Cotton grass, which grows only in arctic regions, has been the only summertime source of protein available to caribou. Caribou that do not get adequate amounts of protein in the summer are unable to reproduce the following year. Rising average temperatures in arctic regions, however, are causing cotton grass to disappear. Therefore, if the warming trend continues, caribou are likely to become extinct.
Which of the following is an assumption on which the argument depends?
  • Acotton grass is the only one of the caribou’s food sources that is becoming scarce as temperatures rise in arctic regions.
  • Bcaribou that do not eat enough protein to reproduce do not live as long as caribou that do
  • CThe warming trend in arctic regions will not enable other plants capable of providing protein to caribou to grow there.
  • DThe caribou is the only animal that depends on cotton grass as a major source of food.
  • EIf the warming trend continues and cotton grass disappears from arctic regions, then cotton grass will be extinct.
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网友解答

感谢由Evej用户对此题目的解答所做出的贡献。

解析:该题问文章论证依据的假设。文章结论是:如果变暖趋势持续,C物种会灭绝。按照攻击结论的思路,我们考虑什么情况下C物种不会灭绝:变暖导致其他植物提供C物种必须的蛋白质营养。文章的假设自然就是把可能破坏结论的可能性取非,得到C选项。
当前版本感谢由Evej等的贡献

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