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标题: 不懂正确选项怎么成为原文的假设 [打印本页]

作者: bunnyfdu2015 时间: 2014-7-15 16:18
标题: 不懂正确选项怎么成为原文的假设

In a study conducted in Pennsylvania, 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 Pennsylvania regularly wrote "Thank you" on restaurant bills, 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 Pennsylvania does not vary with how expensive a restaurant is.
	Virtually all patrons of the Pennsylvania restaurants in the study who were given a bill with "Thank you" written on it left a larger tip than they otherwise would have. 排除法选的B，正确答案B，但是不知道B怎么就成了原文的假设啦？

作者: HermanLu 时间: 2014-7-16 10:03
是不是这个意思？就是经常见到 "Thank you" 养成了每次都多付tip的习惯，即使以后没有 "Thank you" 还是会多付
如果这样不成立的话，就有可能看不看 "Thank you" 都没区别了

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