英语听力：自然百科 罗斯福国家公园

On the northern prairie of North Dakota, the day starts with a distinctive rhythm. Bison prepare for the mating season. The bulls bellow challenges that echo across the badlands. Prairie dogs bark shrill warnings at the approach of an intruder. You w

英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—9

Its seaweed. Kelp is not wildly exciting, but it does contain carbohydrates and some protein too. The cub must find acrobatics rather strange. Hungry bears eat virtually anything. Its a question of making the most of whats around, and its never too s

英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—10

Every hunt presents a different challenge, so he plans a new strategy each time. He slinks into the water, using a channel between the ice floes to act as cover. He swims, hardly making a sound, reaching six miles per hour at times. His front legs pr

英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—11

Back on Svalbard, it's high summer. Barnacle geese that had overwintered in Scotland have started to breed. Their calls bring hope to hungry bears. The cub stays back as his mother explores the possibilities. Bears have only recently discovered this

英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—12

They continually chatter away to each other. It's all about keeping aggression under control. Their massive claws rake the skin like knives, cutting it into strips. At two years old, this bear is testing his status, standing up to other bears. Sharin

英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—13

If it hasn't already been seen, that is. The bears at the whale carcass are in food heaven, but their peace is about to be shattered. This male heavyweight prefers to eat alone. He is bigger than the other bears and likes to throw his weight around.

英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—14

This is a high-risk strategy. Like the male at the whale carcass, some bears don't do sharing. She stands up to make herself look bigger. The cub copies. Luckily, this bear has no appetite for a fight. There is a feeding etiquette around a seal carca

英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—15

Time for kick off. It's polar bear football. Their ball control needs practice. But they are experts at dribbling. The game descends into argument. The spycams return to the benches, the bears may be play-fighting, but things still get out of hand. M

英语听力：自然百科 墨西哥龙舌兰酒

Tequila may look like many other sleepy little towns as locals pass their time in this quiet central Mexican city of 35,000, but not far from the towns square is one of the most recognizable company names in business--the headquarters of Jose Cuervo

英语听力：自然百科 日本相扑运动

Six times a year, these giants battle each other for top placement in Japan's most beloved traditional sport--Sumo. Highly ritualized, the sport dates back more than a thousand years, originating as a rite of the Shinto religion. Matches are a true w

英语听力：自然百科 Timkat：埃塞俄比亚的主显节

Kibcob will soon face his first great step on the road to priesthood. He hopes to take part in the most important ceremony of the Ethiopian Orthodox ChurchTimkat, the feast of the Epiphany, celebrating the baptism of Christ. Although Epiphany is cele

英语听力：自然百科 阿根廷牛仔

In the countryside of Argentina, cowboy life has scarcely changed over the past three centuries. The gaucho is a hero here, a legendary figure larger than life. But these are the real gauchos, men who still live this life the way as the gaucho. If th

英语听力：自然百科 爱尔兰古迹群

Over centuries, the Irish built a rich heritage of castles and monuments, using an abundance of local stone. Now many of the structures are damaged. The stone is decaying. Thanks in part to Irelands notoriously damp weather, these sites are in danger

英语听力：自然百科 百慕大三角

Intensely blue, the waters around Bermuda are warmed by the Gulf Streamone of the world's largest and swiftest oceanic currents. Humpback whales pass through these waters each year, migrating from polar feeding grounds. These waters are also known to

英语听力：自然百科 德尔斐的神谕

Here, the story goes, Oedipus first learned his fate. The Oracle of Delphi, speaking for the god Apollo, told him he would kill his father and marry his mother. As many of us learned in school, despite all his efforts, Oedipus was unable to escape hi

英语听力：自然百科 赫库兰尼姆古城

Time stopped in the year 79 AD. Mt. Vesuvius erupted, sealing two Italian towns in ash, mud and lava: the better-known city of Pompeii and the seaside resort of Herculaneumit was a vacation spot of choice for wealthy Romans. In 1752, workers excavati

英语听力：自然百科 加州葡萄酒业

In the fertile（肥沃的） valleys of central California, wine-making has grown into a giant industry and many of the family vineyards that helped develop the area still operate today. But in an era when people are increasingly concerned about the

英语听力：自然百科 深海火山爆发

Researchers witnessed a spectacular fiery（炽热的） underwater volcano explosion and captured it on video. It's believed to be the deepest ocean volcano eruption ever recorded. The undersea Pacific Ocean explosions in May of this year were recor

英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—16

But it's not enough. For a hunting bear, it doesn't get much worse than this. The seal could hardly fail to notice. But this battle-hardened seal is in no rush. Finally he gains some purchase, he's back in the game. He still believes he's in with a c

英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—17

At last, there is hope. They have finally reached the pack-ice that forms the polar icecap. Its the ultimate hunting habitat for polar bears. The icecap stretches all the way to the North Pole. Seals are found wherever it meets the sea. Its been a lo