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  3. Which of the following does the passage mainly discuss? According to tile passage, scientists used isotopes from the water of

Which of the following does the passage mainly discuss? According to tile passage, scientists used isotopes from the water of

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问题  Which of the following does the passage mainly discuss?
  According to tile passage, scientists used isotopes from the water of the ice core to determine which of following?
选项 A、The amount of air that had bubbled to the surface since the ice had formed
B、The temperature of the atmosphere when the ice was formed
C、The date at which water had become locked in the glacier
D、The rate at which water had been frozen in the glacier
答案B
解析
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