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题目选项分析

Which of the following most logically completes the passage?

Leaf beetles damage willow trees by stripping away their leaves, but a combination of parasites and predators generally keeps populations of these beetles in check. Researchers have found that severe air pollution results in reduced predator populations. The parasites, by contrast, are not adversely affected by pollution; nevertheless, the researchers` discovery probably does explain why leaf beetles cause particularly severe damage to willows in areas with severe air pollution, since __________.

【选项】the damage caused by leaf beetles is usually not enough to kill a willow tree outright

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题目基本信息

  • 所属科目:逻辑CR
  • 题目来源1:OG18-语文分册-151
正确率: 0% 中等