【OG24-762题】Lockeport's commercial fishing boats use gill nets, which kill many of the netted fish, including some fish of endangered species. The fishing commission has proposed requiring the use of tent nets, which do not kill fish; boat crews would then throw back fish of endangered species. Profitable commercial fishing boats in similar areas have already switched over to tent nets. The proposal can therefore be implemented without economic harm to Lockeport's commercial fishing boat operators. Which of the following, if true, casts the most serious doubt on the argument made for the proposal?_mofa留学圈mofaGRE在线题库系统_GRE在线搜题_GRE题库解析_GRE真题机经_GRE课程_GRE培训机构

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Lockeport's commercial fishing boats use gill nets, which kill many of the netted fish, including some fish of endangered species. The fishing commission has proposed requiring the use of tent nets, which do not kill fish; boat crews would then throw back fish of endangered species. Profitable commercial fishing boats in similar areas have already switched over to tent nets. The proposal can therefore be implemented without economic harm to Lockeport's commercial fishing boat operators.

Which of the following, if true, casts the most serious doubt on the argument made for the proposal?

In places where the use of tent nets has been mandated, there are typically fewer commercial fishing boats in operation than there were before tent nets came into use. Even when used properly, gill nets require many more repairs than do tent nets. Recreational anglers in Lockeport catch more fish of endangered species than do commercial fishing boats. The endangered species of fish in Lockeport's commercial fishing area did not become endangered as a result of the use of gill nets by fishing fleets. The endangered species of fish caught by Lockeport's commercial fishing fleet are of no commercial value.

正确答案： A

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濒危物种。渔业委员会提议要求使用帐篷网（不会杀死鱼；船员会将濒危物种的鱼扔回）。类似地区盈利的商业渔船已经改用帐篷网。因此，该提议的实施不会对Lockeport的商业渔船经营者造成经济损害。 逻辑链
tent nets→no economic harm 问题类型
削弱 推理过程
论点是使用帐篷网对商业渔船经营者无经济损害，论据是类似地区已换用且盈利。需要找到能说明在Lockeport使用帐篷网会有经济损害的选项。 选项分析
A选项：在强制使用帐篷网的地方，商业渔船的运营数量通常比使用帐篷网之前少。意味着使用帐篷网可能导致渔船经营者业务规模缩小，有经济损害，削弱论点，当选。 B选项：刺网比帐篷网需要更多维修。说的是刺网维修情况，与帐篷网对Lockeport商业渔船经营者是否有经济损害无关，排除。 C选项：Lockeport的休闲垂钓者捕获的濒危物种鱼比商业渔船多。比较的是休闲垂钓者和商业渔船捕获濒危物种鱼的数量，与帐篷网的经济影响无关，排除。 D选项：Lockeport商业捕鱼区的濒危鱼类物种不是因渔船队使用刺网而濒危的。讨论的是濒危原因，和帐篷网的经济损害无关，排除。 E选项：Lockeport商业捕鱼船队捕获的濒危鱼类物种没有商业价值。未提及使用帐篷网的经济影响，排除。

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