2. 外语
  3. A、The cause of the ice-age cycle. B、The duration of an ice-age cycle. C、Whether the ice-age cycle is related to the changes in E

A、The cause of the ice-age cycle. B、The duration of an ice-age cycle. C、Whether the ice-age cycle is related to the changes in E

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问题
选项 A、The cause of the ice-age cycle.
B、The duration of an ice-age cycle.
C、Whether the ice-age cycle is related to the changes in Earth’s orbit.
D、How fast the seas rose when the ice-age cycle was about to start.
答案A
解析 第4段提到的“puzzle”是针对第3段讨论的话题的，第3段讨论的主题是“冰河时代周期循环的原因”，而该段最后一句提到至今为止，没有人能找到其确切的原因，所以在第4段称之为“puzzle”，由此可见，puzzle指的是“冰河时代周期循环的原因”。因此，本题应选A。
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大学英语六级

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