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题目材料:

The passage is primarily concerned with
  • Arefuting certain scientific theories about Earth`s climatic history
  • B outlining new findings concerning Earth`s climate during ice ages
  • Cdiscussing new research that may challenge a long-held scientific assumption about Earth`s climatic history
  • Ddescribing the climatic changes that occurred when Earth moved from an ice age into an interglacial period
  • Ereconciling conflicting evidence concerning climatic changes.

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