英语听力：探索发现 2012-12-12 美洲大平原 American Serengeti—20

This trail leads to the cave and the freshly dead bison, just out of reach. Hunger makes the bear risk everything. He falls and joins the bison in its tomb. Now he can eat his fill. but after that there's no way out. ln time he'll be just one more ic

英语听力：探索发现 2012-11-30 美洲大平原 American Serengeti—15

Larger than any lion alive today, this would have been an awesome predator. These caves were probably its winter den. With such abundant game down on the plains, this hunter's life must have been pretty good. Sheer size and power and the benefit of l

英语听力：探索发现 2012-12-02 美洲大平原 American Serengeti—16

So let's go back in time, back 13,000 years to relive one day in the life of North America's great ice age plains. It's early morning at the end of a long, hot summer. Even major rivers are beginning to run low. Colombian mammoth herd follows the riv

英语听力：探索发现 2012-12-05 美洲大平原 American Serengeti—17

And all this meat in one small area attract the scavenger, the short-faced bear. Led by his super sensitive nose, his long limbs carry him many miles a day in search of carrion. He's picked up a scent, but where's the carcass? Sometimes the smaller,

英语听力：探索发现 2012-12-07 美洲大平原 American Serengeti—18

The scene is set for a daily ice age drama. Only the very largest are safe now. Patience is the key, the lionesses close in, waiting for their opportunity. The first charge causes chaos, but this is just what the lions want. ln the melee, they've alr

英语听力：探索发现 2012-12-09 美洲大平原 American Serengeti—19

But their success hasn't gone unnoticed. From many miles away, the short-faced bear can smell blood on the breeze. He sniffs his way towards the source. Meanwhile, satisfied and sleepy, the pride settles down for a snooze. More than twice the weight

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[00:03.00]American [00:03.61]American n.美国人, 美洲人 adj.美国的, 美洲的 [00:09.10]and [00:09.70]and [连接并列的名词、代词或数词]同, 和, 与 [00:14.20]angry [00:14.80]angry adj.生气的, 愤怒的, 狂暴的(风雨等) [00:19.46]animal [00:20.06]animal n.动物 [

英语1000高频词汇(超级):第01课

[00:03.00]able [00:03.41]able adj.能...的, 有才能的, 能干的, 能够的 [00:06.24]about [00:06.64]about adv.附近, 大约, 转向, 左右, 周围 prep.在附近, 关于, 在...周围, 忙于 [00:09.18]above [00:09.59]above adj.上面的, 上述的, 上文的 adv.在上面 prep.在...上

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英语听力：探索发现 2012-11-21 美洲大平原 American Serengeti—11

In a Colorado gully, hunters carried out a mammoth massacre, leaving behind the remains of at least 16 animals. The site recreated here contains a treasure trove of evidence relating to the mammoth's daily life. Again by comparing mammoth bones to el

英语听力：探索发现 2012-11-04 美洲大平原 American Serengeti—4

The death throes of the last great ice age left a signature that we can read today. These giant potholes were left behind by blocks of buried ice that melted, leaving hollows that later filled with water. For thousands of years since then, they've be

英语听力：探索发现 2012-11-16 美洲大平原 American Serengeti—9

Bison calves are born in summer and can run within a few hours of their birth. They have no choice. The herd won't wait in its eternal quest to find new grazing. Smaller grazers are still found here, too. But they stay put instead of wandering the pl

英语听力：探索发现 2012-11-18 美洲大平原 American Serengeti—10

Colombian mammoths had to feed almost round the clock to fuel their bulky bodies. But as the ice age ended, food was not the mammoths' biggest problem. A new and deadly predator began to infiltrate the plains, a match for any prey, even the mighty ma

英语听力：探索发现 2012-11-23 美洲大平原 American Serengeti—12

Because these two bull mammoths both had broken tusks, they could have fought at closer quarters than they would do normally. Twisting and turning, they became locked in a deadly embrace. Even more bizarre, this twist of fate then caused a third fata

英语听力：探索发现 2012-11-25 美洲大平原 American Serengeti—13

A lone wolf weighs as much as four coyotes, but one on one it's still no match for a bison. Wolves, though, live and hunt in packs of up to 15 and when they launch a cooperative attack, they're devastating. First they get the bison on the run, then f

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