【分析】 1. 由第二段第三句The blue ones are blue-grey all year round.可知，并不是所有北极狐的颜色都随季节而变化。故本题表述正确。
2. 由第二段最后一句...their cat eyes and rabbit feet...可知，北极狐的眼睛像猫，而脚掌像兔子。故本题表述错误。
3. 由第四段第二句They don"t open their eyes until a week after their birth.可知，北极狐出生时眼睛是闭着的。故本题表述错误。
4. 由第三段第一句The Arctic foxes feed mainly on birds, birds" eggs and other small animals.可知，北极狐主要以鸟类、鸟蛋和其他小动物为食。故本题表述正确。
5. 由最后一段最后一句Today, the number of the Arctic foxes is becoming smaller and smaller...可知，现在，北极狐的数量越来越少了。故本题表述错误。
