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题目选项分析

Urban air contains more sulfur dioxide than does rural air, and plants in cities typically grow more slowly than do plants in rural areas. In an experiment to see how much of the difference in growth is due to sulfur dioxide, classes in an urban and a rural school grew plants in greenhouses at their schools and filtered the greenhouse air to eliminate sulfur dioxide. Plants in the urban greenhouse grew more slowly than those in the rural greenhouse.

Which of the following, if true, would it be most important to take into account in evaluating the result?

【选项】At both schools, the plants in the greenhouses grew much more quickly than did plants planted outdoors in plots near the greenhouses.

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题目基本信息

  • 所属科目:逻辑CR
  • 题目来源1:PREP07 Test 1-17
正确率:63%