2019高考英语一轮基础自练题 Unit 2 Cloning（含解析）新人教版选修8

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1、Unit2Cloning***阅读理解。Spider(蜘蛛)webshavesomethinginmonwithguitarstrings.Thelong,thinstringsonaguitarcanvibrate(振动).Theymovebackandforth,orfromsidetoside.Sodowebsmadebyspiders.Thelinesofsilktheyproducecancarryvibrations.Thismovementgivesthesmallcreaturei

2、nformationaboutwhatlandedontheweb.Spidershaveeightlegsandusuallyeighteyes.Theanimalsbuildwebswiththeirownsoft,naturallymadesilk.Andmuchlikeplayingthestringsofaguitar,aspidercansendoutvibrationsacrossitswebovermanydifferentfrequencies(频率).Spiderscatcht

3、heirfood,usuallyinsectsintheirwebs.Theymakesmallmovements,whichspreadacrosstheirwebs.Thevibrationscangivethespiderdetailsaboutwhatiscaughtintheweb—maybeapossiblemate，orsomethingtastytoeat.Vibrationsarenotjustusedtospotwhatisfordinner.Theyarealsoimport

4、antincourtship(求爱),solotsofmaleswillactuallycreateaveryspecifickindofmusicalpatternwhichthefemalescanusetodeterminenotonlythatthey’reamale,butthey’retherightspecies,andwhethertheymightwanttomatewiththemaswell.Spidersmaketheirownvibrationstofindoutthec

5、onditionofthewebs.Bycontrollingthetightnessofthematerial,theycaneffectivelycontrolhowinformationisgettingtothemwhentheyhangoutinthemiddleoftheweb.Spidershaveaspecialabilitytoshapethephysicalnatureoftheirselfmadematerialsandcreations.Scientiststhinktha

6、tspidersilkmayhavechangedovertimeforthispurpose.【解题导语】　本文介绍了蜘蛛吐出的蛛丝可以传播不同频率的振动，这些振动让它们知道蜘蛛网上落下了什么东西并且这些振动在求爱中也非常重要。1．Howdoesaspiderfeelthataninsectiscaughtintheweb?A．Throughitssenseofsight.B．Throughvibrationsofitsweb.C．Throughdifferentfrequencies.D．Th

7、roughamusicalpattern.B　解析：细节理解题。根据第二段的“Thevibrationscangivethespiderdetailsaboutwhatiscaughtintheweb”可知，蜘蛛可以通过蛛网的振动知道有东西落到蛛网上了。故选B项。2．Whatdoestheunderlinedword“They”inParagraph2probablyreferto?A．Insects.B．Strings.C．Spiders.D．Vibrations.A　解析：代词指代题。根据第二

8、段的“Spiderscatchtheirfood...acrosstheirwebs.”可知，蜘蛛在它们的蛛网上捕食，一般捕到的都是昆虫。它们制造出传遍整张蛛网的小振动。所以They指代的是昆虫。3．WhichofthefollowingstatementsisTRUE?A．Silkproducesvibrationsasthestringsofaguitardo.B．Femalespidersmakespecialsoundstoattractapartner.C．Hunting