英语听力：自然百科 环球风情：哥斯达黎加

Our next destination could easily be described as a piece of paradise-- Costa Rica. It is a favorite get-away for both eco-trekkers and the surf set. Now if you are looking to enjoy a bit of the good life, for as they say Costa Rica, la Puda Vida, th

英语听力：自然百科 环球风情：新西兰（二）

Hello, everyone. I'm Peddy Kim. Today we're heading off to New Zealand, well known as a thrill seekers' paradise. Hey this is the country that invented bungee jumping of all things. And that's the just the beginning. So get ready and pack your sense

英语听力：自然百科 已知的宇宙：外星生命 Alien_Contact-6

To make sure Kepler's truely found a planet, scientists are using one of the largest earth-based telescopes for conformation. This telescope will also determine the planet's mass and distance from its star. Scientists are most interested in the small

英语听力：自然百科 走进西藏 tibet—2

For the argali, the worlds largest sheep, it means searching for a few tufts of grass. Descending from the hilltops to lower altitudes, the argali band together for safety. Hopefully, down here theyll be able to find enough food to last them through

英语听力：自然百科 走进西藏 tibet—1

The Tibetan Plateau is a quarter of China. Much of it is extremely remote and inhospitable. Its southern border runs through the worlds highest mountain range--the formidable Himalayas. Its central part is a wind-swept and freezing wilderness, the si

英语听力：自然百科 已知的宇宙：外星生命 Alien_Contact-5

Because from trillions of miles away, these small planets get lost in the blinding glare of their stars brightness. The sad truth of the matter is that earth-like planets are near cosmic specks of dust. And therefore detecting them is really quite ha

英语听力：自然百科 走进西藏 tibet—4

Fed by the mountain glaciers, the Tibetan plateau even has its own inland sea. This is Qinghai Lake, China's largest. Millions of years of evaporation has concentrated the minerals in the lake, turning the water salty. Rich in fish, its waters attrac

英语听力：自然百科 走进西藏 tibet—3

With hundreds of peaks over 7,000 metres and 13 peaks higher than 8,000 metres, they are the highest mountains on earth. The Tibetan region contains over 35,000 glaciers that cover over 100,000 square kilometres. They comprise the largest area of ice

英语听力：自然百科 走进西藏 tibet—5

The golden dome which is mounted right at the top of the prayer pole is the most sacred object of all. Or it will be once it's retrieved. The old Shamanic beliefs of Tibet ascribed magical powers to the landscape, but theres a far more tangible sourc

英语听力：自然百科 走进西藏 tibet—6

In this rugged and unforgiving terrain littered with fractured rock and ice-cold rivers, the slightest miscalculation may have fatal consequences. The snow leopard is the worlds highest living big cat. But theres another smaller predator that ranges

英语听力：自然百科 走进西藏 tibet—7

It's about 5,000 meters above sea level, way above the point at which altitude sickness starts to affect humans. At this height, most people are gasping for breath. But lack of oxgygen hasn't cramped this creature's style. Chiru, or Tibetan antelope

英语听力：自然百科 走进西藏 tibet—8

While the males fence, the females look on. Injured and weakened by the battle, the loser will be an easy target for the predators and scavengers that patrol the wilderness. Out here, there is little room for mistakes. With a clear view of the endles

英语听力：自然百科 走进西藏 tibet—9

The yak has even led the Tibetans to buried treasure. In summer,people can be seen scouring the grassland,bent over in deep concentration.This is the world's weirdest harvest.Tibetans first investigated this strange root-like organism,known locally a

英语听力：自然百科 走进西藏 tibet—10

Yartsa gunbu sells for big money in the top department stores of Lhasa and there is a growing market outside of Tibet. Although Tibet is modernizing fast, it retains a deeply spiritual culture. Even today, Tibetan valleys resound to distinctive and e

英语听力：自然百科 走进西藏 tibet—11

The possibility of escaping the cycle of life and death and the promise of enlightenment encourages people to perform activities that benefit all beings. This belief assigns as much importance to the environment and its creatures as it does to humans

英语听力：自然百科 走进西藏 tibet—12

Even today,black-necked cranes are treated with reverence and are welcomed by farmers as they land in the fields around the villages.Here, they perform their elaborate sky pointing rituals.After the dignified business of parading,they begin to forage

英语听力：自然百科 走进西藏 tibet—13

In such a frugal environment, the Pika's farming helps to kickstart the food chain. But the Pika itself is a very tasty morsel. Its presence has enabled an uneasy relationship to develop between the two plateau most opportunistic predators, the fox a

英语听力：自然百科 鲨鱼湾的海豚—10

Traveling at speeds of up to about 20 miles,they drive the mullet onto the beach.Trapped,the fish have no way to turn.Flattening out their bodies like surf boards,they skim in just inches of water. The surf mums are the only dolphins in the world who

英语听力：自然百科 鲨鱼湾的海豚—9

many of the mothers have been bitten,bravely trying to protect their calves.i am little worried about Puck's calf,she is really having the calf at peak shark attack time.Most of the calves born by December,this way,the calf has a little bit of time t

英语听力：自然百科 鲨鱼湾的海豚—8

Oh,whistle,i thought i hear a whistle here.something extraordinary is happening.Puck uses her unique call to identify herself to other dolphins,Yet strangely there are no other dolphins around.J believes that Puck is calling her unborn calf,if she is