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题目材料:

Select a sentence in the second paragraph whose function is to raise a possibility.
  • AAt first sight this would appear to be an early example of the type of scientific procedure proposed by Descartes in 1637 for eliminating all but one of a number of possible relationships.
  • BIn the ideal type of "critical" experiment, however, each "possibility" should be derived from existing data (or be a logical extrapolation of it) and the whole should be structured so that alternative possible explanations are excluded.
  • CFailure to satisfy these requirements reduces an experiment to a level of controlled empiricism.
  • DThis was the weakness of Lind`s work: the six "possible" cures that he compared were presumably selected empirically from those currently favored by ships` surgeons; he gives no indication that his choice was governed by any other consideration.
  • EHis experiment "succeeded" simply because one of the "remedies" contained vitamin C (the anti-scorbutic factor) whereas the other five did not.

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