北极平均温度

南极不会发生地震.
地震主要发生在各版块的交接处即地震带上,如环太平洋地震带,喜马拉雅地震带,等,赤道,北极等地方都有板块交界,因此地震活动活跃,只有南极大陆相对来说不会发生地震.

圆形,无窗,只留有一门以供进出.
圆形设计可以最大范围内取暖,只点一盏油灯就可保持屋内温度温暖；还可以减少风力
在北极圈内,有取之不尽的冰,又有用之不竭的水.每当冬天到来之前,爱斯基摩人都要建造冰屋.他们就地取材,先把冰加工成一块快规则的长方体,这就是“砖”；用水作为“泥”.材料准备好以后,他们在选择好的地方,泼上一些水,垒上一些冰快,再泼一些水,再垒一些冰快；前边不断地垒着,后边不断地冻结着,垒完的房屋就成为一个冻结成整体的冰屋,这种房屋很结实.

狐狸也是母性当家,雄性狐狸在外面到处游荡.早春季节,雄狐不断地到雌狐家里去造访,四五月份,幼狐就开始出世了.食物丰富的年景,一窝甚至能生下十几个幼仔.而当旅鼠很少的时候,它们往往会连续一年或者几年不生育.根据以...

On Jan.9,the Fish and Wildlife Service (FWS),the Interior Department agency that evaluates endangered species,was due that day to deliver its ruling on the polar bear.Though FWS had already taken over a year to investigate the polar bear's plight — green groups sued the federal government two years ago to declare the animal as threatened under the Endangered Species Act — the day before the deadline,the agency announced that it would need another month to decide,due to the complexity of the bear's situation.
That situation is as follows:As temperatures warm,the Arctic sea ice that supports the polar bear shrinks,leaving the animals to drown as they are forced to swim long distances between the ice,or simply starve to death.
鲸鱼、北极熊和海豹
Whale ,polar bear and sea dog
成千上万的北美驯鹿、麝牛、北极兔,峰年时每公顷多达1500只的旅鼠.北半球全部鸟类的1／6在北极繁育后代,而且至少有12种鸟类在北极越冬.灰熊、北极狐、北极狼在苔原草甸上巡游,茴鱼、北方狗鱼、灰鳟鱼、鲱鱼、胡瓜鱼、长身鳕鱼、白鱼及北极鲑鱼在河湖中嬉戏.在北冰洋广阔的水域中还有各种海豹、海象、角鲸、白鲸和北极熊.North America reindeer ,musk-ox ,polar hare by the thousands and tens of thousands,annual peak time the mouse of brigade as many as 1500 per hectare.The Northern Hemisphere all birds 1/6 is in North Pole breeding descendant ,have 12 kinds birds to live through the winter in North Pole and at least.Silvertip ,Arctic Fox ,North Pole wolf cruise in the tundra meadow ,the grayling ,north pike ,disheartened trout ,herring ,cucumber fish ,long body cod ,whitefish and North Pole trout have fun in river lake.Still have the various sea dog ,morse ,piece of whale ,belouga and polar bear in vast water area of the Arctic Ocean.

seasons 季节
than超出
see 看
even甚至
sun太阳
night晚上
themselves他们自己
animals 动物们
grow生长
hard 困难

1.B
2.B
3.A