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【单选题】

The scientists are not sure______.
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
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根据网考网移动考试中心的统计,该试题:

2%的考友选择了A选项

2%的考友选择了B选项

63%的考友选择了C选项

33%的考友选择了D选项

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