OG12—94，求助

stucashS

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。。

yoyo9012

lz，我的感觉这里是用了反证法。

心理学家的解释是：看见信用卡标志会付更多钱是因为信用卡标志让付款人觉得他们的购买力远远超过他们的现金。

我的想法是这样：付款人有钱存在卡里，当看见了卡的标志，他们会想到他们的购买力比带的现金要多，所以会多付钱。

B举出了一个反例：那些有财政压力的人看见信用卡标志后付的钱更少了。
这就说明信用卡标志会让人联想到他们存的钱，存的多，小费就给的多，存的少，小费就给的少。

A：范围扩大。
C：削弱。
D：无关。

miachw901304

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

jiuwang

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