请教一道题目，欢迎建言

HoganTong

In the last decade there has been a significant decrease in coffee consumption. During this same time, there has been increasing publicity about the adverse long-term effects on health of the caffeine in coffee. Therefore, the decrease in coffee consumption must have been caused by consumers' awareness of the harmful effects of caffeine.

Which of the following, if true, most seriously calls into question the explanation above?

A. On average, people consume 30 percent less coffee today than they did 10 years ago.
B. Heavy coffee drinkers may have mild withdrawal symptoms, such as headaches, for a day or so after significantly decreasing their coffee consumption.
C. Sales of specialty types of coffee have held steady as sales of regular brands have declined.
D. The consumption of fruit juices and caffeine-free herbal teas has increased over the past decade.
E. Coffee prices increased steadily in the past decade because of unusually severe frosts in coffee-growing nations.



这道题C选项我认为也是正确的。如果咖啡销量下降是因为人们意识到咖啡因有害，那么应该所有品牌的咖啡销量都下降，因为所有品牌的咖啡都含咖啡因。如果高端品牌保持不变，低端品牌下降，则说明品牌可能是下降的原因。
有两个常见的反驳C选项的说法在此先毙掉：
说法一：高端不变，低端下降，正说明总销量下降，和题干愿意是一致的，没有weaken。
毙掉原因：记住GMAT的CR弱化题中从来不质疑既定事实，而是质疑原因分析，C选项是在质疑销量下降的原因，即C选项认为原因不是人们意识到咖啡因有害，而是可能和品牌相关。
说法二：可能高端品牌咖啡因含量低，所以C是strenghthen。
毙掉原因：想象力太丰富。

spicytaco

结论说： 咖啡消费量下降应该是人们意识到咖啡因的害处
问削弱

C只是说大品牌趋于稳定，其他都下降
这能说明啥？ 只能说明销量下降而已。结论是”咖啡因的危害”导致人减少喝咖啡，我们要证明和这点没关系。。找他因。
楼主想象力太丰富了
Ｅ说咖啡价格在过去十年由于霜冻导致减产而稳定增加。。这就是个他因，削弱结论

spicytaco

按楼主的逻辑。这都是是削弱了

D. The consumption of fruit juices and caffeine-free herbal teas has increased over the past decade.
...大家都去喝果汁了而已，所以coffee下降了。。爱好变了


A. On average, people consume 30 percent less coffee today than they did 10 years ago.
平均上人们对咖啡消费比十年前降低30%,,,只是没喝那么多了而已...可能没以前那么爱喝了，或者没以前那么好喝了

HoganTong

spicytaco 发表于 2018-12-11 07:29
结论说： 咖啡消费量下降应该是人们意识到咖啡因的害处
问削弱

还是没有解释那个问题，如果咖啡因有害是咖啡销量减少的原因，那么所有品牌的咖啡都应该销量下滑，因为所有品牌都含咖啡因
我是经济专业的所以我选的也是E，但较真的话选E需要假设咖啡不是Giffen good，即咖啡的需求随价格上升而下降，这已经超出题目范围了。

HoganTong

spicytaco 发表于 2018-12-11 07:59
按楼主的逻辑。这都是是削弱了

D. The consumption of fruit juices and caffeine-free herbal teas has i ...

D.多喝果汁和少喝咖啡之间没有必然逻辑联系，如果A成立，需要加一个很强的假设：人一天只能和定量的液体且所有人都满负荷喝液体，那么一种液体变多肯定导致另一种减少。
A.复述既定事实的选项，没有提供insight的选项在CR中一律是错的，不用看