课堂新坐标2016_2017学年高中英语unit4exploringplanetsperiodⅳusinglanguage学业分层测评新人教版

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1、Unit4ExploringplanetsPeriodⅣUsingLanguageⅠ.单词拼写1．Whydidhumans(进化)towalkupright?2．I(附加)acopyofmynotesforyourinformation.3．SinceI'mhere，I'dliketotrya(有代表性的)dishofthiscountry.4．Thedyingfirewasthrowingouta(暗的)redlight.5．Don'tgraspatthe(脆弱的)branch，oryouma

2、ybreakit.6．Thewindowframeshave(腐烂)awaycompletely.7．Therearesome(甲虫)ontheplants.8．Theflowerhasseven(花瓣)．9．Theairwas(芬芳的，芳香的)withscentsfromtheseaandthehills.10．Themeatgivesoutanunpleasant(气味)．【答案】　1.evolve　2.attach　3.typical　4.dull　5.delicate　6.rotted　

3、7.beetles　8.petals9．fragrant　10.odourⅡ.阅读理解AHaveyoueverwonderedwhystems(茎)growupwardsandrootsdownwards?Whyplantsalwaysseemtoturntowardsthelightandclimbingplantsrunupratherthandown?Theanswerissimple:auxin(生长素)，achemicalsubstancethatcontrolsgrowthinpla

4、nts.AuxingivesawayitssecretsAuxinisaplanthormone(激素)．Darwinwasalreadyinterestedinitinthe19thcentury.Onlyinrecentyears，however，hasthehormonestartedtogiveawayitssecrets，thankstointensivemolecularresearch.Auxinisproducedintheyoung，growingpartsofplantsan

5、dthentransportedthroughouttheplant—toalowlyingstemforexample.Thestemneedstostraightenoutassoonaspossibletobeabletoabsorbthetopside，resultingintheundersidegrowingfasterandthestemstraighteningout.Forthesamereason，plantsinfrontofwindowswillalwaysturntot

6、helight.Thisactiveregulationofauxintransportallowsplantstotakeidealadvantageoflocalandchangingconditions.AnewmeansoftransportforauxinThetransportofauxinthroughtheplantplaysavitalrole.And，fromallappearances，itisnotasimplematter.Theresearchersidentifie

7、danimportantnewlinkandmeansoftransportforauxin:PILSproteins(蛋白质)．PILSproteinsarevitalforauxindependentplantgrowthandadjusttheintracellular(细胞内的)storageofthehormone.Itisexactlythiscompartmentalizing(分类)ofauxinthatseemsfunctionallyimportantforthevariou

8、sdevelopmentalprocesses.Growingcropsmoreefficiently:therightamountofauxinintherightplaceHigherauxinlevelsattherightmomentandintherightplaceresultinbettergrowthandgreaterharvest.Betteradjustmentofauxinlevelswouldmakeplantsgrowmoreefficiently.Theresear