英语听力：自然百科 黄石公园的夏天 Yellowstone—15

 As the thaw¹ reaches up into the mountains, a part of Yellowstone that few ever see is briefly² revealed.

 

From its first day above the snow, this pika is obsessed³ by food. It's in a frantic⁴ race to restock its winter larder⁵ before the snow closes in again. They are part of a community of small mammals which live life on the edge up here. Carefully chosen plants are harvested and dried in haystacks before being stored below ground. This larder must be over 50 times the pika's body weight to get it through winter. The summer is so short up here that few animals can permanently⁶ live any higher.

 

But higher is exactly where the bears are heading, above the tree line, towards the barren rocks of the peaks beyond. It seems an unlikely journey for an animal led by its stomach. Why they do this will only become apparent as the summer draws to its close.

 

Meanwhile, 2000 feet below them on the Yellowstone plateau, the grasslands⁷ are facing drought.

 

1 thaw   

v.（使）融化，（使）变得友善；n.融化，缓和

参考例句：

• The snow is beginning to thaw.雪已开始融化。
• The spring thaw caused heavy flooding.春天解冻引起了洪水泛滥。

2 briefly   

adv.简单地，简短地

参考例句：

• I want to touch briefly on another aspect of the problem.我想简单地谈一下这个问题的另一方面。
• He was kidnapped and briefly detained by a terrorist group.他被一个恐怖组织绑架并短暂拘禁。

3 obsessed   

adj.心神不宁的,鬼迷心窍的,沉迷的

参考例句：

• He's obsessed by computers. 他迷上了电脑。
• The fear of death obsessed him throughout his old life. 他晚年一直受着死亡恐惧的困扰。

4 frantic   

adj.狂乱的，错乱的，激昂的

参考例句：

• I've had a frantic rush to get my work done.我急急忙忙地赶完工作。
• He made frantic dash for the departing train.他发疯似地冲向正开出的火车。

5 larder   

n.食物贮藏室，食品橱

参考例句：

• Please put the food into the larder.请将您地食物放进食物柜内。
• They promised never to raid the larder again.他们答应不再随便开食橱拿东西吃了。

6 permanently   

adv.永恒地，永久地，固定不变地

参考例句：

• The accident left him permanently scarred.那次事故给他留下了永久的伤疤。
• The ship is now permanently moored on the Thames in London.该船现在永久地停泊在伦敦泰晤士河边。

7 grasslands   

n.草原，牧场( grassland的名词复数 )

参考例句：

• Songs were heard ringing loud and clear over the grasslands. 草原上扬起清亮激越的歌声。 来自《现代汉英综合大词典》
• Grasslands have been broken and planted to wheat. 草原已经开垦出来，种上了小麦。 来自《简明英汉词典》