Thefriendshipbetweenhumansanddogspossiblybegan14000yearsago.Herearefourexamplesof"adog'slife"inthehumanworldtoday.TreatedlikeaqueenTiffyisoneofthesedogs.Herowner

　　Thefriendshipbetweenhumansanddogspossiblybegan14000yearsago.

　　Herearefourexamplesof"adog'slife"inthehumanworldtoday.

　　Treatedlikeaqueen

　　Tiffyisoneofthesedogs. HerownerNancyIaneLoewytreatsherlikeaqueen.ShepatientlypreparesTiffy'smealsofmeatfishchickenanddifferentkindsoffreshvegetables.Tiffyalsoeatsyoghurtandbiscuitsafterdinner.Loewy'shusbandhasaverygoodjobandhertwosonsareawayatuniversitysoshehasthetimeandmoneytotreatTiffyverywellandshetrulyenjoysdoingit."Iwanttogiveherthehealthiestmostwonderfullifeaslongaspossible"shesays.

　　FoodsnitTerdogs(嗅探犬)

　　FoodsnifferdogsworkatinternationalairportsintheUnitedStates.Theirjobistosmellandfindillegal(不合法的) fruitsvegetablesandotherfoodsinbagsandmail.Thesefoodssometimesbringinsectsanddiseaseswhichcouldbedangerousforplantsandanimals.Thedogcalmlysitsdownnexttoanythingthatsmellssuspicious(可疑的).Thedog'shumanpartnerthenchecksforillegalfoods.SnifFerdogsarefriendlyandcutesotheydon'tscarepeopleastheysniffthroughthecrowds.Moreimportantlythesedogshaveanastonishingnoseforfood.Theycanfindfoodinbags84%ofthetime.

　　Animalcarers

　　Jessieisawhippet(水灵狗)thatvisitsverysickchildreninhospital. SheshowsthemherloveandwhentheyfeeldownJessiemakesthemhappy.Jessiehelpspatientstostaystrongduringtheirtimeinhospital.

　　Therearemanydifferentkindsofanimalsthathelppeople. Wetrain"servicedogs" tohelppeoplewithphysicaldisabilities.Thebestknownservicedogsareguidesfortheblind. Buttheycanalsolearnto__________tumlightsonandoffpickupobjectsfromthefloorandevenpullwheelchairs.

　　Doggiedetectives(侦探犬)

　　Search-and-rescue(SAR)dogsusetheiramazingnosestofindpeople.Theycansmelltinyclues(绒索)thatpeopleleavewherevertheygo.Theseincludebacteria(细菌)smallpiecesofcloffiingandhairs.TheymayFmdmissinghikersandsearchthroughrubble(碎石) afterearthquakesandotherdisasters.

　　1.WhatfooddoesTiffyeat?

　　A.Onlyyoghurtandbiscuits. B.Anythingexceptvegetables