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求二元函数f(x,y)=x3+8y3-xy的极值。

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1

2

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试题分类: 社区工作人员
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Passage4 Questions16to20arebasedonthefollowingpassage: Cultureshockisanoccupationaldisease(职业病)forpeoplewhohavebeensuddenlytransplantedabroad. Cultureshockiscausedbytheanxietythatresultsfromlosingallfamiliarsignsandsymbolsofsocialintercourse.Thosesignsareasfollowing:whentoshakehandsandwhattosaywhenmeetpeople,whenandhowtogivetips,howtomakepurchases,whentoacceptandrefuseinvitations,whentotakestatementsseriouslyandwhennot.Thesesigns,whichmaybewords,gestures,facialexpressions,orcustoms,areacquiredbyallofusinthecourseofgrowingupandasmuchapartofourcultureasthelanguagewespeakorthebeliefsweaccept.Allofusdependonhundredsofthesesignsforourpeaceofmindandday-to-dayefficiency,butwedonotcarrymostatthelevelofconsciousawareness. Nowwhenanindividualentersastrangeculture,allormostofthesefamiliarsignsareremoved.Nomatterhowbroadmindedorfullofgoodwillyoumaybeaseriesofsupportshavebeenknockedfromunderyou,followedbyafeelingoffrustration.Whensufferingfromcultureshockpeoplefirstrejecttheenvironmentwhichcauseddiscomfort.Thewaysofthehostcountryarebadbecausetheymakeusfeelbad.Whenforeignersinastrangelandgettogetherincomplainaboutthehostcountryitspeople,youcanbesurethattheyaresufferingfromcultureshock. 16.Accordingtothepassage,cultureshockis. A.anoccupationaldiseaseofforeignpeopleB.mayleadtoveryserioussymptoms C.actuallynotadiseaseD.incurable 17.Accordingtothepassage,cultureshockresultfrom. A.thesuddenchangeofsocialatmosphereandcustoms B.thesuddenchangeofourdailyhabits C.thesuddenlossofourownsignsandsymbols D.thediscomfortthatwefeelwhenfacedwithaforeigner 18.Whichoneofthefollowingmaynotbeasymptomofcultureshock? A.Youdon’tknowhowtoexpressyourgratitude. B.Youdon’tknowhowtogreetotherpeople. C.Yousuddenlyforgetwhatawordmeans. D.Youdon’tunderstandwhyaforeignershrugs. 19.Accordingtothepassage,howwouldapersonwhostaysabroadmostprobablyreactwhenheisfrustratedbythecultureshock? A.Heismostlikelytorefusetoabsorbthestrangeenvironmentatfirst. B.Heisreallytoacceptthechangeandadapthimselftothenewenvironment. C.Althoughhetakestheculturedifferenceforgranted,hestilldoesn’tknowhowtodowithit. D.Hemaybegintohatethepeopleorthingsaroundhim. 20.Themainideaofthispassageisthat. A.cultureshockisanoccupationaldisease B.cultureshockiscausedbytheanxietyoflivinginastrangeculture C.cultureshockhaspeculiarsymptoms D.itisveryhardtocopewithlifeinanewsetting
试题分类: 大学英语四级
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