自然地理类 知识点题库

Some of the world's most significant problems never hit headlines. One example comes from agriculture. Food riots （暴动）and hunger make news. But the trend lying behind these matters is rarely talked about. This is the decrease in the growth in production of some of the world's major crops. A new study by the University of Minnesota and McGill University in Montreal looks at where, and how far, this decline is occurring.

    The authors take a vast number of data points for the four most important crops: rice, wheat, corn and soybeans. They find that on between 24% and 39% of all harvested areas, the improvement in production that took place before the 1980s slowed down in the 1990s and 2000s.

There are two worrying features of the slowdown. One is that it has been particularly sharp in the world's most populous countries, India and China. Their ability to feed themselves has been an important source of relative stability both within the countries and on world food markets. That self-sufficiency (自给自足) cannot be taken for granted if productions continue to slow down.

    Second, production growth has been lower in wheat and rice than in corn and soybeans. This is problematic because wheat and rice are more important as foods, accounting for around half of all calories consumed. Corn and soybeans are more important as feed grains. The authors note that “we have preferentially focused our crop improvement efforts on feeding animals and cars rather than on crops that feed people and are the basis of food security in much of the world.”

    The report also states the more optimistic findings of another new paper which suggests that the world will not have to dig up a lot more land for farming in order to feed 9 billion people in 2050, as the Food and Agriculture Organization has argued.

    Instead, it says, thanks to slowing population growth, land currently ploughed（犁）up for crops might be able to revert (回返) to forest or wilderness. This could happen. The trouble is that the prediction assumes continued improvements in productions, which may not actually happen.

D

    My grandson, Daniel, and I have always been very close. When Daniel's father remarried after a divorce, Daniel, who was eleven, and his little sister, Kristie, came to live with us. My husband and I were more than happy to have kids in the house again.

    Things were going along just fine until the diabetes (糖尿病) I've lived with most of my adult life started affecting my eyes, and then more seriously, my kidneys (肾). Then everything seemed to fall apart. 

Three times a week, I had to go to the hospital to be hooked up to a dialysis machine (透析机). I was living, but I couldn't really call it a life — it was an existence. I had no energy. I dragged myself through daily chores and slept as much as I could. My sense of humor seemed to disappear.

    Daniel, seventeen by then, was really affected by the change in me. He tried as hard as he could to make me laugh, to bring back the grandma who loved to clown around (开玩笑) with him. Even in my sorry state, Daniel could still bring a smile to my face.

But things were not improving. After a year on dialysis, my condition was deteriorating (恶化) and the doctors felt that if I didn't receive a kidney transplant within six months, I would surely die. No one told Daniel this, but he knew — he said all he had to do was look after me. To top it off, as my condition worsened, there was a chance that I would become too weak to have the transplant surgery at all, and then there would be nothing they could do for me. So we started the tense and desperate wait for a kidney.

    I was adamant (坚决的) that I didn't want a kidney from anyone I knew. I would wait until an appropriate kidney became available, or I would literally die waiting. But Daniel had other plans. The time that he took me to my dialysis appointments, he did a little secret research on his own. Then he announced his intention to me.

  “Grandma, I’m giving you one of my kidneys. I'm young and I'm healthy …” He paused. He could see I wasn't at all happy with his offer. He continued, almost in whisper, “And most of all, I couldn't stand it if you weren't around.” His face wore an expression of appeal mixed with determination. He can be as stubborn as a mule (驴) once he decides on something -- but I've been told many times that I can out-stubborn any mule!

    We argued. I couldn't let him do it. We both knew that if he gave up his kidney, he would also give up his life's dream; to play football. It was all he ever talked about. And he was good, too. Daniel was co-captain and star defensive tackle (防守阻截队员) of his high school team; he expected to apply for a football scholarship and was looking forward to playing college football. He just loved the sport.

  “How can I let you throw away the thing that means the most to you?” I pleaded with him.

  “Grandma,” he said softly, “compared to your life, football means nothing to me.”

    After that, I couldn't argue anymore. So we agreed to see if he was a good donor (捐赠者) match, and then we’d discuss it further. When the tests came back, they showed Daniel was a perfect match. That was it. I knew I wasn't going to win that argument, so we scheduled the transplant.

Both surgeries went smoothly. As soon as I came out of the anesthesia (麻醉) , I could tell things were different. I felt great! The nurses in the intensive care unit had to keep telling me to lie back and be quiet — I wasn't supposed to be that lively! I was afraid to go to sleep, for fear I would break the spell (魔法) and wake up the way I had been before. But the good feeling didn't go away, and I spent the evening joking and laughing with anyone who would listen. It was so wonderful to feel alive again.

    The next day they moved me out of ICU and onto the floor where Daniel was recuperating (复原) three doors away. His grandfather helped him walk down to see me as soon as I was moved into my room. When we saw each other, we did not know what to say. Holding hands, we just sat there and looked at each other for a long time, overwhelmed by the deep feeling of love that connected us.

    Finally, he spoke, “Was it worthwhile, grandma?”

    I laughed a little ruefully (懊悔). “It was for me! But was it for you?” I asked him.

    He nodded and smiled at me. “I've got my grandma back.”

    And I have my life back. It still amazes me. Every morning, when I wake up, I thank God -- and Daniel -- for this miracle. A miracle born of the purest love.

    The Leaning Tower of Pisa was straight like a pole when the construction began in 1173. It started to shift direction soon after construction because of poor foundation in addition to the loose layer of subsoil(底土). At the beginning, it leaned to the southeast before the shaky foundation started to shift leaning towards the southwest. After the period of structural strengthening at the beginning of the 21^st century, now the Leaning Tower of Pisa leans at an angle of 3.97 degrees.

    In 1178, the shift in direction was observed for the first time when the construction had progressed further to the third floor. The tower was heavy for the three-meter foundation that was built on a weak area of land.

    For compensating(补偿) the leaning position, the builders started to construct the upper floors with one side higher than the other one. This caused the tower to lean in the other direction. This unusual structure led to the tower being actually curved. In spite of these efforts, the tower kept on leaning.

    The government of Italy started to plan prevention of the complete collapse of the tower in 1964. However, a request was put forward by the authorities to keep the leaning position because of the tourism industry of the region.

    After nearly two decades of careful planning by engineers, historians and mathematicians, the stabilization efforts for the Leaning Tower of Pisa started in 1990. The tower was closed for the general public and the people living nearby moved away. For reducing the total weight of the tower, its seven bells which represented the seven musical notes were removed. The tower was reopened for the general public on December 15, 2001.

    In May 2008, after removing another 70 metric tons of earth, the engineers announced that the tower had been finally stabilized and it would remain stable for at least 200 years.

    Chiang Mai is proud of the city's 700- year history, which has rich traditional relics and unique culture. It is located 700 km north of Bangkok and is situated among the highest mountains in the country. Chiang Mai means “the new city” in Thai. King Mengrai founded the city as the capital of the Lanna Kingdom on April 12,1296. Therefore, Chiang Mai not only became the capital and cultural center of the Lanna Kingdom, but was also to be the center of Buddhism in northern Thailand. King Mengrai , a very religious leader, founded many of the city's temples (寺庙) that remain important today.

    It is one of the few places in Thailand where it is possible to experience both historical and modern Thai Culture. The city has old temples next to modern stores. It has more than three hundred temples, among which some are the most beautiful and honorable in the entire Buddhist world, giving the city an atmosphere (氛围) of calmness.

    The old city of Chiang Mai has various dialects, architecture, traditional values, festivals, handicraft and classical dances. In addition, it has hill tribes and their wealth of unique culture. Chiang Mai city features old-world beauty and charm as well as modern enjoyment and convenience. It is also filled with natural resources including mountains, waterfalls and rivers. Nowadays there are many activities and attractions both in the city and the surrounding province, including river rafting , elephant riding and golf.

    The quality of living is excellent. Accommodation and food are of the highest standard at a very low cost. Entertainment is plentiful with numerous festivals, outdoor activities and great nightlife. A number of elephant camps, numerous outdoor activities, a variety of handicraft workshops, various cultural performances, and breathtaking scenery make Chiang Mai one of Asia's most attractive tourist destinations.

    Would it surprise you to learn that, like animals, trees communicate with each other and pass on their wealth to the next generation?

    UBC Professor Simard explains how trees are much more complex than most of us ever imagined .Although Charles Darwin thought that trees are competing for survival of the fittest, Simard shows just how wrong he was. In fact, the opposite is true: trees survive through their co-operation and support, passing around necessary nutrition “depending on who needs it”.

    Nitrogen（氮） and carbon are shared through miles of underground fungi（真菌） networks, making sure that all trees in the forest ecological system give and receive just the right amount to keep them all healthy. This hidden system works in a very similar way to the networks of neurons（神经元）in our brains, and when one tree is destroyed, it affects all.

    Simard talks about “mother trees”, usually the largest and oldest plants on which all other trees depend .She explains how dying trees pass on the wealth to the next generation, transporting important minerals to young trees so they may continue to grow .When humans cut down “mother trees” with no awareness of these highly complex “tree societies” or the networks on which they feed, we are reducing the chances of survival for the entire forest.

    “We didn't take any notice of it .” Simard says sadly. “Dying trees move nutrition into the young trees before dying, but we never give them chance.” If we could put across the message to the forestry industry, we could make a huge difference towards our environmental protection efforts for the future.

    Guinness World Records has long been recording some of the most amazing and astonishing travel and tourism facts. Here we are sharing some of the most unbelievable record-breaking accounts, all fully fact-checked and Guinness-approved.

Largest Ice Structure—The Ice Hotel in Sweden

    Each year, the ice hotel in Jukkasjarvi, Sweden, is rebuilt from blocks of frozen ice from the nearby River Torne. Covering an area of 5,500 square metres, the hotel is unsurprisingly open seasonally, from December to March, when it melts away. In 2015, the hotel celebrated its 25^th anniversary, complete with an ice bar, an ice church and ice bedrooms—one even featured a London Tube carriage made entirely of ice.

Tallest Waterfall—Angel Falls, Venezuela

    The largest waterfall by vertical(垂直的) area may be Victoria Falls, which sit on the border between Zimbabwe and Zambia, but it's South America that's home to the world's tallest.

    Angel Falls, located in Bolivar, Venezuela, has an impressive, uninterrupted drop of 807 metres.

    It was actually named after the American pilot, Jimmie Angel, who first recorded it in his logbook on November 16, 1933.

Largest Area of Glowing Sea—Indian Ocean, near Somalia

    Bioluminescence(生物体发光) is the production and emission of light by a living thing and can be used to explain the surprising phenomenon(现象)of “glowing oceans.”

    It was in 1995 that scientists detected glowing sea in the Indian Ocean—just off the coast of Somalia-via satellite, The water was more than 250 kilometres long, and it was all thanks to the bacteria called phytoplankton.

Most Expensive Hotel Room—The Royal Penthouse Suite at Geneva's Hotel President Wilsom

    This particular suite is just the ticket, costing as much as US$83,000(£53,760)per night.

    But the high price will gain you access to 12 bedrooms and 12 marble bathrooms across 18,000 square feet.

    Deserts are found where there is little rainfall or where rain for a whole year falls in only a few weeks' time. Ten inches of rain may be enough for many plants to survive if the rain is spread throughout the year. If it falls within one or two months and the rest of the year is dry, those plants may die and a desert may form.

    Sand begins as tiny pieces of rock that get smaller and smaller as wind and weather wear them down. Sand dunes (沙丘) are formed as winds move the sand across the desert. Bit by bit, the dunes grow over the years, always moving with the winds and changing the shape. Most of them are only a few feet tall, but they can grow to be several hundred feet high.

There is, however, much more to a desert than sand. In the deserts of the southwestern United States, cliffs (悬崖) and deep valleys were formed from thick mud that once lay under a sea more than millions of years ago. Over the centuries, the water dried up. Wind, sand, rain, heat and cold all wore away at the remaining rocks. The faces of the desert mountains are always changing –-very, very slowly —as these forces of nature continue to work on the rock.

    Most deserts have a surprising variety of life. There are plants, animals and insects that have adapted to life in the desert. During the heat of the day a visitor may see very few signs of living things, but as the air begins to cool in the evening, the desert comes to life. As the sun begins to rise again in the sky, the desert once again becomes quiet and lonely.

    Queensland is one of the most amazing states in Australia. It has some of the most beautiful natural scenery on the planet, with the Great Barrier Reef, rainforests and impressive beaches.

The Great Barrier Reef

It is one of the world's largest natural features. It stretches more that 2,300 km along the north eastern coast of Australia from the northern tip of Queensland to just north of Bundaberg. The things that most surprise visitors to the reef are the colors.

Without doubt, the best way to see the Great Barrier Reef is by diving. If you have a little extra money and you are feeling a bit lazy, you can fly over the reef in a plane.

Fraser Island

Another area of natural beauty is Fraser Island. This is the world's largest sand island. It's best visited from Hervey Bay on the mainland, where there are a number of places offering trips around the island. To fully appreciate Fraser Island you should go for three or four days. Attractions include some beautiful fresh-water lakes, particularly Lake Wabby and Lake Mckenzie. You can walk around these on white sands untouched by human footprints. Indian Head also has some beautiful views. Braver travelers can go and watch sharks circling the water hundreds of meters below.

The Whitsunday Islands

    It would be a pity to travel around Queensland without taking a trip around the Whitsunday Islands. They were named by Captain Cook in 1770, after the day on which he arrived. Here are some of the great things you can do there.

●Cruise around them on a relaxing trip.

●Take a sailing course.

●Look at the aboriginal (土著的) paintings in caves on Hook Island.

●Have fun in the water doing lots of water sports.

    So, will you be going to Queensland?

The National Gallery

Description:

    The National Gallery is the British national art museum built on the north side of Trafalgar Square in London. It houses a different collection of more than 2,300 examples of European art ranging from 13th-century religious paintings to more modem ones by Renoir and Van Gogh. The older collections of the gallery are reached through the main entrance while the more modem works in the East Wing are most easily reached from Trafalgar Square by a ground floor entrance

    Layout:

    The modem Sainsbury Wing on the western side of the building houses 13th- to 15th-century paintings, and artists include Duccio, Uccello, Van Eyck, Lippi, Mantegna, Botticelli and Memling.

    The main West Wing houses 16th-century paintings, and artists include Leonardo da Vinci, Cranach, Michelangelo, Raphael, Bruegel, Bronzino, Titan and Veronese.

    The North Wing houses 17th-century paintings, and artists include Caravaggio, Rubens, Poussin, Van Dyck, Velazquez, Claude and Vermeer.

    The East Wing houses 18th- to early 20th-century paintings, and artists include Canaletto, Goya, Turner, Constable, Renoir and Van Gogh.

Opening Hours:

    The Gallery is open every day from 10am to 6pm (Fridays 10am to 9pm) and is free, but charges apply to some special exhibitions.

Getting There:

    Nearest underground stations: Charing Cross (2-minute walk), Leicester Square (3-minute walk), Embankment (7-minute walk), and Piccadilly Circus (8-minute walk).

阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。

    A city without cars would be very strange, right? But Venice is such a city.

    Venice is in the northeast of Italy. It wasn't built on land, like Beijing or Shanghai, but on more than 110 islands. Seawater is everywhere around the city.

    Even so, travel isn't difficult. The waterways have always been the best way to get around. There are 117 waterways and more than 400 bridges that can guide you where you want to go.  People in Venice move from place to place by boat.

    Water makes the city special, but it is also a big problem. Sometimes tourists will have such strange experiences. One moment they walk across the Rialto Bridge, and there's nothing special. But when they come back to the bridge an hour later, it's underwater and everyone is wearing rain shoes.

    Once, people used too much underground water. This made the city get lower little by little. Now the city has gone down by 23 centimeters. Another problem is the rising seawater. The temperature has risen over the years. This has made the ice of the Arctic Ocean (北冰洋) melt (融化). Every year, high waters hit the city in autumn and winter. When a lot of water comes, more than half of the city is underwater.

    Scientists are trying different ways to stop the city from getting even lower. The Italian government has asked some of Italy's biggest companies to build the MOST project, which was planned to be build under the seawater to stop the rising water. Anyway, this project is helping solve the problem.

    It's not often you get information about a destination from a heavy metal band, but in Debrecen, Hungary's second largest city, locals are used to having to make a noise to get heard.

    Just off the historic center, Roncs bar is a pub that also hosts live music.  It has the atmosphere of a student party in an old building that might soon be knocked down.

    Roncs is owned by Hungary's best-known heavy metal rock band, Tankcsapda. Sometimes referred to as the “Hungarian Metallica", the band has taken a type of music that is famous worldwide and-through lyrics, album covers, and an annual New Year's party and concert-made it all about their home city.

    It's perhaps fitting that Tankcsapda should be seen as ambassadors for Debrecen-the city sometimes needs loud heavy metal rock music to get noticed. “Foreigners think that Hungary is Budapest and there's nothing else,” is a familiar saying on Debrecen's:streets.

    Debrecen has, at times, been more important than the current seat of power, with locals claiming it takes over in times of trouble.

    That doesn't quite add up.

    Debrecen survived an attack from the Mongols in the 13th century, the Black Death, 150 years of struggle against the Ottomans and numerous conflicts, and yet it has still only briefly been the country's capital twice. This happened for the first time after a short-lived revolution in 1849, and for a second time at the end of World War II.

    Today, Debrecen may not be well known to tourists, but that only adds to the charm of this relaxed city. It's a small place; the historical center is sized for strolling (散步) and regular cafe stops. There's also a view of Debrecen's mix of architectural styles, a result of the frequent large fires that back in the 19th century led the city's students to form one of Europe's first-ever fire brigades (消防队).

    You can also see traditional weathercocks from the rooftops, featuring Islamic star and crescent moon symbols that once advertised to Ottoman invaders that the city preferred trading to fighting.

    Trade meant that Debrecen's skilled people became very successful and the city became famous for-among other things-fine foods, hats and clay pipes. In the early 19th century, 10 million clay pipes were reportedly made a year, with thousands bought for Britain's navy.

    Sometimes known as “The Big Apple” or “the City That Never Sleeps”, New York is both the most populous city in the USA and a leading center of business, commerce, finance and media. The city is often referred to as “New York City”, in order to distinguish it from the state it is in. The city is part of a large metropolitan（大都市的）area, and the combined city population exceeds 18.7 million.

    New York City is made up of five boroughs（行政区）and hence another nickname of the city is “The Five Boroughs”. The five boroughs are: The Bronx, Brooklyn, Manhattan, Queens and Staten Island.

    There are many famous buildings and sights in New York, especially in Manhattan. These include the Empire State Building, the Flatiron Building and the United Nations Building. When you visit New York, make sure you see Central Park, Times Square, Chinatown, Little Italy and of course the Statue of Liberty. Additionally, there are many wonderful museums in New York, some truly excellent shops, some of the world's best theaters in the Broadway area, and the neighborhoods of Greenwich Village and SoHo which are well-known for the artists who reside there.

    Getting around New York City is simple—the city's subway network is one of the most comprehensive in the world, connecting all parts of Manhattan in rapid time.

    However, the best way to see New York is undoubtedly on foot. Central Park is an ideal place to start a walking tour of New York City—843 acres of shining ponds and lush greenery attract locals and tourists. And apart from offering breathtaking scenery, it is a centre for recreation. Visitors can listen to music groups, watch performers, walk along the trails and even take a romantic ride in a horse carriage.

    The New Caledonia Barrier Reef (新喀里多尼亚堡礁)is located in New Caledonia in the South Pacific, and is the second-longest coral reef in the world, after Australia's Great Barrier Reef. The New Caledonia Barrier reef surrounds Grand Terre, New Caledonia's largest island, as well as the Ile des Pins and several smaller islands, reaching a length of 1, 500 km. The reef encloses(围住) in a lake of 24, 000 square kilometers, which has an average depth of 25 meters. The reefs lie up to 30 kilometers from the shore, but extend almost 200 km to the Entrecasteaux reefs in the northwest. This northwestern extension encloses the Belep Islands. Several natural passages open out to the ocean. The Boulari passage(通道), which leads to Noumea, the capital and chief port of New Caledonia, is noted for the Amedee lighthouse.

    The reef has great species diversity with a high level of endemism(动植物的特有分布), and is home to endangered dugongs, a kind of sea animal, and is an important nesting site for Green Sea Turtle.

    Most of the reefs are generally thought to be in good health. Some of the eastern reefs have been damaged by wastewater from nickel mining(镍开采)on Grand Terre. The waste from mining, agriculture, and grazing(放牧) has affected reefs near river mouths, which has been worsened by the destruction of mangrove forests, which help to keep wastes. Some reefs have been buried under several meters of wastes.

    In January 2002, the French government proposed(提议) listing New Caledonia's reefs as a UNESCO World Heritage Site. UNESCO listed New Caledonia Barrier Reef on the World Heritage List on 7 July 2008.

    Canada is a very large country. It is the second largest country in the world. By contrast it has a very small population. There are only about 29 million people there. Most Canadians are of British or French origin, and French is an official language of Canada as well as English. About 45% of the people are of British origin, that is, they or their parents or grandparents, etc., come from Britain. Nearly 30% are of French origin. Most of the French-Canadians live in the province of Quebec.

    Over the years, people have come to live in Canada from many countries in the world. They are from most European countries and also from China, besides other Asian countries.

    However, Canada was not an empty country when the Europeans began to arrive. Canadian Indians lived along the coast, by the rivers and lakes and in forests. Today there are only about 350, 000 Indians in the whole country, with their own languages. In the far north live the Inuit. There are only 27, 000 Canadian-Inuit. Their life is hard in such a difficult climate.

    The world maps will soon be altered to reflect an eighth continent! Dubbed "Zealandia" the landmass that lies east of Australia covers 4.9 million km. Over 94 percent of it is submerged (淹没的) in the southwest Pacific Ocean, with just the islands of New Zealand and New C aledonia visible above sea level.

    To be clear, the underwater land is not a recent find. Researchers have known about its existence since 1995 when Bruce Luyendyk discovered and proposed an eighth continent that he called Zealandia. At the time, the area was dismissed as a collection of islands and land fragments (碎片), or at the most, classified as a micro continent—a landmass of continental crust that is not geologically connected to the nearest continent, in this case, Australia.

    However, after observing the areas features on an underwater topography map, New Zealand geologist Nick became convinced that Zealandia is a continent. Mortimer says that while Zealandia is much smaller than our seven continents, at over half the size of Australia, it is unfair to classify it as a microcontinent. The geologist argues, “If you could pull the plug on the world's oceans, then Zealandia would probably long ago have been recognized as a continent.”

    Geologist Christopher Scotese argues that too much of the landmass is underwater, asserting it's "almost a continent the way Pluto is almost a planet." Richard Ernst, a geologist, proposes coining a new term minicontinent—for Zealandia. He thinks this is perfect given that it is too large to be called a microcontinent and too small to be classified as a full-sized continent. Given that there is no international panel to decide the fate of Zealandia, its future as a continent is uncertain. Mortimer hopes that if supporters start using the term Zealandia, it may eventually catch on. Whether that happens remains to be seen, but for now, we will have to be satisfied with just seven continents!

    What is the greatest threat to mankind? Maybe different people come up with different answers. However, there is no denying the fact that the only threat to humankind, apart from humankind itself, is, without any doubt, the nature. Natural disasters are the result of natural environmental processes that have a damaging effect on people. Natural disasters can come in many forms: such as geological events like earthquakes, tsunamis or mud-rock flows, climatic events like storms, hurricanes or tornadoes and fire events like forest fires and wildfires.

    The damage done by natural disasters is mainly as a result of our inability to predict(预测) exactly when they will happen. Although great progress has been made in designing and developing forecasting models for some natural disasters, complete certainty is still impossible. Even to be pessimistic, there is a possibility that human beings will never achieve accurate prediction of the happening of all natural disasters.

    What's more, even though we were able to predict these disasters from nature, preventing them is equally impossible. So we only have two ways to both prevent injuries or deaths and reduce economic losses to the least. These two methods are to prepare before a natural disaster comes to hit, and to manage the necessary resources and public services after a natural disaster strikes.

    These two things have always been at the leading position of the projects of both national governments and international organizations. In the United States, the Federal Emergency Management Agency is responsible for the "preparedness, response and recovery planning" of both man-made and natural disasters.

    Most natural disasters cannot be prevented, and both emergency preparation and good disaster management are the best ways to deal with them. Although natural events may appear to serve no purpose but simply to punish and destroy, natural disasters, a perfect symbol of the great power of the nature, are display of our planet's evolution and its state of change.

    Tahiti is one of the largest islands of French Polynesia. It is located in the southern Pacific Ocean. The capital of Tahiti is Papeete, which lies on the northwest coast. This island has mountains that are volcanic (火山产生的). The people of Tahiti came from Polynesia. The Spanish first discovered this island, but they didn't rule it. Tahiti is close to South America and Los Angeles is just seven and a half hours' journey away by air. The scenery is beautiful and tourists often spend their vacations there.

    The weather in Tahiti is warm and there are heavy rains in the mountainous areas. The weather doesn't change much, so it is generally sunny. The weather is important for the plants and animals on this Polynesian island. The green rain forest is home to a lot of plants and animals. Flowers are seen here and there.

    Tourism is an important industry in Tahiti. There are many archaeological (考古学的) wonders, which are worth seeing in Tahiti. There are also festivals and activities such as boat riding, shark feeding and whale watching which are interesting experiences for travelers.

    Tahiti is a dream destination for divers as the sea waters are warm all year round and are full of active sea life, Raiatea Mountain is where mummies(木乃伊) of former rulers of Tahiti are kept. The people here consider it a holy place.

    Travelers are welcomed and a travel agent can help plan a well­arranged trip to Tahiti.

People are always looking for lost cities and occasionally one is found: Borobudur in Indonesia, for example. But perhaps some of the places people look for never existed—or did they? Here are just a few famous mythical(神话里的) cities.

El Dorado

El Dorado is a story that began in 1537, when Spanish explorers found the Muisca people in the mountains of what is now Colombia. They heard the story of a man who covered himself with gold and dived into a lake. Then people began to talk of El Dorado— "the golden man". Soon people started to think of El Dorado as a place, too—a city of gold and amazing riches. Nowadays, the name "El Dorado" is still used to mean "a place where you can get rich quickly".

Atlantis

There was once an island in the middle of the Atlantic Ocean. It was the mythical island of Atlantis. The people of the island were very rich, thanks to the natural resource on the island. For hundreds of years, they lived simple lives. But slowly they began to change. They started to want power. So the gods decided to destroy Atlantis. Suddenly, the island and its people were swallowed (淹没)by the sea and were never seen again.

Shambhala

In Tibetan Buddhist traditions, Shambhala is a mystical country that is hidden somewhere behind the Himalayas. Shambhala is a word from an old language that means "a place of peace" or "a place of happiness". It is said that there is no war in Shambhala, and in the future, when the world is full of war, a huge army will come out of Shambhala, destroy the world's bad rulers, and start a new Golden Age. Some people say this will happen in 2424.

Given Australia's size and the fact that early settlements were far apart, Australian society is remarkably homogeneous (同种的). Its citizens are fundamentally prosperous and the way of life in the major cities and towns is much the same however many miles divide them. It takes a sharp ear to identify regional accents.  

However, there is some difference in lifestyle between city dwellers and the country people. Almost 90 per cent of the population lives in the fast-paced cities along the coast and has little more than a passing familiarity with the desert. The major cities preserve pockets of colonial heritage, but the overall impression is modern, with new buildings reflecting the country's youth. In contrast, the rural communities tend to be slow-moving and conservative. For many years, Australia was said to have "ridden on the sheep's back", a reference to wool being the country's main money earner. However, the wool industry is no longer dominant. Much of Australia's relatively sound economy is now achieved from natural coal and wheat, and by being the largest diamond producer in the world. Newer industries such as tourism and wine making are also increasingly important. Australians are generally friendly and relaxed, with a self-deprecating sense of humor. On the whole, Australia is a society without hierarchies (等级制度), an attitude generally held to stem from its prisoner beginnings.

Yet, contrary to widespread belief, very few Australians have true prisoner origins. Within only one generation of the arrival of the First Fleet in 1788, Australia had become a nation of immigrants. Originally coming almost entirely from the British Isles, today one in three Australians comes from elsewhere. Australia's liberal postwar immigration policies led to an influx of survivors from war-torn Europe, most notably Greeks, Italians, Poles and Germans.

The emphasis has shifted in recent years and today the majority of new immigrants are from Southeast Asia. Today Australia is a 'blend of nations' and although some racism exists, it has generally been a successful experiment and the country is justifiably proud to have one of the most harmonious multicultural communities in the world.

The Arctic, Atlantic, Indian and Pacific are the four oceans we learned about in the geography class. But now we have a new ocean.

On World Oceans Day, which falls on June 8, the US National Geographic Society announced it would recognize the Southern Ocean in Antarctica, bringing the global total to five.

Unlike the Arctic, Atlantic, Indian and Pacific Oceans—which are defined by the continents that bound them—the Southern Ocean is instead characterized by the Antarctic Circumpolar Current (ACC， 绕 南 极 洋 流 ). According to the National Geographic, the Southern Ocean includes most of the waters surrounding Antarctica out to 60 degrees south latitude (南纬).

"Rimmed (环绕边缘) by the powerful swift ACC, it is the only ocean to touch three others and to completely embrace a continent rather than being embraced by them," Sylvia Earle, US marine biologist and oceanographer, told the Daily Mail.

Those familiar with the Southern Ocean know it's unlike any other." Anyone who has been there will struggle to explain what's so attractive about it, but they'll all agree that the glaciers are bluer, the air colder, the mountains more intimidating(使人望而 生畏的) and the landscapes more captivating than anywhere else you can go," Seth Sykora-Bodie, a marine scientist at the National Oceanic and Atmospheric Administration, told National Geographic.

Due to the ecologically distinct environment of the Southern Ocean, it's home to thousands of unique species. The ocean also has wider ecological effects. For example, humpback whales are known to feed on small shrimp off Antarctica during the summer before migrating north to the warmer climates of Central and South America for the colder winter months, according to the Daily Mail.

National Geographic hopes their revised maps will bring public awareness to the region, thereby encouraging Southern Ocean conservation— but its significance is beyond that.

"We think it's really important from an educational standpoint, as well as from a map-labeling standpoint, to bring attention to the Southern Ocean as a fifth ocean," Alex Tait, National Geographic Society geographer, told The Post." So when students learn about parts of the ocean world, they learn it's an interconected ocean, and they learn there are these regions called oceans that are really important, and there's a distinct one in the icy waters around Antarctica. "