THE SOUND OF DOLPHIN
A. Each and every dolphin has a different sound just like you and me, a sound that other dolphins recognize as a particular individual. Even a new baby dolphin, (calf), can detect its mother’s whistle within the pod soon after birth. Utilizing their blowholes, air sacks and valves, dolphins can emit a very wide variety of sounds. In fact, the frequency levels range 10 times beyond what humans can hear.
B. This system is called “Echolocation”, or “Sonar”, just like what a submarine uses to navigate while underwater. Yet the dolphins’ sonar is much more advanced than human technology and can pinpoint exact information about its surroundings ranging from size, distance and even the nature of the object.
C. Millions of years ago, toothed whales developed echolocation, a sensory faculty that enabled them to survive in often murky and dark aquatic environments. It is a process in which an organism probes its environment by emitting sounds and listening to echoes as the sounds bounce off objects in the environment. With sound traveling better in water than electromagnetic, thermal, chemical, or light signals, it was advantageous for dolphins to evolve echolocation, a capability in which acoustic energy is used, in a sense, to see underwater. Synonymous with the term “sonar” (sound navigation and ranging) and used interchangeably, dolphin echolocation is considered to be the most advanced sonar capability, unrivaled by any sonar system on Earth, man-made or natural.
D. Dolphins identify themselves with signature whistles. However, scientists have found no evidence of a dolphin language. For example, a mother dolphin may whistle to her calf almost continually for several days after giving birth. This acoustic imprinting helps the calf learn to identify its mother. Besides whistles, dolphins produce clicks and sounds that resemble moans, trills, grunts and squeaks. They make these sounds at any time and at considerable depths. Sounds vary in volume, wavelength, frequency and pattern. Dolphins produce sounds ranging from 0.25 to 150 kHz. The lower frequency vocalizations (0.25 to 50 kHz) are likely used in social communication. Higher frequency clicks (40 to 150 kHz) are primarily used in echolocation. Dolphins rely heavily on sound production and reception to navigate, communicate, and hunt in dark or murky waters. Under these conditions, sight is of little use. Dolphins can produce clicks and whistles at the same time.
E. As with all toothed whales, a dolphin’s larynx does not possess vocal cords, but researchers have theorized that at least some sound production originates from the larynx. Early studies suggested that “whistles” were generated in the larynx while “clicks” were produced in the nasal sac region. Technological advances in bio-acoustic research enable scientists to better explore the nasal region. Studies suggest that a tissue complex in the nasal region is most likely the site of all sound production. Movements of air in the trachea and nasal sacs probably produce sounds.
F. The process of echolocation begins when dolphins emit very short sonar pulses called clicks, which are typically less than 50-70 millionth of a second long. The clicks are emitted from the melon of the dolphin in a narrow beam. A special fat in the melon called lipid helps to focus the clicks into a beam. The echoes that are reflected off the object are then received by the lower jaws. They enter through certain parts of the lower jaw and are directed to ear bones by lipid fat channels. The characteristics of the echoes are then transmitted directly to the brain.
G. The short echolocation clicks used by dolphins can encode a considerable amount of information on an ensonified object - much more information than is possible from signals of longer duration that are emitted by manned sonar. Underwater sounds can penetrate objects, producing echoes from the portion of the object as well as from other surfaces within the object. This provides dolphins with a way to gain more information than if only a simple reflection occurred at the front of the object.
H. Dolphins are extremely mobile creatures and can therefore direct their sonar signals on an object from many different orientations, with slightly different bits of information being returned at each orientation; and since the echolocation clicks are so brief and numerous, the multiple reflections from internal surfaces return to the animal as distinct entities and are used by the dolphin to distinguish between different types of objects. Since they possess extremely good auditory-spatial memory, it seems that they are able to “remember” all the important information received from the echoes taken from different positions and orientations as they navigate and scan their environment. Dolphins’ extremely high mobility and good auditory spatial memory are capabilities that enhance their use of echolocation. With much of the dolphin’s large brain (which is slightly larger than the human brain) devoted to acoustic signal processing, we can better understand the evolutionary importance of this extraordinary sensory faculty. Yet no one feature in the process of echolocation is more important than the other. Dolphin sonar must be considered as a complete system, well adapted to the dolphin’s overall objective of finding prey, avoiding predators, and avoiding dangerous environments.
I. This ideal evolutionary adaption has contributed to the success of cetacean hunting and feeding and their survival as a species overall. As a result, dolphins are especially good at finding and identifying prey in shallow and noisy coastal waters containing rocks and other objects. By using their sonar ability, dolphins are able to detect and recognize prey that have burrowed up to 1 foot into sandy ocean or river bottoms –a talent that has stirred the imagination (and envy) of designers of manmade sonar.
J. Researchers, documenting the behavior of Atlantic dolphins foraging for buried prey along the banks of Grand Bahama Island, have found that these dolphins, while swimming close to the bottom searching for prey, typically move their heads in a scanning motion, either swinging their snout back and forth or moving their heads in a circular motion as they emit sonar sounds. They have been observed digging as deep as 18 inches into the sand to secure prey. Such a capability is unparalleled in the annals of human sonar development.
CAN SCIENTISTS TELL US: WHAT HAPPINESS IS?
A. Economists accept that if people describe themselves as happy, then they are happy. However, psychologists differentiate between levels of happiness. The most immediate type involves a feeling; pleasure or joy. But sometimes happiness is a judgment that life is satisfying, and does not imply an emotional state. Esteemed psychologist Martin Seligman has spearheaded an effort to study the science of happiness. The bad news is that we’re not wired to be happy. The good news is that we can do something about it. Since its origins in a Leipzig laboratory 130 years ago, psychology has had little to say about goodness and contentment. Most psychologists have concerned themselves with weakness and misery. There are libraries full of theories about why we get sad, worried, and angry. It hasn’t been respectable science to study what happens when lives go well. Positive experiences, such as joy, kindness, altruism and heroism, have mainly been ignored. For every 100 psychology papers dealing with anxiety or depression, only one concerns a positive trait.
B. A few pioneers in experimental psychology bucked the trend. Professor Alice Isen of Cornell University and colleagues have demonstrated how positive emotions make people think faster and more creatively. Showing how easy it is to give people an intellectual boost, Isen divided doctors making a tricky diagnosis into three groups: one received candy, one read humanistic statements about medicine, and one was a control group. The doctors who had candy displayed the most creative thinking and worked more efficiently. Inspired by Isen and others, Seligman got stuck in. He raised millions of dollars of research money and funded 50 research groups involving 150 scientists across the world. Four positive psychology centres opened, decorated in cheerful colours and furnished with sofas and baby-sitters. There were get-togethers on Mexican beaches where psychologists would snorkel and eat fajitas, then form “pods” to discuss subjects such as wonder and awe. A thousand therapists were coached in the new science.
C. But critics are demanding answers to big questions. What is the point of defining levels of haziness and classifying the virtues? Aren’t these concepts vague and impossible to pin down? Can you justify spending funds to research positive states when there are problems such as famine, flood and epidemic depression to be solved? Seligman knows his work can be belittled alongside trite notions such as “the power of positive thinking”. His plan to stop the new science floating “on the waves of self- improvement fashion” is to make sure it is anchored to positive philosophy above, and to positive biology below.
D. And this takes us back to our evolutionary past. Homo sapiens evolved during the Pleistocene era (1.8 m to 10,000 years ago), a time of hardship and turmoil. It was the Ice Age, and our ancestors endured long freezes as glaciers formed, then ferocious floods as the ice masses melted. We shared the planet with terrifying creatures such as mammoths, elephant-sized ground sloths and sabre-toothed cats. But by the end of the Pleistocene, all these animals were extinct. Humans, on the other hand, had evolved large brains and used their intelligence to make fire and sophisticated tools, to develop talk and social rituals. Survival in a time of adversity forged our brains into a persistent mould. Professor Seligman says: “Because our brain evolved during a time of ice, flood and famine, we have a catastrophic brain. The way the brain works is looking for what’s wrong. The problem is, that worked in the Pleistocene era. It favoured you, but it doesn’t work in the modern world”.
E. Although most people rate themselves as happy, there is a wealth of evidence to show that negative thinking is deeply ingrained in the human psyche. Experiments show that we remember failures more vividly than success. We dwell on what went badly, not what went well. Of the six universal emotions, four anger, fear, disgust and sadness are negative and only one, joy, is positive. (The sixth, surprise, is neutral). According to the psychologist Daniel Nettle, author of Happiness, and one of the Royal Institution lectures, the negative emotion each tells us “something bad has happened” and suggest a different course of action.
F. What is it about the structure of the brain that underlies our bias towards negative thinking? And is there a biology of joy? At Iowa University, neuroscientists studied what happens when people are shown pleasant and unpleasant pictures. When subjects see landscapes or dolphins playing, part of the frontal lobe of the brain becomes active. But when they are shown unpleasant images, a bird covered in oil, or a dead soldier with part of his face missing the response comes from more primitive parts of the brain. The ability to feel negative emotions derives from an ancient danger-recognition system formed early in the brain’s evolution. The pre-frontal cortex, which registers happiness, is the part used for higher thinking, an area that evolved later in human history.
G. Our difficulty, according to Daniel Nettle, is that the brain systems for liking and wanting are separate. Wanting involves two ancient regions the amygdala and the nucleus accumbens that communicate using the chemical dopamine to form the brain’s reward system. They are involved in anticipating the pleasure of eating and in addiction to drugs. A rat will press a bar repeatedly, ignoring sexually available partners, to receive electrical stimulation of the “wanting” parts of the brain. But having received brain stimulation, the rat eats more but shows no sign of enjoying the food it craved. In humans, a drug like nicotine produces much craving but little pleasure.
H. In essence, what the biology lesson tells us is that negative emotions are fundamental to the human condition and it’s no wonder they are difficult to eradicate. At the same time, by a trick of nature, our brains are designed to crave but never really achieve lasting happiness.
MOVIE OF METROPOLIS
…being the science-fiction film that is steadily becoming a fact
A. When German director Fritz Lang visited the United States in 1924, his first glimpse of the country was a night-time view of the New York skyline from the deck of an ocean liner. This, he later recalled, was the direct inspiration for what is still probably the most innovative and influential science-fiction film ever made – Metropolis.
B. Metropolis is a bleak vision of the early twenty-first century that is at once both chilling and exhilarating. This spectacular city of the future is a technological marvel of high-rise buildings connected by elevated railways and airships. It’s also a world of extreme inequality and social division. The workers live below ground and exist as machines working in an endless routine of mind-numbing 10-hour shifts while the city’s elite lead lives of luxury high above. Presiding over them all is the Master of Metropolis, John Fredersen, whose sole satisfaction seems to lie in the exercise of power.
C. Lang’s graphic depiction of the future is conceived in almost totally abstract terms. The function of the individual machines is never defined. Instead, this mass of dials, levers and gauges symbolically stands for all machines and all industry, with the workers as slave-live extensions of the equipment they have to operate. Lang emphasizes this idea in the famous shift-change sequence at the start of the movie when the workers walk in zombie-like geometric ranks, all dressed in the same dark overalls and all exhibiting the same bowed head and dead-eyed stare. An extraordinary fantasy sequence sees one machine transformed into a huge open-jawed statue which then literally swallows them up.
D. On one level the machines and the exploited workers simply provide the wealth and services which allow the elite to live their lives of leisure, but on a more profound level, the purpose of all this demented industry is to serve itself. Power, control and the continuance of the system from one 10-hour shift to the next is all that counts. The city consumes people and their labour and in the process becomes a perverse parody of a living being.
E. It is enlightening, I think, to relate the film to the modern global economy in which multinational corporations now routinely close their factories in one continent so that they can take advantage of cheap labour in another. Like the industry in Metropolis, these corporations’ goals of increased efficiency and profits have little to do with the welfare of the majority of their employees or that of the population at large. Instead, their aims are to sustain the momentum of their own growth and to increase the monetary rewards to a tiny elite – their executives and shareholders. Fredersen himself is the essence of the big company boss: Rupert Murdoch would probably feel perfectly at home in his huge skyscraper office with its panoramic view of the city below. And it is important that there is never any mention of government in Metropolis – the whole concept is by implication obsolete. The only people who have power are the supreme industrialist, Fredersen, and his magician/scientist cohort Rotwang.
F. So far so good: when the images are allowed to speak for themselves the film is impeccable both in its symbolism and in its cynicism. The problem with Metropolis is its sentimental story-line, which sees Freder, Fredersen’s son, instantly falling in love with the visionary Maria. Maria leads an underground pseudo-religious movement and preaches that the workers should not rebel but should await the arrival of a ‘Mediator’ between the ‘Head’ (capital) and the ‘Hands’ (labour). That mediator is the ‘Heart’ – love, as embodied, finally, by Freder’s love of Maria and his father’s love of him.
G. Lang wrote the screenplay in collaboration with his then-wife Thea von Harbou. In 1933 he fled from the Nazis (and continued a very successful career in Hollywood). She stayed in Germany and continued to make films under the Hitler regime. There is a constant tension within the film between the too-tidy platitudes of von Harbou’s script and the uncompromisingly caustic vigour of Lang’s imagery.
H. To my mind, both in Metropolis and in the real world, it’s not so much that the ‘Head’ and ‘Hands’ require a ‘Heart’ to mediate between them but that the ‘Hands’ need to develop their own ‘Head’, their own political consciousness, and act accordingly – through the ballot box, through buying power and through a sceptical resistance to the materialistic fantasies of the Fredersens.
I. All the same, Metropolis is probably more accurate now as a representation of industrial and social relations than it has been at any time since its original release. And Fredersen is certainly still the most potent movie symbol of the handful of elusive corporate figureheads who increasingly treat the world as a Metropolis-like global village.
Part 1
Questions 1-5
Do the following statements agree with the information given in the Reading Passage?
TRUE if the statement agrees with the information
FALSE if the statement contradicts the information
NOT GIVEN if there is no information on this
1. Every single dolphin is labeled by a specific sound. 1
2. The system a dolphin uses as the detector could give a whole picture of the observed objects. 2
3. Echolocation is a specific system evolving only for animals living in a dim environment. 3
4. The sounds are made only in the area related to the nose. 4
5. When producing various forms of sounds, dolphins have the asynchronism as one characteristic. 5
Questions 6-8
Choose the correct letter A, B, C or D.
Questions 9-13
Complete the sentences below. Choose NO MORE THAN THREE WORDS from the passage.
Whether 9 exists or not has not been confirmed yet. 10 is the bond between the baby dolphin and its mother. What’s more, 11 which are like different sounds made by humans are also used by dolphins. The sounds are made at a certain level of depth within a specific scope from a higher frequency aimed at communicating to a lower one to echolocate. Sounds are vital to dolphins living in deep waters while 12 is not that imperative. Similar to all toothed whales, vocal cords do not exist in 13 but it produces some sound. The tissue in the nasal area is perhaps to do with the sound production.
Part 2
Questions 14-20
Reading Passage has eight paragraphs, A–H.
Which paragraph contains the following information?
14. An experiment involving dividing several groups one of which received positive icon 14
15. Review of a poorly researched psychology area 15
16. Contrast being made about the brains’ action as response to positive or negative stimulus 16
17. The skeptical attitude toward the research seemed to be a waste of fund 17
18. a substance that produces much wanting instead of much liking 18
19. a conclusion that lasting happiness is hardly obtained because of the nature of brains 19
20. One description that listed the human emotional categories 20
Questions 21-25
Complete the sentences below. Choose NO MORE THAN FOUR WORDS from the passage.
A few pioneers in experimental psychology study what happens when lives go well. Professor Alice divided doctors, making a tricky experiment, into three groups: besides the one control group, the other two either are asked to read humanistic statements about drugs or received 21 . The latter displayed the most creative thinking and worked more efficiently. Since critics are questioning the significance of the 22 for both levels of happiness and classification for the virtues. Professor Seligman countered in an evolutional theory: survival in a time of adversity forged our brains into the way of thinking for what’s wrong because we have a 23 .
There is bountiful of evidence to show that negative thinking is deeply built in the human psyche. Later, at Iowa University, neuroscientists studied the active parts in brains to contrast when people are shown pleasant and unpleasant pictures. When positive images like 24
are shown, part of the frontal lobe of the brain becomes active. But when they are shown unpleasant image, the response comes from 25
of the brain.
Choose the correct letter A, B, C or D.
Part 3
Questions 27-30
Do the following statements agree with the information given in the Reading Passage?
YES if the statement agrees with the views of the writer
NO if the statement contradicts the views of the writer
NOT GIVEN if it is impossible to say what the writer thinks about this
27. The inspiration of the Movie-Metropolis-comes from the director’s visit in the USA in 1924. 27
28. The Master of Metropolis, John Fredersen, is portrayed from an industrialist that the director met in the US. 28
29. The start of the movie exhibits the workers working in full energy. 29
30. The director and his wife got divorced because his wife decided to stay in Germany. 30
Questions 31-36
Complete the sentences below. Choose NO MORE THAN TWO WORDS from the passage.
The director depicts a world of inequality and 31 . In the future, the mindless masses of workers living underground are treated as 32 . And the master of them is 33 , who is in charge of the whole city. The writer claims that the director, Fritz Lang, presents the movie in an 34 term, where the 35 of the individual machines is not defined. Besides the writer compares the film to the modern global economy in which multinational corporations concern more about the growing 36 and money.
Questions 37-40
Choose the correct letter A, B, C or D.