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GRE阅读逻辑题训练(38)

2017-03-29 16:10:00来源:新东方在线整理

  为了帮助大家练习GRE阅读逻辑题,新东方在线GRE频道为大家带来GRE阅读逻辑题训练(38)一文,希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!

  Ounce for ounce, blends of different artificial sweeteners match any individual artificial sweetener in sweetening power. When used to sweeten food, bleeds greatly decrease the likelihood that consumers will exceed acceptable daily intakes for individual sweeteners. Blends should therefore be used, rather than single sweeteners alone, since blends are clearly more healthful, yet equally effective.

  The argument above depends on which of the following assumptions?

  A:When ingested together, different artificial sweeteners in the blends do not interact in a way that makes them harmful to human health.

  B:Different artificial sweeteners, when used together in food, do not contribute a more desirable flavor to the food than would any one of them by itself.

  C:The acceptable daily intake for any given artificial sweetener is a conservative figure that could probably be greatly exceeded at little or no risk.

  D:Consumers who substitute artificial sweeteners for sugar in their diets generally keep track of their daily intake of different sweeteners.

  E:The ill effects on health produced by the intake of excessive quantities of any single artificial sweetener cannot be reversed by reducing intake later.

  最佳解析:

  我们利用上面的这道assumption题来分析实战中的解题步骤。首先读清楚上文中推理,虽然文章很长,但文中最后三行使用了since,therefore,所以前提和结论均在此。“因为混合物更健康并且同样有效,所以应当使用混合物”。首先寻找选项谓语中的否定词,(A)、(B)、(E)符合,然后看原因和结果的关键词,原因,结果主语都是blend,而原因的重点为healthful and equally effective。五个选项中涉及blend的只有(A),涉及healthful也只有(A),无选项涉及effective,所以(A)一定是最可能的选项。仔细体会(A),混合物在一起消化不会相互作用对人体有害。在判断时,加入否定词not入(A)中,与其中已有的否定词抵消,意为混合物在一起时相互作用对人体有害,那么推理必不成立,则(A)一定正确。由上可见,在无法准确判断是否成立是任何假设题中都适用的方法。

  答案:A

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