【求助GWD 一道假设题~~谢谢！~】

水色青空

30. GWD17-Q30:

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.

30. GWD17-Q30:
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?

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 Pennsylvania
does not vary with how expensive a restaurant is.
E.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.







我是按取非后削弱文章来做的，选的C~~但是答案选B~~~~B选项逻辑实在不清楚？~求助~~~
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 Pennsylvania
does not vary with how expensive a restaurant is.
E.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.















我是按取非后削弱文章来做的，选的C~~但是答案选B~~~~B选项逻辑实在不清楚？~求助~~~

gmatziyu

只有ｂ是削弱。饭店观点是在账单上写上ｔｈａｎｋ　ｙｏｕ的话会预测到ｔｉｐｓ增加
但是如果全部都写ｔｈａｎｋ　ｙｏｕ，　而客人组建习惯了之后还是按照以前的标准给ｔｉｐｓ（有些给，有些不给）
那么ｔｉｐｓ也不会增加。

水色青空

只有ｂ是削弱。饭店观点是在账单上写上ｔｈａｎｋ　ｙｏｕ的话会预测到ｔｉｐｓ增加
但是如果全部都写ｔｈａｎｋ　ｙｏｕ，　而客人组建习惯了之后还是按照以前的标准给ｔｉｐｓ（有些给，有些不给）
那么ｔｉｐｓ也不会增加。

-- by 会员 gmatziyu (2010/2/27 0:07:24)

C为什么不可以呢？是不够直接还是不正确？

水色青空

http://gmatclub.com/forum/penssylvania-restaurant-gmat-prep-question-82045.html