文章列表

• 1.英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—3
• She blinks in the sunlight. She spent her confinement in semi-darkness. She checks that the coast is clear and then reveals her secrets. Time for a st...
• 2.英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—2
• She pushes the camera down the slope, a tracking shot. As she films, there is no human presence of any kind. She even adjusts the camera to record her...
• 3.英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—1
• The islands of Svalbard in Arctic Norway. They might be remote, but they are under surveillance. Spy cameras are capturing the most intimate images ev...
• 4.英语听力：自然百科 大迁徙 Great Migrations—18
• But there is desperation here for the crocs well. Eat well now, and they may survive leaner times for months even a year. It's easy to forget that dea...
• 5.英语听力：自然百科 大迁徙 Great Migrations—17
• The merciless yellow crazy ants take a terrible toll. But by sheer force of numbers and the inexorable will of their genes, they prevail. That is the ...
• 6.英语听力：自然百科 大迁徙 Great Migrations—16
• Finally, they can rest. For another five months, they will cling to this winter refuge, entering a sort of waking trance of energy conservation. Until...
• 7.英语听力：自然百科 大迁徙 Great Migrations—15
• Soon there may be violence as males joust to win female affections. But for now, everyone enjoys a touching reunion. The calf, out of his depth among ...
• 8.英语听力：自然百科 大迁徙 Great Migrations—14
• Many will drown in their frenzy to launch their eggs seaward. Most years, only a handful of their offspring survive. But sometimes, if wind and sea an...
• 9.英语听力：自然百科 大迁徙 Great Migrations—13
• On Christmas Island, a different kind of home-coming preparation has begun. The males, though exhausted by their long pilgrimage, are readying snug bu...
• 10.英语听力：自然百科 大迁徙 Great Migrations—12
• It takes four days for the larva to emerge. It gorges on its own egg case, before turning to tender milkweed. It must grow fat, build up its reserves ...