英语听力：探索发现 2012-10-10 长毛象王国 Mammoth—14

Arctic ground squirrels hibernate like other small mammals, but with a unique twist. They can lower their body temperature right down to almost minus 3 degrees centigrade. But thanks to a biochemical super-cooling process, they dont actually freeze.

英语听力：探索发现 2012-10-07 长毛象王国 Mammoth—13

Small ears also help to minimize heat loss, the opposite effect of those huge heat-dispersing ears of their relatives, African elephants. Other Beringia animals have more than a fur coat to help them cope with cold. This skull belongs to the bizarre-

英语听力：探索发现 2012-10-03 长毛象王国 Mammoth—11

At its maximum, the ice covered nearly six million square miles. And in places, it was up to two miles thick. The ice blanket was punctuated only by occasional islands of rock, the peaks of the very highest mountains. Though Beringia itself remained

英语听力：探索发现 2012-09-30 长毛象王国 Mammoth—10

The fact that both horses and mammoths were here suggests these forests werent. It seems that, 14,000 years ago, Beringia was a huge expanse of open grassland. This unique habitat of cold, dry grasslands is known as mammoths steppe. But thats not how

英语听力：探索发现 2012-09-28 长毛象王国 Mammoth—9

This is Alaska today, a wetland of forests, boggy tundra, lakes and rivers rivers that still churn out fresh clues to the Ice Age past. This is a brick-sized tooth, and it belong to a woolly mammoth. Its narrow ridges of enamel tell us more about how

英语听力：探索发现 2012-09-26 长毛象王国 Mammoth—8

The answer lies in the effects of North Americas immense and fluctuating ice sheets. As they grew, they locked up so much water that the sea levels began to fall. The Bering Sea between Asia and North America began to drain away, leaving a bridge of

英语听力：探索发现 2012-09-23 长毛象王国 Mammoth—7

Bears have long claws, but they get worn down by the daily grind, moving around and rooting for food. They are just not sharp enough to rip into the bisons hide. To solve this puzzle, we need to look to Africa. African buffalo are similar in size to

英语听力：探索发现 2012-09-21 长毛象王国 Mammoth—6

In one remarkable discovery recreated here, the head and hide of a large carcass was exposed a unique opportunity for scientists to tap some Ice Age secrets. The remains were of an extinct steppe bison, a longer-horned relative of the North American

英语听力：探索发现 2012-09-16 长毛象王国 Mammoth—4

Of all these creatures, the woolly mammoth is the undisputed symbol of the Ice Age. But what do we really know about how this giant lived. How did it use its massive spiral tusks? Modern-day elephants, the mammoths closest living relatives, may provi

英语听力：探索发现 2012-10-19 长毛象王国 Mammoth—18

Away from the herd, the dominant male mammoth is distracted from his usual routine, today he has a more urgent priority than food, a younger challenger that wants to take his place. This ritual clash of tusks will decide the future for them both. The

英语听力：探索发现 2012-09-14 长毛象王国 Mammoth—3

The Yukon and its neighbor, modern-day Alaska, were once part of the land that was Beringia. Stunning though this region is today is just a shadow of the world that was encountered by the First Americans. Underground, the soil is frozen solid, as it

英语听力：探索发现 2012-09-12 长毛象王国 Mammoth—2

By searching for evidence that still survives today, we reconstruct the landscape and the wildlife of prehistoric North America. During the last Ice Age, massive glaciers covered half of North America. But to the far northwest, there was a land that

英语听力：探索发现 2012-09-09 长毛象王国 Mammoth—1

21st century, North America, where people have reached even the remotest corners of the continent, and pushed back the boundaries of modern technology. But it isnt so long since humans first set foot here about 14,000 years ago. And back then, North

英语听力：探索发现 2012-09-07 爱尔兰的故事 Story Of Ireland—24

On Good Friday 1014, the opposing forces faced each other at Clontarf, outside Dublin. There were two Irish armies, but both with their Viking allies. Of these Vikings it was said they carried arrows anointed and browned in the blood of dragons. The

英语听力：探索发现 2012-09-05 爱尔兰的故事 Story Of Ireland—23

Brian did not see himself as a king among equals but as high king of all Ireland, and with a mighty army he set about trying to control the island. In the only statement of his that we know about, he describes himself as Imperator Scottorum, Emperor

英语听力：探索发现 2012-09-02 爱尔兰的故事 Story Of Ireland—22

By the 11th century, the Vikings who had settled in Ireland, the Hiberno-Norse, had been here for over a century and a half. Theyd intermarried, become Christian and formed local alliances. Theyd founded thriving port cities like Waterford, Wexford,

英语听力：探索发现 2012-08-31 爱尔兰的故事 Story Of Ireland—21

For over 40 years, the Vikings raided Irelands coastal villages and monasteries, carrying off plunder and slaves in their long boats. They struck suddenly and caught the Irish unawares. So the Vikings became bolder and began to sail down the rivers o

英语听力：探索发现 2012-08-26 爱尔兰的故事 Story Of Ireland—19

In 795, monks on an island near Dublin saw a fleet of ships approaching. The long ships with a dragons head carved on the bow carried a force of warriors who would plunder the treasures accumulated by the monastery over 2 centuries. A monk wrote late

英语听力：探索发现 2012-08-24 爱尔兰的故事 Story Of Ireland—18

For the monasteries were still producing great works of art. He might have been less enamoured at the political maneuvering. The status of clergy could have much to do with their alliances and family ties with the local aristocracy. Indeed, from the

英语听力：探索发现 2012-08-22 爱尔兰的故事 Story Of Ireland—17

But Columbanus was deeply loyal to the idea of church led by the pope from Rome. He was a decentrer, not a revolutionary. He looked beyond the monastery walls, imagining a Europe united in faith and culture. Is the narration spoken in the language of