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MissEvanstaughtphysicsinschoolinLondon．Lastmonth56．＿＿＿＿＿shewasexplainingtooneofherclassaboutsound，and57．＿＿＿＿＿shedecidetotestthemtoseehowsuccessfulshehad58．＿＿＿＿＿beeninherwork．Shesaidtothem，“NowIhasasister59．＿＿＿＿＿inWashington．IfIwascallingherbythephone，and60．＿＿＿＿＿youwereontheothersideofthestreet．Whowould61．＿＿＿＿＿hearmefirst，mysisterandyou？Andwhy？”62．＿＿＿＿＿Acleverboyatonceanswered，“Yousister，Miss63．＿＿＿＿＿Evans，becausetheelectricitytravelsmuchfasterthansound64．＿＿＿＿＿waves．”“Verywell，”MissEvanspraised．65．＿＿＿___3Itisinterestedtovisitanothercountry，butsometimes56．＿＿＿therearesomequestionswhenwedon’tknowthelanguagevery57．＿＿＿well．Itmaybedifficulttotalkaboutthepeoplethere．Wemay58．＿＿＿notknowhowtousethetelephoneinthecountrywhichare59．＿＿＿visiting．Wemaynotknowwhattobuythethingsweneed．60．＿＿＿Inastrangecountrywemaynotknowwheretoeatandwhat61．＿＿＿toorderinarestaurant．Itisnoteasytodecidehowmany62．＿＿＿moneytotip（付小费）waitersortaxidrivers．Whenweare63．＿＿＿helpless，wemaynotknowhowtoaskhelp．64．＿＿＿Afterashorttimelater，however，welearnwhattodo65．＿＿＿andwhattosay．Welearntoenjoylifeinanothercountry，andthenwemaybesorrytoleaveboththeplaceandthepeople．4Longlongago，peoplehadgatherleavesand56．＿＿＿＿＿fruitofplantstoeatwith．Theydidn’tknowhow57．＿＿＿＿＿toplantcropsorhowtokeepanimalsfortheir58．＿＿＿＿＿food．WecallthemStoneAgepeople．Thingfor59．＿＿＿＿＿themwereterribleandhard．Nowtherehavestill60．＿＿＿＿＿somepeoplelivinglikedthoseStoneAgepeople．61．＿＿＿＿＿Theyliveinplacesthatarehardreach．Theydo62．＿＿＿＿＿notknowofourinvention，fortheykeepthemselves63．＿＿＿＿＿awayourcivilizedworld．Formanyyears64．＿＿＿＿＿agroupofpeoplecallAruntashavelivedalone65．＿＿＿＿＿inthecenterofAustralia．5Howrobins（知更鸟）knowwhenitistime56．＿＿＿＿＿togobacknorth？Theyseemtotellbyhowsoondaylightlasts．Inlatewinter，daylight57．＿＿＿＿＿beginstolastlongesteachday．Whenthe58．＿＿＿＿＿daylightlastslongenough，robinsstartnorth．59．＿＿＿＿＿Theyflybyday．Eachyeartheyfollowasame60．＿＿＿＿＿fly－way．Atfirst，theyflyonlyfewmilesa61．＿＿＿＿＿day．Theystopofteninthefieldtoeatbugs62．＿＿＿＿＿（小虫子）．Late，theyseeminahurry．Theyfly63．＿＿＿＿＿over100milesaday．Somearegoingsofar64．＿＿＿＿＿as180miles．Whentheygettohome，they65．＿＿＿＿＿alwaysstaytogetherhighinatree．6TheInternetisplayingaimportantpartin56．＿＿＿＿＿ourdailylife．Onthenet，wecanlearnabout57．＿＿＿＿＿newsbothhomeandabroadandsomeother58．＿＿＿＿＿informationsaswell．Wecanalsomakephonecalls，59．＿＿＿＿＿sendmessagesbye-mails，gotonetschools，and60．＿＿＿＿＿learnforeignlanguagesbyourselves．Beside，we61．＿＿＿＿＿canenjoymusic，watchsportsmatches，andplaythe62．＿＿＿＿＿chessorcards．Thenetevenhelpusdoshopping，63．＿＿＿＿＿makeachatwithothersandmakefriendswiththem．64．＿＿＿＿＿Inaword，theInternethasmadeourlifemoreeasier．65．＿＿＿＿＿7Peoplehavedifferenttastesinfood．Somefeeltheyhaven'tamealunlesstheyhavehad56．＿＿＿＿＿＿porkorothermeat；somepreferchickens57．＿＿＿＿＿＿orfish，andeatsoneortheotherateverymeal．58．＿＿＿＿＿＿Othersprefervegetablesandfruitsorgrainsbutwouldenjoyamealofpotatoes，59．＿＿＿＿＿＿noodlesandcarrotsandsomeanotherfruits．60．＿＿＿＿＿＿Otherscouldliveont...