2020版高考英语一轮复习Unit5Meetingyourancestors课时作业（含解析）新人教版选修8

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1、Unit5Meetingyourancestors课时作业Ⅰ.阅读理解(2018·山东省威海市二模)Bigcatshaveexistedontheearthformillionsofyears，thoughscientistsaren'tsureexactlyhowlong.Butanewstudyindicatesthataskull(颅骨)ofasnowleopard(豹)relativethatwasrecentlyunearthedis4.4millionyearsold.Thatmakesittheoldestbigcatfossil(化石)everfound.Atea

2、mofUSandChinesescientistsunearthedtheskullinTibet.Thiscreatureisnotadirectancestortobigcats，butitiscloselyrelatedtothesnowleopard，studyleaderJackTsengtoldtheAssociatedPress.ThefossillendsevidencetothebeliefthatbigcatsexistedinAsiaandspreadoutfromthere.Bigcatsareatthetopofthefoodchainandhavefe

3、wpredatorsoftheirown.Bigcatsincludesnowleopards，cloudedleopards，tigersandlions.Basedongeneticjudgements，mostscientistsbelievetheyfirstexistedinCentralAsia.Butpreviously，theoldestknownbigcatfossilwas3.6millionyearsoldandfoundinAfrica.ThenewfossilfindingswerepublishedintheNovember13issueofthesc

4、iencejournalProceedingsoftheRoyalSocietyB：BiologicalSciences.TsengandhisteamwerefossilhuntingintheHimalayasin2010whentheydiscoveredsomebones，includingtheburiedcatskull.Theresearcherswereabletodetermineitsagebystudyingthesurroundingrocksandsoil.Theskullindicatesthattheanimalwasaboutthesizeofac

5、loudedleopard，whichcangrowupto50pounds.In2012，theteamreturnedtounearthmorecatbones.DavidPollyfromIndianaUniversitytoldtheAssociatedPressthatthefossilis“convincinglyolderthanthe_current_record_holder”．HeaddedthattherecouldbeevenolderbigcatfossilsintheTibetanplateatouncover.【语篇解读】　本文讲述了最新考古发现——

6、一个大型猫科动物的颅骨化石。1．Whatdoesthenewlyunearthedskullprove?A．BigcatsmighthavetheiroriginsinAsia.B．Theoldestfossilis4.4millionyearsold.C．Thesnowleopardistheoldestbigcat.D．Theskullisofbigcats'directancestor.【答案】　A　推理判断题。由第二段最后一句话“ThefossillendsevidencetothebeliefthatbigcatsexistedinAsiaandspreadoutfro

7、mthere.”可推知，该化石使我们相信大型猫科动物起源于亚洲，然后繁衍到其他地方。2．WhatdoestheunderlinedwordinParagraph3mean?A．relatives.　　　　　　B．enemies.C．partners.D．protectors【答案】　B　猜测词义题。所在句意为“大型猫科动物位于食物链的顶端，所以几乎没有天敌”。3．Howdotheresearchersknowtheskull'sage?A．Bymeasuringitssizean