2. 外语
  3. The passage is primarily concerned with______ The passage suggests which of the following about coral reef communities?

The passage is primarily concerned with______ The passage suggests which of the following about coral reef communities?

admin2009-04-18  50
问题 The passage is primarily concerned with______
The passage suggests which of the following about coral reef communities?
选项 A、Coral reef communities may actually be more likely to thrive in waters that are relatively low in nutrients.
B、The nutrients on which coral reef communities thrive are only found in shallow waters.
C、Human population growth has led to changing ocean temperatures, which threatens coral reef communities.
D、The growth of coral reef communities tends to destabilize underwater herbivore populations.
E、Coral reef communities are more complex and diverse than most ecosystems located on dry land.
答案A
解析 This question asks you to identify what the passage suggests about coral reef communities. The best answer is A. The first paragraph of the passage describes how coral reef communities have survived in nutrient-poor waters. Lines 21-22 go on to state that recent “Declines in reef communities are consistent wit observations that nutrient input is increasing” in habitats occupied by coral reefs. Thus, the passage suggests that coral reef communities are more likely to survive in nutrient-poor waters. Both B and C can be eliminated because the passage does not state that human population growth has led to changing ocean temperature, nor does it state that the nutrients on which coral reef communities thrive are found only in shallow waters. Choice D is incorrect because the passage states that destabilized herbivore populations are a symptom of the decline of coral reef communities rather than a result of the growth of coral reef communities. Choice E can also be eliminated because the first sentence of the passage states that coral reefs “are one of the most fragile, biologically complex, and diverse marine ecosystems on Earth”; it does not, however, discuss the complexity of coral reefs communities in the context of ecosystems on dry land.
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