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河南省郑州市2023-2024学年下学期期中测评试卷（高一）英语试卷答案

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B26-year-oldSteBurkewasonhiswayhomewhenthreemencameuptohimaskingifhewantedtobuyabike.Theyweretryingtosellthef1,350bikeforf100.Notonlythat,Burkerealizedthattheremustbesomethingwrongbecausetherewasstillalockonthebike.ThenBurkeimmediatelyboughtitfor￡80.Afterheboughtthebike,Burkepostedaphotoofittosocialmediainhopesoffindingthefirstowner."Hasanyonelosthis/herbike?Ijustboughtthisbikeforf80andit'sgotabikelockonit.Itisclearthatit'sfromtheCrosbyarea.Iknowit'saf1,350bikeandI'dbeheartbrokenifitwasmine,"wroteBurke.Withinhours,Burkereceivedaphonecallfromawomanwhoknewthebike'sowner.Amanwhosehousehadbeenburgled(入室偷窃)earlierthatverysameweeklosthisbike.Sincethemanhadsavedupmorethanf1,350ofhisownmoneytobuythebike,hewasverythankfulforitsreturn.ThemantriedtopayBurkethef80,butBurkerefused,"Ididn'tfeelrightacceptingmoneyfromamanwhohadjusthadhishousebrokeninto."Burkehassincebeenshoweredwithsocialmediapraiseforhishonesty,althoughhesaysoverandoverthathedidnotreturnthebikeformediaattention.AnownerofabicyclestoreofferedtogiveBurkeabikeforfreeasareward(forhishonesty.24.WhatdidBurkethinkofthebikewhenthethreementriedtosellit?A.Heguesseditmustbestolen.B.Hefelthehadseenitsomewhere.C.HethoughtitwasabikewithpoorqualityD.Hethoughtitcouldbeboughtatalowerprice.25.HowdidBurketrytofindtheownerofthebike?A.Byfollowingthethreemen.B.Bysearchingbicyclestores.C.Byaskingforpublichelp.D.Byaskinghisneighbors.26.Whydidn'tBurkeacceptthef80fromtheownerofthebike?A.Hecouldgetabikeforfree.B.Hefeltpityforhissuffering.C.Hethoughtitwasnotbigmoney.D.Hedidn'twanttodrawpublicattention.27.WhichofthefollowingcanbestdescribeBurke?A.Generousandconfident.B.Braveandstrong.C.Cleveranddetermined.D.Calmandkind-hearted.CAseriesofsmallearthquakeshaveshakencentralNebraskaandbecomethetalkofthearea.Accordingtotheinformationonawebsite,therehavebeenseveralquakessincethe9ththismonthintheheartofthestate,centeredonthetownArnold,whichisabout225mileswestofthecapital第4页，共10页

分析根据三角函数的性质，即可求出函数的定义域．

解答解：要使函数f（x）=$\frac{1}{cosx}$$+\frac{1}{sinx}$有意义，
则$\left\{\begin{array}{l}{cosx≠0}\\{sinx≠0}\end{array}\right.$，
解得x≠$\frac{π}{2}$+kπ，且x≠kπ，k∈Z，即x≠$\frac{kπ}{2}$
∴函数的定义域为{x|x≠$\frac{kπ}{2}$，k∈Z}
故答案为：{x|x≠$\frac{kπ}{2}$，k∈Z}

点评本题考查了函数的定义域求法，关键是掌握三角形函数性质，属于基础题．

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