Theideaofbeingabletowalkonwaterhaslonginterestedhumansgreatly.Sadlybiologicalfactspreventuseveraccomplishingsuchathingwithoutartificialaid---wesimplyweightoomuchandallourmasspushesdownthroughourrela

　　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．Toturnthewaterintosolid.