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发布时间：2006-06-23 17:07     点击：

　　2. The passage suggests which of the following about coral reef communities?

　　(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.

　　3. The author refers to "filter-feeding animals" (line 20) in order to

　　(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

　　4. According to the passage, which of the following is a factor that is threatening the survival of coral reef communities?

　　(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.

　　5. It can be inferred from the passage that the author describes coral reef communities as paradoxical most likely for which of the following reasons?

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