英语听力：自然百科 北极熊 冰上间谍 Spy_Bear—9

 It’s seaweed. Kelp is not wildly exciting, but it does contain carbohydrates¹ and some protein too. The cub² must find acrobatics³ rather strange. Hungry bears eat virtually anything. It’s a question of making the most of what’s around, and it’s never too soon to start hunting. Polar bears investigate almost every unfamiliar⁴ sight and smell. They are the most curious subjects ever filmed by spycams. This fascination⁵ suggests a surprising intelligence, one that evolved for the extraordinary challenges of hunting on ice. Ice floes present real difficulties for a predator⁶, continually changing their shape and form. Seals are also tricky⁷ prey⁸. In open water, they’re just too agile⁹ to catch. It becomes a little easier when they haul out on ice, but they hug the water’s edge for a quick escape. The bear immediately has a problem. There is no cover between him and his prey. He wrong-foots the seal by seemingly walking away

1 carbohydrates   

n.碳水化合物，糖类( carbohydrate的名词复数 )；淀粉质或糖类食物

参考例句：

• The plant uses the carbohydrates to make cellulose. 植物用碳水化合物制造纤维素。 来自《简明英汉词典》
• All carbohydrates originate from plants. 所有的碳水化合物均来自植物。 来自辞典例句

2 cub   

n.幼兽，年轻无经验的人

参考例句：

• The lion cub's mother was hunting for what she needs. 这只幼师的母亲正在捕猎。
• The cub licked the milk from its mother's breast. 这头幼兽吸吮着它妈妈的奶水。

3 acrobatics   

n.杂技

参考例句：

• Acrobatics is hard to learn but beautiful to watch.杂技不好学，但很好看。
• We watched a performance which included a puppet show and acrobatics.我们观看了一场演出，内容有木偶和杂技。

4 unfamiliar   

adj.陌生的，不熟悉的

参考例句：

• I am unfamiliar with the place and the people here.我在这儿人地生疏。
• The man seemed unfamiliar to me.这人很面生。

5 fascination   

n.令人着迷的事物，魅力，迷恋

参考例句：

• He had a deep fascination with all forms of transport.他对所有的运输工具都很着迷。
• His letters have been a source of fascination to a wide audience.广大观众一直迷恋于他的来信。

6 predator   

n.捕食其它动物的动物；捕食者

参考例句：

• The final part of this chapter was devoted to a brief summary of predator species.本章最后部分简要总结了食肉动物。
• Komodo dragon is the largest living lizard and a fearsome predator.科摩多龙是目前存在的最大蜥蜴，它是一种令人恐惧的捕食性动物。

7 tricky   

adj.狡猾的，奸诈的；(工作等)棘手的，微妙的

参考例句：

• I'm in a rather tricky position.Can you help me out?我的处境很棘手，你能帮我吗？
• He avoided this tricky question and talked in generalities.他回避了这个非常微妙的问题，只做了个笼统的表述。

8 prey   

n.被掠食者，牺牲者，掠食；v.捕食，掠夺，折磨

参考例句：

• Stronger animals prey on weaker ones.弱肉强食。
• The lion was hunting for its prey.狮子在寻找猎物。

9 agile   

adj.敏捷的，灵活的

参考例句：

• She is such an agile dancer!她跳起舞来是那么灵巧！
• An acrobat has to be agile.杂技演员必须身手敏捷。