherence provides stronger configuration management than Grid Control
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单选题Why is it that Britain today imports more clothing than it exports?（）A
British clothing is of poor quality.B
Britain does not grow cotton.C
Many countries with lower costs can produce clothing more cheaply than the British can.D
Britain has a highly developed transportation system.
考题
单选题In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n)（）.A
transmitterB
transducerC
transceiverD
amplifier
考题
单选题Women who smoke during pregnancy produce _____.A
lighter babies than those who don'tB
heavier babies than those who don'tC
babies who can't live longD
babies who suffer from heart diseases
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单选题It is always much better to tell a story than read it out of a book, and, if a parent can produce what, in the actual _____ of the time and the individual child, is an improvement on the printed text, so much the better.A
conditionB
situationsC
circumstancesD
state of affairs
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单选题High-speed rotating in a centrifugal purifier can produce a force （） larger than the force of gravity.A
many thousand timesB
between timesC
one timeD
at times
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