有几个理论可以用来解释公元前一万年大动物的灭绝

大动物的 导致了动物的。老师对该理论也持否定态度。大动物的几个解释对应原文第一段Byabout10000B.C.E.,allthosegiantcreatures,theMegfaunaofNorthAmericaweregone.Wedonotknowexactlywhathappenedtothem,buttherearesome正确答案分析错误答案分析确选项AAndthereisaClovissiteinavalleyinSouthernCaliforniawheretheremainsofthirteenmammothswerefound.Andspearpoints,toolsforprocessingmeat,andfireplaces.ThatwouldappeartobesomeprettycompellingC.最容易犯错的选项，注意逻辑关系，原文提到在这个地方发现猛犸象，是为了支持该理C本身错误。 正确选项C原文对应第三段SoIthinkitisquitelikelythatthose13mammothinSouthernCaliforniaalsodiedofnaturecauses,andthatClevispeoplesimplytookadvantageofthesituation.soI就是说，老师并不觉得是这些人的捕杀导致了大动物的，因此对应C选项。难点在于Cbeplishedat是这些人导致了动物的，正好相反。toolsforprocessingmeat,很多学生在听不懂的时候原文对应内容Ataroundof11500B.C.E.,theworldwascomingoutoftheiceage.Andwiththatcameincreasedseasonality,thatis,thesummersbecamewarmer,andthewintersactuallybecamecolder.Thisextremeshiftswouldhaveputalotofstressonthebodiesofanimalsthatwereusedtoamoremoderaterangeoftemperatures.Butthemostimportantimpactofthisincreasedseasonalitymayverywellhavebeenitseffectonthedistributionofplants.正确选项分析butthemost原文提到冰川时代结束之后季节性更强，夏天更热了，冬天更冷了。所以对应B。第二Cfood，同时在此段更具体的解释中提到冰川时代之后植物多样性减少，从而导致植物的。但是对于做对该题来说更具体的解释其实对于选C没有太大意义，只需要听到两个方面的并列的影响即可。A.D.新表明气候变化并不像科学家以前一度认为的那样那么和剧烈Again,wehavewhatatfirstseemslikeaprettyattractivetheory,butthen,howdoyouexplainthefactthatthishashappenedbefore?Youknow,globalcoolingfollowedbyglobalwarming,andtherewasnoextinction该句意思是之前气候变化也发生过，首先特别冷，之后全球变暖，但当时并没有发生动物的情况。也就是说大动物在之前的气候变化里生存下来了。所以对应B选项。该题考查老师对该理论的态度，考点角度也有明确的信号词，但是句子比较难听懂。Onethinghefoundwasthathumansdidnotnecessarilyhavetokilltheseanimalsingreatnumbersinordertonudgethemtowardtheextinction.That'sbecauseverylargeanimalshaveaslowrateofreproduction,soallyouhavetodoisremoveafewyoungfemalesfromtheherdsandyoucan,fairlyquickly,significantlyreducethepopulation.Andthenhecameupwithascenariothatcombinedsomehuntingbyhumanswithsomeenvironmentalstress,and...bang.Thesimulatedmammothwereextinctwithindecades.信号词：onething…；and物，因为他们的率比较低，只需要杀死一些雌性就可以了。