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题库 / Prep2012-CR-54
In a study conducted in Canada, servers in various restaurants wrote "Thank you" on randomly selected bills before presenting the bills to their customers. Tips on these bills were an average of three percentage points higher than tips on bills without the message. Therefore, if servers in Canada regularly wrote "Thank you" on restaurant their average income from tips would be significantly higher than it otherwise would have been.
Which of the following is an assumption on which the argument relies?
The "Thank you" messages would have the same impact on regular patrons of a restaurant as they would on occasional patrons of the same restaurant.
Regularly seeing "Thank you" written on their bills would not lead restaurant patrons to revert to their earlier tipping habits.
The written "Thank you" reminds restaurant patrons that tips constitute a significant part of the income of many food servers.
The rate at which people tip food servers in Canada does not vary with how expensive a restaurant is.
Virtually all patrons of the Canadian restaurants in the study who were given a bill with "Thank you" written on it left a larger tip than they otherwise would have.
assumption是strengthen的一种，选项取反会削弱选项的是答案。
题目观点：因为在随机选定的账单上写thank you，会得到更多的小费，所以如果服务员在账单上经常写thank you，那么他们的平均收入会要比不写thank you的时候要搞很多。
A 在常客和生客身上的效果一样，无关
B 取反后的意思是，在账单上看到thank you看多了以后，顾客给小费的习惯会退回到之前的习惯，就是不给消费了。取反之后会削弱，所以是答案。
C thank you的心理作用，无关。
D 给消费的概率跟餐馆贵不贵无关。题目中没有提到餐厅是什么样子的。
E 几乎所有的常客都给了更多的小费。跟是不是所有的常客没有关系。
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