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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.
P1： In a study conducted in Canada, servers in various restaurants wrote "Thank you" on 【randomly随机 】selected bills before presenting the bills to their customers.
在加拿大进行的一项研究中，多家餐厅的服务员在向顾客出示账单之前，在【随机】选定的账单上写下“谢谢”。
P2： Tips on these bills were an average of three percentage points 【higher】 than tips on bills 【without the message --没有信息→小费少】.
这些账单上的小费比【没有信息】的账单上的小费平均高出三个百分点。
C： 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.
因此，如果加拿大的服务员经常在餐厅写“谢谢”，他们从小费中获得的平均收入将明显高于其他情况。
问题：assumption
思路1
【Regularly经常】 seeing "Thank you" written on their bills 【would not 否定词】lead restaurant patrons to revert to their 【earlier tipping habits--之前给小费的习惯=小费少】.
【经常】看到账单上写着“谢谢”【不会】导致餐厅顾客恢复他们之前的小费习惯。
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，少给小费，所以服务员收到的消费就少了。（取反之后，得出的新结论和原文结论相反，所以削弱原结论）
思路2：
类比推理：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）
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