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Animals Can Sense Natural Disasters
Among the dead in South Asia’ s tsunami(海啸)were many tourists at Sri Lanka’ s national wildlife park at Yala. But very few of the park’s animals — elephants, buffaloes, monkeys and wild cats — appear to have died. There are theories that animals can sense natural disasters and run away to safety.
First, it’s possible that the animals may have heard the quake before the tsunami hit. The underwater burst produced sound waves known as infrasound(次声). Humans can’t hear infrasound, but many animals including dogs, elephants, tigers and pigeons can.
A second early warning sign the animals might have sensed is ground vibration(震动). The great quake would have produced vibrational waves known as Rayleigh waves. These vibrations move through the ground like waves moving on the surface of the ocean but faster. They travel at ten times the speed of sound. The Rayleigh waves would have reached Sri Lanka hours before the water hit. Mammals, birds, insects and spiders can sense Rayleigh waves. So the animals at Yala might have felt the Rayleigh waves and then run to higher ground.
But what about humans? While we can’t hear infrasound, we can feel it, although we don’t necessarily know we’re feeling it. We also experience Rayleigh waves by special sensors in our joints(关节), which exist just for that purpose. Sadly, it seems we don’t pay attention to the information when we get it. Maybe we screen it out because there’s so much going on before our eyes and in our ears.
【小题1】Why did few animals at Yala die when the tsunamis that caused a huge number of human deaths hit?
A.Because human beings cannot hear the infrasonic sound. |
B.Because the animals were staying at a higher place in the park. |
C.Because the animals were able to run much faster than human beings. |
D.Because the animals might have picked up the danger signals and ran away. |
A.Rayleigh waves can be felt both by animals and human beings. |
B.Rayleigh waves, just like infrasonic sound, can only be felt by animals. |
C.Rayleigh waves are vibrational waves that usually cause quakes or tsunamis. |
D.Rayleigh waves move on the ocean surface at a speed ten times that of sound waves. |
A.We can’t feel the infrasound so we can’t be informed of the danger. |
B.We ignore the information of tsunami’s coming even though we can also get it. |
C.We were so busy on our minds that we feel neither infrasound nor Rayleigh waves. |
D.We can feel Rayleigh waves and infrasound so we can escape the danger like animals. |
单词拼写(共10小题;每小题1分,满分10分)
【小题1】Japan _______(遭受) a great loss in the terrible earthquake.
【小题2】The teacher can easily _________ (辨认出) each student’s handwriting.
【小题3】The __________ (表情) on his face suggested that he was not satisfied with the result.
【小题4】It is a little difficult to __________(使平静)someone when he or she is excited.
【小题5】He prefers to work _______ (在户外), for he can have more time to get close to nature.
【小题6】When he was abroad, his parents were _________ (担心) about his safety.
【小题7】Not knowing a single person at the party, he felt _______ (忽视)by all the people present.
【小题8】We were so_________ (感激) to him for the help he had offered to us.
【小题9】Go __________(直接地) ahead, and you can find the museum.
【小题10】You’d better find a _______ (本地人) to show you the way to the hospital.
Among the dead in South Asia’s tsunami① were many tourists at Sri Lanka’s national wildlife park at Yala. But very few of the park’s animals — elephants, buffaloes, monkeys and wild cats — appear to have died. There are theories that animals can sense natural disasters and flee to safety.
First, it’s possible that the animals may have heard the quake before the tsunami hit. The underwater rupture likely produced sound waves known as infrasound② or infrasonic sound. Humans can’t hear infrasound, but many animals including dogs, elephants, tigers and pigeons can.
A second early warning sign the animals might have sensed is ground vibration③. The massive quake would have produced vibrational waves known as Rayleigh waves. These vibrations move through the ground like waves move on the surface of the ocean but faster. They travel at ten times the speed of sound. The Rayleigh waves would have reached SriLanka hours before the water hit. Mammals, birds, insects and spiders can sense Rayleigh waves. So the animals at Yale might have felt the Rayleigh waves and then run to higher ground.
But what about humans? While we can’t hear infrasound, we can feel it, although we don’t necessarily know we’re feeling it. We also experience Rayleigh waves by special sensors in our joints, which exist just for that purpose. Sadly, it seems we don’t pay attention to the information when we get it. Maybe we screen it out because there’s so much going on before our eyes and in our ears. Humans have a lot of things on our minds and usually that works out OK.
Notes:
tsunami n. 海啸
infrasound n. 次声
vibration n. 振动,颤动
Choose the best answers according to the above:
Why did few animals at Yala die when the tsunamis that caused a huge number of human deaths hit?
A. Because the animals were staying at a higher place in the park.
B. Because the animals were able to run much faster than human beings.
C. Because human beings cannot hear the infrasonic sound.
D. Because the animals might have picked up the danger signals and ran away.
Which of the statements about “Ravleigh waves” is true?
A. Rayleigh waves are massive vibrational waves that usually cause quakes or tsunamis.
B. Rayleigh waves move on the ocean surface at a speed ten times that of sound waves.
C. Rayleigh waves can be felt both by animals and human beings.
D. Rayleigh waves, just like infrasonic sound, can only be felt by animals.
When a tsunami hits, it is possible that ____.
A. we can’t feel the infrasound so we can’t be informed of the danger
B. we can feel Rayleigh waves as well as infrasound so we are able to escape the danger like animals
C. we were so busy with things on our minds that we feel neither infrasound nor Rayleigh waves
D. we think nothing of the information of its coming even though we can also get it
What does the underlined word “that” in the last sentence refer to?
A. Screening out the information.
B. There being so much going on before our eyes and in our ears.
C. Having a lot of things on our minds.
D. Paying attention to the information.
查看习题详情和答案>>I live in the land of Disney, Hollywood and year - round sun.You may think People , such an attractive, fun - filled place are happier than others.If so you have some mistaken ideas about the nature of happiness.
Many intelligent people still think fun equals happiness.The truth is that fun and happiness have little or nothing in common.Fun is what we experience during an act.Happiness is what we experience after an act.It is a deep, long-lasting emotion.
Going to an amusement park or a ball game, watching a movie or television are fun activities that help us relax, temporally forget our problems and maybe even laugh.But they do not bring happiness, because their positive effects end when the fun ends.
I have often thought that if Hollywood stars have a role to play, it is to teach us that happiness has nothing to do with fun.They have constant access to exciting parties, fancy cars, expensive homes, everything that spells "happiness" But in memoir(回忆录) after memoir, they expose Ac unhappiness hidden beneath all their fun: depression, alcoholism, drug addiction, broken marriages and loneliness.
Ask a bachelor why he resists marriage even though he finds dating to be less and less satisfying.If he is honest, he will tell you that he is afraid of making a commitment.For commitment is in fact quite painful.The single life is filled with fun, adventure and excitement.Man-iage has such moments, but they are not its most distinguishing features.
Similarly, couples that choose not to have children are deciding in favor of painless fun over painful happiness.They can dine out whenever they want and sleep as late as they want.Couples with babies are lucky to get a whole night' s sleep.I don't know any parent who would choose the word fun to describe raising children.
Understanding and accepting that true happiness has nothing to do with fun is one of the most liberating realizations we can ever come to.It liberates time: now we can devote more hours to activities that can truly increase our happiness.It liberates money: buying that new car or those fancy clothes that will do nothing to increase our happiness now seems pointless.And it frees us from envy: we now understand that all those rich and famous people we were so sure are happy because they are always having so much fun actually may not be happy at all.
1.What is the passage mainly about?
A.Fun and happiness. |
B.Success and satisfaction. |
C.Marriage and commitment. |
D.Entertainment and responsibility. |
2.The author probably agrees that ____.
A.fun creates long - lasting satisfaction |
B.long - standing fun may lead to happiness |
C.fun is short-lived while happiness is long-lasting |
D.fun provides enjoyment while pain leads to happiness |
3.What does the author think of marriage?
A.It ends in pain. |
B.It means commitment. |
C.It affords greater fun. |
D.It leads to raising children. |
4.If one gets the real meaning of happiness, he ____.
A.will start a business B won' t place too much value on money
C.will seek for freedom D.won't devote himself to his family
查看习题详情和答案>>
When I asked my daughter which item she would keep: the phone, the car, the cooker, the computer, the TV, or her boyfriend, she said, “the phone”. Personally, I could do without the phone entirely, which makes me unusual. Because the telephone is changing our lives more than any other piece of technology.
Point 1. The telephone creates the need to communicate, in the same way more roads create more traffic. My daughter comes home from school at 4:00 pm and then spends an hour on the phone talking to the every people she has been at school with all day. If the phone did not exist, would she have anything to talk about?
Point 2. The mobile phone means that we are never alone.”The mobile saved my life,” says Crystal Johnstone. She had an accident in her Volvo on the A45 between Otley and Skipton. Trapped inside, she managed to make the call that brought the ambulance to her rescue.
Point 3. The mobile removes our secret. It allows marketing manager of Haba Deutsch, Carl Nicolaisen, to ring his sales staff all round the world at any time of day to ask where they are, where they are going, and how their last meeting went.
Point 4. The telephone separates us. Antonella Bramanate in Rome says, “We worked in separate offices but I could see him through the window. It was easy to get his number. We were so near---but we didn’t meet for the first two weeks!”
Point 5. The telephone allows us to reach out beyond our own lives. Today we can talk to several complete strangers simultaneously(同声翻译地)on chat lines (at least my daughter does. I wouldn’t know what to talk about). We can talk across the world. We can even talk to astronauts (if you know any) while they’re space-walking. And, with the phone line hooked up to the computer, we can access the Internet, the biggest library on Earth.
【小题1】Point 1 mainly tells us that __________.
A.The writer’s daughter enjoys talking on the phone |
B.More roads create more traffic |
C.phones create the need to communication |
D.it’s easy to communicate through phones |
A.helps people deal with the emergency |
B.brings convenience as well as little secret to people |
C.is so important and should be encouraged |
D.is part of people’s life |
A.the TV screen | B.a fax machine | C.the Internet | D.the phone |
A.Phone Power | B.Kinds of Phones |
C.How to Use Phone | D.Advantages of Phones |