文章列表

• 1.英语听力：探索发现 2012-11-14 美洲大平原 American Serengeti—8
• The Osage orange seeds were carried far across the plains, before being deposited, pre-packed in their fertilizer growbags, ready to take root. As the...
• 2.英语听力：探索发现 2012-11-11 美洲大平原 American Serengeti—7
• The store of pollen paints a picture of the plains of 13,000 years ago, a picture that looks very different from the open prairie grassland of today. ...
• 3.英语听力：探索发现 2012-11-09 美洲大平原 American Serengeti—6
• The site was once a spring-fed pond, full of water. Mammoths were tempted in to drink. But when they tried to climb back out, the banks were steep and...
• 4.英语听力：探索发现 2012-11-07 美洲大平原 American Serengeti—5
• Mud from the ancient riverbanks is good for building nests. lt also holds more evidence that will help us to reconstruct the ice age past. Every now a...
• 5.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...
• 6.英语听力：探索发现 2012-11-02 美洲大平原 American Serengeti—3
• Even the mastodon is buried here, a long dead relative of modern elephants. This was once a bear, but not like any bear in North America today. Claw m...
• 7.英语听力：探索发现 2012-10-31 美洲大平原 American Serengeti—2
• As North America emerged from the grip of the last ice age, the door was opened to outsiders for the very first time. As these early immigrants pushed...
• 8.英语听力：探索发现 2012-10-28 美洲大平原 American Serengeti—1
• Denver International Airport is coming to life and about to receive the first arrivals today. By midnight, more than 1,500 aircrafts wouldve touched d...
• 9.英语听力：探索发现 2012-10-26 长毛象王国 Mammoth—21
• The lions will have to try elsewhere. Could a bison be a more realistic prospect? The wind whips up again offering cover, and the hunters focus on a t...
• 10.英语听力：探索发现 2012-10-24 长毛象王国 Mammoth—20
• One giant short-faced bear is more than a match for two lions. But in this bitter climate, lions cant afford to go without a meal for long. A mammoth ...