2. 外语
  3. At the bottom of the world lies a【B1】______continent still wrapped in the Ice Age and, until recent times,【B2】______to man. It i

At the bottom of the world lies a【B1】______continent still wrapped in the Ice Age and, until recent times,【B2】______to man. It i

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问题     At the bottom of the world lies a【B1】______continent still wrapped in the Ice Age and, until recent times,【B2】______to man. It is a great land miss with mountain ranges whose【B3】______and elevation (高度) are still uncertain. Much of the continent is a complete【B4】______on our maps. Man has explored, on foot, less than one percent of its area.
    Antarctica differs【B5】______from the Arctic regions. The Arctic is an ocean, covered with【B6】______ pack ice and bordered by the land masses of Europe, Asia, and North America. The Antarctic is a continent almost as large as Europe and Australia 【B7】______, centred roughly on the South Pole and【B8】______by the most unobstructed (无障碍的) water areas of the world-the  Atlantic, Pacific, and Indian Oceans.
    The continental ice sheet is more than two miles high in its centre; thus, the air over the Antarctic is far more refrigerated than it is over the Arctic regions.【B9】______.And it renders unlivable those regions  whose counterparts at the opposite end of the globe are inhabited.【B10】______. This area includes most of Alaska, Siberia, and Scandinavia-a region rich in forest and mining industries【B11】______.
【B4】
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