文章列表

• 1.英语听力：探索发现 2013-02-13 猛玛象进城记 Mammoths to Manhattan—7
• ...and may trace their ancestry all the way back to the first dogs to enter North America. The Carolina dogs are pack animals with a strick hierarchy ...
• 2.英语听力：探索发现 2013-02-10 猛玛象进城记 Mammoths to Manhattan—6
• Saber-tooth died out, but another big cat survived. The puma may have been more able to adapt because its diet is more varied and includes small prey....
• 3.英语听力：探索发现 2013-02-08 猛玛象进城记 Mammoths to Manhattan—5
• But there is a problem with the idea that hunting caused the mass extinction. Mammoths were not the only animals to disappear. Camels survived for mil...
• 4.英语听力：探索发现 2013-02-06 猛玛象进城记 Mammoths to Manhattan—4
• The same signs appear in young male mammoth tusks, but those living in North America at the end of Ice Age laid down their stress rings three years ea...
• 5.英语听力：探索发现 2013-02-03 猛玛象进城记 Mammoths to Manhattan—3
• But even on its own, a mammoth was still highly dangerous and an attack required stealth and teamwork. One of the hunters may have acted as a decoy, d...
• 6.英语听力：探索发现 2013-02-01 猛玛象进城记 Mammoths to Manhattan—2
• To find the answers, we need to rewind history around 14,000 years to a time when the first people set foot in North America. The continent was about ...
• 7.英语听力：探索发现 2013-01-30 猛玛象进城记 Mammoths to Manhattan—1
• Downtown L.A., the ultimate modern American city, but Los Angeles skyscrapers are built over the graves of thousands of extinct Ice Age beasts. Today ...
• 8.英语听力：探索发现 2013-01-27 冰河新新州 Ice Age Oasis—20
• Though very powerful, shes not a sprinter and she needs to get close to her prey before she strikes. This time shes run too soon and its a fruitless c...
• 9.英语听力：探索发现 2013-01-25 冰河新新州 Ice Age Oasis—19
• In the heat of the day, hunters can afford to slow down and rest in the shade. Its one of the advantages of a high-protein diet. Llamas originated her...
• 10.英语听力：探索发现 2013-01-23 冰河新新州 Ice Age Oasis—18
• Meanwhile, the ground sloth, like the mastodons, must eat most of the day to fuel its huge bulk. This may be the ice age, but by midday, temperatures ...