OG12 Diagnostic中2道冷门CR求教(19, 24)[solved]

tintinc · 发表于 2011-2-11 23:31:12

真心求教。。。我搜了好久也没有搜到一个可以理解的答案。题目和疑问如下：
19. Prolonged spells of hot, dry weather at the end of the grape-growing season typically reduce a vineyard's yield, because the grapes stay relatively small. In years with such weather, wine producers can make only a relatively small quantity of wine from a given area of vineyards. Nonetheless, in regions where wine producers generally grow their own grapes, analysts typically expect a long, hot, dry spell late in the growing season to result in increased revenues for local wine producers. analysts’
Which of the following, if true, does most to justify the analysts’ expectation?
A. The lower a vineyard’s yield, the less labor is required to harvest the grapes.
B. Long, hot, dry spells at the beginning of the grape-growing season are rare, but they can have a devastating effect on a vineyard's yield.
C. Grapes grown for wine production are typically made into wine at or near the vineyard in which they were grown.
D. When hot, dry spells are followed by heavy rains, the rains frequently destroy grape crops.
E. Grapes that have matured in hot, dry weather make significantly better wine than ordinary grapes.
提问：E中质量提高，我们假设如果产量大量下降的话，年收入也未必提高啊？另外，题干中Nonetheless, in regions where wine producers generally grow their own grapes, 这个提到grow their own grapes和开头提到的vineyard对解题有意义吗？

24. The percentage of households with an annual income of more than $40,000 is higher in Merton county than in any other county. However, the percentage of households with an annual income of $60,000 or more is highest in Sommer county.
If the statements above are true, which of the following can properly be concluded on the basis of them?
A. No households in Merton county has an annul income of $60,000 or more
B. Some households in Merton county have an annual income between $40,000 and $60,000
C. The number of households with an annual income of more than $40,000 is greater in Merton than in Sommer county.
D. Average annual household income is higher in Sommer than in Merton county.
E. The percentage of households with an annual income of $80,000 is higher in Sommer than in Merton county
提问：排除法可得B。但是有一个疑问，Merton的$40,000以上最高百分比，题干中没有信息可以证明Merton存在比方说$40,001~$60,000的收入人群。囧。。。不知我表述清楚我的疑问了没有。。。

谢谢大家了先

boozy · 发表于 2011-2-12 00:42:10

19题排除法 A 成本减少不等于收入增加，无关；B更无关；C文中说的是local wine producer，跟其它地方的没关系；D属雪上加霜型，证明不了什么；只剩下E了，只好选它。注意原文， reduce a vineyard's yield，很平淡。而选项，用了significantly better 这样夸张的词，你还用担心吗?没看出出题人怕你没看到都快急了吗？另外，题目中说的是increased revenues for local wine producers, not revenues of vineyard owners. 明白了？

24题你想得真可笑。M县年入超4万（含6万）的比例比其它县（含S县）高, S县超过6万的比例比M县高,所以M县在4至6万收入之间必须有活人存在，否则M县年入超4万就和年入超6万的人就一样多了，超4万和超6万的比例是同一个数字，也就不可能出现S县超过6万的比例比M县高。

tintinc · 发表于 2011-2-12 00:56:51

谢谢ls解答，24题我也被自己囧到了。。。脑子da错了

jyw0411lsq · 发表于 2011-2-15 22:48:49

楼主，给你个非常好用的方法，我是才发明的，希望对你有用~
还是高中两个班级，A, B班级考数学，分数结果如下，A班 80以上的比B多， B班90以上的比A多，
A班 80-90 设为1， 90以上为2， B班80-90为3,90以上为4，
根据要求列不等式，1+2.》3+4， 2《4，
所以得到1》3，而且是1比3大很多才行，~
这个好处是根据题目得到不等式，自己用数学解，省去了繁琐的思维步骤~~~

jyw0411lsq · 发表于 2011-2-15 22:52:55

可以联想高中我们学习的统计学，两个群体都在各个数段上有分配，题目说的是其中的两个区间的比较，也就是样本的分布，至于半分比，可以按早人数去理解就行，因为M,S两个都不知道人数的基数是多少，百分比没有多大意义了

zhyanqun · 发表于 2011-2-16 01:56:28

多谢你的解释。
我觉得E应该是正确的答案，但是对于A（ The lower a vineyard’s yield, the less labor is required to harvest the grapes. ）我有一点不理解为什么A是错的。
首先，我觉得题目是要找一个充分条件，只要可能导致利润提高的答案都是对的。
利润提高，或者因为卖的价格高了（比如答案E），或者是成本降低了（例如答案A）。但它们都不是必要条件：就像楼主说的，如果葡萄产量大幅下降，即使葡萄酒卖出天价来，也可能是亏损。所以我觉得E也只是一个充分条件，如果是这样的话，A为什么不行呢？

joananna · 发表于 2011-2-22 02:06:17

19 还是不明白为什么减产就会导致“significantly better wine”来。产量少了质量就高？？

mongmong · 发表于 2011-10-14 11:22:08

revenue is revenue; profit is profit.

yzhao2xiaotong · 发表于 2015-2-24 11:44:20

mongmong 发表于 2011-10-14 11:22
revenue is revenue; profit is profit.

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OG12 Diagnostic中2道冷门CR求教(19, 24)[solved]

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