[单项选择]

{{B}} North Pole Explorations{{/B}}
If Santa Clans really does reside at the North Pole, he must live a lonely life. The North Pole isn’t what most of us would consider a hospitable place as the average winter temperature there is 40 degrees below zero Fahrenheit (华氏温度) (-40 Celsius). And while Santa’s reindeer are considered Arctic animals, not much life actually calls the North Pole its permanent home.
For adventurers, the North Pole is comparable to outer space: an unknown frontier that’s ripe for exploration--and exploitation. The region doesn’t belong to any one country, so there are always disputes about who can lay claim to the untapped natural resources there. And although the prospect of melting ice around. the North Pole isn’t pleasant from a global warming standpoint, it could make those resources easier to reach.
{{B}}North pole location{{/B}}
There are two North Poles.
A. overlaps exactly on the geographic North Pole
B. is set according to the Earth’s magnetic field
C. moves along the Canadian Arctic
D. locates 90 degrees north latitude