英语听力：探索发现 2012-10-10 长毛象王国 Mammoth—14

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Every few weeks, they warm up temporarily through bouts² of shivering which probably helps to ward³ off permanent brain damage from the cold. This deep sleep tactic⁴ helps the ground squirrels to conserve⁵ energy. But it’s a high-risk strategy, and some just don’t wake up. 30,000-year-old frozen ground squirrels have been discovered, still preserved in the underground tombs. 

 

Every inhabitant of Beringia had to have its own way of dealing⁶ with the cold, and that included those first people who arrived across the Bering Land Bridge. They knew how to make weapons and cooperate to hunt for food. They made weather-proof clothing out of animal hides and had fire to keep them warm. Without these skills, they couldn’t have survived the endless winters. 

 

But spring bring broughteasier times and excellent hunting opportunities. Spring was when Beringia’s big game gave birth to their young.

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