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OG12—94,求助

Studies in restaurants show that the tips left by customers who pay their bill in cash tend to be larger when the bill is presented on a tray that bears a credit-card logo. Consumer psychologists hypothesize that simply seeing a credit-card logo makes many credit-card holders willing to spend more because it reminds them that their spending power exceeds the cash they have immediately available.
Which of the following, if true, most strongly supports the psychologists' interpretation of the studies?
A  The effect noted in the studies is not limited to patrons who have credit cards.
B  Patrons who are under financial pressure from their credit-card obligations tend to tip less when presented with a restaurant bill on a tray with a credit-card logo than when the tray has no logo.
C  In virtually all of the cases in the studies, the patrons who paid bills in cash did not possess credit cards.
D  In general, restaurants patrons who pay their bills in cash leave larger tips than do those who pay by credit card.
E  The percentage of restaurant bills paid with a given brand of credit card increases when that credit card's logo in displayed on the tray with which the bill is presented.

答案是B。完全不懂為什麽B能SUPPORT心理學家的解釋。。
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同意楼上,反证法。

有了A,就有B。

那么加强就是:没有A,就没有B。

因为加强是既不必要又不充分的,只要能增加结论成立的概率就可以选。。

非牛人的一点想法

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我的看法是,题目中隐含的一个假设条件是顾客看到信用卡的logo会有反应,B项正好从反面论证了这一点,所以起到了support的作用

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这道题E为什么不对呢??

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E说明了这个logo有品牌效应,即刺激消费相应品牌的credit card. 原题是讨论银行卡和cash pay的   所以是无关选项

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为什么D不对呢
是否D可以理解成,大部分付现金的比用信用卡的付小费的多,然后一看到有信用卡logo,就会付的比用现金的付的消费更多。从而证实了学者的论点:logo提示了人的支付能力

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个人理解是逆否命题=原命题(不知是否准确哈)

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