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题目材料:

Which of the following best expresses the main point of the passage?
  • AAccurate projections of crop yields in a carbon dioxide-rich world are not likely to become feasible.
  • BThe impact of changes in atmospheric carbon dioxide levels on crop yields cannot be accurately predicted from current experimental data.
  • CThe total amount of food available to sustain the world population is likely to decline if levels of atmospheric carbon dioxide double.
  • DChanges in atmospheric carbon dioxide levels will affect population levels of crop pests as much as they affect growth rates of plants.
  • EFew crops are likely to benefit from the changes in levels of atmospheric carbon dioxide that are anticipated.

B显示答案

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