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[单选题]What is the main idea of the passage? ________
  • AThE.theory oF.relativity.
  • BExactness is thE.corE.oF.science.
  • CScientists arE.different from ordinary people.
  • DExactness ways oF.usinG.tools ar
  • EthE.keys to thE.makinG.o
  • FA.scientist.
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