Each sentence has a mistake. Findit by chosing A B C or D

Present discoveries and inventions will surely be the found for many other discoveries and inventions in the future

Mark the letter A, B, C, or D on your answer sheet to indicate the undelined part that needs correction in each of the following questions:
These days, most people in Britain and the US do not wear very formal clothes. But sometimes it is important to wear the right thing.
Many British people don't think about clothes very much. They just like to be comfortable. When they go out to enjoy themselves, they can wear almost anything. At theatres, cinemas and concerts you can put on what you like from elegant suits and dresses to jeans and sweaters. Anything goes, as long as you look clean and tidy.

But in Britain, as well as in the US, men in offices usually wear suits and ties, and women wear dresses or skirts (not trousers). Doctors, lawyers and business people wear quite formal clothes. And in some hotels and restaurants men have to wear ties and women wear smart dresses.
In many years, Americans are more relaxed than British people, but they are more careful with their clothes. At home, or on holiday, most Americans wear informal or sporty clothes. But when they go out in the evening, they like to look elegant. In good hotels and restaurants, men have to wear jackets and ties, and women wear pretty clothes and smart hairstyles.
It is difficult to say exactly what people wear informal or formal in Britain and the US, because everyone is different. If you are not sure what to wear, watch what other people do and then do the same. You'll feel more relaxed if you don't look too different from everyone else.

The word “they” in paragraph 4 refers to     .

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I have been very ____ up to this point, but I am going to lose my temper if you don't find my baggage immediately.

A pilot cannot fly by sight alone. In many conditions, such as flying at night and landing in dense fog, a pilot must use radar, an alternative way of navigating. Since human eyes are not very good at determining speeds of approaching objects, radar can show a pilot how fast nearby planes are moving. The basic principle of radar is exemplified by what happens when one shouts in a cave. The echo of the sounds against the walls helps a person determine the size of the cave. With radar, however, the waves are radio waves instead of sound waves. Radio waves travel at the speed of light, about 300,000 kilometres in one second. A radar set sends out a short burst of radio waves. Then it receives the echoes produced when the waves bounce off objects. By determining the tune it takes for the echoes to return to the radar set, a trained technician can determine the distance between the radar set and other objects. The word "radar" in fact gets its name from the term "radio detection and ranging". "Ranging" is the term for detection of the distance between an object and the radar set. Besides being of critical importance to pilots radar is essential for air traffic control tracking ships at sea, and for tracking weather Systems and storms

The word "tracking" in the passage most closely means...............................

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Next time your boss asks you to work late and miss your band rehearsal or board game night, point them to a new study in the Journal of Vocational Behavior. Researchers have found that spending more time on a hobby can boost people’s confidence in their ability to perform their job well. Ciara Kelly at Sheffield University and colleagues recruited 129 hobbyists — from amateur climbers to improv comedians — to look at how the time spent on their hobbies shaped their work life. To begin with, the team measured the seriousness of each participant’s hobby, asking them to rate their agreement with statements like “I regularly train for this activity”, and also assessed how similar the demands of their job and hobby were. Then, each month for seven months, participants recorded how many hours they had dedicated to their activity, and completed a scale measuring their belief in their ability to effectively do their job, or their “self-efficacy”, in which they rated themselves on statements like “At work I am able to successfully overcome many challenges”.  The researchers found that when participants spent longer than normal doing their leisure activity, their belief in their ability to perform their job increased. But this was only the case when they had a serious hobby that was dissimilar to their job, or when their hobby was similar to their work but they only did it casually. When their hobby was both serious and similar to their job, then spending more time on it actually had a detrimental effect, decreasing their self-efficacy. Why might that be? To maintain a serious hobby, people need to invest significant psychological resources, so if the activity has the same kinds of demands as their work, they may be left drained and unable to perform as well at their job. But if their hobby is quite different from their career, it may not interfere in the same way but instead help them develop other knowledge and skills that can boost their confidence at work. Of course, the data don’t provide conclusive evidence about the direction of the effect. Still, the results suggest that companies may want to encourage employees to pursue interests outside of work, as long as those activities differ from their day-to-day tasks. And they also may give pause to those who dream of packing it all in and turning their hobby into a career.  
8. Which of the following can be inferred from the passage?

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Most languages have several levels of vocabulary that may be used by the same speakers. In English, at least three have been identified and described. Standard usage includes those words and expressions understood, used, and accepted by a majority of the speakers of a language in any situation regardless of the level of formality. As such, these words and expressions are well defined and listed in standard dictionaries. Colloquialisms, on the other hand, are familiar words and idioms that are understood by almost all speakers of a language and used in informal speech or writing, but not considered acceptable for more formal situations. Almost all idiomatic expressions are colloquial language. Slang, refers to words and expressions understood by a large number of speakers but not accepted as appropriate formal usage by the majority. Colloquial expressions and even slang may be found in standard dictionaries but will be so identified. Both colloquial usage and slang are more common in speech than writing. Colloquial speech often passes into standard speech. Some slang also passes into standard speech, but other slang expressions enjoy momentary popularity followed by obscurity. In some cases, the majority never accepts certain slang phrases but nevertheless retains them in their collective memories. Every generation seems to require its own set of words to describe familiar objects and events. It has been pointed out by a number of linguists that three cultural conditions are necessary for the creation of a large body of slang expressions. First, the introduction and acceptance of new objects and situations in the society; second, a diverse population with a large number of subgroups; third, association among the subgroups and the majority population. Finally, it is worth noting that the terms "standard", "colloquial", and "slang" exist only as abstract labels for scholars who study language. Only a tiny number of the speakers of any language will be aware that they are using colloquial or slang expressions. Most speakers of English will, during appropriate situations, select and use three types of expressions.
9. It can be inferred from the passage that the author

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During the past half-century, our species has embarked on a remarkable social  experiment. For the first time in human history, great numbers of people – at all ages, in all places, of every political persuasion – have begun settling down as singletons. Until the second half of the last century, most of us married young and parted only at death. If death came early, we remarried quickly; if late, we moved in with family, or they with us. Now we marry later. We divorce, and stay single for years or decades.  The rise of living alone has produced significant social benefits, too. Young and middle-aged solos have helped to revitalise cities, because they are more likely to spend money, socialise and participate in public life. Contemporary solo dwellers in the US are primarily women: about 18 million, compared with 14 million men. The majority, more than 16 million, are middle-aged adults between the ages of 35 and 64. The elderly account for about 11 million of the total. Young adults between 18 and 34 number increased more than 5 million, compared with 500,000 in 1950, making them the fastest-growing segment of the solo-dwelling population.  Despite fears that living alone may be environmentally unsustainable, solos tend to live in apartments rather than in big houses, and in relatively green cities rather than in cardependent suburbs. There’s good reason to believe that people who live alone in cities consume less energy than if they coupled up and decamped to pursue a single-family home.
5.  The word “decamped” in paragraph 3 means _______________

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When I tell people about the idea of moving out, many people’s reaction is like, “what do your parents say?” because they assume the parents would not like their children to leave them. Well I don’t know if my parents like it but I can tell you my parents support and respect my decision. They think it is good for me to try and live on my own and then I would know it is the best to stay with my family. The most important reason for independent living is to save the travelling time to work. It used to take me one hour fifteen minutes to travel to work from my previous living place. From my new apartment, it just takes me thirty minutes so I saved forty-five minutes’ traveling time. I don’t have to get up so early and I save two-third of my traveling cost. It does not only save my time to travel for work but also from most of the places in Hong Kong. In addition, I gain my personal space and freedom by independent living. I make my own decision all the time, I do not have to say whether I would go home for dinner, I can invite my friends to come up and stay late. Of course, there are some trade-offs in living on your own. If you want to rent an apartment, there are lots of preparatory work to do. You have to keep visiting the apartments to search for your ideal one. You have to negotiate with the landlord about the price, furniture inclusion, who is responsible for the maintenance of the furniture and equipment. My experience was that after we moved into the apartment, it was not until the kitchen cupboard was soaked with water that we found out there was water leakage in the kitchen sink. Money is the main issue in living on your own. You have to be responsible for all the expenses, for example, the rent, electricity, gas, water, telephone, internet bills, etc.  Therefore, you’ve got to be well prepared and save up for your bills. Although I find my transportation time much shorter, the saved time is spent on other things, such as cooking and some other household chores. I think preparing and cooking the food do occupy a significant portion of my time, therefore I always try to make simple meals. On the other hand, I have to regularly tidy up my apartment and wash my clothes, so it doesn’t really save much of my time after all. Now everything is settled down, I’m getting used to my new life and I am enjoying it. I feel that moving out makes it easier for me to strike a balance between my work, my social life, my study and my family. It may be troublesome but it may worth  
7. The word "it" in the passage refers to ____

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Insects’ lives are very short and they have many enemies but they must survive long enough to breed and perpetuate their kind. The less insect-like they look, the better their chance of survival. To look “inedible” by imitating plants is a way frequently used by insects to survive. Mammals rarely imitate plants, but many fish and invertebrates do. The stick caterpillar is well named. It is hardly distinguishable from a brown or green twig. This caterpillar is quite common and can be found almost anywhere in North America. It is also called “measuring worm” or “inchworm”. It walks by arching its body, then stretching out and grasping the branch with its front feet then looping its body again to bring the hind fed forward. When danger threatens, the stick caterpillar stretches its body away from the branch at an angle and remains rigid and still, like a twig, until the danger has passed. Walking sticks, or stick insects, do not have to assume a rigid, twig-like pose to find protection: they look like inedible twigs in any position. There are many kinds of walking sticks, ranging in size from the few inches of the North American variety to some tropical species that may be over a foot long. When at rest their front legs are stretched out, heightening their camouflage. Some of the tropical species are adorned with spines or ridges, imitating the thorny bushes or trees in which they live. Leaves also seem to be a favorite object for insects to imitate. Many butterflies can suddenly disappear from view by folding their wings and sitting quietly among the plants that they resemble 
5. Which of the following are NOT mentioned in the passage as objects that are imitated as a means of protection?

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Social networking sites such as Facebook and MySpace do not help you make more  genuine close friends, according to a survey by researchers who studied how the websites are changing the nature of friendship networks. Although social networking on the internet helps people to collect hundreds or even thousands of acquaintances, the researchers believe that face to face contact is nearly always necessary to form truly close friendships.  “Although the numbers of friends people have on these sites can be massive, the actual number of close friends is approximately the same in the face to face real world,” said psychologist Will Reader, from Sheffield Hallam University. Social networking websites such as Facebook, Bebo and MySpace have taken off rapidly in recent years. Facebook was launched initially in 2004 for Harvard University members but has since expanded to more than 34 million users worldwide. MySpace, which was set up in 2003, has more than 200 million users and was bought by Rupert Murdoch’s News Corporation in 2005 for $580m (£285m). Previous research has suggested that a person’s conventional friendship group consists of around 150 people, with five very close friends but larger numbers of people whom we keep in touch with less regularly. This figure is so consistent that scientists have suggested it is determined by the cognitive constraints of keeping up with large numbers of people. But Dr. Reader and his team have found that social networking sites do allow people to stretch this figure. The team asked more than 200 people to fill in questionnaires about their online networking, asking for example how many online friends they had, how many of these were close friends and how many they had met face to face. The team found that although the sites allowed contact with hundreds of acquaintances, as with conventional friendship networks, people tend to have around five close friends. Ninety per cent of contacts whom the subjects regarded as close friends were people they had met face to face. “People see face to face contact as being absolutely imperative in forming close friendships,” added Dr. Reader. He told the British Association Festival of Science in York that social networking sites allow people to broaden their list of nodding acquaintances because staying in touch online is easy. “What social network sites can do is decrease the cost of maintaining and forming these social networks because we can post information to multiple people,” he said.  But to develop a real friendship we need to see that the other person is trustworthy, said Dr. Reader. "What we need is to be absolutely sure that a person is really going to invest in us, is really going to be there for us when we need them … It’s very easy to be deceptive on the internet."
7. What does the author imply in the last paragraph?

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Elephants need a large amount of habitat because they eat so much. Humans have become their direct competitors for living space. Human populations in Africa and Asia have quadrupled since the turn of the century, the fastest growth rate on the planet. Forest and savanna habitat has been converted to cropland, pastureland for livestock, and timber for housing and fuel. Humans do not regard elephants as good neighbors. When humans and elephants live close together, elephants raid crops, and rogue elephants rampage through villages. Local people shoot elephants because they fear them and regard them as pests. Some countries have established culling programs: park officials or hunters kill a predetermined number of elephants to keep herds manageable and minimize human-elephant conflicts. Hunting has been a major cause of the decline in elephant populations. Elephants became prized trophies for big-game hunters after Europeans arrived in Africa. More recently, and more devastatingly, hunters have slaughtered elephants for their ivory tusks. The ivory trade became a serious threat to elephants in the 1970s. A sudden oil shortage caused the world economy to collapse, and ivory became more valuable than gold. In fact, ivory has been called “white gold” because it is beautiful, easily carved, durable, and pleasing to the touch. Most of the world’s ivory is carved in Japan, Hong Kong, and other Asian countries, where skilled carvers depend on a supply of ivory for their livelihoods  Hunting elephants is no longer legal in many African countries, but poaching was widespread until very recently. For many the high price of ivory, about $100 a pound in the 1980s, was too tempting to resist. Local people often had few other ways to make a living, and subsistence farmers or herders could make more by selling the tusks of one elephant than they could make in a dozen years of farming or herding. As the price of ivory soared, poachers became more organized, using automatic weapons, motorized vehicles, and airplanes to chase and kill thousands of elephants. To governments and revolutionaries mired in civil wars and strapped for cash, poaching ivory became a way to pay for more firearms and supplies. Poaching has caused the collapse of elephants’ social structure as well as decimating their numbers. Poachers target the biggest elephants because their tusks are larger. They often kill all the adults in the group, leaving young elephants without any adults to teach them migration routes, dry-season water sources, and other learned behavior. Many of Africa’s remaining elephant groups are leaderless subadults and juveniles.
3. According to the second paragraph, culling programs have been established as a method to ______.

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The word noise is derived from the Latin word nausea, meaning “seasickness”. Noise is among the most pervasive pollutants today. Noise pollution can broadly be defined as unwanted or offensive sounds that unreasonably intrude into our daily activities. Noises from traffic, jet engines, barking dogs, garbage trucks, construction equipment, factories, lawn mowers, leaf blowers, televisions, boom boxes and car radios, to name a few, are among the audible litter that is routinely broadcast into the air. One measure of pollution is the danger it poses to health. Noise negatively affects human health and well-being. Problems related to noise include hearing loss, stress, high blood pressure, sleeplessness, fright, distraction, and lost productivity. Noise pollution also contributes to a general reduction in the quality of life and eliminates opportunities for tranquility. We experience noise in a number of ways. On some occasions, we can be both the cause and the victim of noise, such as when we are operating noisy appliances or equipment. There are also instances when we experience noise generated by others, just as people experience secondhand smoke. In both instances, noise is equally damaging physically. Secondhand noise is generally more troubling, however, because it is put into the environment by others, without our consent. The air into which secondhand noise is emitted and on which it travels is “a commons”. It belongs not to an individual person or a group, but to everyone. Please, businesses and organizations, therefore, do not have unlimited rights to broadcast noise the as they please, as if the effects of noise were limited only to their private property. Those that disregard the obligation to not interfere with other’ use and enjoyment of the commons by producing noise pollution are, in many ways, acting like a bully in a schoolyard. Although they may do so unknowingly, they disregard the rights of others and claim for themselves rights that are not theirs. The actual loudness of a sound is only one component of the negative effect noise pollution has on human beings. Other factors that have to be considered are the time and place, the duration, the source of the sound, and even the mood of the affected person. Most people would not be bothered by the sound of a 21-gun salute on a special occasion. On the other hand, the thump-thump of music coming from the apartment downstairs at 2a.m, even if barely audible, might be a major source of stress. The sound of neighbor’s lawn mower may be unobjectionable on a summer afternoon, but if someone is hoping to sleep late on a Saturday morning, the sound of a lawn mower starting up just after sunrise is an irritant  
4. The word “which” in paragraph 4 refers to _____

Rewrite the sentence:
“I will come back home soon,” he said.

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……… a large number of the country's craft villages are suffering from a shortage of human resources and difficulties in building brand recognition, many international organizations have had projects to help them.

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Everybody loves the circus. For almost 300 years, across Europe, Russia and America, “children of all ages” have been (1) ____ by the animals and acrobats of the circus. The first circus was founded in England in 1769 by Philip Astley, who performed horseriding stunts for a small audience. He then travelled throughout Europe and established circuses in many other countries. The circuses usually took place in outdoor areas in a circle or a ring surrounded by (2) ____. The performers thrilled their audiences with exciting acrobatic acts and horse-riding performances. Circuses as we know them today are (3) ____ displays - sometimes with several tents with shows taking place at the same time, the performers both amusing and (4) ____ their audiences. Some of the most famous circuses in history which continue to be extremely popular today include the American Barnum & Bailey Ringling Brothers Circuses, which (5)____ itself “The Greatest Show on Earth”, the Canadian Cirque du Soleil, the Moscow Circus and Billy Smart’s Circus of London. Millions of people attend them around the world each year

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The temperature of the earth is rising at nearly twice the rate it was 50 years ago. This rapid rate and pattern of warming, scientists have concluded, cannot be explained by natural cycles alone. The only way to explain the pattern is to include the effect of greenhouse gases (GHGs) emitted by humans. To come to a conclusion on climate change, the United Nations formed a group of scientists called the Intergovernmental Panel on Climate Change, or IPCC. The IPCC meets every few years to review the latest scientific findings and write a report summarizing all that is known about global warming. Each report represents a consensus, or agreement, among hundreds of leading scientists. One of the first things the IPCC learned is that there are several greenhouse gases responsible for warming, and humans emit them in a variety of ways. Most come from the combustion of fossil fuels in cars, factories and electricity production. The gas responsible for the most warming is carbon dioxide, also called CO2. Other contributors include methane released from landfills and agriculture, especially from the digestive systems of grazing animals, nitrous oxide from fertilizers, gases used for refrigeration and industrial processes, and the loss of forests that would otherwise store CO2. Different greenhouse gases have very different heat-trapping abilities. Some of them can even trap more heat than CO2. A molecule of methane produces more than 20 times the warming of a molecule of CO2. Nitrous oxide is 300 times more powerful than CO2. Other gases, such as chlorofluorocarbons, or CFCs, which have been banned in much of the world because they also degrade the ozone layer, have heat-trapping potential thousands of times greater than CO2. But because their concentrations are much lower than CO2, none of these gases adds as much warmth to the atmosphere as CO2 does. In order to understand the effects of all the gases together, scientists tend to talk about all greenhouse gases in terms of the equivalent amount of CO2. Since 1990, yearly emissions have gone up by about 6 billion metric tons of “carbon dioxide equivalent” worldwide, more than a 20 percent increase.  
5. Which of the following is NOT mentioned in paragraph 3 as a reason for warming?

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Three women, none of whom we _______ before, _______ out of the hall.

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A group of Tri-City residents and volunteers from BC Housing gathered at a  neglected therapeutic garden on the old Riverview Hospital grounds last weekend to breathe life into a green space. First planted by psychiatric nurse Art Finnie in the 1950s after he was injured on the job, Finnie’s Garden grew into one of the first experiments in horticultural  therapy. As Lauren English, director of land development for Riverview, put it, gardening as therapy was a revolutionary practice. “He understood the value of nature and how therapeutic it was before it became the rage — to find peace and to find solace and to find comfort,” added MLA Selina Robinson, who attended last Saturday’s event.  At that time, Riverview Hospital was the largest psychiatric hospital in British Columbia, with more than 5,000 patients on site. And Finnie’s was more than a garden. Beyond the rows of corn, flowers and a fish pond, residents could lounge in a picnic area or curve bowls across their own bowling green. But while the idea of Finnie’s Garden was to have a place of gathering that residents created themselves, they weren’t the first ones to make themselves at home.  Archeologists, including one on site last weekend, have found evidence Indigenous people occupied the area for thousands of years. Today, the Kwikwetlem First Nation maintains a land claim over the Riverview lands, and in its language, the area is known as Smu’q wa ala," or “Place of the Great Blue Heron”. "They found fire-altered rocks, they found boiling rocks, they found arrowheads, they found tools," said English, under the watchful eye of the group’s archeologist. “It’s not just colonial history, it’s the precontact history that goes back thousands of years.” Today, while many of the former hospital’s buildings lay in disrepair, 184 people still call the hilltop facility home, and one day in the near future, perhaps, they’ll get to use it again on their road to recovery. The event comes in a year when Treefest was cancelled because of a lack of organizers, and while the renewed work at Finnie’s Garden isn’t meant to replace Treefest, it does offer a outlet for green-thumbs without a patch of dirt.  A final community gardening event at Finnie’s Garden will likely take place in October. By removing weeds, invasive plants and adding mulch, the group plans to have the area ready to plant next spring. 
5. According to paragraph 2 and 3, who is the people implied in the line “…they weren’t the first ones to make themselves at home.”?

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200 years ago there were less than one billion humans living on earth. Today, according to UN calculations there are over 7 billion of us. Recent estimates suggest that today’s population size is roughly equivalent to 6.9% of the total number of people ever born. This is the most conspicuous fact about world population growth: for thousands of years, the population grew only slowly but in recent centuries, it has jumped dramatically. Between 1900 and 2000, the increase in world population was three times greater than during the entire previous history of humanity—an increase from 1.5 to 6.1 billion in just 100 years. How the world population is changing is of great importance for humanity’s impact on the Earth’s natural environment, but it also gives reasons to hope for a good future. This is because we have a bigger team of better educated people who can contribute to the solutions that improve global well-being. A picture of the world population in the very long-run shows extremely rapid growth. Indeed, for a long time the world population grew at an increasing rate. However, if we focus on the last couple of decades, we see that this pattern no longer holds, as the annual rate of population growth has been recently going down. 1962 saw the growth rate peak at 2.1%, and it has since fallen to almost half. A long historical period of accelerated growth has thus come to an end. Based on these observations, world history can be divided into three periods marked by distinct trends in population growth. The first period, pre-modernity, was a very long age of very slow population growth. The second period, beginning with the onset of modernity— which was characterized by rising standards of living and improving health—had an increasing growth rate that continued to rise through 1962. Today, the second period is over, and the third period is unfolding; the population growth rate is falling and will likely continue to fall, leading to an end of population growth towards the end of this century.  
5. What does the word “it” in paragraph 3 refer to?

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What results in good health and longevity? It’s good genes, good lifestyle and good luck. But since we can’t choose our parents, or know what fate holds in store for us, we must treat lifestyle with tender, loving care. Now, a report “Circulation” proves that a sound lifestyle adds 12 to 14 more years to life. For instance, a woman, aged 50, who follows these lifestyle rules can expect to live to 93 years. This compares to a woman who indulges in an unhealthy lifestyle and dies at 79. In men, the increase in longevity from a healthy lifestyle is from 76 to 88 years. In the general population, the U.S. spends more money on health care than any other country. So why are so many people in North America suffering from ill health? It is quite apparent that the epidemic of obesity, type 2 diabetes and heart attack will continue to be the big killers. At the moment there is little evidence this battle is being won. But a study that followed both staff and students at the University of Liverpool shows it’s not an impossible dream. In its first experiment, female diners were randomly divided to receive either a small or large quiche for lunch. The next day, the same group were all allowed to serve themselves any portion they desired. Researchers discovered the ones who had been served the smaller portion, tended to choose the smaller portion. A second experiment tested male diners and it produced the same result. In the third experiment both sexes were included, but it was done one week later. This time diners were asked to look at various photos of portion size and asked which looked normal. Those who were previously given the smaller portions considered the smaller ones normal.  These studies showed that it is possible to shift people from what they think is a normal portion to what is actually the proper amount to eat. And that the perception of what is normal lasts at least to one week later. Remember, a voyage of a thousand miles begins with the first step. The same philosophy applies to longevity. So, gradually incorporate one thing at a time into your lifestyle. Don’t forget the importance of smaller portions, add more fruits and vegetables, buy a pedometer to check the number of steps taken each day, and to measure your progress, step on the scale every day  
3. According to paragraph 2, what is the current situation for North America’s general health?

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Some of the senses that we and other terrestrial mammals take for granted are either reduced or absent in cetaceans or fail to function well in water. For example, it appears from their brain structure that toothed species are unable to smell. Baleen species, on the other hand, appear to have some related brain structures but it is not known whether these are functional. It has been speculated that, as the blowholes evolved and migrated to the top of the head, the neural pathways serving sense of smell may have been nearly all sacrificed. Similarly, although at least some cetaceans have taste buds, the nerves serving these have degenerated or are rudimentary. The sense of touch has sometimes been described as weak too, but this view is probably mistaken. Trainers of captive dolphins and small whales often remark on their animals’ responsiveness to being touched or rubbed, and both captive and free ranging cetacean individuals of all species (particularly adults and calves, or members of the same subgroup) appear to make frequent contact. This contact may help to maintain order within a group, and stroking or touching are part of the courtship ritual in most species. The area around the blowhole is also particularly sensitive and captive animals often object strongly to being touched there  The sense of vision is developed to different degrees in different species. Baleen species studied at close quarters underwater – specifically a grey whale calf in captivity for a year, and free-ranging right whales and humpback whales studied and filmed off Argentina and Hawaii – have obviously tracked objects with vision underwater, and they can apparently see moderately well both in water and in air. However, the position of the eyes so restricts the field of vision in baleen whales that they probably do not have stereoscopic vision. On the other hand, the position of the eyes in most dolphins and porpoises suggests that they have stereoscopic vision forward and downward. Eye position in freshwater dolphins, which often swim on their side or upside down while feeding, suggests that what vision they have is stereoscopic forward and upward. By comparison, the bottlenose dolphin has an extremely keen vision in water. Judging from the way it watches and tracks airborne flying fish, it can apparently see fairly well through the air–water interface as well. And although preliminary experimental evidence suggests that their in-air vision is poor, the accuracy with which dolphins leap high to take small fish out of a trainer’s hand provides anecdotal evidence to the contrary.  
6. As mentioned in paragraph 3, grey whale calf _____________