2. 外语
  3. The passage is primarily concerned with______ The author refers to “filter-feeding animals” (line 20) in order to______

The passage is primarily concerned with______ The author refers to “filter-feeding animals” (line 20) in order to______

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问题 The passage is primarily concerned with______
The author refers to “filter-feeding animals” (line 20) in order to______
选项 A、provide an example of a characteristic sign of reef deterioration
B、explain how reef communities acquire sustenance for survival
C、identify a factor that helps herbivore populations thrive
D、indicate a cause of decreasing nutrient input in waters that reefs inhabit
E、identify members of coral reef communities that rely on coral reefs for nutrients
答案A
解析 This question asks you to identify the purpose of the author’s reference to filter-feeding animals. The best answer is A. In the second paragraph, the author asserts than human activities are adding nutrients to coral reef habitats, thus causing reef decline. In lines 18-20, the author identifies “an increasing abundance of … filter-feeding animals” as a typical symptom of this decline. Choice B can be eliminated because the way in which reef communities acquire sustenance for survival is described in the first paragraph of the passage, prior to the author’s reference to filter-feeding animals. Choice C is not the correct answer because filter-feeding animals are not identified as a factor that helps herbivore populations survive; in fact, destabilized herbivore populations and an increase in filter-feeding animals are signs of coral reef decline. Choice D can be eliminated because the passage indicates that an increase in filter-feeding animals is a symptom of coral reef decline that is brought about by an increase in nutrient input in coral reef habitats, not a decrease in nutrient input. Choice E can be eliminated also because the passage does not mention filter-feeding animals in order to identify coral reef community members that rely on coral reefs for sustenance.
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