今天做了2道题目，对于那个Verbal满分的薰衣草MM所说的CR错误选项特征中的“无故将完整的集合分成子集加以比较“。深有体会。
都来自PREP08-PRACTICE 2.
(1). 82 (33511-!-item-!-188;#058&007598) Technological improvements and reduced equipment costs have made converting solar energy directly into electricity far more cost-efficient in the last decade. However, the threshold of economic viability for solar power (that is, the price per barrel to which oil would have to rise in order for new solar power plants to be more economical than new oil-fired power plants) is unchanged at thirty-five dollars. Which of the following, if true, does most to help explain why the increased cost-efficiency of solar power has not decreased its threshold of economic viability? A. The cost of oil has fallen dramatically. C. Technological changes have increased the efficiency of oil-fired power plants. 我错选A,答案是C.原文说的是new oil-fired power plants的economical的问题，不是说的是作为子集的the cost of oil的问题。正确答案C直接给出increase the efficiency of oil-fired power plants.直截了当。
(2).94. (31867-!-item-!-188;#058&006654) Because of steep increases in the average price per box of cereal over the last 10 years, overall sales of cereal have recently begun to drop. In an attempt to improve sales, one major cereal manufacturer reduced the wholesale prices of its cereals by 20 percent. Since most other cereal manufacturers have announced that they will follow suit, it is likely that the level of overall sales of cereal will rise significantly. Which of the following would it be most useful to establish in evaluating the argument? A. Whether the high marketing expenses of the highly competitive cereal market led to the increase in cereal prices D. Whether the prices that supermarkets charge for these cereals will reflect the lower prices the supermarkets will be paying the manufacturers 我错选A,答案是D.原文说批发价格减少，预计了个销售量。其实就是这个方向问下想要知道的销售价格。A中提到的marketing expenses是影响销售价格的一个子集。但是还是没有直接摆到supermarkets的价格（其实就是销售价）直截了当。
哈哈。分享一下。
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