Theideaofbeingabletowalkonwaterhaslonginterestedhumansgreatly.Sadlybiologicalfactspreventuseveraccomplishingsuchathingwithoutartificialaid---wesimplyweightoomuchandallourmasspushesdownthroughourrelat

　　Theideaofbeingabletowalkonwaterhaslonginterestedhumansgreatly.Sadlybiologicalfactspreventuseveraccomplishingsuchathingwithoutartificialaid---wesimplyweightoomuchandallourmasspushesdownthroughourrelativelysmallfeetresultinginalotofpressurethatmakesussink.

　　Howeverseveraltypesofanimalscanwalkonwater.OneofthemostinterestingisthecommonbasiliskBasilicusbasilicusalizard（蜥蜴）nativetoCentralandSouthAmerica.Itcanrunacrosswaterforadistanceofseveralmetersavoidinggettingwetbyrapidlyhittingthewater’ssurfacewithitsfeet.Thelizardwilltakeasmanyas20stepspersecondtokeepmovingforward.Forhumanstodothiswe’llneedhugefeetthatwecouldbringuptoourearsinordertocreateadequate“hitting.”

　　Butfortunatelythereisanalternative:cornflour.Byaddingenoughofthiscommonthickeningagenttowater(anditdoestakealot)youcancreatea“non-Newtonian”liquidthatdoesn’tbehavelikenormalwater.Nowifthesurfaceofthewaterishithardenoughparticles（粒子）inthewatergrouptogetherforamomenttomakethesurfacehard.Movequicklyenoughandputenoughforceintoeachstepandyoureallycanwalkacrossthesurfaceofanadequatelythickliquidofcornflour.

　　Funthoughallthismaysoundit’sstillrathermessyandbetterreadaboutintheorythancarriedoutinpractice.Ifyoumustdoitthenkeepthewaterwingshandyincaseyoustarttosink---andtakeashowerafterward!

　　【小题1】Walkingonwaterhasn’tbecomearealitymainlybecausehumans_______.

　　A．arenotinterestedinitB．havebiologicallimitationsC．havenotinventedpropertoolsD．areafraidtomakeanattempt【小题2】WhatdoweknowaboutBasilicusbasilicasfromthepassage?A．Itislightenoughtowalkonwater.B．Itshugefeetenableittostayabovewater.C．ItcanrunacrosswateratacertainspeedD．Itsuniqueskinkeepsitfromgettingwetinwater【小题3】Whatisthefunctionofthecornflouraccordingtothepassage?A．Tocreateathickliquid.B．Toturnthewaterintos