- 阅读理解A
题干：InAmericaalone,tippingisnowa$16billion-a-yearindustry.Arecentpollshowedthat40%ofAmericansloathe(厌恶)thepractice.Consumersactingrationallyoughtnottopaymorethantheyhavetoforagivenservice.Tipsshouldnotexist.Sowhydothey?Theconventionalwisdomisthattipsbothrewardtheeffortsofgoodserviceandreduceuncomfortablefeelingsofinequality.Thebettertheservice,thebiggerthetip.ButaccordingtonewresearchfromCornellUniversity,tippingnolongerservesanyusefulfunction.Thepaperanalysesdatafrom2,547groupsdiningat20differentrestaurants.Thecorrelationbetweenlargertipsandbetterservicewasveryweak:onlyatinypartofthevariabilityinthesizeofthetiphadanythingtodowiththequalityofservice.Customerswhoratedamealas"excellent"stilltippedanywherebetween8%and37%ofthemealprice.Tippingisbetterexplainedbyculturethanbyeconomics.InAmerica,thecustomhasbecomeinstitutionalized:itisregardedaspartoftheacceptedcostofaservice.InaNewYorkrestaurant,failingtotipatleast15%couldwellmeanabusefromthewaiter.Hairdresserscanexpecttoget15－20%,themanwhodeliversyourgroceries$2.InEurope,tippingislesscommon；inmanyrestaurants，discretionary（自由决定的）tippingisbeingreplacedbyastandardservicecharge.InmanyAsiancountries,tippinghasneverreallycaughtonatall.Howtoaccountforthesenationaldifferences?AccordingtoMichaelLynn,theCornellpaper'sco-author,countriesinwhichpeoplearemoreextrovert,sociableorneurotictendtotipmore.Tippingrelievesanxietyaboutbeingservedbystrangers.And,saysMr.Lynn,"inAmerica,wherepeopleareoutgoingandexpressive,tippingisaboutsocialapproval.Ifyoutipbadly,peoplethinklessofyou.Tippingwellisachancetoshowoff."Icelanders,bycontrast,donotusuallytip--ameasureoftheirintroversion,nodoubt.Whilesuchexplanationsmaybecrude,thehardtruthseemstobethattippingdoesnotwork.Itdoesnotbenefitthecustomer.Nor,inthecaseofrestaurants,doesitactuallyencouragethewaiter,orhelptherestaurantmanagertomonitorandassesshisstaff.Servicepeopleshould"justbepaidadecentwage",whichmayactuallymakeeconomicsense.
题目： In the third paragraph, several data are quoted in order to（）. - A 、show the different tipping level between different jobs
- B 、compare cultural difference between America and Europe
- C 、show the tipping custom has become institutionalized
- D 、tell us the Standardized tipping level in several cases
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参考答案【正确答案：C】
从第3段第2句“In America, the custom has become institutionalized”可推知，后面引用的数据都是说明作者的这个观点。
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