英语听力：自然百科 黄石公园的夏天 Yellowstone—11

 The living is easy. But it won't last long. At this altitude, the air is so dry that rain evaporates before it even hits the ground. The water that flows off the plateau is no longer being replaced. Already there is drought in forests beyond the meadows.

 

Yellowstone has vast ancient lava¹ fields. This porous² volcanic³ rock holds on to very little water. It is dominated by lodgepole pine, a tree that can cope with the arid⁴ conditions.

 

The forest may be parched⁵, but there is still water here, in lakes formed by ancient glaciers⁶.

 

A visiting male otter⁷ woos a female on the lake's shore. But she seems a little distracted. Her two pups are nearby. They are about ten weeks old, and the time is right to lead them from the hold. Males are not above stealing food/ from cubs⁸, so she makes it very clear that he is not going to be joining them.

 

1 lava   

n.熔岩，火山岩

参考例句：

• The lava flowed down the sides of the volcano.熔岩沿火山坡面涌流而下。
• His anger spilled out like lava.他的愤怒像火山爆发似的迸发出来。

2 porous   

adj.可渗透的，多孔的

参考例句：

• He added sand to the soil to make it more porous.他往土里掺沙子以提高渗水性能。
• The shell has to be slightly porous to enable oxygen to pass in.外壳不得不有些细小的孔以便能使氧气通过。

3 volcanic   

adj.火山的；象火山的；由火山引起的

参考例句：

• There have been several volcanic eruptions this year.今年火山爆发了好几次。
• Volcanic activity has created thermal springs and boiling mud pools.火山活动产生了温泉和沸腾的泥浆池。

4 arid   

adj.干旱的；(土地)贫瘠的

参考例句：

• These trees will shield off arid winds and protect the fields.这些树能挡住旱风,保护农田。
• There are serious problems of land degradation in some arid zones.在一些干旱地带存在严重的土地退化问题。

5 parched   

adj.焦干的；极渴的；v.（使）焦干

参考例句：

• Hot winds parched the crops.热风使庄稼干透了。
• The land in this region is rather dry and parched.这片土地十分干燥。

6 glaciers   

冰河，冰川( glacier的名词复数 )

参考例句：

• Glaciers gouged out valleys from the hills. 冰川把丘陵地带冲出一条条山谷。
• It has ice and snow glaciers, rainforests and beautiful mountains. 既有冰川，又有雨林和秀丽的山峰。 来自英语晨读30分（高一）

7 otter   

n.水獭

参考例句：

• The economists say the competition otter to the brink of extinction.经济学家们说，竞争把海獭推到了灭绝的边缘。
• She collared my black wool coat with otter pelts.她把我的黑呢上衣镶上了水獭领。

8 cubs   

n.幼小的兽，不懂规矩的年轻人( cub的名词复数 )

参考例句：

• a lioness guarding her cubs 守护幼崽的母狮
• Lion cubs depend on their mother to feed them. 狮子的幼仔依靠母狮喂养。 来自《简明英汉词典》