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　　Theteacherwashavingahistoryclass.Shewasaskingoneofher71Cstudentssomequestions,butnoneoftheanswerswas72Ccorrectly.SotheteacherbegantoaskSamsomeveryeasyquestions,andshehopedthathecouldgiveatleastonecorrectanswer.

　　“Now,Sam,”saidtheteacher,“WhatisWaterloo（滑铁卢）?”“Waterloo?”saidtheboy.“Oh,it‟sakindof73Awashingmachine,Ithink.”

　　Theteacherwassurprised.Sheasked74Danotherquestion,“Sam,nowgivemetheanswertoaveryeasyquestion:WhoisWashington?”

　　“Washingtonmustbethemanwhousesthatmachine,”Samanswered.Theteacherwasangrybutthensheaskedthethirdquestion,“Whoisthepresident75AoftheUnitedStatesnow?”Samthoughtfora76Alongtime,buthehadn‟tanyideaatall.Thentheteachershouted,“Obama!”Samlookedroundandsatdown.“Standup!”theteachercried,“Ididn‟t

　　77Btellyoutositdown!”Samsaid,“Oh,I‟msorry.Ithoughtyouwerecallingthenextstudent.”

　　望采纳

　　谢了，不过已经做完了。。。