【逻辑】GMAT逻辑考试机经：小费

　　GMAT逻辑考试机经：小费

　　【原始】

　　大量野鸟死亡，分析发现它们tissue中有大量pesticide残留，由此判断农药是野鸟死亡主因，所以政府决定对农药使用进行管制，问削弱 我选的是调查发现许多在死亡野鸟周围健康的野鸟体内也有农药，所以农药不是致死主因 (by abccd )

　　【考古】by 蓝梦红林

　　V1农药与鸟的问题

　　一个城市使用某种农药后，某种鸟的数量明显减少，解剖鸟的尸体后发现，体内农药残存量很高，一个组织建议政府通过法令禁止某农药的使用。

　　问驳斥：

　　答案：死掉的鸟体内的农药残留不比普通的鸟高

　　31 小费

　　【原始】

　　有道很像prep里的题。

　　就是餐厅服务员偶尔有时在bill上写了thank you的，说看到这些写了谢谢的bill的顾客给的钱会多一点。于是餐厅就决定在每一张bill上面都写上thank you。问evaluate这个效果还是assumption之类的。

　　我选了个答案就是说，顾客regularly看到这个bill还是会一样给更多钱。(by Yuna芋艿头)

　　【考古】by CECI

　　119. (28734-!-item-!-188;#058&003375) (GWD 17-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.

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