文章列表

• 1.英语听力：自然百科 黄石公园的夏天 Yellowstone—18
• But just as the first of Yellowstone's new generation are preparing to leave, its last visitors are arriving. Night after night, army cutworm moths ha...
• 2.英语听力：自然百科 黄石公园的夏天 Yellowstone—17
• They are vast smoke plumes. Yellowstone is burning. Throughout the summer, the dry lodgepole pines have become like a tinderbox, and lightening has st...
• 3.英语听力：自然百科 黄石公园的夏天 Yellowstone—16
• Bison calves are more independent of their mothers. The adults' focus is now set on a ruthless competition to mate. A male bids to enter a herd with f...
• 4.英语听力：自然百科 黄石公园的夏天 Yellowstone—15
• As the thaw reaches up into the mountains, a part of Yellowstone that few ever see is briefly revealed. From its first day above the snow, this pika i...
• 5.英语听力：自然百科 黄石公园的夏天 Yellowstone—14
• Bison lose the last of their winter coats. In the heat, tempers fray. To escape soaring ground temperatures, cowbirds choose a bison's back as a cool ...
• 6.英语听力：自然百科 黄石公园的夏天 Yellowstone—13
• She chews its tail first, to make sure the fish can't get away. While the pups are still demanding milk, the mother otter will often keep the whole fi...
• 7.英语听力：自然百科 黄石公园的夏天 Yellowstone—12
• This female grew up on the lake, so she knows where to take the cubs for a very special trip. Yellowstone cutthroat trout are massing in the mouth of ...
• 8.英语听力：自然百科 黄石公园的夏天 Yellowstone—11
• The living is easy. But it won't last long. At this altitude, the air is so dry that rain evaporates before it even hits the ground. The water that fl...
• 9.英语听力：自然百科 黄石公园的夏天 Yellowstone—10
• As soon as she feels it is safe, she settles to suckle and reassure them. Bison can shrug off this sudden change in the weather; they are after all bu...
• 10.英语听力：自然百科 黄石公园的夏天 Yellowstone—9
• This pack seem prepared to allow their young a brief foray to experience the world beyond their den. But his high-octane lifestyle critically depends ...