选修作业-day刷题训练营

DAY10:Adultfemaleratswhohaveneverbeforeencounteredratpupswillstarttoshowmaternalbehaviorsafterbeingconfinedwithapupforaboutsevendays.Thisperiodcanbeconsiderablyshortenedbydisablingthefemale'ssenseofsmellorbyremovingthescent-producingglandsofthepup.Whichofthefollowinghypothesesbestexplainsthecontrastdescribed点分析AThesenseofsmellinadultfemaleratsismoreacutethanthatinratBTheamountofscentproducedbyratpupsincreaseswhentheyareinthepresenceofafemaleratthatdidnotbearthem.CFemaleratsthathavegivenbirtharemoreaffectedbyolfactorycuesthanarefemaleratsthathavenevergivenbirth.DAfemaleratthathasgivenbirthshowsmaternalbehaviortowardratpupsthatshedidnotbearmorequicklythandoesafemaleratthathasnevergivenEThedevelopmentofafemalerat'smaternalinterestinaratpupthatshedidnotbearisinhibitedbythrofthepup.Eachyearred-wingedblackbirdsstopinacertainregionofMidlandProvinceontheirspringandfallmigrations.Inthefall,theyeatasignificantportionoftheprovince'ssunflowercrop.ThisyearMidlandfarmerssoughtpermitstosetoutsmallamountsofpoisonedriceduringtheblackbirds'springstopinordertoreducethefallblackbirdpopulation.Someresidentsvoicedconcernthatthericecouldthreatencertainspeciesofraremigratorybirds.Nevertheless,thewildlifeagencyapprovedthepermits.Whichofthefollowing,iftrue,mosthelpstojustifythewildlifeagency'sapprovalofthepermits,giventheconcernsvoicedbysomeAIntheregionwherethered-wingedblackbirdsstop,theyarethe birdstobepresentinthespring.BThepoisonthatfarmerswanttousedoesnotkillbirdsbutrathermakesthemincapableofproducingviableeggs.CSincericeisnotraisedinMidlandProvince,fewspeciesofbirdsnativetotheprovincenormallyeatrice.DWithoutthepermit,anyfarmersshowntohavesetoutpoisonfortheblackbirdswouldbeheavilyfined.EThepoisonthatfarmersgotapprovaltousehasnotasteorsmellthatwouldmakeitdetectablebybirds.Inordertowithstandtidalcurrents,juvenilehorseshoecrabsfrequentlyburrowinthesand.Suchburrowingdiscouragesbarnaclesfromclingingtotheirss.Whenfullygrown,however,thecrabscanreadilywithstandtidalcurrentswithoutburrowing,andthustheyacquiresubstantialpopulationsofbarnacles.Surprisingly,inareaswheretidalcurrentsareveryweak,juvenilehorseshoecrabsarefoundnottohavesignificantbarnaclepopulations,eventhoughtheyseldomburrow.Whichofthefollowing,iftrue,mosthelpstoexplainthesurprisingATidalcurrentsdonotthemselvesdislodgebarnaclesfromthessofhorseshoecrabs.BBarnaclesmostreadilyattachthemselvestohorseshoecrabsinareaswheretidalcurrentsareweakest.CThestrengthofthetidalcurrentsinagivenlocationvarieswidelyoverthecourseofaday.DAverylargebarnaclepopulationcansignificantlydecreasetheabilityofahorseshoecrabtofindfood.EUntiltheyarefullygrown,horseshoecrabsshedtheirssandgrownewonesseveraltimesayear.4Parland'salligatorpopulationhasbeendeclininginrecentyears,primarilybecauseofhunting.AlligatorspreyheavilyonaspeciesoffreshwaterfishthatishighlyvaluedasfoodbyParlanders,whohadhopedthatthedeclineinthealligatorpopulationwouldleadtoanincreaseinthenumbersofthesefishavailableforhumanconsumption.Yetthepopulationofthisfishspecieshasalsodeclined,eventhoughtheannualnumbercaughtforhumanconsumptionhasnotincreased.Whichofthefollowing,iftrue,mosthelpstoexplainthedeclineinthepopulationofthefishspecies?AThedeclineinthealligatorpopulationhasmeantthatfisherscanworkinsomepartsoflakesandriversthatwereformerlytoodangerous.BOverthelastfewyears,Parland'scommercialfishingenterpriseshaveincreasedthenumberoffishingboatstheyuse.CManyParlanderswhohuntalligatorsdosobecauseofthehighmarketpriceofalligatorskins,notbecauseofthethreatalligatorsposetothefishDDuringParland'sdryseasonholesdugbyalligatorsremainfilledwithwaterlongenoughtoprovideasafeplacefortheeggsofthisfishspeciestohatch.分析D选项：EInseveralneighboringcountriesthroughwhichParland'sriversalsoflow,alligatorsareatriskofextinctionasaresultofextensivehunting.Denoma,amajorconsumer-electronicsmaker,hadasizeabledeclineinsalesrevenueforitsmostrecentfiscalyear.Thisresultappearssurprising,becauseelectronicsretailersreportthatalthoughtheiroverallsaleswereconsiderablylowerthaninthepreviousyear,theirsalesrevenuefromDenomamodelsactuallygrew,largelythankstosomeinnovativeandpopularmodelsthatDenomaintroduced.Whichofthefollowing,iftrue,doesmosttoexplaintheapparentlysurprisingABecauseoftheneedtoeducatethepublicaboutitsnewmodels'capabilities,Denoma'sadvertisingspendingwashigherthannormalovertheperiod.BFortheperiodatissue,Denoma'smajorcompetitorsreporteddeclinesinrevenuethatwere,inpercentageterms,greaterthanDenoma's.CAsignificantproportionofDenoma'srevenuecomesfrommakingcomponentsforotherconsumer-electronicsmanufacturers.DUnlikesomeofitsmajorcompetitors,Denomahasnolinesofbusinessoutsideconsumerelectronicstoproviderevenuewhenretailsalesofconsumerelectronicsareweak.EDuringtheperiod,consumer-electronicsretailerssoldremainingunitsofDenoma'ssupersededmodelsatpricesthatweredeeplydiscountedfromthosemodels'originalprices.Adiethighinsaturatedfatsincreasesa 'sriskofdeveloheartdisease.Regularconsumptionofredwinereducesthatrisk.Per-capitaconsumptionofsaturatedfatsiscurrentlyaboutthesameinFranceasintheUnitedStates,butthereislessheartdiseasetherethanintheUnitedStatesbecauseconsumptionofredwineishigherinFrance.Thedifferenceinregularred-wineconsumptionhasbeennarrowing,butnosimilarconvergenceinheart-diseaserateshasoccurred.Whichofthefollowing,iftrue,mosthelpstoaccountforthelackofconvergencenotedabove?AConsumptionofsaturatedfatsisrelatedmorestronglytothegrowthoffattydepositsonarterywalls,whichreducebloodflowtotheheart,thanitistoheartdiseasedirectly.BOverthepast30years,per-capitaconsumptionofsaturatedfatshasremainedessentiallyunchangedintheUnitedStatesbuthasincreasedsomewhatinFrance.CReportsofthehealthbenefitsofredwinehaveledmanypeopleintheUnitedStatestodrinkredwineregularly.DCigarettesmoking,whichcsocontributetoheartdisease,isonlyslightlymorecommoninFrancethanintheUnitedStates.ERegularconsumptionofredwineisdecliningdramaticallyamongyoungadultsinFrance,andheartdiseasetypicallydoesnotmanifestitselfuntilmiddleage.Escalatingworldwidedemandforcornhasledtoasharpincreaseinthemarketpriceofcorn,andcornpricesarelikelytoremainhigh.Cornisextensiveusedasfeedforlivestock,andbecauseprofitmarginsaretightinthelivestockbusiness,manyfarmersareexpectedtoleavethebusiness.Withfewerrs,meatpriceswillsurelyrise.Nonetheless,observersexpectanimmediateshort-termdecreaseinmeatprices.Whichofthefollowing,iftrue,mosthelpstojustifytheobservers'ATheincreaseincornpricesisduemoretoadeclineinthesupplyofcornthantoagrowthindemandforit.BGenerally,farmerswhoaresqueezedoutofthelivestockbusinesssendtheirlivestocktomarketmuchearlierthantheyotherwisewould.CSomepeoplewhoatemeatregularlyinthepastareconvertingtodietsthatincludelittleornomeat.DAsmeatpricesrise,thenumberoflivestockproducersislikelytoriseELivestockproducerswhostayinthebusinesswillstartusingfeedotherthancornmoreextensivelythantheydidinthepast.Technologicalimprovementsandreduc