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　　Princessfish are a species of coral-reef fish that are captured alive by divers who first stun the individual fish by squirting a certain poison at them. Since the divers limit their catch to a few individuals and take care not to overfish, the divers’ continuing activities will clearly not result in serious harm to populations of princessfish.

　　Which of the following, if true, most seriously weaken the argument given?

　　A：Princessfish cannot be captured alive by traditional methods of fishing.

　　B：The poison used to stun the princessfish has no effect on humans who eat them.

　　C：Demand for princessfish has remained steady during the last decade.

　　D：Traces of the poison that remain in the seawater damage the corals that create and maintain the reefs on which princessfish depend.

　　E：Fish that have been stunned but have selected for capture by the divers soon recover from the temporary effect of the poison.

　　答案：D

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