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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.
不确定这题是什么推理，我还以为是因果
如果是类比推理的话，类比对象为：A, randomy write thank you; B, regularly write thank you. 如果A, B确定是相似的，A的性质（customers tip higher）就能推给B。 所以选项应该strenthen二者相似，即 regularly write thank you 也不会让顾客改变tip habit （就像他们randomly看到thankyou一样）
说得好好，没看清楚题目是在比较randomly 和 regularly 的比较，我以为是枚举。。。
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