标签：Wolves 相关文章
Even though the deer have a poor sense of smell, the musk manages to attract mates. Unfortunately, the human trade in musk glands has reduced the deer's numbers dramatically. And because only two thirds of the females have fawns each year, the popula
自然百科2011年
Further south still, unstooped, shrouded figures end the flat monotony of the Tundra. This is the tree line, the first place on our journey with sufficient warmth and liquid water to enable a tree to grow。 Surviving here is so crushingly difficult
自然百科2012年
Wolves have been cast as villains in stories -- almost since there have been stories. Jesus warned against them in the Bible; Little Red Riding Hood was tormented by one. They've been favorite symbols of evil from Aesop to Prokofieff. A new document
2005年NPR美国国家公共电台
By Paul Sisco Washington, DC 08 February 2007 watch Update Wolves report Gray wolf The gray wolf once roamed from coast to coast and from Alaska to Mexico in North America. It is believed they are second only to humans in adapting to climate extremes
2007年VOA标准英语（二月）
Environmental Prize Winner Looks to Wolves to Understand Humans 环境奖获得者通过狼来理解人性 LOS ANGELES Economists are learning about the workings of the financial world by studying packs of wolves and schools of fish. That's according
VOA标准英语2014年(五月)
We are here in Yellowstone National Park to follow some grey wolves and observe the deadly brilliance of the pack. Theyve learned to cooperate, hunting their prey with many acting as one pack. This mother grizzly knows how to protect its cub and itse
自然百科2008年
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
探索与发现2012年
Here! Boy 乖乖，看这！ Point at a ball and a dog will look at the ball, whereas a cat will probably look at your hand. Dogs seem to have a ready understanding of how human beings direct attention by pointing, and can follow our gestures almost
英语听力文摘 English Digest
Why Dogs Bark ? 犬吠为何？ Have you ever wondered why do dogs bark ? In terms of evolution , there has to be a reason for bark ing , or it probably wouldnt be there. Is it to warn of predator s ? But dogs bark when there are no predator s around
英语听力文摘 English Digest