【OG24-670题】Brown tides are growths of algae on the sea's surface that prevent sunlight from reaching marine plants below, thereby destroying not only the plants but also the shellfish that live off these plants. Biologists recently isolated a virus that, when added to seawater, kills the algae that cause brown tides. Adding large quantities of this virus to waters affected by brown tides will therefore make it possible to save the populations of shellfish that inhabit those waters. Which of the following, if true, provides the most support for the conclusion of the argument_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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Brown tides are growths of algae on the sea's surface that prevent sunlight from reaching marine plants below, thereby destroying not only the plants but also the shellfish that live off these plants. Biologists recently isolated a virus that, when added to seawater, kills the algae that cause brown tides. Adding large quantities of this virus to waters affected by brown tides will therefore make it possible to save the populations of shellfish that inhabit those waters.

Which of the following, if true, provides the most support for the conclusion of the argument

When applied in large quantities, the virus not only kills the algae that cause brown tides but also many harmless kinds of algae. Marine animals that prey on shellfish avoid areas of the sea in which brown tides are occurring. The number of different kinds of virus present in seawater is far greater than many marine biologists had, until recently, believed. The presence of large quantities of the virus in seawater does not adversely affect the growth of marine plants. The amount of the virus naturally present in seawater in which brown tides occur is neither significantly greater nor significantly less than the amount present in seawater in which brown tides do not occur.

正确答案： D

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题干翻译
棕潮中的藻类不仅破坏植物，还破坏以这些植物为生的贝类。生物学家最近分离出一种病毒，加入海水后能杀死引发棕潮的藻类。因此，向受棕潮影响的水域添加大量这种病毒将有可能拯救生活在这些水域中的贝类种群。 逻辑链
Virus kill algae → Save shellfish 问题类型
增强题 推理过程
论点是添加病毒能拯救贝类种群，论据是病毒能杀死引发棕潮的藻类。要增强该结论，需说明添加病毒对贝类种群没有其他负面作用或者对贝类生存环境有积极作用。 选项分析
A选项：病毒大量使用时不仅杀死引发棕潮的藻类，还杀死许多无害藻类。这可能会破坏生态平衡，对贝类生存产生不确定影响，无法增强，排除。 B选项：捕食贝类的海洋动物避开棕潮发生区域。与添加病毒能否拯救贝类种群无关，话题不一致，排除。 C选项：海水中病毒种类数量与添加这种病毒能否拯救贝类种群没有直接关系，排除。 D选项：海水中大量病毒的存在不会对海洋植物的生长产生不利影响。因为贝类以植物为生，保证了植物生长不受影响，也就有利于贝类生存，补充论据增强了结论，当选。 E选项：棕潮发生水域和未发生水域中自然存在的病毒量比较，与添加病毒能否拯救贝类种群无关，排除。

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