2. 外语
  3. The passage is primarily concerned with______ According to the passage, which of the following is a factor that is threatening

The passage is primarily concerned with______ According to the passage, which of the following is a factor that is threatening

admin2009-04-18  104
问题 The passage is primarily concerned with______
According to the passage, which of the following is a factor that is threatening the survival of coral reef communities?
选项 A、The waters they inhabit contain few nutrient resources.
B、A decline in nutrient input is disrupting their symbiotic relationship with zooxanthellae
C、The degraded waters of their marine habitats have reduced their ability to carry out photosynthesis
D、They are too biologically complex to survive in habitats with minimal nutrient input.
E、Waste by-products result in an increase in nutrient input to reef communities.
答案E
解析 This question asks you to identify a factor, mentioned in the passage, that is threatening the survival of coral reef communities. The best answer is E. In lines 16-18, the author indicates that waste by-products created by manufacturing increase the nutrient input in coral reef habitats. In lines 21-25, the author states that the increase in nutrient input is threatening the coral reef communities. Choice A can be eliminated because the first paragraph of the passage indicates that coral reef communities have thrived in nutrient-poor waters. Choice B can be eliminated because the second paragraph of the passage indicates that there has been an increase in the nutrient input in their habits, not a decline. Choice C is not the correct answer. Although the passage does indicate that the waters of coral reefs’ marine habitats have become degraded, the passage does not state that this degradation reduces the ability of coral reef communities to carry out photosynthesis. Choice D is incorrect because the passage does indicate that coral reef communities are complex, but it also states that they have been able to thrive in nutrient-poor waters.
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