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题目材料:

Which of the following, if true, most weakens the argument?
  • AWhen grapes are grown in greenhouses, it is relatively easy to control the grape pests that thrive in air enriched with carbon dioxide.
  • B Recent improvements in pest control have increased grape yields in many vineyards.
  • CIncreasing carbon dioxide levels in greenhouses has not been shown to improve the quality of grapes grown in greenhouses.
  • DIncreasing carbon dioxide levels in greenhouses increases the sweetness of raisins made from grapes grown in the greenhouses.
  • EAs the carbon dioxide level in the open air increases, temperatures at the Earth's surface will also increase.

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