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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?

A. 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.

B. Regularly seeing “Thank you" written on their bills would not lead restaurant patrons to revert to their earlier tipping habits.

C. The written “Thank you" reminds restaurant patrons that tips constitute a significant part of the income of many food servers.

D. The rate at which people tip food servers in Canada does not vary with how expensive a restaurant is.

E. 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.

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答案：

加拿大某项

研究，不同餐馆的服务生写“谢谢你”在给客户的账单上，这些账单的消费比没有这些信息的账单多3%的小费。因此，一般如果服务生写“谢谢你”，小费会大大增加假设题 A. “谢谢你”信息对常客和偶尔光顾的人有同样影响；取反无法削弱，排 B. 一般看到账单上的“谢谢你”不会让顾客回到原来的小费习惯；取反即会回到原来小费习惯，则削弱小费增加的结论，正确 C. “谢谢你" 提醒顾客小费占服务生收入很大一部分；客户会采取什么行动不得而知，排 D. 小费费率不会因为餐馆贵而变化；无关，排 E. 研究中的客户都对“谢谢你”账单给了更多小费；缩小范围，排