声音简介
北极光（Aurora Borealis或Northern Light）,是出现于星球北极的高磁纬地区上空的一种绚丽多彩的发光现象。北极附近的美国阿拉斯加（Alaska）就是观赏北极光的最佳地点。在阿拉斯加最北的费尔班克斯市（Fairbanks），一年里有两百多天可以看到极光，被称为“北极光首都”，因此该市每年吸引着人们前往欣赏极光美景。
Foxes on Ice 冰上的狐狸
Winter in the Arctic is unlike winter in most parts of the world. It is very cold. The Arctic fox is a very hardy animal. It can survive temperatures as low as -58ºF（-50ºC）.
The Arctic fox is about the size of a large domestic cat. The Arctic fox has a brown or grey coat in the summer, and it turns into a think white one during the winter. The white fur keeps the Arctic fox warm and makes it very hard for the fox’s prey to see it in the snow. Also, its feet are covered in fur.
Staying warm means having enough food for energy. The Arctic for prefers to eat lemmings and hares, but when times are tough, it will take what it can get. It can go with less food in the winter because it eats a lot during the summer and stores fat under its skin. It uses this fat for energy.
北极的冬天与世界上大部分地区的冬天不同。那里的冬天非常寒冷。北极狐是一种非常耐寒的动物。它可以在零下58华氏度（即零下50摄氏度）的低温下存活。
北极狐体型和一只大的家猫差不多。北极狐在夏天的时候，皮毛是棕色或灰色的，在冬天的时候会变成白色且皮毛很厚。白色的皮毛起保暖作用，同样也令北极孤的猎物很难在雪地里发现它。并且，它的爪子都被皮包褱住。
为了保持体温，要吃足够的食物以提供能量。北极狐喜欢吃旅鼠和野兔，但当环境恶劣的时候，它也是逮着什么吃什么。在冬天，北极狐吃很少也可以生存，因为在夏天它可以吃很多来储存皮下脂肪。它用这些脂肪来提供能量。
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