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题目材料:

Which of the following describes research that is most clearly analogous to the testing done by GRIP scientists?
  • AScientists studying the formation of the Sahara desert measure the rate of topsoil erosion in the region
  • BScientists seeking to determine the age of a particular fossil measure the percentage of its carbon atoms that have decayed
  • C Scientists researching vision in flies measure and compare the amounts of vitamin A found in the retinas of several fly species.
  • DScientists investigating the development of life on Earth measure and compare the amount of oxygen used by various organisms along the evolutionary scale.
  • EScientists plotting the fluctuations in rainfall in the early rain forests measure the presence of certain gases trapped in tree rings of older trees.

E显示答案

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