Which of the following does the passage mainly discuss? According to the passage, Grenoble, France, is the place where

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问题  Which of the following does the passage mainly discuss?
  According to the passage, Grenoble, France, is the place where

选项 A、instruments were developed for measuring certain chemical elements
B、scientists first recorded atmospheric levels of carbon dioxide
C、scientists studied the contents of an ice core from Antarctica
D、the information can not be found by all means

答案D

解析
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