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（x2）4的展开式中常数项是 ．
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高三下学期数学《》真题及答案
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的展开式中各项系数的和为2则该展开式中常数项为.
的展开式中各项系数的和为2则该展开式中常数项为.
的展开式中常数项是____________
已知展开式的二项式系数之和为64则其展开式中常数项是__________.
已知展开式中常数项为240其中a是小于零的常数则展开式中各项的系数之和是____________.
已知的展开式中第三项与第五项的系数之比为则展开式中常数项是________.
已知的展开式中只有第四项的二项式系数最大则展开式中常数项等于
的展开式中各项系数的和为2则该展开式中常数项为
-40
-20
20
40
的展开式中各项系数的和为243则该展开式中常数项为.
若展开式中二项式系数之和为64则展开式中常数项为
20
－160
160
―270
已知展开式中常数项为5670其中是常数则展开式中各项系数的和是
28
48
28或48
1或28
3x+6的展开式中常数项为用数字作答.
已知的展开式中只有第六项的二项式系数最大1求该展开式中常数项2求展开式中系数最大的项为第几项
的展开式中各项系数的和为2则该展开式中常数项为
的展开式中常数项为
已知a>0的展开式中常数项为240则x＋ax－2a2的展开式中x2项的系数为________.
x2+6的展开式中常数项是.用数字作答
已知展开式中只有第4项的二项式系数最大则展开式中常数项为_______.
已知2x++a6a∈Z的展开式中常数项为1则m+an8的展开式中含m3n5的项的系数为______.
的展开式的二项式系数之和为64则展开式中常数项为.
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StudentsinCaldwellIdahocanattendclassintheirpajamas睡衣!AtVallivueVirtualAcademycoursesaretaughtonline.Studentsworkathomewithparentswhoserveaslearningcoaches.Acertifiedteacher1thestudents'progress. Thecyberschoolwas2asafreeoptionforstudentsinkindergartenthroughgrade8whohavetroublesucceedinginthedistrict's3publicschool.Supportersoftheprogramsaythatvirtualschoolshelpstudentsavoidthesocialpressuresthatcan4withlearning.Inadditionsupportersargueonlinecoursesprovidekidswithmorefocused5andcourseoptionsthantheycangetinatypicalschool. Noteveryonegivescyberschoolsapassinggradehowever.Someeducatorsarguethatonlinelearningmakesithardforstudentstomakefriends.Manyparentsalsofeelthatcyberschoolsput6timedemandsonthembecausetheyhavetooverseetheirkids'dailywork. Technologycanbenefiteducationbutitshouldn't7education.Studentswhogotovirtualschoolswillmissmanyofthebenefitsofbeinginarealschool. Ifkidsattendschoolonlinetheywillmissoutonimportantsocial8.PaytonMcdonough13aseventhgraderfromGlencoeIll.agrees.Idon'tknowhowIcouldsitatacomputeralldaywithout9interactingwithmypeersandteachershesays. Inadditionvirtualschoolsdon'thaveenoughstructure.Studentswhotakeonlinecoursescansettheirownscheduleswhichwillcauseproblemsforstudentswhohavetroublestaying10. Furthermoreonlineschoolingputsstressonparentsbecausetheyhaveto11whattheirkidsdoathome.Manyparentshavefull﹣timejobs.Howaretheygoingtoruntheirchildren'seducation12intheirjobsandtakecareoftheirotherresponsibilitiesathome? Virtualschoolswillmakeitharderforstudentstolearnandwillputtoomuchpressureonparents. Virtuallearningdoesnotneedtoreplaceclassroomlearning13butitcanhelpstudentsworkattheirownpace.Ifstudentsstrugglewithsubjectstheycantakethosecoursesonlineandspendmoretimeonthem.Virtualschoolscanalsoofferstudentsmuchmore14schedules.Studentsoftenhandleextracurricularactivitiessportsandschoolworkandcyberschoolscouldhelpthemmanageeverything. Finallyattendingvirtualschoolcanpreparestudentsforcollegeandforworkafter15.WeneedtoberesponsibleforworkingonourownsaysAngelaGosciloaseniorfromPoundRidgeN.Y.Weneedtodeveloptechnologyskillsthatwillhelpusinwhateverwedo.Gettinganearlystartisagoodidea. 1A.oversees B.suspected C.admitted D.predicted 2A.tolerated B.launched C.undergone D.transformed 3A.virtual B.superior C.traditional D.specialized 4A.agree B.putup C.go D.interfere 5A.attention B.definition C.foundation D.instruction 6A.unlimited B.uncivilized C.unrealistic D.unaffected 7A.turnto B.takeover C.takein D.makeup 8A.interactions B.education C.occupation D.identification 9A.actually B.presently C.naturally D.logically 10A.examined B.motivated C.exhausted D.represented 11A.compliment B.award C.supervise D.tempt 12A.negotiate B.innovate C.control D.excel 13A.entirely B.partially C.regularly D.purposely 14A.sustainable B.flexible C.relevant D.optimistic 15A.school B.study C.graduation D.education
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IhadateacherwhousedtowakeusupinclassbyshoutingTheearlybirdgetstheworm!Isaylethimhavetheworm.Ihatefoodthatdoesn'tstaystillandavoidJapaneserestaurantsforthatveryreason.AnywayIstoppedeatingwormsattheageofthreeswitchingtoregularbreakfastsofcereal谷物towhichIwouldaddextrasugar. RecentlyIwasthinkingaboutearlybirdsandthecompetitivespiritafterreceivingaletterfromareaderinMalaysiaMysondeliberatelythrowsawaymarksbecausehedoesn'tliketobetopoftheclass.WhatshallIdo?Givehimaroundofapplauseforbeingsmart!ActuallymanychildreninAsiatendtobethefocusbyperformingbetter. PlacedintoaverycompetitiveclasswhenIwas11Iquicklylearnedtheidealpositionwassecondtolast.Thetopthreeperformersandtheverylastpersonarehighlightedthesecond﹣to﹣lastcontestantisINVISIBLE.Andifsaneasypositiontoget～justdeliberatelyunderperformateverytest.Icoulddothat.Ioncecamesecondtolastineightstraightsportsdayraces.Noonesuspectedanything.IwassoinvisiblethatIcouldhaverobbedabankinmystreetandnoonewouldhavenoticed. AttheLondonOlympicsafewmonthsagobadmintonpairsfromthreeAsiancountriesdeliberatelytriedtolosematchestodrawgoodlotsinlaterrounds.Itwasfunnytowatchbuttheywereallthrownoutforpoorsportsmanship.Whattheyreallyneededwereactinglessonstheirmovesweresounconvincing.OopsIhittheballinentirelythewrongdirection. TheotherdayItookthechildrenoutandtheyracedforthecar.I'mfirstsaidone.ThesecondsaidFirstisworstsecondisbest.TogethertheysangatthelastoneAndthird'stheonewithahairychest. Itstruckmethattheorganizersofsportsmatchescouldusethissongwhenpeopledeliberatelylosematches.Ilostthedelightedloserwillsay.ThejudgescouldstilldeclarethemwinnerspointingtoanewoptionalregulationFirstisworstsecondisbestthird'stheonewithahairychest. 1WhydidtheauthordislikeJapaneserestaurant? A.Itsfoodwasservedraw. B.Itsfoodcontainedworms. C.Hewastemptedbycereal. D.Hewasaffectedbythesaying. 2Howdidtheauthormanagetobeinvisibleinacompetitiveclass? A.Hehighlightedthetopthreestudents. B.Hecametosecondinsportsraces. C.Hehidhimselfinabankskillfully. D.Heintentionallyunderperformed. 3Whatcanbelearnedfromthepassage? A.Thejudgeisencouragedtoeliminatethedishonestplayers. B.PlayersdisqualifiedfromOlympicdoublesforusingdrugs. C.Children'ssongpraisesthedramaticactingskillsofathletes. D.Playerspurposefullyfailedforeasierlotsinthefollowingrounds. 4Whichsayingmighttheauthorpossiblysupport? A.Greatmindsthinkalike. B.Godfavorsthosewhoareprepared. C.Honestyisthebestpolicy. D.Abirdinhandisworthtwointhebush.
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UNIQLO'sfoundertriestofindawaytobeatZaraandH&M WhenaskedwhatguideshisvisionofUNIQLOTadashiYanaiitsfounderandchiefexecutivepullsofftheshelfthe1987autumn/wintercollectioncatalogueofNextamass﹣marketBritishretailer.Alloftheclothesareso1hesaysthattheycouldbeworntoday.WhileZaraofSpainandH&MofSwedenfollowfashiontrendswithouthavinganyoriginalthoughtUNIQLOofJapan2totimelessbasics. Mr.Yanaihasa/an3baseathomefromwhichtodevelopintohisWesterncompetitors'mainmarketsofEuropeandAmerica.Butinsteadhis4remainsAsia.Asiaistheengineofgrowthtodayhesayspointingtothemillionsofconsumersacrossthe5whoarereachingthemiddleclass.UNIQLOwillopenitsfirstshopinIndiathisyearandisconsidering6intoVietnamandothercountriesithasalreadyopenednetworksofshopsinIndonesiaSingaporeandThailand. ThesuccessornotofUNIQLO'soverseasoperations7greatlytoinvestorsathome.FastRetailing'sshares﹣Mr.Yanaiownsjustover20%ofthefirm﹣havebeenrisingsince2015analystsestimatelargelyowingtoitsinternationalexpansionandimprovedlogistics物流.Athomethefirmisclosingstoresbecausethepopulationis8.LastyearUNIQLO'sinternationalprofitsovertookits9salesforthefirsttimeanditsforeignoperatingprofitsalmostequaleditsJapaneseequivalent. ThoughtheyareverydifferentmarketsEuropeandAmericaofferacautionarytale.UNIQLOinAmericastruggledoutsidethebigcitiesoftheeastandwestcoasts.GrowthinAmericaremains10forUNIQLOboththereandinEurope.HoweverMr.YanaianenthusiasticfanofglobalizationisconfidentthathecanguideUNIQLOthroughthechangesneeded.
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WhenJenniferLawrencetrippedonherwaytoacceptherbestactressOscaroneyearherpinkprincess—likeDiordress1captureinallitsglory.Theunscriptedmomentbecamehottopicthroughoutsocialmedia. Thatbonusair—timeforasingledressatoneoftheworldsglobaleventsispricelessforthelikesofDioroneofthe2influentialfashionhousesintheluxurymarketplace. Successontheredcarpetcanearnexposureandprofitsforluxurybrandsforyears3come.TheredcarpetwhichwillbetelevisedlivebeforeAcademyAwardceremonypresentsagreatopportunityforadesignertoreachanaudiencethatexpands4thefashionsetting.TheLawrencedressreceivedabout40millionmentionsonvarioussocialmedia. Onewayofestimatingthemonetarybenefitsofhavingastandoutdressontheredcarpetistocomparehowmuchabrandwouldotherwisespendoncommercialadvertisingduringthesametime.5Lawrencehadonly75secondsofsolocameratimeforherOscaracceptancespeechDiorhadtopaymorethan$4millionforacommercialspotofthesamedurationonsimilaroccasions.Andthisdidn'tincludethetime6devotetoLawrenceandherdressonthepre—showtelevisedredcarpet.Lawrence23hadanadvertisingcontractwithDior.7thegroup'sdealwithLawrenceaffecteditssaleswasclearlystatedinitsannualfinancialreport.Thatyearthegroupclothingsection'sprofits8total165millioneurosup26percentfromthepreviousyear. Hestonthefounderofapublicityfirm9successstoriesincludeintroducingJimmyChooshoesanddesignerSaabtoHollywoodbelievesthattheOscarredcarpetistodaydominatedbyestablishedluxurybrands.Findingitmuchmoredifficulttocompetewithbigbrandnamestodresssuperstarsonbigeventsmanyyoungdesignersturnto10betonpromisingrisingstarsexpectinganovernightsuccessiftheyoungstarsrisetosuddenfame.
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ThebiggesthouseofcardsthelongesttongueandofcoursethetallestmantheseareamongthethousandsofrecordsloggedinthefamousGuinnessBookofRecords.Createdin1955afteradebate1concernEurope'sfastestgamebird2beganasamarketingtoolsoldtopublandlords3promoteGuinnessanIrishdrinkbecamethebestsellingcopyrighttitleofalltimeacategorythatexcludesbookssuchastheBibleandtheKoran.Intimethebookwouldsell120millioncopiesinover100countries﹣quitealeapfromitshumblebeginnings. Initsearlyyearsthebooksetitssightson4satisfyman'sinborncuriosityaboutthenaturalworldaroundhim.ItstwoprincipalfactfinderstwinsNorrisandRossMcWhirtermovedwildlyaroundtheglobetocollectfacts.Itwastheirtasktofindanddocumentaspectsoflifethatcanbesensedorobservedthingsthatcanbequantifiedormeasured.Butnotjustanythings.Theywereonlyinterestedinsuperlativesthebiggestandthebest.Itwasduringthisperiod5someoftheremarkableGuinnessRecordsweredocumentedansweringsuchquestionsasWhatisthebrighteststar?andWhatisthebiggestspider? Onceawareofthepublic'sthirstforsuchknowledgethebook'sauthorsbegantobranchouttocoverincreasinglydoubtfullittle﹣knownfacts.Theystarteddocumentinghumanachievementsaswell.AforerunnerforrealitytelevisiontheGuinnessBookgavepeople6chancetobecomefamousforaccomplishingoddoftenpointlesstasks.Recordsweresetin1955forconsuming24raweggsin14minutesandin1981forthefastestsolvingofaRubik'sCubewhichtookamere38seconds.In1979amanyodeled用真假嗓音交替唱non﹣stopfortenandaquarterhours. Initslatestappearancethebookhasfoundanewhomeontheinternet.Nolonger7restricttothelimitsofphysicalpapertheGuinnessWorldRecordswebsitecontainsseeminglyinnumerablefactsconcerningsuchtopicsasthemostpowerfulcombustion燃烧engineortheworld'slongesttrain.Whatisstrikinghoweveristhatsuchfactsarefoundsharingapagewiththerecordoftheheaviesttraintobepulled8abeard. OriginatingasasimplebarbooktheGuinnessBookofRecords9evolveoverdecadestoprovideinsightintothefullrangeofmodernlife.Andalthoughonemaybe10likelynowtolearnaboutthewidesthumanmouththanthehighestnumberofcasualtiesinasinglebattleoftheCivilWartheGuinnessWorldRecordswebsiteoffersatellingglimpseintothefutureoffact﹣findingandrecord﹣recording.
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18和24所有的公约数的和是所有公约数的积的
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A.Onereasonthatit'surgentisthatcountriesaresendingmoreandmoreobjectsintospace. B.Therearealsomillionsofsmallerpiecesofjunkthatwecan'tsee. C.Blowingupoldersatelliteswithamissilemaycreatethousandsofsmallerpieces! D.Intheupperpartsoftheatmosphereitwillburnup. E.Whentwoobjectsinspacecollidethetwoobjectsbreakintomanysmallerpieces. F.Yearsofspaceexplorationhavelefttonsofspacejunkinorbitaroundtheplanet. ManypeopleknowthattrashisabigproblemonplanetEarth.Whatmanypeopledon'tknowisthattrashhasbecomeaprobleminouterspacetoo.1Statisticallytherearemorethan22000piecesofjunkinspacearoundtheearth.Andthesearejusttheitemsthatwecanseefromthesurfaceoftheearthbytelescopesorradars.2Objectslikebitsofoldspacerocketsorsatellitesmovearoundtheplanetatveryhighspeedssofastthatevenaverysmallpiececanbreakimportantsatellitesorbecomedangeroustopeopleparticularlyastronauts.Ifthetiniestpieceofjunkcrashedintoaspacecraftitcoulddamagethevehicle.That'sbecausethefasteranobjectmovesthegreatertheimpactiftheobjectcollideswithsomethingelse. Tohelpminimizeadditionalspacejunkcountriesaroundtheworldhaveagreedtolimitthetimetheirspacetoolsstayinorbitto25years.Eachtoolmustbebuilttofallsafelyintotheearth'satmosphereorthemassofgasesthatsurroundtheearthafterthat.3Manyscientistsarealsoproposingdifferentwaystocleanupspacejunk.TheGermanshavebeenplanningaspacemissionwithrobotsthatwouldcollectpiecesofspacetrashandbringthembacktoEarthsothattheycanbesafelydestroyed. Inouropiniontheproblemisverychallengingandit'squiteurgentaswellsaidMarcoCastronuovoanItalianSpaceAgencyresearcherwhoisworkingtosolvetheproblem.4Manyoftheseobjectsaretoolsthathelppeopleusetheircellphonesorcomputers. Thetimetoactisnowaswegofartherintimewewillneedtoremovemoreandmorefragmentshesays.
DirectionsReadthefollowingpassage.Summarizethemainideaandthemainpointsofthepassageinnomorethan60words.Useyourownwordsasfaraspossible.LonelinessPeaksForyearsAmericahasbeentalkingaboutobesitybutanewstudypointstoamoreserioushealthissueisolationandloneliness.Beingconnectedtootherssociallyiswidelyconsideredafundamentalhumanneed﹣crucialtobothwell﹣beingandsurvival.Extremeexamplesshowinfantswholackhumancontactincarefailtogrowandoftendie.Indeedsocialisolationhasbeenusedasaformofpunishment.AccordingtoJulianneHolt﹣LunstadtheleadauthorofthestudyanincreasingportionoftheU.S.populationnowexperiencesisolationregularly.Over42millionadultsaboveage45intheU.S.areestimatedtobesufferingfromchronic长期的loneliness.Thestudyof340adultsbetweentheagesof27and101livinginSanDiegoidentifiedthreekeyagerangeswhenpeoplefelttheloneliest.Participantswhohadthehighestlevelsoflonelinesswereintheirlate﹣20smid﹣50sandlate﹣80s.Whileitmaycomeasasurprisethatpeopleintheirlate﹣20ssufferedfromlonelinessalargersurveyshowstheyactuallymaysufferthehardest.Withanincreasingnumberofpeopleworkingfromhomewatchingtelevisiongettingintoanaddictiontoelectronicdevicesithasbecometooeasytobealoneevenifthat'snotaperson'sintention.Moderndayconvenienceslikehavinganythingwewantdeliveredmakeitpossibletoneverneedtoleavethehouse.Sonotsurprisinglythosewithfrequentsocialcontactusuallyfeellesslonelythanthosewithfewsocialties.Mountingevidencesuggestssocialisolationandlonelinesssignificantlyimpactourhealthandevenshortenourlivesjustlikeobesity.Thisstudyisn'tthefirsttimelonelinesshasbeenflaggedasanemerginghealthissue.Thereforereducingbothisolationandlonelinessisimportantforqualityoflifeandwell﹣being.
MiltonHersheywasbornnearthesmallvillageofDerryChurchPennsylvaniain1857.Heonlyattendedschoolthroughthefourthgradeatthatpointhewasapprenticed做学徒toaprinterinanearbytown.AfterawhilehelefttheprintingbusinessandwasapprenticedtoaLancasterPennsylvaniacandymaker.AndattheageofeighteenheopenedhisowncandystoreinPhiladelphia.Inspiteofhistalentsasacandymakertheshopfailedaftersixyears. AfterthefailureofhisPhiladelphiastoreMiltonheadedforDenverwherehelearnedtheartofmakingcaramels焦糖.TheninDenverMiltononceagainattemptedtoopenhisowncandy﹣makingbusinessesinChicagoNewOrleansandNewYorkCity.Finallyin1886hewenttoLancasterPennsylvaniawhereheraisedthemoneynecessarytotryagain.Thiscompany﹣theLancasterCaramelCompany﹣establishedMilton'sreputationasamastercandymaker. In1893MiltonattendedtheChicagoInternationalExpositionwherehesawadisplayofGermanchocolate﹣makingimplements.FascinatedbytheequipmenthepurchaseditforhisLancastercandyfactoryandbeganproducingchocolatewhichheusedforcoatinghiscaramels.Bythenextyearproductionhadgrowntoincludecocoasweetchocolateandbakingchocolate.TheHersheyChocolatecompanywasbornin1894asasubsidiary子公司oftheLancasterCaramelCompany.SixyearslaterMiltonsoldthecaramelcompanybutreservedtherightsandtheequipmenttomakechocolate.Hebelievedthatalargemarketofchocolateconsumerswaswaitingforsomeonetoproducereasonablypricedcandy.Hewasright. MiltonHersheyreturnedtothevillagewherehehadbeenbornintheheartofdairycountryandopenedhischocolatemanufacturingplant.Withaccesstoallthefreshmilkheneededhebeganproducingthefinestmilkchocolate.TheplantthatopenedinasmallPennsylvaniavillagein1905istodaythelargestchocolatefactoryintheworld.Thesweetscreatedatthisfacilityarefavoritesaroundtheworld. TheareawherethefactoryislocatedisnowknownasHersheyPennsylvania.WithinthefirstdecadesofitsexistencethetownofHersheythrivedasdidthechocolatebusiness.Abankaschoolchurchesadepartmentstoreevenaparkandatrolleysystemallappearedinshortorderthetownsoonevenhadazoo.TodayavisittothearearevealstheHersheyMedicalCenterMiltonHersheySchoolandHershey'sChocolateWorld﹣athemeparkwherevisitorsaregreetedbyagiantReesesPeanutButterCup.Allofthesethings﹣andahugenumberofhappychocolatelovers﹣weremadepossiblebecauseacaramelmakervisitedtheChicagoExpositionof1893! 1Thementionofthe1893Expositionindicatesthat A.theexpositioninChicagoisheldonceeverythreeyears. B.thethemeoftheexpositionof1893wasFoodfromAroundtheWorld. C.theexpositioncontaineddisplaysfromavarietyofcountries. D.thesiteoftheexpositionisnowabranchoftheHersheyChocolateCompany. 2AccordingtothepassageMiltonHersheysoldhiscaramelcompanyin A.1894. B.1900. C.1904. D.1905. 3Whatcanyouinferfromthepassage? A.Chocolateispopularineverycountryintheworld. B.ReesesPeanutButterCupsaremanufacturedbytheHersheyChocolateCompany. C.ChocolatehadneverbeenmanufacturedintheUnitedStatesbeforeMiltonHersheydidit. D.TheHersheyChocolateCompanynowmakesmoremoneyfromHershey'sChocolateWorldthanfromthemanufactureandsaleofchocolate. 4Theauthorwrotethispassagemainlyto A.recountthefoundingoftheHersheyChocolateCompany. B.describetheprocessofmanufacturingchocolate. C.comparethepopularityofchocolatetoothercandies. D.explainhowapprenticeshipswork.
比的前项不能是0．判断题
暴饮暴食被一些人认为是缓解工作压力的手段.regard
Whilefakingandfiercelooksareamonganimalsgreatdefensesmanyspeciesknowthateveryonerunsfromabigstink臭气too. Vulture秃鸳 Vulturesarestreetsweepersthatfeastontherottingfleshofdeadanimalswhichbenefitsusbyriddingourhighwaysandlandscapesofanimalbodiesandthebacteriatheymightcarry.Whenvulturesfeelthreatenedtheyvomitandthesmellofvomited—ondeadbodiesputsofmostpredators.Throwingupallowsthevulturetoflyawaymorequickly—andthevomitcanhurttheaggressor'seyesandface. Opossum负鼠 Insomewaysopossumshaveiteasy.Inordertobecomedeadtheydon'thavetofaxanyoneadeathcertificate.Theyjustlietherewiththeirtongueshangingoutwiththesmellofdeadfleshsometimesforhourseffectivelyconvincingpotentialpredatorstheycanfindamuchfreshermealelsewhere.Eveniftheykeepgettingattackedtheywon'tmoveanymorethanahumanstatueuntilthethreathaspassed. Hoatzin磨雉 Holdyournoseandmeetthehoatzinabirdofdistinctionsnottheleastofwhichisthatitsmellslikefreshcowshit.Theanimalmostlyeatsleavesandit'stheonlybirdknowntodigestbyfermentationlikeacow.Thisprocessiswhatcausesitssmellandhasearneditthenicknamethestinkbird. Millipedes千足虫 Millipedesaretricky.Forstarterstheylookwormy.TheirnameisdeceptivetooTheirlegsnumberabout750.Theirmajordefenseistocurlupintoaball.Theythoughalsoreleaseaharmeyesandleaveahorriblesmellontheirattackers. SeaHare海兔 Thegracefulseahareisplainintasteinthefirstplacesoit'snotthemostpopulardishintheseafoodchain.Nonethelessthistypeofseacreaturehasaprettycreativesmell—relateddefensethatisalmosttheoppositeofitssmellycompanionsonthislist.Theseaharegivesoutaslimypurpleinkthesubstancewhichmakesfoodlesspalatabletopredators. Researchersusinglobsters2—fasmodelpredatorsfoundthattheseablocksthelobstersreceptivemechanism.Inotherwordstheseaharegivesitsattackertheequivalentofastuffynosesotheydon'tknowhowappealingitis. 1Theseaharedefendsitselffrompredatorsby. A.becomingplainintasteatthediscoveryofapredator B.givingoutpurpleinktomakeitselfinvisibletopredators C.releasingsubstancetomakepredatorsunabletosmellit D.givingoffsmellygastotrytodrivepredatorsaway. 2WhichofthefollowingstatementsisTRUEaccordingtothepassage? A.Thevulturecarriesbacteriasothatpredatorsdarenotgetclosetoit. B.Theopossumfakesitsdeathtoavoidbeingtargetedbypredators. C.Thehoatzineatscowshitsothatitisnick—namedasstinkbird D.Thegasreleasedbymillipedewasbasicallyharmless 3Thespeciesthatenjoysmorethanonedefensemechanismis A.vulture B.opossum C.millipede D.seahare
我想当时你一定具有控制自己行为的能力.power
Fromthenation'searliestdaysfarminghasheldacrucialplaceintheAmericaneconomyandculture.Farmersplayanimportantroleinanysocietyofcoursesincetheyfeedpeople.Butfarminghasbeenparticularly1intheUnitedStateswithintensifiedattentionfromciviliansandgovernmentaswell. Earlyinthenation'slifefarmerswereseenasexemplifyingeconomic2suchashardworkperseveranceandself—sufficiency.MoreovermanyAmericansparticularlyimmigrantswhomayhaveneverheldanylandinthecountryfoundthatowningafarmwasthe3toentertheAmericaneconomicsystem.Theywereimmediatelyplayingapartinthecountry'seconomy. TheAmericanfarmerhasgenerallybeenquitesuccessfulatproducingfood.Indeedsometimeshissuccesshascreatedhisbiggestproblemtheagriculturalsectorhassufferedperiodicexplosionsofoverproductionthathave4prices.Whenthegovernmenthavetostepinand5theworstoftheseevents. Americanfarmersowetheirabilitytoproducelargeyieldstoanumberoffactors.Foronethingtheyworkunder6naturalconditions.TheAmericanMidwesthassomeoftherichestsoilintheworld.Rainfallis7overmostareasofthecountryriversandundergroundwaterpermitextensiveirrigationwhereitisnot. Increasinguseofhigh—quality8laboralsohavecontributedtothesuccessofAmericanagriculture.Itisnotunusualtoseetoday'sfarmers9plowsorharvesters.Onefarmercanmanagelargelandsoffarms.Fertilizersandpesticidesarecommonlyusedalthoughsomeenvironmentalists10it.Computerstrackfarmoperationsandeven11technologyisutilizedtofindthebestplacestoplantandfertilizecrops.USagricultureisamongthemostadvancedintheworld. Farmersstillfightwithforcesbeyondtheircontrol12.DespiteitsgenerallybenignweatherNorthAmericaalsoexperiencesfrequentfloodsanddroughts.Changesintheweathergiveagricultureitsowneconomiccyclesoften13thegeneraleconomy.Whennegativefactorshitfarmerscallsforgovernmentassistanceareparticularlyintense.Inthe1930sforinstancebadweatherandtheGreatDepressioncombinedtopushfarmsovertheedgeintoan14situation.Thegovernmentrespondedwith15agriculturalreforms——mostnotablyasystemofpricesupportswhosesignificancetowardthelarge—scalecampaignlastedformanyyears. 1Avalued B.accessed C.implemented D.illustrated 2A.regulations B.virtues C.obligations D.requirements 3A.shortcut B.implication C.reward D.substitute 4A.maintained B.margined C.depressed Drefunded 5A.takeover B.coverupfor C.comeupwith D.smoothout 6A.varied B.favorable C.extreme D.visible 7A.moderate B.predictable C.timely D.acid 8A.labor Binvestment C.chemical D.landscape 9A.complicated B.flexible C.accessible D.executive 10Acriticize B.recall C.evaluate D.identify 11A.medical B.mobile C.space D.process 12A.forexample B.inall C.however D.additionally 13A.subjectto B.unrelatedto C.reducedto D.appliedto 14A.vague B.desperate C.isolated D.feasible 15A.struggling B.traditional C.sweeping D.permanent
A.Theanimalstosomeextentbecometoolstous. B.Althoughviolenceagainstzooanimalsisoftenreportedtheissueofanimalwelfarehasarousedlittleattentionrecently. C.Bytakingaselfieyoushowthatyou'repartofthatexperience. D.Thecomparisonbetweencagedanimalsandwildonesareappealingtopeople. E.Similarincidentsarearegularoccurrenceinnaturalsettings. F.Thecommonfactoristhatsomepeoplearenotrespectinganimal. Recentlyinthequestforaselfie自拍awomanclimbedovertheconcretebarrierofaJaguar美洲虎enclosureatWildlifeWorldZooArizona.Thejaguarrippedintoherarm.Bystanderspulledherawaybeforetheanimalcouldinjureherfurther.She'sfine—soisthejaguar. Thisisn'tthefirsttimeastoryofapersonactingrudelytogetclosetoawildanimalmadeheadlines.Lastyear.amanjumpedintoalionenclosureatazooforaclose—upphoto.1MultipletouristsinYellowstoneNationalParkhavebeenattackedbybison野牛whenthey'vegottentoocloseforaphoto. It'scommonsensenottogetclosetowildanimalsthatcanhurtyou.It'swhyzooshavebarriers—sometimesmultiplewalls—tokeeppeopleseparatedfromanimals.Signspostedeverywherestatetheobviouswarning.Keepyourhandsoffthecage. Yetanimalshavebecomelessrealtoussaysanenvironmentalist.Weseeexoticanimalsmostfrequentlyinmanagedsettingslikezoos.2Peoplearetryingtotakeadvantageoftheirraritytoshowoffonsocialmediaandignoretheirfierceness. Mediaoftennormalizeinteractionwithdangerousanimals.SeeingamanlikeLionWhispererKevinRichardsonregularlyplay—fightwithlionsonTVmaysendthemessagethattheseanimalsaren'tsodangerousafterall. Socialmediaarealsoperfectlypositionedtocontributetotheriseofanimalselfies.Gettinglikesandcommentsprovideinstantsatisfaction.Yourself—esteemactuallygetsatemporaryboost.Toholdontothatfeelingpeoplemaygotomoreandmoreextremestoshowcasethemostexcitingversionsofthemselves.Itmaynotbeenoughtogetaphotoofabeautifuldangerousanimalfromoutsideacage.3 People'scarelessapproachcanputtheanimal'ssafetyatriskaswell.Zooanimalsoftenmustbekilledtoprotectthepersonwho'senteredtheirspace.Infactthrill—seekersactivelyendangerthelivesofanimals.4withthezooenvironmenttheytakeitforgrantedthatanimalsarethereforpeopleignoringthefactthatanimalsandhumansarebothequalexistentsinthenature.
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