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发布时间：2006-06-23 17:07     点击：

　　(A) They are thriving even though human activities have depleted the nutrients in their environment.

　　(B) They are able to survive in spite of an over- abundance of algae inhabiting their waters.

　　(C) They are able to survive in an environment with limited food resources.

　　(D) Their metabolic wastes contribute to the degra- dation of the waters that they inhabit.

　　(E) They are declining even when the water sur- rounding them remains clear.

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