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题目材料:

The passage suggests that which of the following is most likely to have been true of the oxygen-16 and oxygen-18 isotopes found in the lower sections of the GRIP core?
  • AThere was significantly more isotope oxygen-18 than isotope oxygen-16 in the ice layers.
  • BThere was significantly more isotope oxygen-16 than isotope oxygen-18 in the ice layers.
  • C Ratios of isotopes oxygen-18 and oxygen-16 varied in the ice layers.
  • DLayers containing isotope oxygen-18 placed stress on the layers containing isotope oxygen-16, possibly distorting them.
  • EIsotope oxygen-16, being lighter, was located mainly in the upper layers, whereas oxygen-18 had settled into the lower layers.

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