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题目材料:

Which of the following most logically completes the passage?
  • Aeven where the damaging aluminum compounds are absent, grain plants still require a variety of nutrients in order to yield well
  • Bhigh concentrations of some metallic elements other than aluminum can also damage grain plants` roots
  • Cthe soil of some agricultural regions contains virtually no aluminum
  • Dany such population might have other unusual characteristics
  • Ethe damaging aluminum compounds do not form unless the soil is acidic

E显示答案

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