英語聽力 學(xué)英語,練聽力,上聽力課堂! 注冊 登錄
> 在線聽力 > 英語高級聽力 > 英語聽力:探索與發(fā)現(xiàn) >  第155篇

英語聽力:冰河綠洲—8

所屬教程:英語聽力:探索與發(fā)現(xiàn)

瀏覽:

2017年03月08日

手機(jī)版
掃描二維碼方便學(xué)習(xí)和分享
https://online2.tingclass.net/lesson/shi0529/0009/9895/155.mp3
https://image.tingclass.net/statics/js/2012
But how did one man and a spear produce the huge force behind this blow? The answer lies with small bits of ivory like this. They were once part of an atlatl, or spear thrower. An atlatl acts as a sort of catapult, magnifying the strength of a hunter's throw, allowing him to launch a spear up to 200 metres, with enough power to drive the point through a bison skull. It's this kind of sophisticated technology that helped these early North Americans to spread throughout the entire continent.

But what else did they find once they reached Florida? Florida's ice age wildlife was remarkably rich and diverse. There were many familiar animals, normally found further north, but also creatures unique to the tropics. The result was a mixture of species unlike anything we see today and an abundant food source for the human immigrants.

So what produced ice age Florida's wealth of wildlife? Part of the answer comes from the ice itself.

At the peak of the last ice age, massive glaciers up to 2 miles thick covered over half the North American continent. The ice destroyed the habitat over which it lay, but it also had a profound impact on regions far away. It created a domino effect that rippled down the continent.

用戶搜索

瘋狂英語 英語語法 新概念英語 走遍美國 四級聽力 英語音標(biāo) 英語入門 發(fā)音 美語 四級 新東方 七年級 賴世雄 zero是什么意思保定市省建筑設(shè)計(jì)院宿舍英語學(xué)習(xí)交流群

網(wǎng)站推薦

英語翻譯英語應(yīng)急口語8000句聽歌學(xué)英語英語學(xué)習(xí)方法

  • 頻道推薦
  • |
  • 全站推薦
  • 推薦下載
  • 網(wǎng)站推薦