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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_____
admin
2009-02-15
50
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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