2. 外语
  3. The North Pole is surrounded by land, while the South Pole is surrounded by the Antarctic Ocean. So scientists thought that_____

The North Pole is surrounded by land, while the South Pole is surrounded by the Antarctic Ocean. So scientists thought that_____

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问题 The North Pole is surrounded by land, while the South Pole is surrounded by the Antarctic Ocean. So scientists thought that______.
The scientists are not sure______.
选项 A、how long the ice age lasted
B、where ice sheets (冰川) melted during the ice age
C、what caused the temperature changes
D、what the earth is made up of
答案C
解析 根据It is still a mystery(神秘的事物)as to what caused the temperature changes that caused the ice to melt可知，人们现在还没有找到引起气温变化的原因。
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